fix(rx): minor fixes and improvements

refactor(framing): re-name hamming codec to 7,4 to reflect algorithm used

awgn_harness.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+
+import asyncio
+from time import sleep
+import framing
+from header import Onbeat_Header
+
+PACKET_LEN=255*4 + 32
+DATA_LEN=223*4
+HEADER_LEN=32
+
+async def tcp_client(file_2_send: str, callsign: str, rs_coding: bool = True):
+    port = 50001
+    reader, writer = await asyncio.open_connection(
+        '127.0.0.1', port)
+    with open(file_2_send, "rb") as file_to_send:
+        seq = 0
+        sent: list[list[int]] = []
+        while message := file_to_send.read(DATA_LEN if rs_coding == True else (PACKET_LEN - HEADER_LEN)):
+            sent.append([i for i in message])
+            frame = bytes(framing.encode_packet([i for i in message], callsign, seq, rs_coding))
+            writer.write(frame)
+            seq += 1
+            sleep(0.1)
+        else:
+            frame = bytes(framing.encode_packet([], callsign, seq, rs_coding))
+            for _ in range(0,16):
+                writer.write(frame)
+                sleep(0.1)
+                sent.append([])
+
+
+        output: list[tuple[Onbeat_Header, list[int]]] = []
+        packet_loss = 0
+        while message := await reader.read(PACKET_LEN):
+            try:
+                received = framing.decode_packet([i for i in message])
+                output.append(received)
+                if received[0].pkt_len == 0:
+                    break
+            except Exception as e:
+                packet_loss += 1
+                print(e)
+
+        return sent, output
+
+
+rs_coding = False
+filename = "loremipsum"
+sent, output = asyncio.run(tcp_client(filename, "HA5PLS", rs_coding))
+output.sort(key=lambda packet: packet[0].pkt_sequence_id)
+output.pop()
+
+def hamming_dist(msg:int, got:int):
+    return bin(msg ^ got).count('1')
+
+total_errors = sum([sum([hamming_dist(msg, got) for msg, got in zip(sent[pkt[0].pkt_sequence_id], pkt[1])]) for pkt in output])
+rcv_len = sum([pkt[0].pkt_len for pkt in output]) * 8
+ber = total_errors/rcv_len
+print(f"Total errors: {total_errors}, BER: {ber}")
+
+
+
+# file : bytes = b''
+# filesize = 0
+# for pkt in output:
+#     payload = bytes(pkt[1])
+#     file += payload
+#     filesize += pkt[0].pkt_len
+# print(file.decode(errors="ignore"))
+
+# print(f"Lost {packet_loss} packets during the transfer, filesize: {filesize}")

framing.py

@@ -0,0 +1,46 @@
+from header import Onbeat_Header, PROTOCOL_IDENTIFIER
+from reedsolo import RSCodec
+import numpy as np
+
+PROTOCOL_V1_NOFEC = 1
+PROTOCOL_V1_FEC = 2
+RSC = RSCodec(255-223,255)
+
+def decode_packet(packet: list[int]) -> tuple[Onbeat_Header, list[int]]:
+    if len(packet) < 32:
+        raise OverflowError(f"Packet is too small to be valid, len: {len(packet)}")
+    header_raw = packet[0:32]
+    header = Onbeat_Header(0, 0, "", 0, 0)
+    if header.decode(header_raw) != True:
+        raise RuntimeError("invalid CRC")
+    if header.protocol_id != PROTOCOL_IDENTIFIER:
+        raise ValueError(f"Protocol ID mismatch, got{header.protocol_id}, expected {PROTOCOL_IDENTIFIER}")
+    if header.pkt_len > len(packet) - 32:
+        raise OverflowError(f"Header not fully captured, len:{header.pkt_len}, maximal: {len(packet) - 32}")
+    elif header.pkt_len == 0:
+        return header, []
+    payload = packet[32:32+header.pkt_len]
+    if header.protocol_configuration == PROTOCOL_V1_FEC:
+        payload_decoded = np.empty((4, min(len(payload)//4-32, 255)), dtype=int)
+        for i in range(0,4):
+            payload_decoded[i] = RSC.decode(bytearray(payload[i::4]))[0]
+        payload = payload_decoded.flatten(order='F').tolist()
+    elif header.protocol_configuration == PROTOCOL_V1_NOFEC:
+        pass
+    else:
+        raise ValueError(f"Unknown protocol configuration: {header.protocol_configuration}")
+    return header, payload
+
+def encode_packet(payload: list[int], callsign: str, sequence: int, rs_coding: bool = False) -> list[int]:
+    protocol_configuration = PROTOCOL_V1_NOFEC
+    if rs_coding == True:
+        protocol_configuration = PROTOCOL_V1_FEC
+        if len(payload) != 0:
+            for _ in range(0, len(payload)%4):
+                payload.append(0)
+            payload_encoded = np.empty((4, min((len(payload))//4+32, 255)), dtype=int)
+            for i in range(0,4):
+                payload_encoded[i] = RSC.encode(bytearray(payload[i::4]))
+            payload = payload_encoded.flatten(order='F').tolist()
+    header = Onbeat_Header(0, protocol_configuration, callsign, len(payload), sequence)
+    return header.encode() + payload

hamming_7_4_codec.py

@@ -0,0 +1,96 @@
+import numpy as np
+import numpy.typing as npt
+
+GEN_MATRIX = np.asarray([(1, 1, 1, 0, 0, 0, 0),
+                         (1, 0, 0, 1, 1, 0, 0),
+                         (0, 1, 0, 1, 0, 1, 0),
+                         (1, 1, 0, 1, 0, 0, 1),
+                         ])
+PARITY_MATRIX = np.asarray([(0, 0, 0, 1, 1, 1, 1),
+                            (0, 1, 1, 0, 0, 1, 1),
+                            (1, 0, 1, 0, 1, 0, 1),
+                            ])
+DECODER_MATRIX = np.asarray([(0, 0, 1, 0, 0, 0, 0,),
+                             (0, 0, 0, 0, 1, 0, 0,),
+                             (0, 0, 0, 0, 0, 1, 0,),
+                             (0, 0, 0, 0, 0, 0, 1,),
+                             ])
+
+
+def number_to_list(number: int, N: int) -> npt.NDArray:
+    """Return the last N bits of a number as an MSB-first array"""
+    return np.array([(number >> (N-1-i)) % 2 for i in range(0, N)],dtype=int)
+
+
+def list_to_number(array: npt.NDArray, N: int) -> int:
+    """Reconstruct a number from the first N elements of an MSB-first array"""
+    output = 0
+    for i in range(0, N):
+        output += array[i] << (N-1-i)
+    return output
+
+
+def encode_nibble(data: int) -> int:
+    """Encode the lower 4 bits of data as hamming(7,4)"""
+    data_asarr = number_to_list(data, 4)
+    output_asarr = (data_asarr @ GEN_MATRIX) % 2
+    return list_to_number(output_asarr, 7)
+
+
+def hamming_7_4_encode(data: list[int]) -> list[int]:
+    """Encode a list of ints using Hamming(7,4)
+       The returned list is twice as long as the list in the argument"""
+    data_encoded = []
+    for element in data:
+        data_encoded += [encode_nibble(element >> 4),
+                         encode_nibble(element % 16)]
+    return data_encoded
+
+
+def decode_nibble(data: int) -> int:
+    """decode a single nibble using the parity check matrix of Hamming(7,4).
+       This should correct 2 errors maximum."""
+    data_asarr = number_to_list(data, 7)
+    syndrome = (PARITY_MATRIX @ data_asarr) % 2
+    error = list_to_number(syndrome, 3)
+    if error == 0:
+        data_decoded = (DECODER_MATRIX @ data_asarr) % 2
+        return list_to_number(data_decoded, 4)
+    data_asarr[error - 1] ^= 1
+    data_decoded = (DECODER_MATRIX @ data_asarr) % 2
+    return list_to_number(data_decoded, 4)
+
+
+def hamming_7_4_decode(data: list[int]) -> list[int]:
+    """Decode a list of ints using Hamming(7,4)
+       The returned list is half as long as the list in the argument"""
+    return [(decode_nibble(data[i]) << 4) + (decode_nibble(data[i + 1])) for i in range(0, len(data), 2)]
+
+
+if __name__ == "__main__":
+    msg = 'TEST DE HA5PLS'
+    data_in = [byte for byte in bytearray(msg.encode())]
+    data_encoded = hamming_7_4_encode(data_in)
+    print(f"Data sent: {msg}")
+
+    data_corrupted_1bit = [data ^ (1 << (idx % 7))
+                           for idx, data in enumerate(data_encoded)]
+    # print(f"Corrupt data with 1-bit errors: {data_corrupted_1bit}")
+    data_corrected_1bit = hamming_7_4_decode(data_corrupted_1bit)
+    data_corrected_1bit_str = [int.to_bytes(int(i), 1, "big").decode(
+        encoding="utf-8", errors="ignore") for i in data_corrected_1bit]
+    print(f"Recovered data from 1-bit errors: {data_corrected_1bit_str}")
+
+    data_corrupted_2bit = [data ^ (5 << (idx % 7))
+                           for idx, data in enumerate(data_encoded)]
+    # print(f"Corrupt data with 2-bit errors: {data_corrupted_2bit}")
+    data_corrected_2bit = hamming_7_4_decode(data_corrupted_2bit)
+    data_corrected_2bit_str = [int.to_bytes(int(i), 1, "big").decode(
+        encoding="utf-8", errors="ignore") for i in data_corrected_2bit]
+    print(f"Recovered data from 2-bit errors: {data_corrected_2bit_str}")
+
+    # print(f"Corrupt data with 3-bit errors: {data_corrupted_3bit}")
+    data_corrected_noerr = hamming_7_4_decode(data_encoded)
+    data_corrected_noerr_str = [int.to_bytes(int(i), 1, "big").decode(
+        encoding="utf-8", errors="ignore") for i in data_corrected_noerr]
+    print(f"Recovered data from no errors: {data_corrected_noerr_str}")

header.py

@@ -0,0 +1,58 @@
+from hamming_7_4_codec import hamming_7_4_encode, hamming_7_4_decode
+from crc import Calculator, Crc16
+PROTOCOL_IDENTIFIER = 0x0
+# CRC_POLY = (0xed2f << 1) + 1 # from https://users.ece.cmu.edu/~koopman/crc/index.html as "best 16-bit CRC" on 2025-10-24
+ONBEAT_CRC = Calculator(Crc16.IBM_3740)
+
+
+class Onbeat_Header:
+    """This class represents a header for a single packet of ONBEAT."""
+
+    def __init__(self, protocol_id, protocol_configuration: int, callsign: str, pkt_len: int, pkt_sequence_id: int):
+        if protocol_id >= 2 << 4:
+            raise OverflowError(
+                f"protocol identifier should be confined to 4 bits, got {protocol_id}")
+        self.protocol_id = protocol_id
+
+        if protocol_configuration >= 2 << 4:
+            raise OverflowError(
+                f"protocol configuration should be confined to 4 bits, got {protocol_configuration}")
+        self.protocol_configuration = protocol_configuration
+
+        call_len = len(callsign.encode())
+        if call_len > 10:
+            raise OverflowError(
+                f"Callsign must be confined to 10 bytes, got {callsign} with length {call_len} (using UTF-8)")
+        for _ in range(call_len, 10):
+            callsign += "\0"
+        self.callsign = callsign
+
+        if pkt_len >= 2 << 16:
+            raise OverflowError(
+                f"Maximum allowed packet size is {2 << 16 - 1} got {pkt_len}")
+        self.pkt_len = pkt_len
+
+        if pkt_sequence_id >= 256:
+            raise OverflowError(
+                f"Packet sequence ID must be confined to 8 bits, got {pkt_sequence_id}")
+        self.pkt_sequence_id = pkt_sequence_id
+
+    def encode(self) -> list[int]:
+        header_asints = []
+        header_asints += [(PROTOCOL_IDENTIFIER << 4) +
+                          self.protocol_configuration]
+        header_asints += [ord(c) for c in self.callsign]
+        header_asints += [(self.pkt_len >> 8), self.pkt_len % 256]
+        header_asints += [self.pkt_sequence_id]
+        header_crc = ONBEAT_CRC.checksum(bytes(header_asints))
+        header_asints += [header_crc >> 8, header_crc % 256]
+        return hamming_7_4_encode(header_asints)
+
+    def decode(self, header_encoded: list[int]) -> bool:
+        header_corrected = hamming_7_4_decode(header_encoded)
+        self.protocol_id = int(header_corrected[0] >> 4)
+        self.protocol_configuration = int(header_corrected[0] % 16)
+        self.callsign = bytes(header_corrected[1:11]).decode(errors="ignore")
+        self.pkt_len = int((header_corrected[11] << 8) + header_corrected[12])
+        self.pkt_sequence_id = int(header_corrected[13])
+        return ONBEAT_CRC.verify(bytearray(header_corrected[0:14]), (header_corrected[14] << 8) + header_corrected[15])

hier_blocks/ONBEAT_demod.grc

@@ -0,0 +1,880 @@
+options:
+  parameters:
+    author: HA5PLS
+    catch_exceptions: 'True'
+    category: '[ONBEAT]'
+    cmake_opt: ''
+    comment: ''
+    copyright: GPL 3.0 or later
+    description: Hier block for demod of ONBEAT
+    gen_cmake: 'On'
+    gen_linking: dynamic
+    generate_options: hb
+    hier_block_src_path: '.:'
+    id: ONBEAT_Demod
+    max_nouts: '0'
+    output_language: python
+    placement: (0,0)
+    qt_qss_theme: ''
+    realtime_scheduling: ''
+    run: 'True'
+    run_command: '{python} -u {filename}'
+    run_options: prompt
+    sizing_mode: fixed
+    thread_safe_setters: ''
+    title: ONBEAT Demod
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: QPSK_MAP
+  id: variable_constellation_rect
+  parameters:
+    comment: ''
+    const_points: '[-1-1j, -1+1j, 1+1j, 1-1j]'
+    imag_sect: '2'
+    precision: '8'
+    real_sect: '2'
+    rot_sym: '4'
+    soft_dec_lut: None
+    sym_map: symbol_map
+    w_imag_sect: '1'
+    w_real_sect: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [192, 12.0]
+    rotation: 0
+    state: enabled
+- name: FULL_PACKET_LEN
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: '4096'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [664, 8.0]
+    rotation: 0
+    state: enabled
+- name: OVERSAMPLING
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: intx
+    value: '10'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [448, 8.0]
+    rotation: 0
+    state: enabled
+- name: RRC_ALPHA
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: '0.35'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [568, 8.0]
+    rotation: 0
+    state: enabled
+- name: analog_agc_xx_0
+  id: analog_agc_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    gain: '1.0'
+    max_gain: '65536'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    rate: 1e-4
+    reference: '1.0'
+    type: complex
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [152, 232.0]
+    rotation: 0
+    state: enabled
+- name: blocks_multiply_const_xx_0
+  id: blocks_multiply_const_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    const: 1j
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [48, 592.0]
+    rotation: 0
+    state: enabled
+- name: blocks_multiply_const_xx_0_0
+  id: blocks_multiply_const_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    const: '-1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [48, 680.0]
+    rotation: 0
+    state: enabled
+- name: blocks_multiply_const_xx_0_1
+  id: blocks_multiply_const_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    const: -1j
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [48, 768.0]
+    rotation: 0
+    state: enabled
+- name: blocks_repack_bits_bb_0_0_0
+  id: blocks_repack_bits_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    align_output: 'False'
+    comment: ''
+    endianness: gr.GR_MSB_FIRST
+    k: '2'
+    l: '1'
+    len_tag_key: '""'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 584.0]
+    rotation: 0
+    state: enabled
+- name: blocks_repack_bits_bb_0_1_0
+  id: blocks_repack_bits_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    align_output: 'False'
+    comment: ''
+    endianness: gr.GR_MSB_FIRST
+    k: '2'
+    l: '1'
+    len_tag_key: '""'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 672.0]
+    rotation: 0
+    state: enabled
+- name: blocks_repack_bits_bb_0_2_0
+  id: blocks_repack_bits_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    align_output: 'False'
+    comment: ''
+    endianness: gr.GR_MSB_FIRST
+    k: '2'
+    l: '1'
+    len_tag_key: '""'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 760.0]
+    rotation: 0
+    state: enabled
+- name: blocks_repack_bits_bb_0_3
+  id: blocks_repack_bits_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    align_output: 'False'
+    comment: ''
+    endianness: gr.GR_MSB_FIRST
+    k: '2'
+    l: '1'
+    len_tag_key: '""'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 496.0]
+    rotation: 0
+    state: enabled
+- name: blocks_tag_debug_0
+  id: blocks_tag_debug
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    display: 'True'
+    filter: '""'
+    name: ''
+    num_inputs: '4'
+    type: byte
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1064.0, 896]
+    rotation: 270
+    state: disabled
+- name: digital_constellation_decoder_cb_0
+  id: digital_constellation_decoder_cb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    constellation: QPSK_MAP
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [240, 504.0]
+    rotation: 0
+    state: enabled
+- name: digital_constellation_decoder_cb_0_0
+  id: digital_constellation_decoder_cb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    constellation: QPSK_MAP
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [240, 592.0]
+    rotation: 0
+    state: enabled
+- name: digital_constellation_decoder_cb_0_1
+  id: digital_constellation_decoder_cb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    constellation: QPSK_MAP
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [240, 680.0]
+    rotation: 0
+    state: enabled
+- name: digital_constellation_decoder_cb_0_2
+  id: digital_constellation_decoder_cb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    constellation: QPSK_MAP
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [240, 768.0]
+    rotation: 0
+    state: enabled
+- name: digital_correlate_access_code_tag_xx_0
+  id: digital_correlate_access_code_tag_xx
+  parameters:
+    access_code: syncword
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    tagname: '"syncword_found"'
+    threshold: int(len(syncword)*(1-roc_tolerance))
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [832, 488.0]
+    rotation: 0
+    state: enabled
+- name: digital_correlate_access_code_tag_xx_0_0
+  id: digital_correlate_access_code_tag_xx
+  parameters:
+    access_code: syncword
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    tagname: '"syncword_found"'
+    threshold: int(len(syncword)*(1-roc_tolerance))
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [832, 576.0]
+    rotation: 0
+    state: enabled
+- name: digital_correlate_access_code_tag_xx_0_1
+  id: digital_correlate_access_code_tag_xx
+  parameters:
+    access_code: syncword
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    tagname: '"syncword_found"'
+    threshold: int(len(syncword)*(1-roc_tolerance))
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [832, 664.0]
+    rotation: 0
+    state: enabled
+- name: digital_correlate_access_code_tag_xx_0_2
+  id: digital_correlate_access_code_tag_xx
+  parameters:
+    access_code: syncword
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    tagname: '"syncword_found"'
+    threshold: int(len(syncword)*(1-roc_tolerance))
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [832, 752.0]
+    rotation: 0
+    state: enabled
+- name: digital_costas_loop_cc_0
+  id: digital_costas_loop_cc
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    order: '4'
+    use_snr: 'False'
+    w: '0.045'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1008, 184.0]
+    rotation: 0
+    state: enabled
+- name: digital_map_bb_0
+  id: digital_map_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    map: symbol_map
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [464, 504.0]
+    rotation: 0
+    state: enabled
+- name: digital_map_bb_0_0
+  id: digital_map_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    map: symbol_map
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [464, 592.0]
+    rotation: 0
+    state: enabled
+- name: digital_map_bb_0_1
+  id: digital_map_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    map: symbol_map
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [464, 680.0]
+    rotation: 0
+    state: enabled
+- name: digital_map_bb_0_2
+  id: digital_map_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    map: symbol_map
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [464, 768.0]
+    rotation: 0
+    state: enabled
+- name: digital_symbol_sync_xx_0
+  id: digital_symbol_sync_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    constellation: digital.constellation_bpsk().base()
+    damping: '1.0'
+    loop_bw: '0.045'
+    max_dev: '1.5'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    nfilters: '64'
+    osps: '1'
+    pfb_mf_taps: '[]'
+    resamp_type: digital.IR_MMSE_8TAP
+    sps: '2'
+    ted_gain: '1.0'
+    ted_type: digital.TED_GARDNER
+    type: cc
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 196.0]
+    rotation: 0
+    state: enabled
+- name: filter_fft_rrc_filter_0
+  id: filter_fft_rrc_filter
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha: RRC_ALPHA
+    comment: ''
+    decim: OVERSAMPLING//2
+    gain: '1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    ntaps: 11*OVERSAMPLING
+    nthreads: '1'
+    samp_rate: samp_rate
+    sym_rate: samp_rate/OVERSAMPLING
+    type: ccc
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [352, 204.0]
+    rotation: 0
+    state: enabled
+- name: pad_sink_0
+  id: pad_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: freq_sync_out
+    num_streams: '1'
+    optional: 'True'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1216.0, 344]
+    rotation: 270
+    state: enabled
+- name: pad_sink_1
+  id: pad_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: symbol_sync_out
+    num_streams: '1'
+    optional: 'True'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [928.0, 336]
+    rotation: 270
+    state: enabled
+- name: pad_sink_2
+  id: pad_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: RRC_out
+    num_streams: '1'
+    optional: 'True'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [560.0, 376]
+    rotation: 270
+    state: enabled
+- name: pad_sink_3
+  id: pad_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: agc_out
+    num_streams: '1'
+    optional: 'True'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [296.0, 376]
+    rotation: 270
+    state: disabled
+- name: pad_sink_4
+  id: pad_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: out
+    num_streams: '1'
+    optional: 'False'
+    type: message
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1528, 632.0]
+    rotation: 0
+    state: enabled
+- name: pad_source_0
+  id: pad_source
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: in
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_streams: '1'
+    optional: 'False'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 256.0]
+    rotation: 0
+    state: enabled
+- name: roc_tolerance
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1000, 8.0]
+    rotation: 0
+    state: enabled
+- name: samp_rate
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: 1e6
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [352, 8.0]
+    rotation: 0
+    state: enabled
+- name: satellites_fixedlen_to_pdu_0
+  id: satellites_fixedlen_to_pdu
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    pack: 'True'
+    packet_len: FULL_PACKET_LEN
+    syncword_tag: '"syncword_found"'
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1208, 488.0]
+    rotation: 0
+    state: enabled
+- name: satellites_fixedlen_to_pdu_0_0
+  id: satellites_fixedlen_to_pdu
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    pack: 'True'
+    packet_len: FULL_PACKET_LEN
+    syncword_tag: '"syncword_found"'
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1208, 576.0]
+    rotation: 0
+    state: enabled
+- name: satellites_fixedlen_to_pdu_0_1
+  id: satellites_fixedlen_to_pdu
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    pack: 'True'
+    packet_len: FULL_PACKET_LEN
+    syncword_tag: '"syncword_found"'
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1208, 664.0]
+    rotation: 0
+    state: enabled
+- name: satellites_fixedlen_to_pdu_0_2
+  id: satellites_fixedlen_to_pdu
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    pack: 'True'
+    packet_len: FULL_PACKET_LEN
+    syncword_tag: '"syncword_found"'
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1208, 752.0]
+    rotation: 0
+    state: enabled
+- name: symbol_map
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: ''
+    value: '[0, 1, 3, 2]'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [352, 96.0]
+    rotation: 0
+    state: enabled
+- name: syncword
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: ''
+    value: '"0000011100001001000110110010110101110111100110001010100111111010"'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [824, 8.0]
+    rotation: 0
+    state: enabled
+- name: virtual_sink_0
+  id: virtual_sink
+  parameters:
+    alias: ''
+    comment: ''
+    stream_id: freq_sync_signal
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1304, 176.0]
+    rotation: 0
+    state: enabled
+- name: virtual_source_0
+  id: virtual_source
+  parameters:
+    alias: ''
+    comment: ''
+    stream_id: freq_sync_signal
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 504.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [analog_agc_xx_0, '0', filter_fft_rrc_filter_0, '0']
+- [analog_agc_xx_0, '0', pad_sink_3, '0']
+- [blocks_multiply_const_xx_0, '0', digital_constellation_decoder_cb_0_0, '0']
+- [blocks_multiply_const_xx_0_0, '0', digital_constellation_decoder_cb_0_1, '0']
+- [blocks_multiply_const_xx_0_1, '0', digital_constellation_decoder_cb_0_2, '0']
+- [blocks_repack_bits_bb_0_0_0, '0', digital_correlate_access_code_tag_xx_0_0, '0']
+- [blocks_repack_bits_bb_0_1_0, '0', digital_correlate_access_code_tag_xx_0_1, '0']
+- [blocks_repack_bits_bb_0_2_0, '0', digital_correlate_access_code_tag_xx_0_2, '0']
+- [blocks_repack_bits_bb_0_3, '0', digital_correlate_access_code_tag_xx_0, '0']
+- [digital_constellation_decoder_cb_0, '0', digital_map_bb_0, '0']
+- [digital_constellation_decoder_cb_0_0, '0', digital_map_bb_0_0, '0']
+- [digital_constellation_decoder_cb_0_1, '0', digital_map_bb_0_1, '0']
+- [digital_constellation_decoder_cb_0_2, '0', digital_map_bb_0_2, '0']
+- [digital_correlate_access_code_tag_xx_0, '0', blocks_tag_debug_0, '3']
+- [digital_correlate_access_code_tag_xx_0, '0', satellites_fixedlen_to_pdu_0, '0']
+- [digital_correlate_access_code_tag_xx_0_0, '0', blocks_tag_debug_0, '2']
+- [digital_correlate_access_code_tag_xx_0_0, '0', satellites_fixedlen_to_pdu_0_0,
+  '0']
+- [digital_correlate_access_code_tag_xx_0_1, '0', blocks_tag_debug_0, '1']
+- [digital_correlate_access_code_tag_xx_0_1, '0', satellites_fixedlen_to_pdu_0_1,
+  '0']
+- [digital_correlate_access_code_tag_xx_0_2, '0', blocks_tag_debug_0, '0']
+- [digital_correlate_access_code_tag_xx_0_2, '0', satellites_fixedlen_to_pdu_0_2,
+  '0']
+- [digital_costas_loop_cc_0, '0', pad_sink_0, '0']
+- [digital_costas_loop_cc_0, '0', virtual_sink_0, '0']
+- [digital_map_bb_0, '0', blocks_repack_bits_bb_0_3, '0']
+- [digital_map_bb_0_0, '0', blocks_repack_bits_bb_0_0_0, '0']
+- [digital_map_bb_0_1, '0', blocks_repack_bits_bb_0_1_0, '0']
+- [digital_map_bb_0_2, '0', blocks_repack_bits_bb_0_2_0, '0']
+- [digital_symbol_sync_xx_0, '0', digital_costas_loop_cc_0, '0']
+- [digital_symbol_sync_xx_0, '0', pad_sink_1, '0']
+- [filter_fft_rrc_filter_0, '0', digital_symbol_sync_xx_0, '0']
+- [filter_fft_rrc_filter_0, '0', pad_sink_2, '0']
+- [pad_source_0, '0', analog_agc_xx_0, '0']
+- [satellites_fixedlen_to_pdu_0, pdus, pad_sink_4, in]
+- [satellites_fixedlen_to_pdu_0_0, pdus, pad_sink_4, in]
+- [satellites_fixedlen_to_pdu_0_1, pdus, pad_sink_4, in]
+- [satellites_fixedlen_to_pdu_0_2, pdus, pad_sink_4, in]
+- [virtual_source_0, '0', blocks_multiply_const_xx_0, '0']
+- [virtual_source_0, '0', blocks_multiply_const_xx_0_0, '0']
+- [virtual_source_0, '0', blocks_multiply_const_xx_0_1, '0']
+- [virtual_source_0, '0', digital_constellation_decoder_cb_0, '0']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.11.0

hier_blocks/ONBEAT_mod.grc

@@ -0,0 +1,361 @@
+options:
+  parameters:
+    author: HA5PLS
+    catch_exceptions: 'True'
+    category: '[ONBEAT]'
+    cmake_opt: ''
+    comment: ''
+    copyright: GPL 3.0 or later
+    description: Hier block for modulation of ONBEAT
+    gen_cmake: 'On'
+    gen_linking: dynamic
+    generate_options: hb
+    hier_block_src_path: '.:'
+    id: ONBEAT_Mod
+    max_nouts: '0'
+    output_language: python
+    placement: (0,0)
+    qt_qss_theme: ''
+    realtime_scheduling: ''
+    run: 'True'
+    run_command: '{python} -u {filename}'
+    run_options: prompt
+    sizing_mode: fixed
+    thread_safe_setters: ''
+    title: ONBEAT Mod
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: QPSK_MAP
+  id: variable_constellation_rect
+  parameters:
+    comment: ''
+    const_points: '[-1-1j, -1+1j, 1+1j, 1-1j]'
+    imag_sect: '2'
+    precision: '8'
+    real_sect: '2'
+    rot_sym: '4'
+    soft_dec_lut: None
+    sym_map: '[0, 1, 3, 2]'
+    w_imag_sect: '1'
+    w_real_sect: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1104, 20.0]
+    rotation: 0
+    state: enabled
+- name: preamble_len
+  id: variable_tag_object
+  parameters:
+    comment: ''
+    key: pmt.intern("packet_len")
+    offset: '0'
+    src: pmt.intern("src")
+    value: pmt.from_long(len(preamble))
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 184.0]
+    rotation: 0
+    state: enabled
+- name: syncword_len
+  id: variable_tag_object
+  parameters:
+    comment: ''
+    key: pmt.intern("packet_len")
+    offset: '0'
+    src: pmt.intern("src")
+    value: pmt.from_long((len(syncword)+7)//8)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 304.0]
+    rotation: 0
+    state: enabled
+- name: trailer_len
+  id: variable_tag_object
+  parameters:
+    comment: ''
+    key: pmt.intern("packet_len")
+    offset: '0'
+    src: pmt.intern("src")
+    value: pmt.from_long(8)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [168, 504.0]
+    rotation: 0
+    state: disabled
+- name: OVERSAMPLING
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: intx
+    value: '10'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [248, 8.0]
+    rotation: 0
+    state: enabled
+- name: RRC_ALPHA
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: '0.35'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [368, 8.0]
+    rotation: 0
+    state: enabled
+- name: blocks_repack_bits_bb_1_0
+  id: blocks_repack_bits_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    align_output: 'False'
+    comment: ''
+    endianness: gr.GR_MSB_FIRST
+    k: '1'
+    l: '8'
+    len_tag_key: '""'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [352, 312.0]
+    rotation: 0
+    state: enabled
+- name: blocks_repack_bits_bb_1_0_0
+  id: blocks_repack_bits_bb
+  parameters:
+    affinity: ''
+    alias: ''
+    align_output: 'False'
+    comment: ''
+    endianness: gr.GR_MSB_FIRST
+    k: '1'
+    l: '8'
+    len_tag_key: '""'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [456, 512.0]
+    rotation: 0
+    state: disabled
+- name: blocks_tagged_stream_mux_0
+  id: blocks_tagged_stream_mux
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    lengthtagname: packet_len
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    ninputs: '3'
+    tag_preserve_head_pos: '0'
+    type: byte
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [848, 296.0]
+    rotation: 0
+    state: enabled
+- name: blocks_vector_source_x_0_0
+  id: blocks_vector_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    repeat: 'True'
+    tags: '[preamble_len]'
+    type: byte
+    vector: preamble
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [168, 216.0]
+    rotation: 0
+    state: enabled
+- name: blocks_vector_source_x_0_0_0
+  id: blocks_vector_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    repeat: 'True'
+    tags: '[syncword_len]'
+    type: byte
+    vector: '[int(i) for i in syncword]'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [168, 304.0]
+    rotation: 0
+    state: enabled
+- name: blocks_vector_source_x_0_0_0_0
+  id: blocks_vector_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    repeat: 'True'
+    tags: '[trailer_len]'
+    type: byte
+    vector: preamble
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [272, 504.0]
+    rotation: 0
+    state: disabled
+- name: digital_constellation_modulator_0
+  id: digital_constellation_modulator
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    constellation: QPSK_MAP
+    differential: 'False'
+    excess_bw: RRC_ALPHA
+    log: 'False'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samples_per_symbol: OVERSAMPLING
+    truncate: 'False'
+    verbose: 'False'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1096, 312.0]
+    rotation: 0
+    state: enabled
+- name: pad_sink_0
+  id: pad_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: out
+    num_streams: '1'
+    optional: 'False'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1352, 336.0]
+    rotation: 0
+    state: enabled
+- name: pad_source_0
+  id: pad_source
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    label: in
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_streams: '1'
+    optional: 'False'
+    type: byte
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [288, 416.0]
+    rotation: 0
+    state: enabled
+- name: preamble
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: ''
+    value: '[0x33 for i in range(0, 128*2, 8)]'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [808, 24.0]
+    rotation: 0
+    state: enabled
+- name: syncword
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: ''
+    value: '"0000011100001001000110110010110101110111100110001010100111111010"'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [608, 24.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [blocks_repack_bits_bb_1_0, '0', blocks_tagged_stream_mux_0, '1']
+- [blocks_tagged_stream_mux_0, '0', digital_constellation_modulator_0, '0']
+- [blocks_vector_source_x_0_0, '0', blocks_tagged_stream_mux_0, '0']
+- [blocks_vector_source_x_0_0_0, '0', blocks_repack_bits_bb_1_0, '0']
+- [blocks_vector_source_x_0_0_0_0, '0', blocks_repack_bits_bb_1_0_0, '0']
+- [digital_constellation_modulator_0, '0', pad_sink_0, '0']
+- [pad_source_0, '0', blocks_tagged_stream_mux_0, '2']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.11.0

loremipsum

@@ -0,0 +1,9 @@
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque scelerisque nunc ac mi rhoncus, in commodo elit euismod. Suspendisse eu tempor dolor, in convallis tortor. Quisque semper nec augue sed sollicitudin. Sed at justo neque. Suspendisse dolor dolor, interdum ultricies commodo sollicitudin, congue sed massa. Sed ut tellus in felis feugiat ornare. Nunc in fringilla nisi. Ut eget fermentum massa. Nam nec ex a enim vestibulum commodo ut nec urna. Fusce id iaculis lectus. Integer aliquet quis est sit amet posuere.
+
+Nulla vitae facilisis ex. Etiam mi ipsum, tristique nec convallis vitae, molestie vel massa. Aliquam erat volutpat. Vivamus molestie lorem nibh, lacinia efficitur magna elementum ac. Morbi ut lectus a mauris sodales ultricies eu vel nisl. Phasellus eget dui ac ante tristique tristique. Suspendisse nisi orci, vestibulum in leo ac, mollis ultricies mi. Donec bibendum, justo quis consequat ultrices, quam est lobortis orci, ut laoreet nibh ligula non felis. Mauris dignissim, odio ac luctus interdum, dolor massa pretium elit, vitae ullamcorper justo orci nec mi. Nunc pharetra et tortor id fringilla. Sed ac gravida diam, quis rutrum dolor. Curabitur sit amet enim nec libero pulvinar dictum. Cras sodales orci et tellus volutpat, eget malesuada odio commodo.
+
+Curabitur varius ultricies metus nec laoreet. Fusce commodo felis et eros volutpat iaculis. Suspendisse potenti. Etiam augue nibh, consequat at malesuada ac, interdum vel dolor. Morbi nec urna tincidunt, varius eros sed, sagittis odio. Quisque auctor nibh diam, ut feugiat urna fermentum a. Aenean sit amet lectus vehicula, iaculis purus in, suscipit ante. Vestibulum vitae euismod urna. Nam id aliquam lorem. Nullam aliquet leo sit amet mi imperdiet congue. Sed luctus urna erat, sed finibus nisl tincidunt sed. Integer at tortor quam. Praesent id imperdiet lorem.
+
+Aenean feugiat tempus lorem ac gravida. Praesent quis dolor at risus sodales porttitor a ut tellus. Aenean varius ex in lorem pulvinar, pulvinar mattis elit rhoncus. Interdum et malesuada fames ac ante ipsum primis in faucibus. Sed varius elit sed justo mattis varius. Curabitur a enim mi. Mauris nec est congue tortor sollicitudin convallis. Donec vestibulum diam risus, quis imperdiet massa consectetur non. Curabitur vel nunc est. Vestibulum convallis ipsum vel diam eleifend, nec gravida arcu auctor. Nam id libero tellus. Etiam at vehicula elit, imperdiet sollicitudin ligula. In hac habitasse platea dictumst. Phasellus lorem ex, efficitur in sem sit amet, fringilla dictum purus. Duis porta pharetra faucibus. Duis turpis tellus, condimentum id fringilla sed, fringilla sed mi.
+
+Etiam et metus id elit varius faucibus non id justo. Aliquam interdum elit id massa egestas cursus quis sed magna. Sed gravida pellentesque ornare. Integer at pharetra tortor. Nam sit amet velit eu ligula fringilla mattis eu vel tortor. Nunc in ipsum tellus. Vivamus efficitur neque non purus faucibus, nec congue libero consequat. 

onbeat_rx.grc

@@ -0,0 +1,962 @@
+options:
+  parameters:
+    author: HA5PLS
+    catch_exceptions: 'True'
+    category: '[GRC Hier Blocks]'
+    cmake_opt: ''
+    comment: ''
+    copyright: GPL 3.0 or later
+    description: Receiver flowgraph for onbeat
+    gen_cmake: 'On'
+    gen_linking: dynamic
+    generate_options: qt_gui
+    hier_block_src_path: '.:'
+    id: onbeat_rx
+    max_nouts: '0'
+    output_language: python
+    placement: (0,0)
+    qt_qss_theme: ''
+    realtime_scheduling: ''
+    run: 'True'
+    run_command: '{python} -u {filename}'
+    run_options: prompt
+    sizing_mode: fixed
+    thread_safe_setters: ''
+    title: ONBEAT receiver
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: OVERSAMPLING
+  id: variable
+  parameters:
+    comment: ''
+    value: '100'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [288, 12.0]
+    rotation: 0
+    state: enabled
+- name: RRC_ALPHA
+  id: variable
+  parameters:
+    comment: ''
+    value: '0.35'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [816, 12.0]
+    rotation: 0
+    state: enabled
+- name: lo_freq
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: RX frequency
+    min_len: '200'
+    orient: QtCore.Qt.Horizontal
+    rangeType: int
+    start: '50'
+    step: '1'
+    stop: '3000'
+    value: '433'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [192, 96.0]
+    rotation: 0
+    state: true
+- name: rx_gain
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: RX gain
+    min_len: '200'
+    orient: QtCore.Qt.Horizontal
+    rangeType: float
+    start: '0'
+    step: '0.1'
+    stop: '49.6'
+    value: '20'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [160, 256.0]
+    rotation: 0
+    state: true
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: 1e6
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [192, 12.0]
+    rotation: 0
+    state: enabled
+- name: symbol_map
+  id: variable
+  parameters:
+    comment: ''
+    value: '[0, 1, 3, 2]'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [712, 12.0]
+    rotation: 0
+    state: enabled
+- name: ONBEAT_Demod_1
+  id: ONBEAT_Demod
+  parameters:
+    FULL_PACKET_LEN: 8*(4*255+2*16)
+    OVERSAMPLING: OVERSAMPLING
+    RRC_ALPHA: RRC_ALPHA
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    roc_tolerance: '0.8'
+    samp_rate: samp_rate
+    symbol_map: symbol_map
+    syncword: syncword
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [728, 412.0]
+    rotation: 0
+    state: enabled
+- name: network_socket_pdu_1
+  id: network_socket_pdu
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    host: 0.0.0.0
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    mtu: '10000'
+    port: rx_port
+    tcp_no_delay: 'False'
+    type: TCP_SERVER
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1104, 572.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_const_sink_x_0
+  id: qtgui_const_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    axislabels: 'True'
+    color1: '"blue"'
+    color10: '"red"'
+    color2: '"red"'
+    color3: '"green"'
+    color4: '"black"'
+    color5: '"cyan"'
+    color6: '"magenta"'
+    color7: '"yellow"'
+    color8: '"dark red"'
+    color9: '"dark green"'
+    comment: ''
+    grid: 'False'
+    gui_hint: ''
+    label1: ''
+    label10: ''
+    label2: ''
+    label3: ''
+    label4: ''
+    label5: ''
+    label6: ''
+    label7: ''
+    label8: ''
+    label9: ''
+    legend: 'True'
+    marker1: '0'
+    marker10: '0'
+    marker2: '0'
+    marker3: '0'
+    marker4: '0'
+    marker5: '0'
+    marker6: '0'
+    marker7: '0'
+    marker8: '0'
+    marker9: '0'
+    name: '""'
+    nconnections: '1'
+    size: '128'
+    style1: '0'
+    style10: '0'
+    style2: '0'
+    style3: '0'
+    style4: '0'
+    style5: '0'
+    style6: '0'
+    style7: '0'
+    style8: '0'
+    style9: '0'
+    tr_chan: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_slope: qtgui.TRIG_SLOPE_POS
+    tr_tag: '""'
+    type: complex
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    xmax: '2'
+    xmin: '-2'
+    ymax: '2'
+    ymin: '-2'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1104, 316.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_eye_sink_x_0
+  id: qtgui_eye_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    axislabels: 'True'
+    color1: blue
+    color10: blue
+    color2: blue
+    color3: blue
+    color4: blue
+    color5: blue
+    color6: blue
+    color7: blue
+    color8: blue
+    color9: blue
+    comment: ''
+    ctrlpanel: 'False'
+    entags: 'True'
+    grid: 'False'
+    gui_hint: ''
+    label1: Signal 1
+    label10: Signal 10
+    label2: Signal 2
+    label3: Signal 3
+    label4: Signal 4
+    label5: Signal 5
+    label6: Signal 6
+    label7: Signal 7
+    label8: Signal 8
+    label9: Signal 9
+    legend: 'True'
+    marker1: '-1'
+    marker10: '-1'
+    marker2: '-1'
+    marker3: '-1'
+    marker4: '-1'
+    marker5: '-1'
+    marker6: '-1'
+    marker7: '-1'
+    marker8: '-1'
+    marker9: '-1'
+    nconnections: '1'
+    samp_per_symbol: '1'
+    size: '128'
+    srate: samp_rate
+    style1: '1'
+    style10: '1'
+    style2: '1'
+    style3: '1'
+    style4: '1'
+    style5: '1'
+    style6: '1'
+    style7: '1'
+    style8: '1'
+    style9: '1'
+    tr_chan: '0'
+    tr_delay: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_slope: qtgui.TRIG_SLOPE_POS
+    tr_tag: '""'
+    type: complex
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    ylabel: Amplitude
+    ymax: '1'
+    ymin: '-1'
+    yunit: '""'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1104, 380.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_freq_sink_x_0
+  id: qtgui_freq_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    average: '1.0'
+    axislabels: 'True'
+    bw: samp_rate
+    color1: '"blue"'
+    color10: '"dark blue"'
+    color2: '"red"'
+    color3: '"green"'
+    color4: '"black"'
+    color5: '"cyan"'
+    color6: '"magenta"'
+    color7: '"yellow"'
+    color8: '"dark red"'
+    color9: '"dark green"'
+    comment: ''
+    ctrlpanel: 'False'
+    fc: lo_freq*10e6
+    fftsize: '1024'
+    freqhalf: 'True'
+    grid: 'False'
+    gui_hint: ''
+    label: Relative Gain
+    label1: ''
+    label10: ''''''
+    label2: ''''''
+    label3: ''''''
+    label4: ''''''
+    label5: ''''''
+    label6: ''''''
+    label7: ''''''
+    label8: ''''''
+    label9: ''''''
+    legend: 'True'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    name: '""'
+    nconnections: '1'
+    norm_window: 'False'
+    showports: 'False'
+    tr_chan: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_tag: '""'
+    type: complex
+    units: dB
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    wintype: window.WIN_BLACKMAN_hARRIS
+    ymax: '10'
+    ymin: '-140'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [776, 224.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_time_sink_x_0
+  id: qtgui_time_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    axislabels: 'True'
+    color1: blue
+    color10: dark blue
+    color2: red
+    color3: green
+    color4: black
+    color5: cyan
+    color6: magenta
+    color7: yellow
+    color8: dark red
+    color9: dark green
+    comment: ''
+    ctrlpanel: 'False'
+    entags: 'True'
+    grid: 'False'
+    gui_hint: ''
+    label1: Signal 1
+    label10: Signal 10
+    label2: Signal 2
+    label3: Signal 3
+    label4: Signal 4
+    label5: Signal 5
+    label6: Signal 6
+    label7: Signal 7
+    label8: Signal 8
+    label9: Signal 9
+    legend: 'True'
+    marker1: '-1'
+    marker10: '-1'
+    marker2: '-1'
+    marker3: '-1'
+    marker4: '-1'
+    marker5: '-1'
+    marker6: '-1'
+    marker7: '-1'
+    marker8: '-1'
+    marker9: '-1'
+    name: '""'
+    nconnections: '1'
+    size: '1024'
+    srate: samp_rate/5
+    stemplot: 'False'
+    style1: '1'
+    style10: '1'
+    style2: '1'
+    style3: '1'
+    style4: '1'
+    style5: '1'
+    style6: '1'
+    style7: '1'
+    style8: '1'
+    style9: '1'
+    tr_chan: '0'
+    tr_delay: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_slope: qtgui.TRIG_SLOPE_POS
+    tr_tag: '""'
+    type: complex
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    ylabel: Amplitude
+    ymax: '1'
+    ymin: '-1'
+    yunit: '""'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1104, 484.0]
+    rotation: 0
+    state: enabled
+- name: rtlsdr_source_0
+  id: rtlsdr_source
+  parameters:
+    affinity: ''
+    alias: ''
+    ant0: ''
+    ant1: ''
+    ant10: ''
+    ant11: ''
+    ant12: ''
+    ant13: ''
+    ant14: ''
+    ant15: ''
+    ant16: ''
+    ant17: ''
+    ant18: ''
+    ant19: ''
+    ant2: ''
+    ant20: ''
+    ant21: ''
+    ant22: ''
+    ant23: ''
+    ant24: ''
+    ant25: ''
+    ant26: ''
+    ant27: ''
+    ant28: ''
+    ant29: ''
+    ant3: ''
+    ant30: ''
+    ant31: ''
+    ant4: ''
+    ant5: ''
+    ant6: ''
+    ant7: ''
+    ant8: ''
+    ant9: ''
+    args: '""'
+    bb_gain0: '20'
+    bb_gain1: '20'
+    bb_gain10: '20'
+    bb_gain11: '20'
+    bb_gain12: '20'
+    bb_gain13: '20'
+    bb_gain14: '20'
+    bb_gain15: '20'
+    bb_gain16: '20'
+    bb_gain17: '20'
+    bb_gain18: '20'
+    bb_gain19: '20'
+    bb_gain2: '20'
+    bb_gain20: '20'
+    bb_gain21: '20'
+    bb_gain22: '20'
+    bb_gain23: '20'
+    bb_gain24: '20'
+    bb_gain25: '20'
+    bb_gain26: '20'
+    bb_gain27: '20'
+    bb_gain28: '20'
+    bb_gain29: '20'
+    bb_gain3: '20'
+    bb_gain30: '20'
+    bb_gain31: '20'
+    bb_gain4: '20'
+    bb_gain5: '20'
+    bb_gain6: '20'
+    bb_gain7: '20'
+    bb_gain8: '20'
+    bb_gain9: '20'
+    bw0: '0'
+    bw1: '0'
+    bw10: '0'
+    bw11: '0'
+    bw12: '0'
+    bw13: '0'
+    bw14: '0'
+    bw15: '0'
+    bw16: '0'
+    bw17: '0'
+    bw18: '0'
+    bw19: '0'
+    bw2: '0'
+    bw20: '0'
+    bw21: '0'
+    bw22: '0'
+    bw23: '0'
+    bw24: '0'
+    bw25: '0'
+    bw26: '0'
+    bw27: '0'
+    bw28: '0'
+    bw29: '0'
+    bw3: '0'
+    bw30: '0'
+    bw31: '0'
+    bw4: '0'
+    bw5: '0'
+    bw6: '0'
+    bw7: '0'
+    bw8: '0'
+    bw9: '0'
+    clock_source0: ''
+    clock_source1: ''
+    clock_source2: ''
+    clock_source3: ''
+    clock_source4: ''
+    clock_source5: ''
+    clock_source6: ''
+    clock_source7: ''
+    comment: ''
+    corr0: '0'
+    corr1: '0'
+    corr10: '0'
+    corr11: '0'
+    corr12: '0'
+    corr13: '0'
+    corr14: '0'
+    corr15: '0'
+    corr16: '0'
+    corr17: '0'
+    corr18: '0'
+    corr19: '0'
+    corr2: '0'
+    corr20: '0'
+    corr21: '0'
+    corr22: '0'
+    corr23: '0'
+    corr24: '0'
+    corr25: '0'
+    corr26: '0'
+    corr27: '0'
+    corr28: '0'
+    corr29: '0'
+    corr3: '0'
+    corr30: '0'
+    corr31: '0'
+    corr4: '0'
+    corr5: '0'
+    corr6: '0'
+    corr7: '0'
+    corr8: '0'
+    corr9: '0'
+    dc_offset_mode0: '0'
+    dc_offset_mode1: '0'
+    dc_offset_mode10: '0'
+    dc_offset_mode11: '0'
+    dc_offset_mode12: '0'
+    dc_offset_mode13: '0'
+    dc_offset_mode14: '0'
+    dc_offset_mode15: '0'
+    dc_offset_mode16: '0'
+    dc_offset_mode17: '0'
+    dc_offset_mode18: '0'
+    dc_offset_mode19: '0'
+    dc_offset_mode2: '0'
+    dc_offset_mode20: '0'
+    dc_offset_mode21: '0'
+    dc_offset_mode22: '0'
+    dc_offset_mode23: '0'
+    dc_offset_mode24: '0'
+    dc_offset_mode25: '0'
+    dc_offset_mode26: '0'
+    dc_offset_mode27: '0'
+    dc_offset_mode28: '0'
+    dc_offset_mode29: '0'
+    dc_offset_mode3: '0'
+    dc_offset_mode30: '0'
+    dc_offset_mode31: '0'
+    dc_offset_mode4: '0'
+    dc_offset_mode5: '0'
+    dc_offset_mode6: '0'
+    dc_offset_mode7: '0'
+    dc_offset_mode8: '0'
+    dc_offset_mode9: '0'
+    freq0: lo_freq * 1e6
+    freq1: 100e6
+    freq10: 100e6
+    freq11: 100e6
+    freq12: 100e6
+    freq13: 100e6
+    freq14: 100e6
+    freq15: 100e6
+    freq16: 100e6
+    freq17: 100e6
+    freq18: 100e6
+    freq19: 100e6
+    freq2: 100e6
+    freq20: 100e6
+    freq21: 100e6
+    freq22: 100e6
+    freq23: 100e6
+    freq24: 100e6
+    freq25: 100e6
+    freq26: 100e6
+    freq27: 100e6
+    freq28: 100e6
+    freq29: 100e6
+    freq3: 100e6
+    freq30: 100e6
+    freq31: 100e6
+    freq4: 100e6
+    freq5: 100e6
+    freq6: 100e6
+    freq7: 100e6
+    freq8: 100e6
+    freq9: 100e6
+    gain0: rx_gain
+    gain1: '10'
+    gain10: '10'
+    gain11: '10'
+    gain12: '10'
+    gain13: '10'
+    gain14: '10'
+    gain15: '10'
+    gain16: '10'
+    gain17: '10'
+    gain18: '10'
+    gain19: '10'
+    gain2: '10'
+    gain20: '10'
+    gain21: '10'
+    gain22: '10'
+    gain23: '10'
+    gain24: '10'
+    gain25: '10'
+    gain26: '10'
+    gain27: '10'
+    gain28: '10'
+    gain29: '10'
+    gain3: '10'
+    gain30: '10'
+    gain31: '10'
+    gain4: '10'
+    gain5: '10'
+    gain6: '10'
+    gain7: '10'
+    gain8: '10'
+    gain9: '10'
+    gain_mode0: 'False'
+    gain_mode1: 'False'
+    gain_mode10: 'False'
+    gain_mode11: 'False'
+    gain_mode12: 'False'
+    gain_mode13: 'False'
+    gain_mode14: 'False'
+    gain_mode15: 'False'
+    gain_mode16: 'False'
+    gain_mode17: 'False'
+    gain_mode18: 'False'
+    gain_mode19: 'False'
+    gain_mode2: 'False'
+    gain_mode20: 'False'
+    gain_mode21: 'False'
+    gain_mode22: 'False'
+    gain_mode23: 'False'
+    gain_mode24: 'False'
+    gain_mode25: 'False'
+    gain_mode26: 'False'
+    gain_mode27: 'False'
+    gain_mode28: 'False'
+    gain_mode29: 'False'
+    gain_mode3: 'False'
+    gain_mode30: 'False'
+    gain_mode31: 'False'
+    gain_mode4: 'False'
+    gain_mode5: 'False'
+    gain_mode6: 'False'
+    gain_mode7: 'False'
+    gain_mode8: 'False'
+    gain_mode9: 'False'
+    if_gain0: '20'
+    if_gain1: '20'
+    if_gain10: '20'
+    if_gain11: '20'
+    if_gain12: '20'
+    if_gain13: '20'
+    if_gain14: '20'
+    if_gain15: '20'
+    if_gain16: '20'
+    if_gain17: '20'
+    if_gain18: '20'
+    if_gain19: '20'
+    if_gain2: '20'
+    if_gain20: '20'
+    if_gain21: '20'
+    if_gain22: '20'
+    if_gain23: '20'
+    if_gain24: '20'
+    if_gain25: '20'
+    if_gain26: '20'
+    if_gain27: '20'
+    if_gain28: '20'
+    if_gain29: '20'
+    if_gain3: '20'
+    if_gain30: '20'
+    if_gain31: '20'
+    if_gain4: '20'
+    if_gain5: '20'
+    if_gain6: '20'
+    if_gain7: '20'
+    if_gain8: '20'
+    if_gain9: '20'
+    iq_balance_mode0: '0'
+    iq_balance_mode1: '0'
+    iq_balance_mode10: '0'
+    iq_balance_mode11: '0'
+    iq_balance_mode12: '0'
+    iq_balance_mode13: '0'
+    iq_balance_mode14: '0'
+    iq_balance_mode15: '0'
+    iq_balance_mode16: '0'
+    iq_balance_mode17: '0'
+    iq_balance_mode18: '0'
+    iq_balance_mode19: '0'
+    iq_balance_mode2: '0'
+    iq_balance_mode20: '0'
+    iq_balance_mode21: '0'
+    iq_balance_mode22: '0'
+    iq_balance_mode23: '0'
+    iq_balance_mode24: '0'
+    iq_balance_mode25: '0'
+    iq_balance_mode26: '0'
+    iq_balance_mode27: '0'
+    iq_balance_mode28: '0'
+    iq_balance_mode29: '0'
+    iq_balance_mode3: '0'
+    iq_balance_mode30: '0'
+    iq_balance_mode31: '0'
+    iq_balance_mode4: '0'
+    iq_balance_mode5: '0'
+    iq_balance_mode6: '0'
+    iq_balance_mode7: '0'
+    iq_balance_mode8: '0'
+    iq_balance_mode9: '0'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    nchan: '1'
+    num_mboards: '1'
+    sample_rate: samp_rate * OVERSAMPLING
+    sync: sync
+    time_source0: ''
+    time_source1: ''
+    time_source2: ''
+    time_source3: ''
+    time_source4: ''
+    time_source5: ''
+    time_source6: ''
+    time_source7: ''
+    type: fc32
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [256, 332.0]
+    rotation: 0
+    state: disabled
+- name: rx_port
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: str
+    value: '50002'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [408, 92.0]
+    rotation: 0
+    state: enabled
+- name: soapy_rtlsdr_source_0
+  id: soapy_rtlsdr_source
+  parameters:
+    affinity: ''
+    agc: 'False'
+    alias: ''
+    bias: 'False'
+    bufflen: '16384'
+    center_freq: lo_freq*1e6
+    comment: ''
+    dev_args: ''
+    freq_correction: '0'
+    gain: rx_gain
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    type: fc32
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [320, 232.0]
+    rotation: 0
+    state: enabled
+- name: syncword
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: ''
+    value: '"0000011100001001000110110010110101110111100110001010100111111010"'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [448, 12.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [ONBEAT_Demod_1, '0', qtgui_const_sink_x_0, '0']
+- [ONBEAT_Demod_1, '1', qtgui_eye_sink_x_0, '0']
+- [ONBEAT_Demod_1, '2', qtgui_time_sink_x_0, '0']
+- [ONBEAT_Demod_1, out, network_socket_pdu_1, pdus]
+- [rtlsdr_source_0, '0', ONBEAT_Demod_1, '0']
+- [rtlsdr_source_0, '0', qtgui_freq_sink_x_0, '0']
+- [soapy_rtlsdr_source_0, '0', ONBEAT_Demod_1, '0']
+- [soapy_rtlsdr_source_0, '0', qtgui_freq_sink_x_0, '0']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.11.0

onbeat_rx_wrapper.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+import asyncio
+import framing
+from header import Onbeat_Header
+import json
+
+PACKET_LEN=255*4 + 32
+DATA_LEN=223*4
+HEADER_LEN=32
+
+
+async def tcp_client():
+    port = 50002
+    reader, _ = await asyncio.open_connection(
+        '127.0.0.1', port)
+    # output: list[tuple[Onbeat_Header, list[int]]] = []
+    output: list[list[int]] = []
+    packet_loss = 0
+    while message := await reader.read(PACKET_LEN):
+        try:
+            received = framing.decode_packet([i for i in message])
+            output.append([i for i in message])
+            print("pkt received")
+            if received[0].pkt_len == 0:
+                break
+        except KeyboardInterrupt:
+            break
+        except Exception as e:
+            packet_loss += 1
+            print(e)
+
+    return output
+
+
+rs_coding = False
+filename = "loremipsum"
+received = asyncio.run(tcp_client())
+
+
+
+with open("rx_packets.json", mode="w") as packetfile:
+    json.dump(received, packetfile)

onbeat_tx.grc

@@ -0,0 +1,311 @@
+options:
+  parameters:
+    author: HA5PLS
+    catch_exceptions: 'True'
+    category: '[GRC Hier Blocks]'
+    cmake_opt: ''
+    comment: ''
+    copyright: GPL 3.0 or later
+    description: Transmitter flowgraph for onbeat
+    gen_cmake: 'On'
+    gen_linking: dynamic
+    generate_options: qt_gui
+    hier_block_src_path: '.:'
+    id: onbeat_tx
+    max_nouts: '0'
+    output_language: python
+    placement: (0,0)
+    qt_qss_theme: ''
+    realtime_scheduling: ''
+    run: 'True'
+    run_command: '{python} -u {filename}'
+    run_options: prompt
+    sizing_mode: fixed
+    thread_safe_setters: ''
+    title: ONBEAT transmitter
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: OVERSAMPLING
+  id: variable
+  parameters:
+    comment: ''
+    value: '100'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [288, 12.0]
+    rotation: 0
+    state: enabled
+- name: RRC_ALPHA
+  id: variable
+  parameters:
+    comment: ''
+    value: '0.35'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [816, 12.0]
+    rotation: 0
+    state: enabled
+- name: lo_freq
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: TX frequency
+    min_len: '200'
+    orient: QtCore.Qt.Horizontal
+    rangeType: int
+    start: '50'
+    step: '1'
+    stop: '3000'
+    value: '433'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [192, 92.0]
+    rotation: 0
+    state: true
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: 1e6
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [192, 12.0]
+    rotation: 0
+    state: enabled
+- name: symbol_map
+  id: variable
+  parameters:
+    comment: ''
+    value: '[0, 1, 3, 2]'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [712, 12.0]
+    rotation: 0
+    state: enabled
+- name: ONBEAT_Mod_0
+  id: ONBEAT_Mod
+  parameters:
+    OVERSAMPLING: OVERSAMPLING
+    RRC_ALPHA: RRC_ALPHA
+    affinity: ''
+    alias: ''
+    comment: ''
+    data_len: '1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    preamble: '[0x33 for i in range(0, 128*2, 8)]'
+    syncword: syncword
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [832, 176.0]
+    rotation: 0
+    state: enabled
+- name: iio_pluto_sink_0
+  id: iio_pluto_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    attenuation1: '5.0'
+    bandwidth: '20000000'
+    buffer_size: '32768'
+    comment: ''
+    cyclic: 'False'
+    filter: ''
+    filter_source: '''Auto'''
+    fpass: '0'
+    frequency: lo_freq * 1000000
+    fstop: '0'
+    len_tag_key: ''
+    samplerate: int(samp_rate)
+    type: fc32
+    uri: ''
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1168, 148.0]
+    rotation: 0
+    state: true
+- name: network_socket_pdu_1
+  id: network_socket_pdu
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    host: 0.0.0.0
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    mtu: '10000'
+    port: tx_port
+    tcp_no_delay: 'False'
+    type: TCP_SERVER
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [408, 184.0]
+    rotation: 0
+    state: enabled
+- name: pdu_pdu_to_tagged_stream_0
+  id: pdu_pdu_to_tagged_stream
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    tag: packet_len
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [608, 208.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_freq_sink_x_0
+  id: qtgui_freq_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    average: '1.0'
+    axislabels: 'True'
+    bw: samp_rate
+    color1: '"blue"'
+    color10: '"dark blue"'
+    color2: '"red"'
+    color3: '"green"'
+    color4: '"black"'
+    color5: '"cyan"'
+    color6: '"magenta"'
+    color7: '"yellow"'
+    color8: '"dark red"'
+    color9: '"dark green"'
+    comment: ''
+    ctrlpanel: 'False'
+    fc: lo_freq * 1e6
+    fftsize: '1024'
+    freqhalf: 'True'
+    grid: 'False'
+    gui_hint: ''
+    label: Relative Gain
+    label1: ''
+    label10: ''''''
+    label2: ''''''
+    label3: ''''''
+    label4: ''''''
+    label5: ''''''
+    label6: ''''''
+    label7: ''''''
+    label8: ''''''
+    label9: ''''''
+    legend: 'True'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    name: '""'
+    nconnections: '1'
+    norm_window: 'False'
+    showports: 'False'
+    tr_chan: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_tag: '""'
+    type: complex
+    units: dB
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    wintype: window.WIN_BLACKMAN_hARRIS
+    ymax: '10'
+    ymin: '-140'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1176, 340.0]
+    rotation: 0
+    state: true
+- name: syncword
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: ''
+    value: '"0000011100001001000110110010110101110111100110001010100111111010"'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [448, 12.0]
+    rotation: 0
+    state: enabled
+- name: tx_port
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: str
+    value: '50001'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [408, 92.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [ONBEAT_Mod_0, '0', iio_pluto_sink_0, '0']
+- [ONBEAT_Mod_0, '0', qtgui_freq_sink_x_0, '0']
+- [network_socket_pdu_1, pdus, pdu_pdu_to_tagged_stream_0, pdus]
+- [pdu_pdu_to_tagged_stream_0, '0', ONBEAT_Mod_0, '0']
+
+metadata:
+  file_format: 1

onbeat_tx_wrapper.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+import asyncio
+from time import sleep
+import framing
+# from header import Onbeat_Header
+import json
+
+PACKET_LEN=255*4 + 32
+DATA_LEN=223*4
+HEADER_LEN=32
+
+
+async def tcp_client(file_2_send: str, callsign: str, rs_coding: bool = True):
+    port = 50001
+    _, writer = await asyncio.open_connection(
+        '127.0.0.1', port)
+    with open(file_2_send, "rb") as file_to_send:
+        seq = 0
+        sent: list[list[int]] = []
+        try:
+            while message := file_to_send.read(DATA_LEN if rs_coding == True else (PACKET_LEN - HEADER_LEN)):
+                sent.append([i for i in message])
+                frame = bytes(framing.encode_packet([i for i in message], callsign, seq%256, rs_coding))
+                writer.write(frame)
+                seq += 1
+                print(seq)
+                sleep(0.01)
+            else:
+                frame = bytes(framing.encode_packet([], callsign, seq%256, rs_coding))
+                for _ in range(0,4):
+                    writer.write(frame)
+                    sleep(0.01)
+                    sent.append([])
+        except KeyboardInterrupt:
+            return sent
+
+
+rs_coding = True
+filename = "/home/lacko/live_output/2025-11-01_12-39_elektro_lrit_1.691 GHz/IMAGES/ELEKTRO-L3/2025-11-01_12-30-00/msu_gs_Color IR Merge.png"
+sent = asyncio.run(tcp_client(filename, "HA5PLS", rs_coding))
+
+
+
+with open("packets.json", mode="w") as packetfile:
+    json.dump(sent, packetfile)

simulation/awgn.grc

@@ -0,0 +1,694 @@
+options:
+  parameters:
+    author: HA5PLS
+    catch_exceptions: 'True'
+    category: '[GRC Hier Blocks]'
+    cmake_opt: ''
+    comment: ''
+    copyright: GPL 3.0 or later
+    description: wrapper around ONBEAT modulator/demodulator for BER simulation
+    gen_cmake: 'On'
+    gen_linking: dynamic
+    generate_options: qt_gui
+    hier_block_src_path: '.:'
+    id: ONBEAT_AWGN_sim
+    max_nouts: '0'
+    output_language: python
+    placement: (0,0)
+    qt_qss_theme: ''
+    realtime_scheduling: ''
+    run: 'True'
+    run_command: '{python} -u {filename}'
+    run_options: run
+    sizing_mode: fixed
+    thread_safe_setters: ''
+    title: ONBEAT AWGN simulator
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [16, 16.0]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: OVERSAMPLING
+  id: variable
+  parameters:
+    comment: ''
+    value: '2'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [288, 16.0]
+    rotation: 0
+    state: enabled
+- name: RRC_ALPHA
+  id: variable
+  parameters:
+    comment: ''
+    value: '0.35'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [816, 16.0]
+    rotation: 0
+    state: enabled
+- name: full_packet_len
+  id: variable
+  parameters:
+    comment: ''
+    value: data_len*8
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [456, 88.0]
+    rotation: 0
+    state: enabled
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: 1e6
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [200, 16.0]
+    rotation: 0
+    state: enabled
+- name: symbol_map
+  id: variable
+  parameters:
+    comment: ''
+    value: '[0, 1, 3, 2]'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [720, 16.0]
+    rotation: 0
+    state: enabled
+- name: EbN0
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: '3'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [864, 136.0]
+    rotation: 0
+    state: enabled
+- name: ONBEAT_Demod_0
+  id: ONBEAT_Demod
+  parameters:
+    FULL_PACKET_LEN: full_packet_len
+    OVERSAMPLING: OVERSAMPLING
+    RRC_ALPHA: RRC_ALPHA
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    roc_tolerance: '0.8'
+    samp_rate: samp_rate
+    symbol_map: symbol_map
+    syncword: syncword
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [248, 484.0]
+    rotation: 0
+    state: enabled
+- name: ONBEAT_Mod_0
+  id: ONBEAT_Mod
+  parameters:
+    OVERSAMPLING: OVERSAMPLING
+    RRC_ALPHA: RRC_ALPHA
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    preamble: '[0x33 for i in range(0, 128*2, 8)]'
+    syncword: syncword
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [480, 264.0]
+    rotation: 0
+    state: enabled
+- name: blocks_tag_gate_0
+  id: blocks_tag_gate
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    propagate_tags: 'False'
+    single_key: '""'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [744, 280.0]
+    rotation: 0
+    state: enabled
+- name: blocks_throttle2_0
+  id: blocks_throttle2
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    ignoretag: 'True'
+    limit: auto
+    maximum: '0.1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samples_per_second: samp_rate*1000
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1144, 280.0]
+    rotation: 0
+    state: enabled
+- name: channels_channel_model_0
+  id: channels_channel_model
+  parameters:
+    affinity: ''
+    alias: ''
+    block_tags: 'False'
+    comment: ''
+    epsilon: time_offset
+    freq_offset: freq_offset
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    noise_voltage: 1.0/sqrt(2* 10**(float(EbN0) / 10)) * sqrt(OVERSAMPLING/2)
+    seed: '0'
+    taps: '1.0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [928, 248.0]
+    rotation: 0
+    state: enabled
+- name: data_len
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: intx
+    value: 255*4 + 32
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [576, 88.0]
+    rotation: 0
+    state: enabled
+- name: freq_offset
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [960, 136.0]
+    rotation: 0
+    state: enabled
+- name: import_0
+  id: import
+  parameters:
+    alias: ''
+    comment: ''
+    imports: from math import log10, log2, sqrt
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [968, 24.0]
+    rotation: 0
+    state: enabled
+- name: network_socket_pdu_1
+  id: network_socket_pdu
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    host: 0.0.0.0
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    mtu: '10000'
+    port: tx_port
+    tcp_no_delay: 'False'
+    type: TCP_SERVER
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [40, 264.0]
+    rotation: 0
+    state: enabled
+- name: pdu_pdu_to_tagged_stream_0
+  id: pdu_pdu_to_tagged_stream
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    tag: packet_len
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [240, 288.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_const_sink_x_0
+  id: qtgui_const_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    axislabels: 'True'
+    color1: '"blue"'
+    color10: '"dark blue"'
+    color2: '"red"'
+    color3: '"green"'
+    color4: '"black"'
+    color5: '"cyan"'
+    color6: '"magenta"'
+    color7: '"yellow"'
+    color8: '"dark red"'
+    color9: '"dark green"'
+    comment: ''
+    grid: 'False'
+    gui_hint: ''
+    label1: ''
+    label10: ''
+    label2: ''
+    label3: ''
+    label4: ''
+    label5: ''
+    label6: ''
+    label7: ''
+    label8: ''
+    label9: ''
+    legend: 'True'
+    marker1: '0'
+    marker10: '0'
+    marker2: '0'
+    marker3: '0'
+    marker4: '0'
+    marker5: '0'
+    marker6: '0'
+    marker7: '0'
+    marker8: '0'
+    marker9: '0'
+    name: '""'
+    nconnections: '1'
+    size: '128'
+    style1: '0'
+    style10: '0'
+    style2: '0'
+    style3: '0'
+    style4: '0'
+    style5: '0'
+    style6: '0'
+    style7: '0'
+    style8: '0'
+    style9: '0'
+    tr_chan: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_slope: qtgui.TRIG_SLOPE_POS
+    tr_tag: '""'
+    type: complex
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    xmax: '2'
+    xmin: '-2'
+    ymax: '2'
+    ymin: '-2'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 400.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_eye_sink_x_0
+  id: qtgui_eye_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    axislabels: 'True'
+    color1: blue
+    color10: blue
+    color2: blue
+    color3: blue
+    color4: blue
+    color5: blue
+    color6: blue
+    color7: blue
+    color8: blue
+    color9: blue
+    comment: ''
+    ctrlpanel: 'False'
+    entags: 'True'
+    grid: 'False'
+    gui_hint: ''
+    label1: Signal 1
+    label10: Signal 10
+    label2: Signal 2
+    label3: Signal 3
+    label4: Signal 4
+    label5: Signal 5
+    label6: Signal 6
+    label7: Signal 7
+    label8: Signal 8
+    label9: Signal 9
+    legend: 'True'
+    marker1: '-1'
+    marker10: '-1'
+    marker2: '-1'
+    marker3: '-1'
+    marker4: '-1'
+    marker5: '-1'
+    marker6: '-1'
+    marker7: '-1'
+    marker8: '-1'
+    marker9: '-1'
+    nconnections: '1'
+    samp_per_symbol: '1'
+    size: '128'
+    srate: samp_rate
+    style1: '1'
+    style10: '1'
+    style2: '1'
+    style3: '1'
+    style4: '1'
+    style5: '1'
+    style6: '1'
+    style7: '1'
+    style8: '1'
+    style9: '1'
+    tr_chan: '0'
+    tr_delay: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_slope: qtgui.TRIG_SLOPE_POS
+    tr_tag: '""'
+    type: complex
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    ylabel: Amplitude
+    ymax: '1'
+    ymin: '-1'
+    yunit: '""'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 472.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_time_sink_x_0
+  id: qtgui_time_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    axislabels: 'True'
+    color1: blue
+    color10: dark blue
+    color2: red
+    color3: green
+    color4: black
+    color5: cyan
+    color6: magenta
+    color7: yellow
+    color8: dark red
+    color9: dark green
+    comment: ''
+    ctrlpanel: 'False'
+    entags: 'True'
+    grid: 'False'
+    gui_hint: ''
+    label1: Signal 1
+    label10: Signal 10
+    label2: Signal 2
+    label3: Signal 3
+    label4: Signal 4
+    label5: Signal 5
+    label6: Signal 6
+    label7: Signal 7
+    label8: Signal 8
+    label9: Signal 9
+    legend: 'True'
+    marker1: '-1'
+    marker10: '-1'
+    marker2: '-1'
+    marker3: '-1'
+    marker4: '-1'
+    marker5: '-1'
+    marker6: '-1'
+    marker7: '-1'
+    marker8: '-1'
+    marker9: '-1'
+    name: '""'
+    nconnections: '1'
+    size: '1024'
+    srate: samp_rate/5
+    stemplot: 'False'
+    style1: '1'
+    style10: '1'
+    style2: '1'
+    style3: '1'
+    style4: '1'
+    style5: '1'
+    style6: '1'
+    style7: '1'
+    style8: '1'
+    style9: '1'
+    tr_chan: '0'
+    tr_delay: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_slope: qtgui.TRIG_SLOPE_POS
+    tr_tag: '""'
+    type: complex
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    ylabel: Amplitude
+    ymax: '1'
+    ymin: '-1'
+    yunit: '""'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [616, 576.0]
+    rotation: 0
+    state: enabled
+- name: rx_port
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: str
+    value: '50002'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [104, 152.0]
+    rotation: 0
+    state: enabled
+- name: syncword
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: ''
+    value: '"0000011100001001000110110010110101110111100110001010100111111010"'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [456, 16.0]
+    rotation: 0
+    state: enabled
+- name: time_offset
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: eng_float
+    value: '1.0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1064, 136.0]
+    rotation: 0
+    state: enabled
+- name: tx_port
+  id: parameter
+  parameters:
+    alias: ''
+    comment: ''
+    hide: none
+    label: ''
+    short_id: ''
+    type: str
+    value: '50001'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [16, 152.0]
+    rotation: 0
+    state: enabled
+- name: virtual_sink_0
+  id: virtual_sink
+  parameters:
+    alias: ''
+    comment: ''
+    stream_id: receiver_in
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1320, 288.0]
+    rotation: 0
+    state: enabled
+- name: virtual_source_0
+  id: virtual_source
+  parameters:
+    alias: ''
+    comment: ''
+    stream_id: receiver_in
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [40, 536.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [ONBEAT_Demod_0, '0', qtgui_const_sink_x_0, '0']
+- [ONBEAT_Demod_0, '1', qtgui_eye_sink_x_0, '0']
+- [ONBEAT_Demod_0, '2', qtgui_time_sink_x_0, '0']
+- [ONBEAT_Demod_0, out, network_socket_pdu_1, pdus]
+- [ONBEAT_Mod_0, '0', blocks_tag_gate_0, '0']
+- [blocks_tag_gate_0, '0', channels_channel_model_0, '0']
+- [blocks_throttle2_0, '0', virtual_sink_0, '0']
+- [channels_channel_model_0, '0', blocks_throttle2_0, '0']
+- [network_socket_pdu_1, pdus, pdu_pdu_to_tagged_stream_0, pdus]
+- [pdu_pdu_to_tagged_stream_0, '0', ONBEAT_Mod_0, '0']
+- [virtual_source_0, '0', ONBEAT_Demod_0, '0']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.11.0