mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
313 lines
No EOL
13 KiB
Python
313 lines
No EOL
13 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Sun Dec 27 20:43:40 2020
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@author: DJ2LS
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"""
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# CRC aller payloads via XOR scrambeln und dann eine CRC8 mitsenden
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import logging
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import crcengine
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import threading
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import time
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import static
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import modem
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import other
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modem = modem.RF()
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crc_algorithm = crcengine.new('crc16-ccitt-false') #load crc16 library
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static.ARQ_PAYLOAD_PER_FRAME = static.FREEDV_PAYLOAD_PER_FRAME - 6
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def data_received(data_in):
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ARQ_N_RX_BURSTS = int.from_bytes(bytes(data_in[:1]), "big") - 10
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static.ARQ_RX_BURST_BUFFER.append(data_in) #append data to RX BUFFER
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print(ARQ_N_RX_BURSTS)
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#while static.ACK_RX_TIMEOUT == 0: #define timeout where data has to be received untl error occurs
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if len(static.ARQ_RX_BURST_BUFFER) == ARQ_N_RX_BURSTS: #if received bursts are equal to burst number in frame
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burst_total_payload = bytearray()
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for n_raw_frame in range(0,len(static.ARQ_RX_BURST_BUFFER)):
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burst_frame = static.ARQ_RX_BURST_BUFFER[n_raw_frame] #get burst frame
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burst_payload = burst_frame[3:] #remove frame type and burst CRC
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burst_total_payload = burst_total_payload + burst_payload #stick bursts together
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print(burst_total_payload)
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burst_payload_crc = crc_algorithm(burst_total_payload)
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burst_payload_crc = burst_payload_crc.to_bytes(2, byteorder='big')
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print(burst_payload_crc)
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if burst_payload_crc == data_in[1:3]: #IF burst payload crc and input crc are equal
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print(data_in[1:3])
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print("CRC EQUAL")
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logging.info("TX | SENDING ACK [" + str(data_in[1:3]) +"]")
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static.ARQ_RX_FRAME_BUFFER.append(burst_total_payload) # IF CRC TRUE APPEND burst_total_payload TO ARQ_RX_FRAME_BUFFER
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print(data_in[7:9])
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# -------- DETECT IF WE HAVE A FRAME HEADER
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if data_in[7:9].startswith(b'\xAA\xAA'):
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print("DAS IST DER ERSTE BURST MIT BOF!!!")
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print("FRAME CRC = " + str(data_in[5:7]))
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print("FRAME BURSTS = " + str(data_in[3:5]))
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static.FRAME_CRC = data_in[5:7]
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if data_in.rstrip(b'\x00').endswith(b'\xFF\xFF'):
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print("DAS IST DER LETZTE BURST MIT EOF!!!")
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# WENN DAS HIER ERFÜLLT IST, DANN KÖNNEN WIR MAL SCHAUEN WAS WIR AUSGEBEN KÖNNEN
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print(len(static.ARQ_RX_FRAME_BUFFER))
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total_frame = bytearray()
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for b in range(len(static.ARQ_RX_FRAME_BUFFER)):
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total_frame = total_frame + static.ARQ_RX_FRAME_BUFFER[b]
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#print(total_frame)
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payload = total_frame.split(b'\xAA\xAA')
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payload = payload[1]
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payload = payload.split(b'\xFF\xFF')
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payload = payload[0]
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frame_payload_crc = crc_algorithm(payload)
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frame_payload_crc = frame_payload_crc.to_bytes(2, byteorder='big')
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if static.FRAME_CRC == frame_payload_crc:
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print("FRAME CRC PASST")
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print(payload)
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else:
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print("FRAME CRC PASST NICHT")
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print(static.FRAME_CRC)
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print(frame_payload_crc)
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print(payload)
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#BUILDING ACK FRAME -----------------------------------------------
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ack_frame = b'\7' + bytes(burst_payload_crc)
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ack_buffer = bytearray(static.ARQ_PAYLOAD_PER_FRAME)
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ack_buffer[:len(ack_frame)] = ack_frame # set buffersize to length of data which will be send
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#TRANSMIT ACK FRAME -----------------------------------------------
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time.sleep(2)
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modem.Transmit(ack_buffer)
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static.ARQ_RX_BURST_BUFFER = []
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else: #IF burst payload crc and input crc are NOT equal
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print("CRC NOT EQUAL!!!!!")
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print(data_in[1:3])
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static.ARQ_RX_BURST_BUFFER = []
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def ack_received():
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logging.info("RX | ACK RCVD!")
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static.ACK_TIMEOUT = 1 #Force timer to stop waiting
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static.ACK_RECEIVED = 1 #Force data loops of TNC to stop and continue with next frame
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# static.ARQ_ACK_WAITING_FOR_ID
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def transmit(data_out):
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static.ARQ_PAYLOAD_PER_FRAME = static.FREEDV_PAYLOAD_PER_FRAME - 3
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#----------------------- BUILD A FRAME WITH CRC AND N BURSTS
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frame_BOF = b'\xAA\xAA'
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frame_EOF = b'\xFF\xFF'
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frame_header_length = 8
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n_bursts_prediction = (len(data_out)+frame_header_length) // static.ARQ_PAYLOAD_PER_FRAME + ((len(data_out)+frame_header_length) % static.ARQ_PAYLOAD_PER_FRAME > 0) # aufrunden 3.2 = 4
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n_bursts_prediction = n_bursts_prediction.to_bytes(2, byteorder='big') #65535
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frame_payload_crc = crc_algorithm(data_out)
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frame_payload_crc = frame_payload_crc.to_bytes(2, byteorder='big')
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data_out = n_bursts_prediction + frame_payload_crc + frame_BOF + data_out + frame_EOF
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# 2 2 2 N 2
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print(data_out)
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# --------------------------------------------- START OF MAIN DATA LOOP
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static.TX_BUFFER = [data_out[i:i+static.ARQ_PAYLOAD_PER_FRAME] for i in range(0, len(data_out), static.ARQ_PAYLOAD_PER_FRAME)] # split incomming bytes to size of 30bytes - arq payload
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static.TX_BUFFER_SIZE = len(static.TX_BUFFER)
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static.ARQ_TX_N_FRAMES = n_frames_per_burst(len(data_out)) # DEFINE NUMBER OF FRAMES PER BURSTS
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logging.info("TX | TOTAL PAYLOAD BYTES/FRAMES TO SEND: " + str(len(data_out)) + " / " + str(static.TX_BUFFER_SIZE))
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#print(static.TX_BUFFER[2])
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for n_raw_frame in range(0, static.TX_BUFFER_SIZE, static.ARQ_TX_N_FRAMES): # LOOP THROUGH DATA LIST with steps = ARQ_TX_N_FRAMES
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# ----------- GENERATE PAYLOAD CRC FOR ARQ_TX_N_FRAMES
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burst_total_payload = bytearray()
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#----------------------------------------------------------------------------------------------------------
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try: # DETECT IF LAST BURST
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for i in range(static.ARQ_TX_N_FRAMES): #bytearray(b'111111111111111111111111222222222222222222222222')
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# we need to make sure, payload data is always as long as static.ARQ_PAYLOAD_PER_FRAME beacuse of CRC!
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burst_raw_payload = static.TX_BUFFER[n_raw_frame + i]
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burst_payload = bytearray(static.ARQ_PAYLOAD_PER_FRAME)
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burst_payload[:len(burst_raw_payload)] = burst_raw_payload # set buffersize to length of data which will be send
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burst_total_payload = burst_total_payload + burst_payload
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except IndexError: # IF LAST BURST DETECTED BUILD CRC WITH LESS FRAMES AND SET static.ARQ_TX_N_FRAMES TO VALUE OF REST!
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print("LAST BURST!!!")
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burst_total_payload = bytearray() # reset burst_total_payload because of possible input remaining of detecting loop one step above
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n_last_burst = (static.TX_BUFFER_SIZE % n_raw_frame)
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print(n_last_burst)
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static.ARQ_TX_N_FRAMES = n_last_burst
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for i in range(n_last_burst): #bytearray(b'111111111111111111111111222222222222222222222222')
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burst_raw_payload = static.TX_BUFFER[n_raw_frame + i]
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burst_payload = bytearray(static.ARQ_PAYLOAD_PER_FRAME)
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burst_payload[:len(burst_raw_payload)] = burst_raw_payload # set buffersize to length of data which will be send
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burst_total_payload = burst_total_payload + burst_payload
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#----------------------------------------------------------------------------------------------------------
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print(burst_total_payload)
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burst_payload_crc = crc_algorithm(burst_total_payload)
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burst_payload_crc = burst_payload_crc.to_bytes(2, byteorder='big')
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print(burst_payload_crc)
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static.ARQ_ACK_WAITING_FOR_ID = burst_payload_crc #set the global variable so we know for which ACK we are waiting for
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#----------------------------------------------------------------------------------------------------------
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#-------------------- BUILD ARQBURSTS
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arqburst = []
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for i in range(static.ARQ_TX_N_FRAMES):
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frame_type = 10 + static.ARQ_TX_N_FRAMES
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frame_type = bytes([frame_type])
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payload_data = bytes(static.TX_BUFFER[n_raw_frame + i])
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arqframe = frame_type + burst_payload_crc + payload_data
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buffer = bytearray(static.FREEDV_PAYLOAD_PER_FRAME) # create TX buffer
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buffer[:len(arqframe)] = arqframe # set buffersize to length of data which will be send
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arqburst.append(buffer)
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#----------------------------------------------------------------------------------------------------------
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#--------------------------------------------- N ATTEMPTS TO SEND BURSTS IF ACK FAILS
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for static.TX_N_RETRIES in range(static.TX_N_MAX_RETRIES):
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static.ACK_RECEIVED = 0
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# ----------------------- Loop through ARQ FRAMES BUFFER with N = Numbers of frames which will be send at once
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for n in range(static.ARQ_TX_N_FRAMES):
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logging.info("TX | SENDING BURST " + str(n+1) + " / " + str(static.ARQ_TX_N_FRAMES))
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modem.Transmit(arqburst[n])
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time.sleep(2)
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#modem.RF.Transmit(arqburst[n])
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print(arqburst[n])
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# --------------------------- START TIMER ---> IF TIMEOUT REACHED, ACK_TIMEOUT = 1
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static.ACK_TIMEOUT = 0
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timer = threading.Timer(static.ACK_TIMEOUT_SECONDS * static.ARQ_TX_N_FRAMES, other.timeout)
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timer.start()
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# --------------------------- WHILE TIMEOUT NOT REACHED AND NO ACK RECEIVED --> LISTEN
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logging.info("TX | WAITING FOR ACK")
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while static.ACK_TIMEOUT == 0 and static.ACK_RECEIVED == 0:
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static.MODEM_RECEIVE = True
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else:
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logging.info("TX | ACK TIMEOUT - SENDING AGAIN")
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#--------------- BREAK LOOP IF ACK HAS BEEN RECEIVED
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if static.ACK_RECEIVED == 1:
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#static.TX_N_RETRIES = 3
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break
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# ----------- if no ACK received and out of retries.....stop frame sending
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if static.ACK_RECEIVED == 0:
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logging.info("TX | NO ACK RECEIVED | FRAME NEEDS TO BE RESEND!")
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break
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#-------------------------BREAK TX BUFFER LOOP IF ALL PACKETS HAVE BEEN SENT
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if n_raw_frame == static.TX_BUFFER_SIZE:
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break
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# ------------ TIMER TO WAIT UNTIL NEXT PACKAGE WILL BE SEND TO PREVENT TIME ISSEUS
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time.sleep(5)
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logging.info("TX | BUFFER EMPTY")
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# BURST MACHINE TO DEFINE N BURSTS PER FRAME
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def n_frames_per_burst(len_data):
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if len_data <= static.ARQ_PAYLOAD_PER_FRAME:
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n_frames_per_burst = 1
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else:
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n_frames_per_burst = 1
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return n_frames_per_burst |