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https://github.com/DJ2LS/FreeDATA
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code cleanup
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DJ2LS
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107
arq.py
107
arq.py
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@ -9,45 +9,36 @@ Created on Sun Dec 27 20:43:40 2020
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import logging
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import threading
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import time
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from random import randrange
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import static
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import modem
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import helpers
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from random import randrange
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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 - 3 #6?!
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static.ARQ_ACK_PAYLOAD_PER_FRAME = 14 - 2# --> 700D
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def arq_ack_timeout():
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static.ACK_TIMEOUT = 1
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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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ARQ_N_RX_BURSTS = int.from_bytes(bytes(data_in[:1]), "big") - 10 #get number of bursts from received frame
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static.ARQ_RX_BURST_BUFFER.append(data_in) #append data to RX BUFFER
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print("WAITING FOR BURSTS: " + str(ARQ_N_RX_BURSTS))
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print("ARQ_RX_BURST_BUFFER: " + str(len(static.ARQ_RX_BURST_BUFFER)))
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burst_total_payload = bytearray()
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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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@ -55,44 +46,26 @@ def data_received(data_in):
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burst_total_payload = burst_total_payload + burst_payload #stick bursts together
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# ------------------ caculate CRC of BURST
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#print(burst_total_payload)
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# helpers.get_crc_16(data)
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burst_payload_crc = helpers.get_crc_16(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 CRC IS CORRECT, APPEND BURST TO BUFFER AND SEND ACK FRAME
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if burst_payload_crc == data_in[1:3]:
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##### WAIT SOME TIME TO PREVENT TIMING ISSUES --> NEEDS TO BE OPTIMIZED LATER
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#####time.sleep(2)
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logging.info("BURST CRC ARE EQUAL!")
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#print(burst_total_payload)
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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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#BUILDING ACK FRAME -----------------------------------------------
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ack_payload = bytes(burst_payload_crc)
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#ack_frame = b'\7'+ bytes(burst_payload_crc)
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#ack_preamble = b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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ack_frame = b'<'+ bytes(burst_payload_crc) # < = 60
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#ack_frame[1] = b'\7'
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#ack_frame[2] = helpers.get_crc8(data)
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#ack_frame[3:4] = bytes(burst_payload_crc)
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frametype = int.from_bytes(bytes(ack_frame[:1]), "big")
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print("ACK TYPE: " + str(frametype))
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ack_buffer = bytearray(static.ARQ_ACK_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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@ -113,7 +86,6 @@ def data_received(data_in):
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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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# LOOP THOUGH FRAME BUFFER AND STICK EVERYTHING TOGETHER
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@ -138,14 +110,11 @@ def data_received(data_in):
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if burst_total_payload.rstrip(b'\x00').endswith(b'\xFF\xFF'):
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print("DAS IST DER LETZTE BURST MIT EOF!!!")
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print("WEITER GEHTS")
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print("WEITER GEHTS...")
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# NOW WE TRY TO SEPARATE THE FRAME CRC FOR A CRC CALCULATION
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frame_payload = complete_frame.rstrip(b'\x00') #REMOVE x00
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frame_payload = frame_payload[6:-2] #THIS IS THE FRAME PAYLOAD
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frame_payload = frame_payload[6:-2] #THIS IS THE FRAME PAYLOAD
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frame_payload_crc = helpers.get_crc_16(frame_payload)
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#frame_payload_crc = crc_algorithm(frame_payload)
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#frame_payload_crc = frame_payload_crc.to_bytes(2, byteorder='big')
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#IF THE FRAME PAYLOAD CRC IS EQUAL TO THE FRAME CRC WHICH IS KNOWN FROM THE HEADER --> SUCCESS
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if frame_payload_crc == static.FRAME_CRC:
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@ -161,10 +130,6 @@ def data_received(data_in):
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# print("FRAME PAYLOAD: " + str(frame_payload))
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#print("COMPLETE FRAME: " + str(complete_frame))
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#static.ARQ_RX_FRAME_BUFFER = [] # ---> BUFFER ERST LÖSCHEN WENN MINDESTANZAHL AN BURSTS ERHALTEN WORDEN SIND
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def ack_received():
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@ -173,29 +138,20 @@ def ack_received():
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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 SO THE RECEIVER GETS THIS INFORMATION
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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 = helpers.get_crc_16(data_out)
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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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# This is the total frame with frame header, which will be send
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data_out = n_bursts_prediction + frame_payload_crc + frame_BOF + data_out + frame_EOF
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@ -208,11 +164,9 @@ def transmit(data_out):
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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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###static.ACK_RECEIVED = 0 # SET ACK RECEIVED TO 0 IF NOT ALREADY DONE TO BE SURE WE HAVE A NEW CYCLE
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# --------------------------------------------- THIS IS THE MAIN LOOP
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static.ARQ_N_SENT_FRAMES = 0 # SET N SENT FRAMES TO 0 FOR A NEW SENDING CYCLE
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while static.ARQ_N_SENT_FRAMES <= static.TX_BUFFER_SIZE:
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@ -223,9 +177,7 @@ def transmit(data_out):
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static.ARQ_TX_N_FRAMES = get_n_frames_per_burst()
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static.ACK_RECEIVED = 0 # SET ACK RECEIVED TO 0 IF NOT ALREADY DONE TO BE SURE WE HAVE A NEW CYCLE
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#################################################################
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# ----------- SET FRAME PAYLOAD TO BE ABLE TO CREATE CRC
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burst_total_payload = bytearray()
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@ -261,21 +213,13 @@ def transmit(data_out):
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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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# ----------- GENERATE PAYLOAD CRC FOR ARQ_TX_N_FRAMES
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burst_payload_crc = helpers.get_crc_16(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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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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#------------------ BUILD ARQBURSTS---------------------------------------------
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arqburst = []
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for i in range(static.ARQ_TX_N_FRAMES):
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@ -291,8 +235,6 @@ def transmit(data_out):
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arqburst.append(buffer) #append data to a buffer array, so we can loop through it
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#--------------------------------------------- N ATTEMPTS TO SEND BURSTS IF ACK RECEPTION FAILS
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for static.TX_N_RETRIES in range(static.TX_N_MAX_RETRIES):
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@ -313,7 +255,6 @@ def transmit(data_out):
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#static.MODEM_RECEIVE = False
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# --------------------------- WHILE TIMEOUT NOT REACHED AND NO ACK RECEIVED --> LISTEN
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while static.ACK_TIMEOUT == 0 and static.ACK_RECEIVED == 0:
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time.sleep(0.05) # here we reduce CPU load
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@ -330,10 +271,7 @@ def transmit(data_out):
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if static.ACK_RECEIVED == 1:
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#static.MODEM_RECEIVE = False
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#time.sleep(1)
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#time.sleep(1)
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#-----------IF ACK RECEIVED, INCREMENT ITERATOR FOR MAIN LOOP TO PROCEED WITH NEXT FRAMES/BURST
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static.ARQ_N_SENT_FRAMES = static.ARQ_N_SENT_FRAMES + static.ARQ_TX_N_FRAMES
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@ -347,10 +285,7 @@ def transmit(data_out):
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#-------------------------BREAK TX BUFFER LOOP IF ALL PACKETS HAVE BEEN SENT
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if static.ARQ_N_SENT_FRAMES == static.TX_BUFFER_SIZE:
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break
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break
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# ------------ TIMER TO WAIT UNTIL NEXT PACKAGE WILL BE SEND TO PREVENT TIME ISSEUS --> NEEDS TO BE IMPROVED LATER
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time.sleep(5)
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@ -358,13 +293,9 @@ def transmit(data_out):
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# IF TX BUFFER IS EMPTY / ALL FRAMES HAVE BEEN SENT --> HERE WE COULD ADD AN static.VAR for IDLE STATE
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logging.info("TX | BUFFER EMPTY")
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# BURST MACHINE TO DEFINE N BURSTS PER FRAME ---> LATER WE CAN USE CHANNEL MESSUREMENT TO SET FRAMES PER BURST
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def get_n_frames_per_burst():
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n_frames_per_burst = randrange(1,5)
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n_frames_per_burst = randrange(1,5)
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return n_frames_per_burst
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