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FreeDATA/modem/protocol_arq_session_iss.py

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Python
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import sys
import threading
import time
import lzma
from random import randrange
import hmac
import hashlib
import helpers
import modem
import numpy as np
from codec2 import FREEDV_MODE
from modem_frametypes import FRAME_TYPE as FR_TYPE
import event_manager
from protocol_arq_session import ARQ
class ISS(ARQ):
def __init__(self, config, event_queue, states):
super().__init__(config, event_queue, states)
self.tx_n_max_retries_per_burst = 40
self.datachannel_opening_interval = self.duration_sig1_frame + self.channel_busy_timeout + 1 # time between attempts when opening data channel
self.irs_buffer_position = 0
# actual n retries of burst
self.tx_n_retry_of_burst = 0
self.burst_ack_snr = 0 # SNR from received burst ack frames
def arq_transmit(self, data_out: bytes, hmac_salt: bytes):
"""
Transmit ARQ frame
Args:
data_out:bytes:
"""
# set signalling modes we want to listen to
# we are in an ongoing arq transmission, so we don't need sig0 actually
modem.demodulator.RECEIVE_SIG0 = False
modem.demodulator.RECEIVE_SIG1 = True
self.tx_n_retry_of_burst = 0 # retries we already sent data
# Maximum number of retries to send before declaring a frame is lost
# save len of data_out to TOTAL_BYTES for our statistics
self.states.set("arq_total_bytes", len(data_out))
self.arq_file_transfer = True
frame_total_size = len(data_out).to_bytes(4, byteorder="big")
# Compress data frame
data_frame_compressed = lzma.compress(data_out)
compression_factor = len(data_out) / len(data_frame_compressed)
self.arq_compression_factor = np.clip(compression_factor, 0, 255)
compression_factor = bytes([int(self.arq_compression_factor * 10)])
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
finished=self.states.arq_seconds_until_finish,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS)
)
self.log.info(
"[Modem] | TX | DATACHANNEL",
Bytes=self.states.arq_total_bytes,
)
data_out = data_frame_compressed
# Reset data transfer statistics
tx_start_of_transmission = time.time()
self.calculate_transfer_rate_tx(tx_start_of_transmission, 0, len(data_out))
# check if hmac signature is available
if hmac_salt not in ['', False]:
print(data_out)
# create hmac digest
hmac_digest = hmac.new(hmac_salt, data_out, hashlib.sha256).digest()
# truncate to 32bit
frame_payload_crc = hmac_digest[:4]
self.log.debug("[Modem] frame payload HMAC:", crc=frame_payload_crc.hex())
else:
# Append a crc at the beginning and end of file indicators
frame_payload_crc = helpers.get_crc_32(data_out)
self.log.debug("[Modem] frame payload CRC:", crc=frame_payload_crc.hex())
# Assemble the data frame
data_out = (
self.data_frame_bof
+ frame_payload_crc
+ frame_total_size
+ compression_factor
+ data_out
+ self.data_frame_eof
)
self.log.debug("[Modem] frame raw data:", data=data_out)
# Initial bufferposition is 0
bufferposition = 0
bufferposition_end = 0
bufferposition_burst_start = 0
# Iterate through data_out buffer
while not self.data_frame_ack_received and self.states.is_arq_state:
# we have self.tx_n_max_retries_per_burst attempts for sending a burst
for self.tx_n_retry_of_burst in range(self.tx_n_max_retries_per_burst):
# Bound speed level to:
# - minimum of either the speed or the length of mode list - 1
# - maximum of either the speed or zero
self.speed_level = min(self.speed_level, len(self.mode_list) - 1)
self.speed_level = max(self.speed_level, 0)
self.states.set("arq_speed_level", self.speed_level)
data_mode = self.mode_list[self.speed_level]
self.log.debug(
"[Modem] Speed-level:",
level=self.speed_level,
retry=self.tx_n_retry_of_burst,
mode=FREEDV_MODE(data_mode).name,
)
# Payload information
payload_per_frame = modem.get_bytes_per_frame(data_mode) - 2
self.log.info("[Modem] early buffer info",
bufferposition=bufferposition,
bufferposition_end=bufferposition_end,
bufferposition_burst_start=bufferposition_burst_start
)
# check for maximum frames per burst for remaining data
n_frames_per_burst = 1
if self.max_n_frames_per_burst > 1:
while (payload_per_frame * n_frames_per_burst) % len(data_out[bufferposition_burst_start:]) == (
payload_per_frame * n_frames_per_burst):
threading.Event().wait(0.01)
# print((payload_per_frame * n_frames_per_burst) % len(data_out))
n_frames_per_burst += 1
if n_frames_per_burst == self.max_n_frames_per_burst:
break
else:
n_frames_per_burst = 1
self.log.info("[Modem] calculated frames_per_burst:", n=n_frames_per_burst)
tempbuffer = []
self.rpt_request_buffer = []
# Append data frames with n_frames_per_burst to tempbuffer
for n_frame in range(n_frames_per_burst):
arqheader = bytearray()
arqheader[:1] = bytes([FR_TYPE.BURST_01.value + n_frame])
#####arqheader[:1] = bytes([FR_TYPE.BURST_01.value])
arqheader[1:2] = bytes([n_frames_per_burst])
arqheader[2:3] = self.session_id
# only check for buffer position if at least one NACK received
self.log.info("[Modem] ----- data buffer position:", iss_buffer_pos=bufferposition,
irs_bufferposition=self.irs_buffer_position)
if self.frame_nack_counter > 0 and self.irs_buffer_position != bufferposition:
self.log.error("[Modem] ----- data buffer offset:", iss_buffer_pos=bufferposition,
irs_bufferposition=self.irs_buffer_position)
# only adjust buffer position for experimental versions
if self.enable_experimental_features:
self.log.warning("[Modem] ----- data adjustment enabled!")
bufferposition = self.irs_buffer_position
bufferposition_end = bufferposition + payload_per_frame - len(arqheader)
# Normal condition
if bufferposition_end <= len(data_out):
frame = data_out[bufferposition:bufferposition_end]
frame = arqheader + frame
# Pad the last bytes of a frame
else:
extended_data_out = data_out[bufferposition:]
extended_data_out += bytes([0]) * (
payload_per_frame - len(extended_data_out) - len(arqheader)
)
frame = arqheader + extended_data_out
######tempbuffer = frame # [frame]
tempbuffer.append(frame)
# add data to our repeat request buffer for easy access if we received a request
self.rpt_request_buffer.append(frame)
# set new buffer position
bufferposition = bufferposition_end
self.log.debug("[Modem] tempbuffer:", tempbuffer=tempbuffer)
self.log.info(
"[Modem] ARQ | TX | FRAMES",
mode=FREEDV_MODE(data_mode).name,
fpb=n_frames_per_burst,
retry=self.tx_n_retry_of_burst,
)
self.enqueue_frame_for_tx(tempbuffer, c2_mode=data_mode)
# After transmission finished, wait for an ACK or RPT frame
while (
self.states.is_arq_state
and not self.burst_ack
and not self.burst_nack
and not self.rpt_request_received
and not self.data_frame_ack_received
):
threading.Event().wait(0.01)
# Once we receive a burst ack, reset its state and break the RETRIES loop
if self.burst_ack:
self.burst_ack = False # reset ack state
self.tx_n_retry_of_burst = 0 # reset retries
self.log.debug(
"[Modem] arq_transmit: Received BURST ACK. Sending next chunk."
, irs_snr=self.burst_ack_snr)
# update temp bufferposition for n frames per burst early calculation
bufferposition_burst_start = bufferposition_end
break # break retry loop
if self.data_frame_ack_received:
self.log.debug(
"[Modem] arq_transmit: Received FRAME ACK. Braking retry loop."
)
break # break retry loop
if self.burst_nack:
self.tx_n_retry_of_burst += 1
self.log.warning(
"[Modem] arq_transmit: Received BURST NACK. Resending data",
bufferposition_burst_start=bufferposition_burst_start,
bufferposition=bufferposition
)
bufferposition = bufferposition_burst_start
self.burst_nack = False # reset nack state
# We need this part for leaving the repeat loop
# self.states.is_arq_state == "DATA" --> when stopping transmission manually
if not self.states.is_arq_state:
self.log.debug(
"[Modem] arq_transmit: ARQ State changed to FALSE. Breaking retry loop."
)
break
self.calculate_transfer_rate_tx(
tx_start_of_transmission, bufferposition_end, len(data_out)
)
# NEXT ATTEMPT
self.log.debug(
"[Modem] ATTEMPT:",
retry=self.tx_n_retry_of_burst,
maxretries=self.tx_n_max_retries_per_burst,
)
# update buffer position
bufferposition = bufferposition_end
# update stats
self.calculate_transfer_rate_tx(
tx_start_of_transmission, bufferposition_end, len(data_out)
)
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="transmitting",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
finished=self.states.arq_seconds_until_finish,
irs_snr=self.burst_ack_snr,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS)
)
# Stay in the while loop until we receive a data_frame_ack. Otherwise,
# the loop exits after sending the last frame only once and doesn't
# wait for an acknowledgement.
if self.data_frame_ack_received and bufferposition > len(data_out):
self.log.debug("[Modem] arq_tx: Last fragment sent and acknowledged.")
break
# GOING TO NEXT ITERATION
if self.data_frame_ack_received:
self.arq_transmit_success()
else:
self.arq_transmit_failed()
if TESTMODE:
# Quit after transmission
self.log.debug("[Modem] TESTMODE: arq_transmit exiting.")
sys.exit(0)
def arq_transmit_success(self):
"""
will be called if we successfully transmitted all of queued data
"""
# we need to wait until sending "transmitted" state
# gui database is too slow for handling this within 0.001 seconds
# so let's sleep a little
threading.Event().wait(0.2)
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="transmitted",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
finished=self.states.arq_seconds_until_finish,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS),
nacks=self.frame_nack_counter,
speed_list=self.states.arq_speed_list
)
self.log.info(
"[Modem] ARQ | TX | DATA TRANSMITTED!",
BytesPerMinute=self.states.arq_bytes_per_minute,
total_bytes=self.states.arq_total_bytes,
BitsPerSecond=self.states.arq_bits_per_second,
)
# finally do an arq cleanup
self.arq_cleanup()
def arq_transmit_failed(self):
"""
will be called if we not successfully transmitted all of queued data
"""
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS),
nacks=self.frame_nack_counter,
speed_list=self.states.arq_speed_list
)
self.log.info(
"[Modem] ARQ | TX | TRANSMISSION FAILED OR TIME OUT!")
self.stop_transmission()
def burst_ack_nack_received(self, data_in: bytes, snr) -> None:
"""
Received an ACK/NACK for a transmitted frame, keep track and
make adjustments to speed level if needed.
Args:
data_in:bytes:
Returns:
"""
# Process data only if we are in ARQ and BUSY state
if self.states.is_arq_state:
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
frametype = int.from_bytes(bytes(data_in[:1]), "big")
if frametype == FR_TYPE.BURST_ACK.value:
# Increase speed level if we received a burst ack
# self.speed_level = min(self.speed_level + 1, len(self.mode_list) - 1)
# Force data retry loops of TX Modem to stop and continue with next frame
self.burst_ack = True
# Reset burst nack counter
self.burst_nack_counter = 0
# Reset n retries per burst counter
self.n_retries_per_burst = 0
self.irs_buffer_position = int.from_bytes(data_in[4:8], "big")
self.burst_ack_snr = helpers.snr_from_bytes(data_in[2:3])
else:
# Decrease speed level if we received a burst nack
# self.speed_level = max(self.speed_level - 1, 0)
# Set flag to retry frame again.
self.burst_nack = True
# Increment burst nack counter
self.burst_nack_counter += 1
self.burst_ack_snr = 'NaN'
self.irs_buffer_position = int.from_bytes(data_in[5:9], "big")
self.log.warning(
"[Modem] ARQ | TX | Burst NACK received",
burst_nack_counter=self.burst_nack_counter,
irs_buffer_position=self.irs_buffer_position,
)
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
# self.burst_ack_snr = int.from_bytes(bytes(data_in[2:3]), "big")
self.burst_ack_snr = helpers.snr_from_bytes(data_in[2:3])
# self.log.info("SNR ON IRS", snr=self.burst_ack_snr)
self.speed_level = int.from_bytes(bytes(data_in[3:4]), "big")
self.states.set("arq_speed_level", self.speed_level)
def frame_ack_received(
self, data_in: bytes, snr # pylint: disable=unused-argument,
) -> None:
"""Received an ACK for a transmitted frame"""
# Process data only if we are in ARQ and BUSY state
if self.states.is_arq_state:
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
# Force data loops of Modem to stop and continue with next frame
self.data_frame_ack_received = True
# Update arq_session and data_channel timestamp
self.data_channel_last_received = int(time.time())
self.arq_session_last_received = int(time.time())
def frame_nack_received(
self, data_in: bytes, snr # pylint: disable=unused-argument
) -> None:
"""
Received a NACK for a transmitted frame
Args:
data_in:bytes:
"""
self.log.warning("[Modem] ARQ FRAME NACK RECEIVED - cleanup!",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS),
nacks=self.frame_nack_counter,
speed_list=self.states.arq_speed_list
)
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="failed",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS),
nacks=self.frame_nack_counter,
speed_list=self.states.arq_speed_list
)
# Update data_channel timestamp
self.arq_session_last_received = int(time.time())
self.arq_cleanup()
def burst_rpt_received(self, data_in: bytes, snr):
"""
Repeat request frame received for transmitted frame
Args:
data_in:bytes:
"""
# Only process data if we are in ARQ and BUSY state
if not self.states.is_arq_state or not self.states.is_modem_busy:
return
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.log.info("[Modem] ARQ REPEAT RECEIVED")
# self.rpt_request_received = True
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
# self.rpt_request_buffer = []
missing_area = bytes(data_in[2:12]) # 1:9
missing_area = missing_area.strip(b"\x00")
print(missing_area)
print(self.rpt_request_buffer)
tempbuffer_rptframes = []
for i in range(len(missing_area)):
print(missing_area[i])
missing_frames_buffer_position = missing_area[i] - 1
tempbuffer_rptframes.append(self.rpt_request_buffer[missing_frames_buffer_position])
self.log.info("[Modem] SENDING REPEAT....")
data_mode = self.mode_list[self.speed_level]
self.enqueue_frame_for_tx(tempbuffer_rptframes, c2_mode=data_mode)
############################################################################################################
# ARQ SESSION HANDLER
############################################################################################################
def arq_session_handler(self, mycallsign, dxcallsign) -> bool:
"""
Create a session with `self.dxcallsign` and wait until the session is open.
Returns:
True if the session was opened successfully
False if the session open request failed
"""
encoded_call = helpers.callsign_to_bytes(mycallsign)
mycallsign = helpers.bytes_to_callsign(encoded_call)
encoded_call = helpers.callsign_to_bytes(dxcallsign)
dxcallsign = helpers.bytes_to_callsign(encoded_call)
self.states.set("dxcallsign", dxcallsign)
dxcallsign_crc = helpers.get_crc_24(dxcallsign)
self.log.info(
"[Modem] SESSION ["
+ str(mycallsign, "UTF-8")
+ "]>> <<["
+ str(dxcallsign, "UTF-8")
+ "]",
self.states.arq_session_state,
)
# wait if we have a channel busy condition
if self.states.channel_busy:
self.channel_busy_handler()
self.open_session()
# wait until data channel is open
while not self.states.is_arq_session and not self.arq_session_timeout:
threading.Event().wait(0.01)
self.states.set("arq_session_state", "connecting")
self.event_manager.send_custom_event(
freedata="modem-message",
arq="session",
status="connecting",
mycallsign=str(mycallsign, 'UTF-8'),
dxcallsign=str(dxcallsign, 'UTF-8'),
)
if self.states.is_arq_session and self.states.arq_session_state == "connected":
# self.states.set("arq_session_state", "connected")
self.event_manager.send_custom_event(
freedata="modem-message",
arq="session",
status="connected",
mycallsign=str(mycallsign, 'UTF-8'),
dxcallsign=str(dxcallsign, 'UTF-8'),
)
return True
self.log.warning(
"[Modem] SESSION FAILED ["
+ str(mycallsign, "UTF-8")
+ "]>>X<<["
+ str(dxcallsign, "UTF-8")
+ "]",
attempts=self.session_connect_max_retries, # Adjust for 0-based for user display
reason="maximum connection attempts reached",
state=self.states.arq_session_state,
)
self.states.set("arq_session_state", "failed")
self.event_manager.send_custom_event(
freedata="modem-message",
arq="session",
status="failed",
reason="timeout",
mycallsign=str(mycallsign, 'UTF-8'),
dxcallsign=str(dxcallsign, 'UTF-8'),
)
return False
def open_dc_and_transmit(
self,
data_out: bytes,
transmission_uuid: str,
mycallsign,
dxcallsign,
) -> bool:
"""
Open data channel and transmit data
Args:
data_out:bytes:
transmission_uuid:str:
mycallsign:bytes:
Returns:
True if the data session was opened and the data was sent
False if the data session was not opened
"""
self.mycallsign = mycallsign
# additional step for being sure our callsign is correctly
# in case we are not getting a station ssid
# then we are forcing a station ssid = 0
if not self.states.is_arq_session:
dxcallsign = helpers.callsign_to_bytes(dxcallsign)
dxcallsign = helpers.bytes_to_callsign(dxcallsign)
self.dxcallsign = dxcallsign
self.dxcallsign_crc = helpers.get_crc_24(self.dxcallsign)
# check if hmac hash is provided
try:
self.log.info("[SCK] [HMAC] Looking for salt/token", local=mycallsign, remote=dxcallsign)
hmac_salt = helpers.get_hmac_salt(dxcallsign, mycallsign)
self.log.info("[SCK] [HMAC] Salt info", local=mycallsign, remote=dxcallsign, salt=hmac_salt)
except Exception:
self.log.warning("[SCK] [HMAC] No salt/token found")
hmac_salt = ''
self.states.set("is_modem_busy", True)
self.arq_file_transfer = True
self.beacon_paused = True
self.transmission_uuid = transmission_uuid
# wait a moment for the case, a heartbeat is already on the way back to us
# this makes channel establishment more clean
if self.states.is_arq_session:
threading.Event().wait(2.5)
# init arq state event
self.arq_state_event = threading.Event()
# finally start the channel opening procedure
self.arq_open_data_channel(mycallsign)
# if data channel is open, return true else false
if self.arq_state_event.is_set():
# start arq transmission
self.arq_transmit(data_out, hmac_salt)
return True
else:
self.log.debug(
"[Modem] arq_open_data_channel:", transmission_uuid=self.transmission_uuid
)
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="failed",
reason="unknown",
uuid=self.transmission_uuid,
percent=self.states.arq_transmission_percent,
bytesperminute=self.states.arq_bytes_per_minute,
compression=self.arq_compression_factor,
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS),
nacks=self.frame_nack_counter,
speed_list=self.states.arq_speed_list
)
self.log.warning(
"[Modem] ARQ | TX | DATA ["
+ str(mycallsign, "UTF-8")
+ "]>>X<<["
+ str(self.dxcallsign, "UTF-8")
+ "]"
)
# Attempt to clean up the far-side, if it received the
# open_session frame and can still hear us.
self.close_session()
# release beacon pause
self.beacon_paused = False
# otherwise return false
return False
def arq_open_data_channel(
self, mycallsign
) -> bool:
"""
Open an ARQ data channel.
Args:
mycallsign:bytes:
Returns:
True if the data channel was opened successfully
False if the data channel failed to open
"""
# set IRS indicator to false, because we are IRS
self.is_IRS = False
# init a new random session id if we are not in an arq session
if not self.states.is_arq_session:
self.session_id = np.random.bytes(1)
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
# check if the Modem is running in low bandwidth mode
# then set the corresponding frametype and build frame
if self.low_bandwidth_mode:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_N.value])
self.log.debug("[Modem] Requesting low bandwidth mode")
else:
frametype = bytes([FR_TYPE.ARQ_DC_OPEN_W.value])
self.log.debug("[Modem] Requesting high bandwidth mode")
# build connection frame
connection_frame = self.frame_factory.build_arq_connect(
session_id=self.session_id,
destination_crc=self.dxcallsign_crc,
)
for attempt in range(self.data_channel_max_retries):
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="opening",
mycallsign=mycallsign,
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS)
)
self.log.info(
"[Modem] ARQ | DATA | TX | ["
+ mycallsign
+ "]>> <<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
attempt=f"{str(attempt + 1)}/{str(self.data_channel_max_retries)}",
)
# Let's check if we have a busy channel and if we are not in a running arq session.
if self.states.channel_busy and not self.arq_state_event.is_set() or self.states.is_codec2_traffic:
self.channel_busy_handler()
# if channel free, enqueue frame for tx
if not self.arq_state_event.is_set():
self.enqueue_frame_for_tx([connection_frame], c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0)
# wait until timeout or event set
random_wait_time = randrange(int(self.duration_sig1_frame * 10),
int(self.datachannel_opening_interval * 10), 1) / 10
self.arq_state_event.wait(timeout=random_wait_time)
if self.arq_state_event.is_set():
return True
if not self.states.is_modem_busy:
return False
# `data_channel_max_retries` attempts have been sent. Aborting attempt & cleaning up
return False
def arq_received_channel_is_open(self, data_in: bytes, snr) -> None:
"""
Called if we received a data channel opener
Args:
data_in:bytes:
"""
protocol_version = int.from_bytes(bytes(data_in[13:14]), "big")
if protocol_version == self.arq_protocol_version:
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="opened",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS)
)
frametype = int.from_bytes(bytes(data_in[:1]), "big")
if frametype == FR_TYPE.ARQ_DC_OPEN_ACK_N.value:
self.received_LOW_BANDWIDTH_MODE = True
self.mode_list = self.mode_list_low_bw
self.time_list = self.time_list_low_bw
self.log.debug("[Modem] low bandwidth mode", modes=self.mode_list)
else:
self.received_LOW_BANDWIDTH_MODE = False
self.mode_list = self.mode_list_high_bw
self.time_list = self.time_list_high_bw
self.log.debug("[Modem] high bandwidth mode", modes=self.mode_list)
# set speed level from session opener frame delegation
self.speed_level = int.from_bytes(bytes(data_in[8:9]), "big")
self.log.debug("[Modem] speed level selected for given SNR", speed_level=self.speed_level)
self.dxgrid = b'------'
helpers.add_to_heard_stations(
self.dxcallsign,
self.dxgrid,
"DATA",
snr,
self.modem_frequency_offset,
self.states.radio_frequency,
self.states.heard_stations
)
self.log.info(
"[Modem] ARQ | DATA | TX | ["
+ str(self.mycallsign, "UTF-8")
+ "]>>|<<["
+ str(self.dxcallsign, "UTF-8")
+ "]",
snr=snr,
)
# as soon as we set ARQ_STATE to True, transmission starts
self.states.set("is_arq_state", True)
# also set the ARQ event
self.arq_state_event.set()
# Update data_channel timestamp
self.data_channel_last_received = int(time.time())
else:
self.event_manager.send_custom_event(
freedata="modem-message",
arq="transmission",
status="failed",
reason="protocol version missmatch",
mycallsign=str(self.mycallsign, 'UTF-8'),
dxcallsign=str(self.dxcallsign, 'UTF-8'),
irs=helpers.bool_to_string(self.is_IRS)
)
self.log.warning(
"[Modem] protocol version mismatch:",
received=protocol_version,
own=self.arq_protocol_version,
)
self.stop_transmission()
def calculate_transfer_rate_tx(
self, tx_start_of_transmission: float, sentbytes: int, tx_buffer_length: int
) -> list:
"""
Calculate transfer rate for transmission
Args:
tx_start_of_transmission:float:
sentbytes:int:
tx_buffer_length:int:
Returns: List of:
bits_per_second: float,
bytes_per_minute: float,
transmission_percent: float
"""
try:
arq_transmission_percent = min(
int((sentbytes / tx_buffer_length) * 100), 100
)
transmissiontime = time.time() - tx_start_of_transmission
if sentbytes > 0:
arq_bits_per_second = int((sentbytes * 8) / transmissiontime)
bytes_per_minute = int(sentbytes / (transmissiontime / 60))
arq_seconds_until_finish = int(((tx_buffer_length - sentbytes) / (
bytes_per_minute * self.arq_compression_factor)) * 60)
speed_chart = {"snr": self.burst_ack_snr, "bpm": bytes_per_minute,
"timestamp": int(time.time())}
# check if data already in list
if speed_chart not in self.states.arq_speed_list:
self.states.arq_speed_list.append(speed_chart)
else:
arq_bits_per_second = 0
bytes_per_minute = 0
arq_seconds_until_finish = 0
except Exception as err:
self.log.error(f"[Modem] calculate_transfer_rate_tx: Exception: {err}")
arq_transmission_percent = 0.0
arq_bits_per_second = 0
bytes_per_minute = 0
self.states.set("arq_bits_per_second", arq_bits_per_second)
self.states.set("bytes_per_minute", bytes_per_minute)
self.states.set("arq_transmission_percent", arq_transmission_percent)
self.states.set("arq_compression_factor", self.arq_compression_factor)
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