FreeDATA/modem/arq_session_irs.py

242 lines
9.7 KiB
Python

import threading
import arq_session
import helpers
from modem_frametypes import FRAME_TYPE
from codec2 import FREEDV_MODE
from enum import Enum
import time
class IRS_State(Enum):
NEW = 0
OPEN_ACK_SENT = 1
INFO_ACK_SENT = 2
BURST_REPLY_SENT = 3
ENDED = 4
FAILED = 5
ABORTED = 6
class ARQSessionIRS(arq_session.ARQSession):
TIMEOUT_CONNECT = 55 #14.2
TIMEOUT_DATA = 60
STATE_TRANSITION = {
IRS_State.NEW: {
FRAME_TYPE.ARQ_SESSION_OPEN.value : 'send_open_ack',
FRAME_TYPE.ARQ_STOP.value: 'send_stop_ack'
},
IRS_State.OPEN_ACK_SENT: {
FRAME_TYPE.ARQ_SESSION_OPEN.value: 'send_open_ack',
FRAME_TYPE.ARQ_SESSION_INFO.value: 'send_info_ack',
FRAME_TYPE.ARQ_STOP.value: 'send_stop_ack'
},
IRS_State.INFO_ACK_SENT: {
FRAME_TYPE.ARQ_SESSION_INFO.value: 'send_info_ack',
FRAME_TYPE.ARQ_BURST_FRAME.value: 'receive_data',
FRAME_TYPE.ARQ_STOP.value: 'send_stop_ack'
},
IRS_State.BURST_REPLY_SENT: {
FRAME_TYPE.ARQ_BURST_FRAME.value: 'receive_data',
FRAME_TYPE.ARQ_STOP.value: 'send_stop_ack'
},
IRS_State.ENDED: {
FRAME_TYPE.ARQ_BURST_FRAME.value: 'receive_data',
FRAME_TYPE.ARQ_STOP.value: 'send_stop_ack'
},
IRS_State.FAILED: {
FRAME_TYPE.ARQ_BURST_FRAME.value: 'receive_data',
FRAME_TYPE.ARQ_STOP.value: 'send_stop_ack'
},
IRS_State.ABORTED: {
FRAME_TYPE.ARQ_STOP.value: 'send_stop_ack',
FRAME_TYPE.ARQ_SESSION_OPEN.value: 'send_open_ack',
FRAME_TYPE.ARQ_SESSION_INFO.value: 'send_info_ack',
FRAME_TYPE.ARQ_BURST_FRAME.value: 'receive_data',
},
}
def __init__(self, config: dict, modem, dxcall: str, session_id: int):
super().__init__(config, modem, dxcall)
self.id = session_id
self.dxcall = dxcall
self.version = 1
self.state = IRS_State.NEW
self.state_enum = IRS_State # needed for access State enum from outside
self.type_byte = None
self.total_length = 0
self.total_crc = ''
self.received_data = None
self.received_bytes = 0
self.received_crc = None
self.transmitted_acks = 0
self.abort = False
def set_decode_mode(self):
self.modem.demodulator.set_decode_mode(self.get_mode_by_speed_level(self.speed_level))
def all_data_received(self):
return self.total_length == self.received_bytes
def final_crc_matches(self) -> bool:
match = self.total_crc == helpers.get_crc_32(bytes(self.received_data)).hex()
return match
def transmit_and_wait(self, frame, timeout, mode):
self.event_frame_received.clear()
self.transmit_frame(frame, mode)
self.log(f"Waiting {timeout} seconds...")
if not self.event_frame_received.wait(timeout):
self.log("Timeout waiting for ISS. Session failed.")
self.transmission_failed()
def launch_transmit_and_wait(self, frame, timeout, mode):
thread_wait = threading.Thread(target = self.transmit_and_wait,
args = [frame, timeout, mode], daemon=True)
thread_wait.start()
def send_open_ack(self, open_frame):
self.event_manager.send_arq_session_new(
False, self.id, self.dxcall, 0, self.state.name)
ack_frame = self.frame_factory.build_arq_session_open_ack(
self.id,
self.dxcall,
self.version,
self.snr[0], flag_abort=self.abort)
self.launch_transmit_and_wait(ack_frame, self.TIMEOUT_CONNECT, mode=FREEDV_MODE.signalling)
if not self.abort:
self.set_state(IRS_State.OPEN_ACK_SENT)
return None, None
def send_info_ack(self, info_frame):
# Get session info from ISS
self.received_data = bytearray(info_frame['total_length'])
self.total_length = info_frame['total_length']
self.total_crc = info_frame['total_crc']
self.dx_snr.append(info_frame['snr'])
self.type_byte = info_frame['type']
self.log(f"New transfer of {self.total_length} bytes")
self.event_manager.send_arq_session_new(False, self.id, self.dxcall, self.total_length, self.state.name)
self.calibrate_speed_settings()
self.set_decode_mode()
info_ack = self.frame_factory.build_arq_session_info_ack(
self.id, self.total_crc, self.snr[0],
self.speed_level, self.frames_per_burst, flag_abort=self.abort)
self.launch_transmit_and_wait(info_ack, self.TIMEOUT_CONNECT, mode=FREEDV_MODE.signalling)
if not self.abort:
self.set_state(IRS_State.INFO_ACK_SENT)
return None, None
def process_incoming_data(self, frame):
if frame['offset'] != self.received_bytes:
self.log(f"Discarding data offset {frame['offset']}")
return False
remaining_data_length = self.total_length - self.received_bytes
# Is this the last data part?
if remaining_data_length <= len(frame['data']):
# we only want the remaining length, not the entire frame data
data_part = frame['data'][:remaining_data_length]
else:
# we want the entire frame data
data_part = frame['data']
self.received_data[frame['offset']:] = data_part
self.received_bytes += len(data_part)
self.log(f"Received {self.received_bytes}/{self.total_length} bytes")
self.event_manager.send_arq_session_progress(
False, self.id, self.dxcall, self.received_bytes, self.total_length, self.state.name)
return True
def receive_data(self, burst_frame):
self.process_incoming_data(burst_frame)
self.calibrate_speed_settings()
if not self.all_data_received():
ack = self.frame_factory.build_arq_burst_ack(
self.id, self.received_bytes,
self.speed_level, self.frames_per_burst, self.snr[0], flag_abort=self.abort)
self.set_decode_mode()
# increase ack counter
# self.transmitted_acks += 1
self.set_state(IRS_State.BURST_REPLY_SENT)
self.launch_transmit_and_wait(ack, self.TIMEOUT_DATA, mode=FREEDV_MODE.signalling)
return None, None
if self.final_crc_matches():
self.log("All data received successfully!")
ack = self.frame_factory.build_arq_burst_ack(self.id,
self.received_bytes,
self.speed_level,
self.frames_per_burst,
self.snr[0],
flag_final=True,
flag_checksum=True)
self.transmit_frame(ack, mode=FREEDV_MODE.signalling)
self.log("ACK sent")
self.session_ended = time.time()
self.set_state(IRS_State.ENDED)
self.event_manager.send_arq_session_finished(
False, self.id, self.dxcall, True, self.state.name, data=self.received_data, statistics=self.calculate_session_statistics())
return self.received_data, self.type_byte
else:
ack = self.frame_factory.build_arq_burst_ack(self.id,
self.received_bytes,
self.speed_level,
self.frames_per_burst,
self.snr[0],
flag_final=True,
flag_checksum=False)
self.transmit_frame(ack, mode=FREEDV_MODE.signalling)
self.log("CRC fail at the end of transmission!")
self.transmission_failed()
def calibrate_speed_settings(self):
self.speed_level = 0 # for now stay at lowest speed level
return
# if we have two ACKS, then consider increasing speed level
if self.transmitted_acks >= 2:
self.transmitted_acks = 0
new_speed_level = min(self.speed_level + 1, len(self.SPEED_LEVEL_DICT) - 1)
# check first if the next mode supports the actual snr
if self.snr[0] >= self.SPEED_LEVEL_DICT[new_speed_level]["min_snr"]:
self.speed_level = new_speed_level
def abort_transmission(self):
self.log(f"Aborting transmission... setting abort flag")
self.abort = True
def send_stop_ack(self, stop_frame):
stop_ack = self.frame_factory.build_arq_stop_ack(self.id)
self.launch_transmit_and_wait(stop_ack, self.TIMEOUT_CONNECT, mode=FREEDV_MODE.signalling)
self.set_state(IRS_State.ABORTED)
self.event_manager.send_arq_session_finished(
False, self.id, self.dxcall, False, self.state.name, statistics=self.calculate_session_statistics())
return None, None
def transmission_failed(self, irs_frame=None):
# final function for failed transmissions
self.session_ended = time.time()
self.set_state(IRS_State.FAILED)
self.log(f"Transmission failed!")
self.event_manager.send_arq_session_finished(True, self.id, self.dxcall,False, self.state.name, statistics=self.calculate_session_statistics())
self.states.setARQ(False)
return None, None