FreeDATA/modem/frame_handler_arq_session.py

58 lines
2.1 KiB
Python

from queue import Queue
import frame_handler
from event_manager import EventManager
from state_manager import StateManager
from modem_frametypes import FRAME_TYPE as FR
from arq_session_irs import ARQSessionIRS
from arq_session_iss import ARQSessionISS
class ARQFrameHandler(frame_handler.FrameHandler):
def follow_protocol(self):
if not self.should_respond():
return
frame = self.details['frame']
session_id = frame['session_id']
snr = self.details["snr"]
frequency_offset = self.details["frequency_offset"]
if frame['frame_type_int'] == FR.ARQ_SESSION_OPEN.value:
# Lost OPEN_ACK case .. ISS will retry opening a session
if session_id in self.states.arq_irs_sessions:
session = self.states.arq_irs_sessions[session_id]
# Normal case when receiving a SESSION_OPEN for the first time
else:
if self.states.check_if_running_arq_session():
self.logger.warning("DISCARDING SESSION OPEN because of ongoing ARQ session ", frame=frame)
return
session = ARQSessionIRS(self.config,
self.modem,
frame['origin'],
session_id)
self.states.register_arq_irs_session(session)
elif frame['frame_type_int'] in [
FR.ARQ_SESSION_INFO.value,
FR.ARQ_BURST_FRAME.value,
FR.ARQ_STOP.value,
]:
session = self.states.get_arq_irs_session(session_id)
elif frame['frame_type_int'] in [
FR.ARQ_SESSION_OPEN_ACK.value,
FR.ARQ_SESSION_INFO_ACK.value,
FR.ARQ_BURST_ACK.value,
FR.ARQ_STOP_ACK.value
]:
session = self.states.get_arq_iss_session(session_id)
else:
self.logger.warning("DISCARDING FRAME", frame=frame)
return
session.set_details(snr, frequency_offset)
session.on_frame_received(frame)