- APRSDRXThread: Replace time.sleep with self.wait for interruptible waits
- APRSDRXThread.stop(): Use _shutdown_event.set() instead of thread_stop
- APRSDRXThread: Error recovery waits check for shutdown signal
- APRSDFilterThread: Use queue timeout with self.period for interruptible wait
- Remove unused time import
- Update tests to use new Event-based API
- Add daemon=True class attribute (subclasses override to False)
- Add period=1 class attribute for wait interval
- Replace thread_stop boolean with _shutdown_event (threading.Event)
- Add wait() method for interruptible sleeps
- Update tests for new Event-based API
BREAKING: thread_stop boolean replaced with _shutdown_event.
Code checking thread.thread_stop directly must use thread._shutdown_event.is_set()
The Main RX Thread that runs the client.consumer() call used to
parse packets as soon as it got them. This lead to an iffecient
strategy for listen and acquire packets as fast as possible.
The APRSDRXThread now gets the raw packet from the client and
shoves it on the packet_queue. The other threads that are looking
for packets on the packet_queue will parse the raw packet with
aprslib. This allows us to capture packets as quickly as we can,
and then process those packets in the secondary threads.
This prevents a bottleneck capturing packets.
