GsmtapListener.stop() closed the UDP socket permanently, but start()
only set _running=True without recreating it. Second capture session
would silently spin on the dead socket (OSError → None → continue).
- Add _closed flag to GsmtapReceiver, set in close()
- Store bind_port in GsmtapListener for socket recreation
- start() recreates GsmtapReceiver only if previous one was closed
- Uses getattr for backward compat with test fakes
catarrh
7d8dca1ffd