Subscribe causes hang on program exit #142
Description
When I subscribe to any channel and spend about >= 0.5s before calling unsubscribe_all() and stop, the program hangs at the end, requiring a keyboard interrupt to terminate. hanging_threads reports that Thread-Subscribe-0 is hung waiting for some request, but I'm not sure how to figure out what request it's waiting on (sorry, not very good with python).
Below is a small test demonstrating the problem, but in fact examples/native_threads/check.py also hangs. I'm running this on macOS Monterey 12.4 with Python 3.9.13, PubNub package 7.0.1 installed from pip.
publish_key = '...'
subscribe_key = '...'
from hanging_threads import start_monitoring
monitoring_thread = start_monitoring (seconds_frozen=5, test_interval=100)
import pubnub
from pubnub.pubnub import PNConfiguration, PubNub, SubscribeCallback
from pubnub.utils import PNStatusCategory
pnconfig = PNConfiguration()
pnconfig.publish_key = publish_key
pnconfig.subscribe_key = subscribe_key
pnconfig.uuid = 'some-uuid'
pubnub = PubNub (pnconfig)
pubnub.subscribe ().channels ('test-channel').execute ()
import time
time.sleep (0.5) # The length of sleep matters, apparently.
print ('done sleeping')
pubnub.unsubscribe_all ()
print ('unsubscribed')
pubnub.stop ()
print ('pubnub stopped')
# hangs here
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