An error occurs if the heartbeat_period parameter is set：
File "/home/web/.py3env/lib/python3.6/site-packages/apns2-0.4.1-py3.6.egg/apns2/client.py", line 179, in send_notification_batch
result = self.get_notification_result(pending_stream.stream_id)
File "/home/web/.py3env/lib/python3.6/site-packages/apns2-0.4.1-py3.6.egg/apns2/client.py", line 122, in get_notification_result
with self._connection.get_response(stream_id) as response:
File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/connection.py", line 312, in get_response
return HTTP20Response(stream.getheaders(), stream)
File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/stream.py", line 230, in getheaders
self._recv_cb(stream_id=self.stream_id)
File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/connection.py", line 771, in _recv_cb
self._single_read()
File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/connection.py", line 665, in _single_read
self._sock.fill()
File "/home/web/.py3env/lib/python3.6/site-packages/hyper/common/bufsocket.py", line 167, in fill
count = self._sck.recv_into(self._buffer_view[self._buffer_end:])
File "/home/web/.py3env/lib/python3.6/site-packages/gevent/_ssl3.py", line 503, in recv_into
return self.read(nbytes, buffer)
File "/home/web/.py3env/lib/python3.6/site-packages/gevent/_ssl3.py", line 332, in read
self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout)
File "src/gevent/_hub_primitives.py", line 265, in gevent.__hub_primitives.wait_on_socket
File "src/gevent/_hub_primitives.py", line 266, in gevent.__hub_primitives.wait_on_socket
File "src/gevent/_hub_primitives.py", line 252, in gevent.__hub_primitives._primitive_wait
File "src/gevent/_hub_primitives.py", line 46, in gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_hub_primitives.py", line 46, in gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_hub_primitives.py", line 55, in gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_waiter.py", line 151, in gevent.__waiter.Waiter.get
File "src/gevent/_greenlet_primitives.py", line 59, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/_greenlet_primitives.py", line 59, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/_greenlet_primitives.py", line 63, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/__greenlet_primitives.pxd", line 35, in gevent.__greenlet_primitives._greenlet_switch
greenlet.error: cannot switch to a different thread
An error occurs if the heartbeat_period parameter is set：
File "/home/web/.py3env/lib/python3.6/site-packages/apns2-0.4.1-py3.6.egg/apns2/client.py", line 179, in send_notification_batch result = self.get_notification_result(pending_stream.stream_id) File "/home/web/.py3env/lib/python3.6/site-packages/apns2-0.4.1-py3.6.egg/apns2/client.py", line 122, in get_notification_result with self._connection.get_response(stream_id) as response: File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/connection.py", line 312, in get_response return HTTP20Response(stream.getheaders(), stream) File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/stream.py", line 230, in getheaders self._recv_cb(stream_id=self.stream_id) File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/connection.py", line 771, in _recv_cb self._single_read() File "/home/web/.py3env/lib/python3.6/site-packages/hyper/http20/connection.py", line 665, in _single_read self._sock.fill() File "/home/web/.py3env/lib/python3.6/site-packages/hyper/common/bufsocket.py", line 167, in fill count = self._sck.recv_into(self._buffer_view[self._buffer_end:]) File "/home/web/.py3env/lib/python3.6/site-packages/gevent/_ssl3.py", line 503, in recv_into return self.read(nbytes, buffer) File "/home/web/.py3env/lib/python3.6/site-packages/gevent/_ssl3.py", line 332, in read self._wait(self._read_event, timeout_exc=_SSLErrorReadTimeout) File "src/gevent/_hub_primitives.py", line 265, in gevent.__hub_primitives.wait_on_socket
File "src/gevent/_hub_primitives.py", line 266, in gevent.__hub_primitives.wait_on_socket
File "src/gevent/_hub_primitives.py", line 252, in gevent.__hub_primitives._primitive_wait
File "src/gevent/_hub_primitives.py", line 46, in gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_hub_primitives.py", line 46, in gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_hub_primitives.py", line 55, in gevent.__hub_primitives.WaitOperationsGreenlet.wait
File "src/gevent/_waiter.py", line 151, in gevent.__waiter.Waiter.get
File "src/gevent/_greenlet_primitives.py", line 59, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/_greenlet_primitives.py", line 59, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/_greenlet_primitives.py", line 63, in gevent.__greenlet_primitives.SwitchOutGreenletWithLoop.switch
File "src/gevent/__greenlet_primitives.pxd", line 35, in gevent.__greenlet_primitives._greenlet_switch
greenlet.error: cannot switch to a different thread