def unsubscribe(self, topic):
"""Unsubscribe from a topic filter (async).
The client sends an UNSUBSCRIBE packet, and the server responds with an UNSUBACK.
Args:
topic (str): Unsubscribe from this topic filter.
Returns:
Tuple[concurrent.futures.Future, int]: Tuple containing a Future and
the ID of the UNSUBSCRIBE packet. The Future completes when an
UNSUBACK is received from the server. If successful, the Future
will contain a dict with the following members:
* ['packet_id'] (int): ID of the UNSUBSCRIBE packet being acknowledged.
"""
future = Future()
packet_id = 0
def unsuback(packet_id, error_code):
if error_code != 0:
future.set_exception(awscrt.exceptions.from_code(error_code))
else:
future.set_result(dict(packet_id=packet_id))
try:
packet_id = _awscrt.mqtt_client_connection_unsubscribe(
self._binding, topic, unsuback)
except Exception as e:
future.set_exception(e)
return future, packet_id
def unsubscribe(self, topic):
future = Future()
packet_id = 0
def unsuback(packet_id):
future.set_result(dict(packet_id=packet_id))
try:
packet_id = _awscrt.mqtt_client_connection_unsubscribe(
self._binding, topic, unsuback)
except Exception as e:
future.set_exception(e)
return future, packet_id