def publish(self, topic, payload, qos, retain=False):
future = Future()
packet_id = 0
def puback(packet_id):
future.set_result(dict(packet_id=packet_id))
try:
packet_id = _awscrt.mqtt_client_connection_publish(
self._binding, topic, payload, qos.value, retain, puback)
except Exception as e:
future.set_exception(e)
return future, packet_id
def publish(self, topic, payload, qos, retain=False):
"""Publish message (async).
If the device is offline, the PUBLISH packet will be sent once the connection resumes.
Args:
topic (str): Topic name.
payload (buffer): Contents of message.
qos (QoS): Quality of Service for delivering this message.
retain (bool): If True, the server will store the message and its QoS
so that it can be delivered to future subscribers whose subscriptions
match its topic name.
Returns:
Tuple[concurrent.futures.Future, int]: Tuple containing a Future and
the ID of the PUBLISH packet. The QoS determines when the Future completes:
* For QoS 0, completes as soon as the packet is sent.
* For QoS 1, completes when PUBACK is received.
* For QoS 2, completes when PUBCOMP is received.
If successful, the Future will contain a dict with the following members:
* ['packet_id'] (int): ID of the PUBLISH packet that is complete.
"""
future = Future()
packet_id = 0
def puback(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_publish(
self._binding, topic, payload, qos.value, retain, puback)
except Exception as e:
future.set_exception(e)
return future, packet_id