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Yes, both Moquette and EMQX brokers support QoS 2 for clients connected directly to the broker. Please note that IoT Core does not support QoS 2.
answered a year ago
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When I use awscrt.mqtt.Connection to Greengrass Moquette component: future, id = connection.publish(topic, message, QoS.EXACTLY_ONCE) future.result() return ValueError in both IoT Core and Greengrass core cases:
File "/usr/lib64/python3.7/concurrent/futures/_base.py", line 428, in result return self.__get_result() File "/usr/lib64/python3.7/concurrent/futures/_base.py", line 384, in __get_result raise self._exception File "/home/ec2-user/.local/lib/python3.7/site-packages/awscrt/mqtt.py", line 700, in publish packet_id = _awscrt.mqtt_client_connection_publish(self._binding, topic, payload, qos.value, retain, puback) ValueError