Mqtt.
10240000 max_conn_rate = 1000 } } Test with a Client Test the Publish/Subscribe with the MQTT-SN client written in C, for example: Client ID mqttsn1 connects and subscribes to the topic t/a， $ ./mqtt-sn-sub -i mqttsn1 -t t/a -p 1884 -d Log in the MQTT-SN gateway with the Client ID mqttsn2 , and