Ebyte NB144E User Manual

Chengdu Ebyte Electronic Technology Co., Ltd. NB144E User ManualCopyright ©2012，Chengdu Ebyte Electronic Technology Co., Ltd. 24}server address: ProductKey . iot-as-mqtt.cn-shanghai.aliyuncs.com:1883pic for subscription and publishing : /a1GlhuTU1yN/DEV04/user/1234Cloud MQTT platform communication test:4.5 Channel portrandom port:TCP client, UDP client, HTTP client, MQTT client can configure the local port as 0 (use random local port),server mode cannot use random port, otherwise the client cannot establish the connection correctly (device is notcorrectly configured) port listening).Using a random port connection can quickly re-establish the connection when the device is accidentallydisconnected from the server, preventing the server from rejecting the connection due to four waved incomplete. Itis recommended to use a random port in client mode.When the device configures the TCP client, HTTP client, and MQTT client mode at AT , it will automaticallyconfigure a random port, which can be canceled by customization.Static port:Device fixed port (factory default: 8 001-800 4 ), TCP server mode device listens to the configuration port,accepts the connection request from the client and establishes a connection for data communication, and TCP clientmode device fixed port initiates a connection request.