Introduction - If you have any usage issues, please Google them yourself
MQTT protocol is a protocol designed for large amounts of computing power and communication between remote sensors and control devices in low bandwidth and unreliable networks. It has the following main characteristics.
1. Use the publish / subscribe message mode to provide more than one message release and release the application coupling.
2. Message transmission of the shielding of the content of the load;
3, the use of TCP/IP to provide network connections;