1. Use a NODEMCU development board from Shenzhen Sibo Zhilian Technology Co., Ltd. 3. Download the MQTT SDK compressed package, please see the attachment. 4. Use the official Eclipse to open the MQTT SDK development package. 5. Open mqtt_config.h in the include folder. You can see the following setting information. You can set it according to your own network and server. 6. After the settings are completed, select, right-click the mqtt file and click Bulid project. 7. Wait for the compilation to complete and check the Console. Check the compiled file and the compiled burning address. 8. Open Espressif's burning tool. http://bbs.doit.am/forum.php?mod ... 196&highlight=tools Set it up as shown below. The burning file is under the bin folder in the mqtt project file. 9. Test, open the serial port debugging assistant. Test as follows: Note: The server in the SDK has been disabled. Resource package download address: http://bbs.doit.am/forum.php?mod ... wNTMyNjV8MHw0NDE%3D