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AT command: Through the serial transmission, the AT command is directly issued for operation. The more common one is to use Arduino as the main core, and control the ESP8266 through Rx Tx to expand the wireless Internet access capability. NodeMCU: Developed in LUA language and programmed directly into the memory of the ESP8266. This has the advantage of not having to plug in a single chip like the Arduino 8051 and so on. Native SDK: The SDK provided by Shanghai Lexin, written directly through C/C++. This is the most advanced level. Arduino IDE: Rewrite the native SDK to support the Arduino IDE environment, just like writing Arduino. Because the core is C/C++, but repackaging and providing a variety of APIs, people who would have written Arduino can be painlessly transferred to ESP8266. The same is to write the program directly into the memory, no need to plug in other single chips. Please refer to the teaching course for this part. Web SDK WF8266R.js: Taiwan Tonglian WF8266R has built-in powerful event system and RESTfUL MQTT and WebSocket and other interfaces in ESP8266, and packaged many WEB objects for sensing components and applications on the market. The purpose is to let beginners Or designers, do not need a strong program and hardware background to complete some interactive works.