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Each instruction maybe contains four types of AT commands.
|Test||AT+CMD=?||Query the Set command or internal parameters and its range values.|
|Query||AT+CMD?||Returns the current value of the parameter.|
|Set||AT+CMD=Parameter||Set the value of user-defined parameters in commands and run.|
|Execute||AT+CMD||Runs commands with no user-defined parameters.|
- Not all AT instruction has four commands.
-  = default value, not required or may not appear.
- String values require double quotation marks, for example: AT+CWSAP=“ESP756190”,”21030826”,1,4.
- Baud rate = 115200
- AT instruction ends with “\r\n”
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