AT_Description

Each instruction maybe contains four types of AT commands.

Type	Instruction Format	Description
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.

Note:

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”

espressif/esp8266_at