I. at directives
The serial port sends the receive AT command to communicate with the ESP8266, noting that all the AT commands end with a carriage return .
such as: command at, return OK indicates ESP8266 normal;
AT+GMR, returns the firmware version number
TCP connection: 1. Set WiFi mode; 2. List ap;3. ap;4. View IP (Verify that the connection is successful, such as ERR to exit the AP Reconnect); 5. Establish a TCP connection; 6. Send data (receive data automatically); 7. Close TCP
Fruit Cloud Technology ESP8266 Tutorial Study (i)