Commands can be sent through serial communication.

However, a word of caution - it is highly undocumented (primary reason for writing this document), and more importantly, it is frequently updated and not backward compatible. The idea is to be able to telnet into the TCP port and communicate with the Arduino. The standard ESP8266 Gateway sketch can be used without modification (except for SSID & password).In order to upload code to the ESP8266 and use the serial console, you will need a USB to serial converter! Use either an FTDI cable or any console cable, you can use either 3V or 5V logic and power as there is level shifting on the RX pin.2) so i to access the esp8266 module on the nodemcu esp8266 and made all the wirings so i can access the wifi from the arduino directly then i'll have the benefit of uploading the arduino data through the esp8266 without programing the nodemcu controller, but i failed when i enter any AT command nothing happens NodeMCU V3 is my choice for this project, you may use any other ESP8266 board. Then click START button and wait for ESP8266 to power up. Some creative ESP8266 supporters have developed the Arduino core for the ESP8266 Wi-Fi SoC, which can be found on the GitHub ESP8266 core web page.ESP8266 communicates with Arduino ® through a serial connection. Modify it under the terms of the GNU Lesser General Public.

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