The ESP8266 is a device with a built-in WiFi connection system that can operate in both AP (Access Point) mode and client mode connected to an existing WiFi network or STA. The developer can set the name of the device (ESSID) or use the name according to the value set by the system to MicroPython-xxxx, where x represents the MAC Address of the device, the password is micropythoN (the developer can define a new one) with the IP address (IP Address) of 192.168.4.1.