By taking a 3D printed design intended to attach a TP4056 module ... ESP8266 firmware that turns the powerful microcontroller into a WiFi repeater, [bethiboothi] ended up with a portable network ...

Ever since the ESP8266 WiFi ... a very capable WiFi-enabled MCU which can be programmed using the usual ARM development tools (e.g. Keil) using the provided SDK. The W600 module can be bought ...