Target Board - zs6buj/AntTracker Wiki

The original target board was the STM32F103 "Blue Pill", chosen for its relative power, small size and support for 3 UARTS From version 2.11 and range of ESP32 and ESP8266 boards are supported. On ESP boards only, WiFi input is supported, and on
ESP32 boards WiFi + Bluetooth.

The arduino mini pro or similar boards could possibly be made to work but are not ideal for performance reasons and lack of second (debugging) serial port.