Single sketch minimalistic Arduino LoRa USB serial KISS modem for APRS or AX25 packet networks.
To be used with APRSDroid using USB OTG or Linux APRS/AX.25 tools on PC or Raspberry.
Similar modem, but based on 2.4 GHz NRF24L01: https://github.com/sh123/nrf24l01_arduino_kiss_modem