Baycom modem USB KISS interface – Dave's dingen webdinges ding
Cellphone-free Texting - IEEE Spectrum
Terminal node controller - Wikipedia
Hands on: A Ham Radio for Makers - IEEE Spectrum
NPR-70 v05 Modem by F4HDK | New Packet Radio over 70cm Band | Amateur Radio Packet Radio | Factory-Assembled | ELEKITSORPARTS
GitHub - sh123/nrf24l01_arduino_kiss_modem: Arduino Amateur Radio NRF24L01 2.4 GHz USB serial KISS TNC (terminal node controller) for AX25 packet networks
Arduino AX.25 TNC | George Smart – M1GEO
Homebrew APRS – Arduino Uno KISS TNC – VK3DAN
NPR-70 v05 Modem by F4HDK | New Packet Radio over 70cm Band | Amateur Radio Packet Radio | Factory-Assembled | ELEKITSORPARTS
Send text messages over ham radio with the HamMessenger | Arduino Blog
Arduino + Ham Radio = Texting | Hackaday
ham radio | PlanetArduino
Arduino AX.25 TNC | George Smart – M1GEO
ESP32 TNC and Audio Relay for HF/VHF Packet Radio | Details | Hackaday.io