Believe it or not, this isn't #Meshtastic or #Meshcore
It's #Reticulum 
That's right, Reticulum is finally running on microcontrollers and there's so many ways to do it:
- https://github.com/attermann/microReticulum (C++ implementation of Reticulum; finally getting close to 100% feature complete)
- https://github.com/ratspeak/ratdeck (Pictured T-Deck firmware)
- https://github.com/torlando-tech/pyxis (T-Deck firmware from the maker of Columba)