Looks like a #Bitcoin to #Meshtastic bridge was modded to send #Monero transactions instead.
GitHub
GitHub - jonathancross/MeshtasticMonero_Bridge: Broadcast Raw Transactions over Meshtastic Lora to a computer with Monero Daemon
Broadcast Raw Transactions over Meshtastic Lora to a computer with Monero Daemon - jonathancross/MeshtasticMonero_Bridge