Meshtastic

Create a comms Channel named UCARS and add the following encryption key (replacing whatever else is there).

eR9+2szwqn0hR+FvWYPx5VdKmL1stkQzGIqX7eGhKF0=

Now you should get all messages sent in that channel with that key.

Theoretical propagation estimated by Meshtastic Site Planner https://site.meshtastic.org/