You are hereby granted a two year non-exclusive license to use the Meshtastic® logo and trademark on your product/project. No fee is required for this usage, though if you wish keeping $1/unit set-aside so that it can eventually fund meshtastic.org it would be appreciated.
We only ask that you include a line in your support text that states:
Meshtastic® is a registered trademark of Geeksville Industries LLC. Meshtastic software components are released under various licenses, see github for details. No warranty is provided - use at your own risk.