I have recently built an Android app that creates a nearby M-to-N mesh using the phones Bluetooth radio (BLE). This allows for nearby text messaging with no additional hardware. This is working quite well so far, but the range is obviously limited. I’ve used goTenna for a long time (since first gen) to do off-grid communication with one other person. Now I am thinking of combining the ideas and using goTenna to act as a “bridge” between two hyper-local M-N mesh nodes. Something like this:
Sure, it is still in testing right now but you can download the beta at https://www.getknit.app/ if you want. It may not work well on all devices due to Bluetooth quirks but you can let me know if you run into any problems.
I will be looking in to goTenna SDK integration shortly.