Yeah, I was imagining that it was connected to my phone, but I'm not sure how to setup my phone such that it responds to messages like that - I've never tried sending my phone bluetooth messages and I don't know if that would be possible (to go watch to phone via BT and phone to self-hosted server via mobile network). Can I have an app always listening for messages over BT? Hopefully I don't need a PiZero W in my pocket: watch to Pi via BT as a relay, Pi to phone via Wifi hotspot, and phone to self-hosted server via mobile network. Sounds like a lot of work, lol. I'll think about applications for it. They'd have to be pretty awesome.