How exactly are you using iMessage with your VoIP number? I thought it requires a valid SIM card to register the number. Also, aren't SMS, MMS media, and MMS groups super finicky with VoIP services?
I've been wanting to buy a sensor watch for a while now. I'm actually really glad I waited to back this now!
I would love an SPL meter on my watch with weighting filters! Don't know much about piezo buzzers but I wonder if it could be used as a microphone for this purpose.
I rather just buy used Lenovo Thinkcentere PCs on eBay. Way more power, cheaper and relatively small. There’s a lot of different CPU/RAM/DISK configurations you can find.
I’ve been buying these, throwing Fedora IoT, docker, and Tailscale on them and running them from different locations for personal projects.