And also a direct alternative to the OP: https://github.com/RebekkaMa/android-sms-gateway-server

I've been using this for a while now. It works so well I forgot about it, until I need it: then sms is in my (desktop) element instance.

This was a totally unexpected +1 when onboarding to matrix for personal use.

It would be nice if it would integrate with a 3G/4G dongle. Huawei dongles (maybe ZTE as well?) already have an HTTP endpoint to get SMS and also their USB dongles have no battery, so it is much safer to leave it plugged into a wall 24/7 than a phone.

Most phones these days do have battery charging cut off, so they should be safe but still prefer to have one without battery for leaving it plugged in 24/7.

A simple PowerPoint timer set to be on 1 hour out of every 12 works pretty well to stop wall mounted iPads from doing that “swell up the battery until the screen pops out” thing.

Or pulsesms if one wants a zero config solution, albeit proprietary:

https://home.pulsesms.app/overview/

Ooh, neat!