Considering your other solution parts include simcard dongle, maybe look at KDE Connect to send/receive sms on your linux machine?
https://community.kde.org/KDEConnect#Desktop_SMS_Messaging_App
this post was submitted on 08 Nov 2025
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Yeah, that's what I'm doing. I'm running a de-Googled Android (/e/OS on a Fairphone 6) and using the KDE Connect app on there to sync up with my desktop (via GSConnect in NixOS since I'm running GNOME, though KDE Connect would be preferable if you're running Plasma). It's not perfect, and I've run into a few bugs (especially with regard to group messages), but it's surprisingly reliable otherwise.
Should be doable with Termux:
- https://f-droid.org/packages/com.termux (the terminal emulator itself);
- https://f-droid.org/packages/com.termux.api (for
termux-sms-listandtermux-sms-sendcommands); - https://f-droid.org/packages/com.termux.boot (to make the script launch automatically after reboots; don't forget a wake lock to keep the process alive).
termux-sms-list returns messages in JSON, which is easy enough to handle with, say, jq in bash or json in python. The script itself can be a simple loop that fetches the latest messages every few minutes, filters for unprocessed ones from whitelisted numbers and calls termux-sms-send.
Maybe it'd make sense to daemonise the script and launch it via sv.
But the Termux app weighs quite a bit itself.
I don't know but I would try Tasker if it were me.
Wow, I was looking for a project idea and if this is open I'd love to fill in the feature vacuum. I'll need to learn a bunch of stuff though.