Philippe Andersson wrote:
Just mentioning it because I think it would do exactly what you request. Please have a look at https://smslink.sourceforge.net/.
It's an OSS client-server solution I wrote a long time ago (but it still works great). It's designed to be integrated into higher-level applications (I currently use it as a plugin for Nagios to send me SMS alerts in case a critical server or service goes down).
It requires the use of a hardware GSM module that your PC would access over serial or USB connection, and of course a valid SIM card in the module, so the overall cost of the solution is not null. But the result is really reliable.
I can confirm - this is the solution (albeit not Philippe's code) we have been using (for over fifteen years) up until we switched to Threema. In our case, messages are triggered by an email sent to the machine that has the GSM modem. -- Per Jessen, Zürich (14.2°C) Member, openSUSE Heroes (2016 - present) We're hiring - https://en.opensuse.org/openSUSE:Heroes