CTRL-C – SIGINT CTRL-\ – SIGQUIT CTRL-Z + kill -9 %1 – SIGTSTP + SIGKILL

Tbf you are supposed use the signal before turning wheel

Otherwise I’d have to install a gui

Respectfully, that’s not true. GDPR Article 2(2)©:

2. This Regulation does not apply to the processing of personal data: © by a natural person in the course of a purely personal or household activity;

Excuse my ignorance but what chapter / section of the GDPR deals with end users downloading pdfs?

If you’re already using an esp32 why not just get a simple ultrasonic sensor and measure flow on an indoor inlet pipe? You may need to know the pressure (probably 1.7 kPa) and temperature but that should be possible to calibrate against your meter readings

Then your project just becomes a simple pipe clamp that can be indoors