The patch is this one : pimodbus-master/stretch,now 1.0.10-1~revpi9+1 armhf [installed] ?
I updated my device and the problem's keep happening.
After a reboot you need to run the following command : ( sudo piModbusMaster started ) manually to get the system working.
The problem is not solved yet
![Traurig :(](./images/smilies/icon_e_sad.gif)
Thanks,
Joca