Thank you for sharing this. My configuration was built in a similar manner with one key exception. I have a revpimodio2-based python script running to control output based on user-input at a SCADA HMI. If the Python script is disabled, I can successfully write to OPC UA output registers. If the ...

One additional note:

3. The PTP service (UDP ports 319 and 320) must also be enabled in the firewall. This can be done in cockpit, or at the shell:

$ sudo firewall-cmd --add-service=ptp

For anyone interested, I have successfully enabled PTP on a RevPi Core S. Simple instructions:

1. From a shell in the Rev Pi:

$ sudo apt install chrony linuxptp
$ sudo systemctl enable timemaster

2. You will need to edit /etc/linuxptp/ptp4l.conf and /etc/linuxptp/timemaster.conf for your use case ...

While attempting to implement OPCUA, I cannot establish a good write method from external SCADA software to OPCUA registers. OPCUA input registers (via a virtual device module) do not appear to be writeable. If OPCUA output registers (same virtual device module) are write-enalbed in PiCtory, SCADA ...