I remember that someone on the User list works with CNC or some such, and I wonder if he knows that CISA https://www.cisa.gov regularly issues advisories about Industrial Control System vulnerabilities?
Leslie -- Platform: Linux Distribution: openSUSE Leap 15.4 (x86_64) Desktop Environment: Trinity Qt: 3.5.0 TDE: R14.0.13 tde-config: 1.0