So, perhaps the old failing PLM, continually farkled up the device tables to some extent, taking a bit of time to corrupt most of the devices -- enough that device transmissions failed. A replacement of the PLM, just carried that bad data (sourced from the old PLM table) into the new PLM, much as @paulbates is suggesting.

Finally, the device RESTORE (vice just the PLM replacement procedure), from the Polisy, WITH a new PLM in place finally fixes it as there is no new/further corruption process.

Maybe wishful thinking, but so far the observations would be consistent. Fingers crossed, will report back.

Orest

Edited 14 hours ago14 hr by oskrypuch

And, it is the same pattern with all the devices I've looked at. There is one or two extra lines in the device table, sometimes with no high water mark null line.

Otherwise, all the lines match.

A device restore updates the device table to match the ISY table, and then the device starts fully working. (that is its transmissions are then seen by Polisy)

I've fixed a dozen or so, and will monitor to see if they "unfix", like earlier with the old PLM still in place.

Orest

Edited 9 hours ago9 hr by oskrypuch