So, does everything work if the valuechange column isn’t null? Because it shouldn’t be null- probably shouldn’t cause errors- but shouldn’t need to be null.
Can you post the NPE error you get though? I can’t replicate it here.
I had to ship the system so I can’t reproduce it just now.
On startup when the tags are created, the configchange is set but the valuechange is not set until the point is heard from. If the device is off line this could by awhile.