paulbates

This is not exactly what you're asking, but there are other ways to debug
Put notifications in key spots in programs to alert you and then remove them once the program is working. I've recently completed several programs and notifications got me around my "bugs"
  As an alternative to notifications, set a variable, If your program is setting variables this is a good method and also recently used this method. To see these changes, open the event viewer (as opposed to the log) and look for entries something like VAR[ 2 7]... where 2 = state variable, and 7= variable number on the list of variables.
   

Looks like you're on an isy 994i. The new insteon i3 devices are not (fully) supported, you'll need a polisy or eisy to fully utilize i3 devices

The combination of older PLM and flaky behavior says it's time to get a new PLM and handle the swap on your terms, not when things get a lot worse and it stops working.
 

Also possible-to-likely is that the new router's ip4 subnet is different than the old router's.
Via the mobile app:
Settings Systems Pick your isy Scroll down to "local connection settings" Your ip and ports will be listed there