Zones alternate on and off

[egite]

Zone status alternates between on and off when more than 8 zones are faulted.

The issue seems to be with EXPIRE being set to 30 in zonetracking.py. When more than 8 zones are faulted, the timeout expires before the faulted zone statuses can be refreshed. Increasing this value to 300 solved the issue in my setup with 42 zones.

Ideally, this variable could be available to adjust in the webapp.