Add "Sensor Watch" functionality to monitor sensors whilst the alarm is disarmed

[nzkiwi68]

Checklist

• I checked for similar existing requests (both open and closed) before posting.
• My request is generic, other users may benefit from it too.

Proposal

Add "Sensor Watch" function to monitor sensors. The idea is to count in say days the time that a sensor, e.g. the lounge PIR does not trigger whilst the alarm is disarmed and then trigger an alert if the sensor does not open/trigger once during that configured period (say 5 days).

This checks that your sensors are functioning at least at some level. If a sensor fails (say the lounge PIR internal sensor relay) then sensor watch will never see the lounge PIR trigger and will report in time a "Sensor Watch" fault.
Another common fault is the sensor gets obscured (who put that box up there?) or a nail or staple in the wire, especially since most of the alarm panel systems for HA don't support double EOL wiring. It adds great peace of mind to HA alarm systems that at a basic level HA and alarmo are seeing the sensors triggering from time to time.

From an EDM Solution16 alarm panel:
Sensor watch is part of control panel’s watchdog circuitry. It is a feature designed to ensure that all your detection devices are working correctly.
Sensor watch time determines how many days (0-99) a zone may remain sealed before registering as a fault.This feature is only active while the system is in the disarmed state because while your system is armed, the detection devices are on stand-by waiting to be activated.
If a zone programmed for sensor watch has not triggered and reset during this time, the FAULT indicator will illuminate and the codepad will beep once every minute. To cancel the codepad beeping once every minute, press the button. Refer to “Fault Descriptions” on page 41 for more information. Refer to “Installation Notes” on page 62 to check if “Sensor Watch Time” has been programmed by your installer..

From a Bosch alarm panel:
Sensor Watch Fault
A sensor watch fault registers because one or more detection devices failed to detect any movement during the disarmed state for the time period programmed by your installer. The fault clears once the zone in question detects movement and resets. Press the [4] key until two beeps sound. This displays the zone reporting the sensor watch fault.

Additional info

• Each sensor could have the sensor watch function enabled independently
• A global sensor watch time in say days for the maximum number of days any "sensor watched" sensor can remain closed/not trigger whilst the alarm is in the disarmed state
• Every time a sensor triggers whilst the alarm is disarmed, the sensor watch time monitor for that sensor is reset to 0
• The ability to clear / reset a sensor watch fault