I would like a timer that works like this for an IP camera:
Someone walks in the room, a sensor detects movement and the timer kicks in for 60 seconds. While there is activity in the room, I want the timer to extend every 60 seconds , bt then when the sensor detects no activity for 60 seconds, the timer stops.
see Design Pattern for general pattern to intercept rule actions at runtime. The detailed example involves motion detector and a light, but you could substitute your IP camera for the light.
Thanks guys the camera side of it is a bit of a curve ball as this is managed via changing panels in habpanel based on the value of an item which is what I want to change when the pir goes on or off after a period. I had a rule but I think it was firing many instances of a timer and ten the pir went to ON. The default example was all I needed - works well!