Rule help, thermostat adjustment motion

Could anyone give me a steer on a rule which will gradually turn down the thermostats if a room isn't active for say 15 min and repeat , I'll try explaining this way
Global variable setpoint (made)
Every 15 min no activity -0.5 and repeat
If activity stop
If activity for 10min then +0.5
Upto the max and min 20 to 15

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