Python class for appdaemon using Sonoff motion sensor

motion_lights.py

import hassapi as hass

#
# App to turn lights on when motion detected then off again after a delay
#
# Use with constraints to activate only for the hours of darkness
#
# Args:
#
# sensor: binary sensor to use as trigger
# entity_on : entity to turn on when detecting motion, can be a light, script, scene or anything else that can be turned on
# entity_off : entity to turn off when detecting motion, can be a light, script or anything else that can be turned off.
#              Can also be a scene which will be turned on.
# delay: amount of time after turning on to turn off again. If not specified defaults to 60 seconds.


class MotionLights(hass.Hass):
    def initialize(self):
        self.handle = None
        # Check some Params
        if "delay" in self.args:
            self.delay_off = self.args["delay"]
        else:
            self.delay_off = 60

        # Subscribe to sensors
        if "sensor" in self.args:
            self.listen_state(self.motion, self.args["sensor"])
            self.log("Sensor: {} Timeout: {}".format(self.args["sensor"], self.args["delay"]))
        else:
            self.log("No sensor specified, doing nothing")

    def motion(self, entity, attribute, old, new, kwargs):
        if new == "on":
            if "entity_on" in self.args:
                self.log("Motion detected: switching {} on".format(self.args["entity_on"]))
                self.turn_on(self.args["entity_on"])
                if self.handle:
                    self.cancel_timer(self.handle)
        elif new == "off":
            self.log("Motion sensor went off: switch off in {} sec".format(self.delay_off))
            self.handle = self.run_in(self.light_off, self.delay_off)

    def light_off(self, kwargs):
        if "entity_off" in self.args:
            self.log("Turning {} off".format(self.args["entity_off"]))
            self.handle = None
            self.turn_off(self.args["entity_off"])

    def cancel(self):
        self.cancel_timer(self.handle)

Based on AppDaemon example app:
https://github.com/AppDaemon/appdaemon/blob/dev/conf/example_apps/motion_lights.py

The original version doesn't work well with sensors which won't re-trigger (e.g. Sonoff SNZB-03 with ~60 sec timeout). The lamp will be turned off even with continuous motion and will only be re-triggered when motion state changes to off and on again.
So I have changed the code to only start the timer when the motion sensor state changes to off.