Reworked IkeaOutlet into more generic outlet that also (optionally) supports power measurement

This new power measurement feature is used to turn the kettle off
automatically once it is done boiling

config.lua

@@ -78,14 +78,14 @@ automation.device_manager:add(WakeOnLAN.new({
 }))
 
 -- TODO: Update this to 10.0.0.101 when DHCP want to finally work
-local living_mixer = IkeaOutlet.new({
+local living_mixer = OutletOnOff.new({
 	name = "Mixer",
 	room = "Living Room",
 	topic = mqtt_z2m("living/mixer"),
 	client = mqtt_client,
 })
 automation.device_manager:add(living_mixer)
-local living_speakers = IkeaOutlet.new({
+local living_speakers = OutletOnOff.new({
 	name = "Speakers",
 	room = "Living Room",
 	topic = mqtt_z2m("living/speakers"),
@@ -118,12 +118,12 @@ automation.device_manager:add(IkeaRemote.new({
 	end,
 }))
 
-local function off_timeout(duration)
+local function kettle_timeout()
 	local timeout = Timeout.new()
 
-	return function(self, on)
-		if on then
-			timeout:start(duration, function()
+	return function(self, state)
+		if state.state and state.power < 100 then
+			timeout:start(3, function()
 				self:set_on(false)
 			end)
 		else
@@ -132,13 +132,13 @@ local function off_timeout(duration)
 	end
 end
 
-local kettle = IkeaOutlet.new({
+local kettle = OutletPower.new({
 	outlet_type = "Kettle",
 	name = "Kettle",
 	room = "Kitchen",
 	topic = mqtt_z2m("kitchen/kettle"),
 	client = mqtt_client,
-	callback = off_timeout(debug and 5 or 300),
+	callback = kettle_timeout(),
 })
 automation.device_manager:add(kettle)
 
@@ -164,6 +164,20 @@ automation.device_manager:add(IkeaRemote.new({
 	callback = set_kettle,
 }))
 
+local function off_timeout(duration)
+	local timeout = Timeout.new()
+
+	return function(self, state)
+		if state.state then
+			timeout:start(duration, function()
+				self:set_on(false)
+			end)
+		else
+			timeout:cancel()
+		end
+	end
+end
+
 automation.device_manager:add(LightOnOff.new({
 	name = "Light",
 	room = "Bathroom",
@@ -180,8 +194,8 @@ automation.device_manager:add(Washer.new({
 	event_channel = automation.device_manager:event_channel(),
 }))
 
-automation.device_manager:add(IkeaOutlet.new({
-	outlet_type = "Charger",
+automation.device_manager:add(OutletOnOff.new({
+	presence_auto_off = false,
 	name = "Charger",
 	room = "Workbench",
 	topic = mqtt_z2m("workbench/charger"),
@@ -189,7 +203,7 @@ automation.device_manager:add(IkeaOutlet.new({
 	callback = off_timeout(debug and 5 or 20 * 3600),
 }))
 
-automation.device_manager:add(IkeaOutlet.new({
+automation.device_manager:add(OutletOnOff.new({
 	name = "Outlet",
 	room = "Workbench",
 	topic = mqtt_z2m("workbench/outlet"),