Update HueLight.js

Add _Color Loop_ characteristic for colour lights.  See #475 and #597.

lib/HueLight.js

@@ -513,6 +513,11 @@ function HueLight (accessory, id, obj, type = 'light') {
         this.checkSat(this.obj.state.sat)
       }
     }
+    if (this.config.colorloop) {
+      this.service.addOptionalCharacteristic(my.Characteristics.ColorLoop)
+      this.service.getCharacteristic(my.Characteristics.ColorLoop)
+        .on('set', this.setColorLoop.bind(this))
+    }
   }
   if (this.type === 'light') {
     this.service.addOptionalCharacteristic(Characteristic.StatusFault)
@@ -542,6 +547,7 @@ HueLight.prototype.setConfig = function () {
     bri: this.obj.state.bri !== undefined,
     ct: this.obj.state.ct !== undefined,
     xy: this.obj.state.xy !== undefined,
+    colorloop: this.obj.state.effect !== undefined,
     wallSwitch: false,
     outlet: this.bridge.outlet[this.type + 's'][this.id],
     resetTimeout: this.bridge.platform.config.resetTimeout,
@@ -741,6 +747,7 @@ HueLight.prototype.checkState = function (state, event) {
         this.checkCT(state.ct)
         break
       case 'effect':
+        this.checkEffect(state.effect)
         break
       case 'hue':
         this.checkHue(state.hue)
@@ -1032,6 +1039,31 @@ HueLight.prototype.checkSat = function (sat) {
   }
 }
 
+HueLight.prototype.checkEffect = function (effect) {
+  if (!this.config.colorloop) {
+    return
+  }
+  if (this.obj.state.effect !== effect) {
+    this.log.debug(
+      '%s: %s effect changed from %s to %s', this.name, this.type,
+      this.obj.state.effect, effect
+    )
+    this.obj.state.effect = effect
+  }
+  const hkColorloop = effect === 'colorloop'
+  if (this.hk.colorloop !== hkColorloop) {
+    if (this.hk.colorloop !== undefined) {
+      this.log.info(
+        '%s: set homekit colorloop from %s to %s', this.name,
+        this.hk.colorloop, hkColorloop
+      )
+    }
+    this.hk.colorloop = hkColorloop
+    this.service.getCharacteristic(my.Characteristics.ColorLoop)
+      .updateValue(this.hk.colorloop)
+  }
+}
+
 HueLight.prototype.checkReachable = function (reachable) {
   if (this.obj.state.reachable !== reachable) {
     this.log.debug(
@@ -1445,6 +1477,26 @@ HueLight.prototype.setSat = function (sat, callback) {
   }
 }
 
+HueLight.prototype.setColorLoop = function (colorloop, callback) {
+  if (colorloop === this.hk.colorloop) {
+    return callback()
+  }
+  this.log.info(
+    '%s: homekit colorloop changed from %s to %s', this.name,
+    this.hk.colorloop, colorloop
+  )
+  const oldColorloop = this.hk.colorloop
+  this.hk.colorloop = colorloop
+  const newEffect = this.hk.colorloop ? 'colorloop' : 'none'
+  this.request({ effect: newEffect }).then(() => {
+    this.obj.state.effect = newEffect
+    callback()
+  }).catch((err) => {
+    this.hk.colorloop = oldColorloop
+    callback(err)
+  })
+}
+
 HueLight.prototype.setPosition = function (position, callback) {
   if (position === this.hk.targetPosition) {
     return callback()