message: [fix] Fix rgb light auto discovery index
diff: @@ -783,9 +783,11 @@ Gateway.prototype.discoverValue = function (node, valueId) {
  }
  break
  case 'color':
  + if (valueId.index === 0) {
  cfg = copy(hassCfg.light_rgb)
  cfg.discovery_payload.rgb_state_topic = this.mqtt.getTopic(topic)
  cfg.discovery_payload.rgb_command_topic = cfg.discovery_payload.rgb_state_topic + '/set'
  + } else return
  break
  case 'battery':
  cfg = copy(hassCfg.sensor_battery)
  