JavaScript client library for controlling and subscribing to Wemo Devices
Last updated 5 years ago by octoblu .
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Wemo Client for Node.js

Low-level client library for controlling recent Wemo devices including Bulbs. Supports event subscriptions to get live updates from devices.

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Supported Devices

  • Wemo Switch
  • Wemo Motion
  • Wemo Insight Switch
  • Wemo Maker
  • Wemo Link
    • Wemo LED Bulb
    • OSRAM Lightify Flex RGBW
    • OSRAM Lightify Tunable White (untested)
    • OSRAM Gardenspot Mini RGB (untested)
  • Wemo Light Switch


$ npm install wemo-client


var Wemo = require('wemo-client');
var wemo = new Wemo();

wemo.discover(function(deviceInfo) {
  console.log('Wemo Device Found: %j', deviceInfo);

  // Get the client for the found device
  var client = wemo.client(deviceInfo);

  // Handle BinaryState events
  client.on('binaryState', function(value) {
    console.log('Binary State changed to: %s', value);

  // Turn the switch on




Static map of supported models and device types.

  • Bridge
  • Switch
  • Motion
  • Maker
  • Insight
  • LightSwitch


Discover Wemo devices via UPnP. A deviceInfo will be passed to cb that can be used to get a client for the device found.

  • Callback cb Callback called with for every single device found.

load(setupUrl, cb)

Allows to skip discovery if the setupUrl of a Wemo is already known. A deviceInfo will be passed to cb that can be used to get a client for the device found.

  • String setupUrl Must point to setup.xml of the requested device (http://device_ip:device_port/setup.xml).
  • Callback cb


Get a single instance of WemoClient for the device specified by deviceInfo.

  • Object deviceInfo The deviceInfo as returned by the discovery.


Event: binaryState (value)

Binary state of a device has been updated, e.g. a motion sensor detected motion or a plug is switched on.

  • String value The state of the binary switch/sensor. 1 = on/closed/motion, 0 = off/open/quiet
client.on('binaryState', function(value) {
  console.log('Device turned %s', value === '1' ? 'on' : 'off')

Event: statusChange (deviceId, capabilityId, value)

Capability of a device connected via Wemo Bridge changed its status.

  • String deviceId Id of the device connected to the bridge
  • String capabilityId Capability
  • String value Status

Event: attributeList (name, value, prevalue, timestamp)

Attribute of a device has changed. This seems to apply to Wemo Maker only for now.

  • String name Name of the attribute, e.g. Switch
  • String value Current value
  • String prevalue Previous value
  • String timestamp Timestamp of the change

Event: insightParams (binaryState, instantPower, data)

Wemo Insight Switch sent new power consumption data.

  • String binaryState 1 = on, 0 = off, 8 = standby
  • String instantPower Current power consumption in mW
  • Object data Aggregated usage data

Event: error (err)

An error occured while handling the event subscriptions or calling a device action. When err.code is one of ECONNREFUSED, EHOSTUNREACH or ETIMEDOUT the device likely went offline.

  • Object err


Get bulbs connected to a Wemo Bridge. An endDeviceInfo for every device paired is passed to the callback in an array, e.g.:

  friendlyName: 'Color Bulb',
  deviceId: 'EA103EA2B2782FFF'
  capabilities: {
    '10006': '1'
    '10008': '121:0'
  deviceType: 'dimmableLight'

Device groups are treated as if they were single devices – a sole endDeviceInfo is returned per group.

Notice: The capabilities property may represent outdated values due to some odd behavior of the device API. Please refer to getDeviceStatus or Event: statusChange to obtain the current state of the device.

  • Callback cb cb(err, endDeviceInfos)


Get the device's binary state.

  • Callback cb cb(err, state)

The callback is passed the state (1 = on, 0 = off).

setBinaryState(value, [cb])

Turn the device on or off. Will also cause a binaryState event to be triggered.

  • String value 1 = on, 0 = off
  • Callback cb cb(err, response)


Get the device attributes of a Wemo Maker.

  • Callback cb cb(err, attributes)

getDeviceStatus(deviceId, cb)

Gets the device Status of a device connected via Wemo Bridge, e.g. a bulb.

  • String deviceId Id of the device connected to the bridge (determined by calling getEndDevices)
  • Callback cb cb(err, deviceStatus)

The callback is passed the deviceStatus which is a map of device capabilities and values, e.g.:

  '10006': '1', // on = 1, off = 0, offline = empty
  '10008': '121:0', // brightness 0-255
  '30008': '0:0', // no sleep timer active
  '30009': '', // unknown
  '3000A': '' // unknown

setDeviceStatus(deviceId, capability, value, [cb])

Controls a capability of a device connected via Wemo Bridge, e.g. a bulb.

  • String deviceId Id of the device connected to the bridge (determined by calling getEndDevices)
  • String capability Capability
  • String value Value
  • Callback cb cb(err, response)

Known capabilities (depends on device):

  • 10006 Turn bulb on/off. Values: 1 = on, 0 = off
  • 10008 Dim bulb. Value: brightness:transition_time, where brightness = 0-255
  • 30008 Sleep timer. Value: seconds*10:current_unixtime
  • 10300 Color. Value: X:Y:transistion_time
  • 30301 Color Temperature. Value: ct:transition_time, where ct = 170-370

setLightColor(deviceId, red, green, blue, [cb])

Convenience function for setting the color of a RGB light.

  • String deviceId Id of the light connected to the bridge (determined by calling getEndDevices)
  • Number red 0-255
  • Number green 0-255
  • Number blue 0-255
  • Callback cb cb(err, response)


Get power consumption data for a Wemo Insight Switch

  • Callback cb cb(err, binaryState, instantPower, data)

The callback is passed the binaryState, instantPower and data (see Event: InsightParams)


Wemo Client uses debug, so just run with environmental variable DEBUG set to wemo-client.

$ env DEBUG=wemo-client node examples/index.js


Contributions are very welcome! Please note that by submitting a pull request for this project, you agree to license your contribution under the MIT License to this project.


Credit goes to Ben Hardill for his research on Belkin Wemo devices.


Published under the MIT License.

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