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ouimeaux 0.3

Python API to Belkin WeMo devices

Latest Version: 0.8

ouimeaux is a Python interface to Belkin WeMo devices. It uses gevent for async I/O and requests for communication with the devices. It also provides a minimal command-line interface for discovery and switch toggling.

Python API


The main interface is presented by an Environment, which optionally accepts functions called when a Switch or Motion device is identified:

>>> from ouimeaux.environment import Environment
>>> def on_switch(switch):
...     print "Switch found!",
>>> def on_motion(motion):
...     print "Motion found!", switch.motion
>>> env = Environment(on_switch, on_motion)

Discovery of all WeMo devices in an environment is then straightforward; simply pass the length of time (in seconds) you want discovery to run:

Switch found! Living Room

During that time, the Environment will continually broadcast search requests and parse responses. At any point, you can see the names of discovered devices:

>>> env.list_switches()
['Living Room', 'TV Room', 'Front Closet']
>>> env.list_motions()
['Front Hallway']

Devices can be retrieved by using get_switch and get_motion methods:

>>> switch = env.get_switch('TV Room')
>>> switch
<WeMo Switch "TV Room">


All devices have an explain() method, which will print out a list of all available services, as well as the actions and arguments to those actions on each service:

>>> switch.explain()

  SetServerEnvironment(ServerEnvironmentType, TurnServerEnvironment, ServerEnvironment)

Services and actions are available via simple attribute access. Calling actions returns a dictionary of return values:

>>> switch.basicevent.SetBinaryState(BinaryState=0)
{'BinaryState': 0}


By default, ouimeaux subscribes to property change events on discovered devices (this can be disabled by passing with_subscribers=False to the Environment constructor). You can register callbacks that will be called when switches and motions change state (on/off, or motion detected):

>>> def on_motion(value):
...     print "Motion detected!"
>>> env.get_motion('Front Hallway').register_listeners(on_motion)
>>> env.wait()

Note the use of Environment.wait() to give control to the event loop for events to be detected.


Switches have three shortcut methods defined: get_state, on and off.


Motions have one shortcut method defined: get_state.

Device Cache

By default, device results are cached on the filesystem for quicker initialization. This can be disabled by passing with_cache=False to the Environment constructor. On a related note, if you want to use the cache exclusively, you can pass with_discovery=False to the Environment constructor to disable M-SEARCH requests.


A configuration file in YAML format will be created at ~/.wemo/config.yml:

# ip:port to bind to when receiving responses from discovery.
# The default is first DNS resolution of local host, port 54321
# bind:

# Whether to use a device cache (stored at ~/.wemo/cache)
# cache: false

# Shortcuts to longer device names. Uncommenting the following
# line will allow you to execute 'wemo switch lr on' instead of
# 'wemo switch "Living Room Lights" on'
#    lr: Living Room Lights

Command Line

The wemo script will discover devices in your environment and turn switches on and off. To list devices:

$ wemo list

Default is to search for 5 seconds; you can pass --timeout to change that.

To turn a switch on and off, you first have to know the name. Then:

$ wemo switch "TV Room" on
$ wemo switch "TV Room" off

Or, you can toggle the device:

$ wemo switch "TV Room" toggle

The wemo script will obey configured settings; they can also be overridden on the command line:

Disable the device cache
--bind IP:PORT
Bind to this host and port when listening for responses

Aliases configured in the file will be accessible on the command line as well:

    tv: TV Room Lights

$ wemo switch tv on



ouimeaux requires gevent version 1.0rc2 or higher. If you don’t have the ability to compile gevent and greenlet (a sub-dependency) locally, you can find and download the binary installers for these packages here:


Release 0.3 (May 25, 2013)

  • Fixed #4: Added ability to specify ip:port for discovery server binding. Removed documentation describing need to disable SSDP service on Windows.
  • Fixed #5: Added device cache for faster results.
  • Added configuration file.
  • Added ability to configure aliases for devices to avoid quoting strings on the command line.
  • Added ‘toggle’ command to command line switch control.

Release 0.2 (April 21, 2013)

  • Fixed #1: Added ability to subscribe to motion and switch state change events.
  • Added Windows installation details to README (patch by brianpeiris)
  • Cleaned up UDP server lifecycle so rediscovery doesn’t try to start it back up.
File Type Py Version Uploaded on Size
ouimeaux-0.3.tar.gz (md5) Source 2013-05-25 27KB