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Python API to Belkin WeMo devices

Project description

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.

Currently supported devices include Motions, Switches and Light Switches.

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)

Start up the server to listen for responses to the discovery broadcast:

>>> env.start()

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.

You can clear the device cache either by deleting the file ~/.wemo/cache or by using the wemo clear command.


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

You can also clear the device cache:

$ wemo clear

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


Enable debug logging to stdout

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

    tv: TV Room Lights

$ wemo switch tv on



ouimeaux requires Python header files to build some dependencies, and is installed normally using pip or easy_install.


sudo apt-get install python-setuptools python-dev
sudo easy_install pip
sudo pip install ouimeaux


sudo yum -y install python-setuptools python-devel
sudo easy_install pip
sudo pip install ouimeaux

If you wish to build from a local copy of the source, you can of course always execute:

sudo python install


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 0.4.3 (August 31, 2013)

  • Used new method of obtaining local IP for discovery that is less likely to return loopback

  • Exit with failure and instructions for solution if loopback IP is used

  • Updated installation docs to include python-dev and pip instructions (patch by fnaard)

  • Fixed README inclusion bug that occasionally broke installation via pip.

  • Added --debug option to enable debug logging to stdout

Release 0.4 (August 17, 2013)

  • Fixed #7: Added support for light switch devices (patch by nschrenk).

  • Fixed #6: Added “wemo clear” command to clear the device cache.

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.

Release 0.1 (February 2, 2013)

  • Initial release.

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