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Interface for Sonoff devices running original Itead firmware, in LAN mode.

Project description

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Control Sonoff devices running original firmware, in LAN mode.

This module provides a way to interface with Sonoff smart home devices, such as smart switches (e.g. Sonoff Basic), plugs (e.g. Sonoff S20), and wall switches (e.g. Sonoff Touch), when these devices are in LAN Mode.

LAN Mode is a feature introduced by manufacturer Itead, to allow operation locally when their servers are unavailable. Further details can be found in the eWeLink LAN Mode guide.

Since mid 2018, the firmware Itead have shipped with most Sonoff devices has provided this feature, allowing devices to be controlled directly on the local network using a WebSocket connection on port 8081.

The feature is designed to only be used when there is no connection to the Itead cloud servers, (e.g. if your internet connection is down, or their servers are down). As such, it is only enabled when the device is connected to your WiFi network, but unable to reach the Itead servers.

Most users will only be able to use this by deliberately blocking internet access to their Sonoff devices.


  • Discover all devices on local network (,

  • Discover IP address for device with known Device ID (from eWeLink app)

  • Read device state

  • Switch device ON/OFF

  • Listen for state changes announced by the device (e.g. by physical switch)

  • Activate inching/momentary device, with variable ON time (e.g. 1s)



$ pip install pysonofflan

Command-Line Usage

Usage: pysonofflan [OPTIONS] COMMAND [ARGS]...

  A cli tool for controlling Sonoff Smart Switches/Plugs in LAN Mode.

  --host TEXT          IP address or hostname of the device to connect to.
  --device_id TEXT     Device ID of the device to connect to.
  --inching TEXT       Number of seconds of "on" time if this is an
                       Inching/Momentary switch.
  -v, --verbosity LVL  Either CRITICAL, ERROR, WARNING, INFO or DEBUG
  --help               Show this message and exit.

  discover  Discover devices in the network (takes ~1...
  listen    Connect to device, print state, then print...
  off       Turn the device off.
  on        Turn the device on.
  state     Connect to device and print current state.

Usage Example

$ pysonofflan discover
2019-01-31 00:45:32,074 - info: Attempting to discover Sonoff LAN Mode devices on the local network, please wait...
2019-01-31 00:46:24,007 - info: Found Sonoff LAN Mode device at IP

$ pysonofflan --host state
2019-01-31 00:41:34,931 - info: Initialising SonoffSwitch with host
2019-01-31 00:41:35,016 - info: == Device: 10006866e9 ( ==
2019-01-31 00:41:35,016 - info: State: OFF

$ pysonofflan --host on
2019-01-31 00:49:40,334 - info: Initialising SonoffSwitch with host
2019-01-31 00:49:40,508 - info:
2019-01-31 00:49:40,508 - info: Initial state:
2019-01-31 00:49:40,508 - info: == Device: 10006866e9 ( ==
2019-01-31 00:49:40,508 - info: State: OFF
2019-01-31 00:49:40,508 - info:
2019-01-31 00:49:40,508 - info: New state:
2019-01-31 00:49:40,508 - info: == Device: 10006866e9 ( ==
2019-01-31 00:49:40,508 - info: State: ON

Library Usage

All common, shared functionality is available through SonoffSwitch class:

x = SonoffSwitch("")

Upon instantiating the SonoffSwitch class, a connection is initiated and device state is populated, but no further action is taken.

For most use cases, you’ll want to make use of the callback_after_update parameter to do something with the device after a connection has been initialised, for example:

async def print_state_callback(device):
    if device.basic_info is not None:
        print("ON" if device.is_on else "OFF")


This example simply connects to the device, prints whether it is currently “ON” or “OFF”, then closes the connection. Note, the callback must be asynchronous.

Module-specific errors are raised as Exceptions, and are expected to be handled by the user of the library.


  • Free software: MIT license


This package was created with Cookiecutter and the audreyr/cookiecutter-pypackage project template.


0.3.0 (2019-05-16)

  • Cleaned up shutdown code

  • Create retry logic throughout to deal with disconnect and other failures

  • Added functionality to deal with state maintenance

  • Updated dependencies

  • Removed flaky test

0.2.1 (2019-02-02)

  • Made websocket library usage backwards-compatible with older versions

0.2.0 (2019-02-02)

  • Rewrote discovery to use multiple threads so it only takes 1 second

  • Improved logging in client class with logger passed through

  • Improved handling of event loop to allow usage within existing async codebase

  • Added –version argument to CLI

0.1.7 (2019-02-01)

  • Migrated from bumpversion to bump2version for cleaner release process

0.1.6 (2019-02-01)

  • Another bump to let Travis upload to PyPi itself, to fix the build

0.1.5 (2019-02-01)

  • Bumped version after tweaking build workflow

0.1.4 (2019-01-31)

  • Tweaked various build and testing parameters to get code coverage and distribution working

0.1.3 (2019-01-31)

  • Updated README layout

  • Added coveralls config for travis and CHANGELOG/HISTORY link

0.1.2 (2019-01-31)

  • Fixed documentation build for ReadTheDocs

  • Fixed restructuredtext in history which was breaking PyPi formatting

0.1.1 (2019-01-30)

  • Improved discovery logging

  • Added documentation

  • Fixed tests

0.1.0 (2019-01-27)

  • First release on PyPI.

  • Basic functional CLI client, to allow basic control (on, off, check state)

  • Added comprehensive logging with verbosity option to help debug new devices

  • Control of device is via async websocket, so should be usable in async code

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