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Semaphore: A simple (rule-based) bot library for Signal Private Messenger.

Project description


PyPI GitHub Workflow Status GitHub tag (latest SemVer) License

A simple (rule-based) bot library for Signal Private Messenger in Python. Please note that this library is unofficial, unapproved and not nearly as secure as the real Signal clients.

Table of contents



  1. Install signald or build from source

    $ git clone
    $ cd signald
    $ make installDist
    $ make setup
  2. Install Semaphore

    Latest release from PyPi:

    $ pip install semaphore-bot

    From source with pip:

    $ pip install git+

    From source:

    $ git clone
    $ cd semaphore
    $ python -m pip install .
    $ python sdist bdist_wheel
    $ python -m pip install dist/semaphore-*.tar.gz

Quick start

  1. Start signald

    $ cd signald
    $ build/install/signald/bin/signald
  2. Open a new terminal and connect to signald control socket

    nc -U /var/run/signald/signald.sock
  3. Register phone number with Signal by sending following message on the control socket (replace +xxxxxxxxxxx with bot Signal number)

    {"type": "register", "username": "+xxxxxxxxxxx"}
  4. Verify phone number with SMS verification code by sending following message on the control socket (replace +xxxxxxxxxxx with bot Signal number and zzz-zzz with verification code)

    {"type": "verify", "username": "+xxxxxxxxxxx", "code": "zzz-zzz"}
  5. Verify Signal is working by sending following message on the control socket (replace +xxxxxxxxxxx with bot Signal number and +yyyyyyyyyyy with your Signal number)

    {"type": "send", "username": "+xxxxxxxxxxx", "recipientAddress": {"number": "+yyyyyyyyyyy"}, "messageBody": "Hello world"}
  6. Subscribe to receive messages for the bot by sending following message on the control socket (replace +xxxxxxxxxxx with bot Signal number)

    {"type": "subscribe", "username": "+xxxxxxxxxxx"}
  7. Open a new terminal and set the SIGNAL_PHONE_NUMBER environment variable to your phone number:

    $ export SIGNAL_PHONE_NUMBER=+xxxxxxxxxxx
  8. Start the example echo bot

    $ python examples/
  9. Send message to Signal bot running on +xxxxxxxxxxx and wait for an echo

  10. Now you can start writing your own bot for Signal Private Messenger!

Code example

import anyio
from semaphore import Bot, ChatContext

# Connect the bot to number.
bot = Bot("+xxxxxxxxxxx")

async def echo(ctx: ChatContext) -> None:
    await ctx.message.reply(ctx.message.get_body())

async def main():
    async with bot:
        # Run the bot until you press Ctrl-C.
        await bot.start()

Example bots

The following example bots can be found in examples:

  • apodbot, replies with Astronomy Picture of the Day
  • bbcbot, replies with latest BBC headlines
  • broadcastbot, send broadcast to all subscribers
  • btcbot, sends notification when BTC price drops below a set price
  • echobot, repeats received messages
  • exceptionbot, with custom exception handler
  • lovebot, loves everything you say!
  • spongebot, repeats received messages in sPOngEbOb sqUArepAnTs text
  • stickerbot, links to the sticker pack for received stickers
  • timerbot, sends an alert after a predefined time
  • quotebot, quotes and repeats received messages
  • xkcdbot, replies with latest XKCD comic



  • Add support for sending messages without previous context (thanks @eknoes)
  • Add support for exception handlers (thanks @eknoes)
  • Add ability to set profile picture (thanks @eknoes)
  • Support signald client protocol v1
  • Compatibility with signald 0.12.0+


  • Fix repeating job re-add to queue (thanks @grandchild)


  • Support for typing indicators
  • Support for GroupsV2 (thanks @thefinn93)
  • Example sticker bot (thanks @iomintz)
  • Compatibility with signald 0.11.0+


  • Support for Python 3.9
  • Support for executing multiple handlers in parallel (thanks @iomintz)
  • Support incoming sticker messages (thanks @iomintz)


  • Support for decorators to register handlers
  • Support for sending delivery receipts
  • Mark messages as read by default


  • Compatibility with signald 0.10.0+
  • Support for multiple replies/reactions by handler (thanks @iomintz)
  • Marking messages as read is optional
  • First release on PyPi


  • Support for message reactions
  • Example message reaction bot


  • Improve the logging system
  • Add logging to job queue
  • Strict typing


  • Support for recurring jobs
  • Example BTC price notification bot


  • Support for scheduled jobs
  • Example timer bot


  • Support for quoting messages
  • Example quote bot


  • First release on Github


This project is licensed under the AGPL-v3 license. The full license can be found in LICENSE.txt.

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