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SimpleX Chat

SimpleX Chat is a private, decentralised messaging platform where users own their contacts and groups. Unlike other platforms, SimpleX assigns no persistent user IDs — every contact is identified by an opaque internal ID generated at connection time, which makes it one of the most private messengers available.

Prerequisites​

  • The simplex-chat CLI installed and running as a daemon
  • Python package websockets (pip install websockets)

Install simplex-chat​

Download the latest release from the simplex-chat GitHub releases page, or via Docker:

# Linux / macOS binary
curl -L https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-chat-ubuntu-22_04-x86-64 -o simplex-chat
chmod +x simplex-chat

# Or Docker
docker run -p 5225:5225 simplexchat/simplex-chat -p 5225

Start the daemon​

simplex-chat -p 5225

The daemon listens on WebSocket at ws://127.0.0.1:5225 by default.

Configure Hermes​

Via setup wizard​

hermes setup gateway

Select SimpleX Chat and follow the prompts.

Via environment variables​

Add these to ~/.hermes/.env:

SIMPLEX_WS_URL=ws://127.0.0.1:5225
SIMPLEX_ALLOWED_USERS=<contact-id-1>,<contact-id-2>
SIMPLEX_HOME_CHANNEL=<contact-id>
VariableRequiredDescription
SIMPLEX_WS_URLYesWebSocket URL of the simplex-chat daemon
SIMPLEX_ALLOWED_USERSRecommendedComma-separated contact IDs allowed to use the agent
SIMPLEX_ALLOW_ALL_USERSOptionalSet true to allow every contact (use carefully)
SIMPLEX_HOME_CHANNELOptionalDefault contact ID for cron job delivery
SIMPLEX_HOME_CHANNEL_NAMEOptionalHuman label for the home channel

Find your contact ID​

After starting the daemon, open a conversation with your agent contact. The contact ID will appear in session logs or via hermes send_message action=list.

Authorization​

By default all contacts are denied. You must either:

  1. Set SIMPLEX_ALLOWED_USERS to a comma-separated list of contact IDs, or
  2. Use DM pairing — send any message to the bot and it will reply with a pairing code. Enter that code via hermes gateway pair.

Using SimpleX with cron jobs​

cronjob(
    action="create",
    schedule="every 1h",
    deliver="simplex",          # uses SIMPLEX_HOME_CHANNEL
    prompt="Check for alerts and summarise."
)

Or target a specific contact:

send_message(target="simplex:<contact-id>", message="Done!")

Privacy notes​

  • SimpleX never reveals phone numbers or email addresses — contacts use opaque IDs
  • The connection between Hermes and the daemon is local WebSocket (ws://127.0.0.1:5225) — no data leaves your machine
  • Messages are end-to-end encrypted by the SimpleX protocol before reaching the daemon

Troubleshooting​

"Cannot reach daemon" — Ensure simplex-chat -p 5225 is running and the port matches SIMPLEX_WS_URL.

"websockets not installed" — Run pip install websockets.

Messages not received — Check that the contact's ID is in SIMPLEX_ALLOWED_USERS or approve them via DM pairing.