im2im

Daemon to bridge between two instant messaging protocols.

The service listens for incoming messages on a given protocol and forwards them to another protocol. It's designed to be extensible to support the addition of new protocols and configuring their usage via a configuration file (YAML), any amount of bridges can be run at the same time within the same process.

Supported protocols

• TCP
• Telegram Bot

Overview

Example for sending and receiving messages between TCP socket ⇔ Telegram Bot API, using a microcontroller (thin client) in LAN with a Raspberry Pi (running im2im):

im2im.yaml

bridges:
  bridge1:
      from:
        tcp:
          host: ""  # daemon listens on all interfaces (reachable in LAN)
          port: 9001
      to:
        telegram_bot:
          token: ABCDEFGHIJKLMNOPQRSTUVWXYZ
          chat_id: 123456789
  bridge2:
    from:
      telegram_bot:
          token: ABCDEFGHIJKLMNOPQRSTUVWXYZ
          chat_id: 123456789
    to:
      tcp:
          host: 192.168.1.50  # microcontroller IP address in LAN
          port: 9002

Installation

From source

make build

Docker

make docker-build

Usage

Configuration

cp im2im.yaml.example im2im.yaml

Minimal example:

bridges:
  bridge0:
      from:
        tcp:
          host: localhost
          port: 9001
      to:
        tcp:
          host: localhost
          port: 9002

Connecting

Using Netcat as TCP client and server.

nc -l 9002  # server

make run  # daemon

nc localhost 9001  # client

Implementation

• Go 1.20, each bridge spawns two goroutines (sender/receiver) and uses one channel to pass the message.

Contributing

See CONTRIBUTING.md for submitting pull requests.

License

MIT License Copyright (c) 2023 Andrei Regiani