MQTTunnelNet 1.0.1

MQTTunnelNet: Tunnel TCP via MQTT broker

This library is a wrapper around libmqttunnel (https://github.com/Staatsgeheim/libmqttunnel)

How to use

Remote and local instances use the same Config file.

Create and start a server (remote)

    var server = MQTTunnel.CreateServer("config.json");
    server.StartAsync();

Create and connect a tunnel (local)

    var tunnel = MQTTunnel.CreateTunnel("config.json", 9000, 8000)
    tunnel.StartAsync();

Create and connect multiple tunnels (local)

    var tunnel1 = MQTTunnel.CreateTunnel("config.json", 9000, 8000)
    tunnel1.StartAsync();
    var tunnel2 = MQTTunnel.CreateTunnel("config.json", 9001, 8001)
    tunnel2.StartAsync();

Config file

You can use client certs as well as username/password or both in the Config file.

{
    "host": "mqttbroker.example",
    "port": 8883,
    "username", "",
    "password", "",
    "caCert": "root-CA.crt",
    "clientCert": "certificate.pem.crt",
    "privateKey": "private.pem.key",
    "control": "device/1/control"
}

Other options

• clientId: MQTT ClientID. If empty, random string is generated

Info

• control: Sets the MQTT topic that is used for this instance

Architecture

Example: Local port = 2022, Remote port = 22,

sequenceDiagram

LocalTCP ->> LocalMQTunnel: conn read from port 2022
LocalMQTunnel ->> MQTTBroker: Publish to local port topic '/2022'
MQTTBroker ->> RemoteMQTunnel: Recieve from local port topic '/2022'
RemoteMQTunnel ->> RemoteTCP: conn write to port 22
RemoteTCP ->> RemoteMQTunnel: conn read from port 22
RemoteMQTunnel ->> MQTTBroker: Publish to local port topic '/22'
MQTTBroker ->> LocalMQTunnel: Recieve from local port topic '/22'
LocalMQTunnel ->> LocalTCP: conn write to port 2022

More internal architecture

sequenceDiagram

participant Remote
participant RemoteTCP
participant RemoteTCPConnection
participant RemoteMQTunnel

RemoteMQTunnel ->> RemoteMQTunnel: subscribe control topic
LocalMQTunnel ->> LocalMQTunnel: make a Tunnel instance which includes local/remote port pair
LocalMQTunnel ->> LocalTCP: NewTCPConnection()
LocalTCP ->> LocalTCP: start listening
Local ->> LocalTCP: connect
LocalTCP ->> LocalMQTunnel: OpenTunnel()
LocalMQTunnel ->> RemoteMQTunnel: Publish control packet
RemoteMQTunnel ->> RemoteTCPConnection: NewTCPConnection()
RemoteTCPConnection ->> RemoteTCP: connect()
RemoteTCP ->> Remote: connect()

License

• MIT