How to have homebridge listen on multiple network interfaces?

Describe Your Problem:

I have most of my IOT devices on a separate ‘guest’ WiFi (192.168.1.X) and just 2 on my main WiFi + wired network (192.168.1.Y) . Homebridge is running on a raspberry pi 4 and the raspberry pi 4’s eth0 is connected to the main network and wlan0/WiFi is connected to the guest network. Right now Homebridge listens only on eth0 and doesn’t see most of my devices. How do I configure Homebridge to use both network interfaces (to work with devices on both networks) ?

Homebridge Config:

{
    "bridge": {
        "name": "Homebridge  <snip for privacy>",
        "username": "<snip for privacy>",
        "port": 51620,
        "pin": "<snip for privacy>"
    },
    "accessories": [
       <snip for privacy>
    ],
    "platforms": [
        {
            "name": "Config",
            "port": 8581,
            "platform": "config"
        },
       <snip for privacy>
    ]
}

Environment:

HomeBridge v1.1.1 Node.js Version v12.18.2, Npm Version v6.14.6 Operating System**: Raspbian GNU/Linux 10 (buster) Process Supervisor**: hb-service

[oznu]

I think, based on a chat I’ve had with @Supereg, at some point before 1.2.0 is released we will be allowing you to define which interface you want to listen on.

eg.

"mdns": {
   "interface": "eth0"
}

This will also accept an IP address too, for backwards compatablity with Homebridge < 1.0.0:

"mdns": {
   "interface": "192.168.1.1"
}

[Supereg]

Just to have it updated. This feature was added in the 1.3.0 beta using the new bridge.bind config option.