How-To : Install and Run VelServ - a Velbus TCP Gateway

For developers
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Thank you all for your replies, I have since advanced a bunch.
However, I still have some difficulties connecting my RPi server through VelbusLink.
I’m currently running Home Assistant Container on a Raspberry Pi 3B using the (Raspberry Pi Lite) OS:

Operating System: Debian GNU/Linux 11 (bullseye)
Kernel: Linux 6.1.21-v8+
Architecture: arm64

I then ran the following Docker run command which set up Home assistant on the following internal LAN url: http://harpi.local:8123/ (harpi.local being the hostname of my RPi):

sudo docker run -d \
--name homeassistant \ 
--privileged \ 
--restart=unless-stopped \
-e TZ=Europe/Brussels \
-v /config/ha:/config \
-v /run/dbus:/run/dbus:ro \
--network=host \
--device=/dev/ttyUSB0:/dev/ttyUSB0 \
--device=/dev/ttyACM0:/dev/ACM0 \
ghcr.io/home-assistant/home-assistant:stable

Note that USB0 is the connection to my Sonoff_Zigbee_3.0_USB_Dongle_Plus and ACM0 is my Velleman VMB1USB interface.

I can access HA perfectly and all integrations (Zigbee dongle and Velbus USB) show up, meaning the mounting in Docker was done successfully. I then installed the velbus-tcp snap package using MDARs script:

mkdir /opt/velbus-tcp
cd /opt/velbus-tcp
wget www.mdar.co.uk/dl/velbus/velbus-tcp.sh -O /opt/velbus-tcp/velbus-tcp.sh
sh velbus-tcp.sh

This was also executed successfully and gave me this output:

Velbus-TCP is now running with these settings
{
        "logging": {
                "output": "stream",
                "type": "info"
        },
        "ntp": {
                "enabled": true,
                "synctime": ""
        },
        "serial": {
                "autodiscover": false,
                "port": "/dev/serial/by-id/usb-Velleman_Projects_VMB1USB_Velbus_USB_interface-if00"
        },
        "tcp": {
                "auth": "true,false",
                "authkey": "velbus,",
                "cert": "/var/snap/velbus-tcp/common/certificate.pem",
                "host": "0.0.0.0,127.0.0.1",
                "pk": "/var/snap/velbus-tcp/common/privkey.pem",
                "port": "27015,6000",
                "relay": "true,true",
                "ssl": "true,false"
        }
}

Now I want to connect to VelbusLink on other devices within the network using the network connection (TCP/IP) using the following Server details:

Host address: harpi.local
Port: 27015
Authentication key:
TLS/SSL connection: Unchecked
Remember password (unsafe): Unchecked

I think I’m connected to the gateway when I press “Finish”. However, I can’t seem to find any modules as it instantly gives me an error when pressing the “Scan” button:

An unexpected error occured, we've disconnected you from the bus.

Does anyone have a solution for this or encountered this error? I hope I provided enough details to replicate my setup.