I installed Tailscale from the plugins directory (it's really, really weird that such a new device does not have this plugin built in, not does it have any GUI).
I found at the end that in order to use Tailscale, I'll need to do it through SSH, which I did, and it works.
However, the version that is available with Mudi (with the latest update) is 1.32.3-1 which has security issue and Tailscale requires to immediately upgrade to 1.74, which I cannot find for my device.
Will this issue be addressed in an upcoming firmware? (I've seen somewhere else a script to update Tailscale, but this version only crashes with "illegal instructions" on the Mudi)
I use Mudi E750 V1 with tailscale and update manually, as follows;
SSH into Mudi (I use WinSCP for this) and navigate to the folder /usr/sbin. There are two files here that must be replaced, tailscale and tailscaled.
Confirm your CPU architecture (Mudi/E750V1 is MIPS) by running the following command:
root@GL-E750:~# cat /proc/cpuinfo
Download the latest file from https://pkgs.tailscale.com/stable/#static . For Mudi these are in the Static binaries (other distros) section, the one you need for Mudi E750 V1 is "mips"
Replace the two old files in folder /usr/sbin with the two new files from the latest mips binary.
Change the new file permissions to match the old file permissions. Correct permissions are: rwxr-xr-x
Start tailscale by command:
root@GL-E750:/usr/sbin# tailscale up