I’m running OpenSUSE leap 15.5, When I was on the linux mint, I was using warpinator but using it on openSUSE is troublesome and I wish there was a linux version of blip but unfortunately there is not.
Wont go inte networking, but assuming networking works between them you can manually specify an IP in the mobile app:
Add a device -> three dots in top right -> add devices by IP.
Bonus: This also works over tailscale and similar apps, making it so you can have an always on connection despite not being home.