Broadcast/Discoverable

Btw I have “LAN Messenger” app. I am having two devices with mobile data. Connected both devices on same ZT network.

But I want to make them discoverable each other. You have written that broadcast not supported in android device. But I am modifying app with host mapping. How can I host map such to make them discoverable. I tried

Localhost → Zerotier Routing IP (my case: 192.168.191.0)

Vice versa

But both not working