Gateway has not never been seen

I have this issue. I installed chirpstack V4 in my computer and I trying to connect LPS8 V2 dragino gateway via Semtech UDP, but it is impossible for me. I followed the documentation in

And in the terminal there’s not problem if I command:

systemctl status chirpstack:

systemctl status chirpstack-gateway-bridge.service:

systemctl status mosquitto.service:

Please help me, you are my last hope.

Where do you install ChirpStack gateway bridge? On the gateway or on Ubuntu server?
If you install it on Ubuntu server, have you opened port UDP/1700 (yes, UDP) on the Ubuntu server?