Can you ping the server from your phone successfully? You can use an app like this to check: https://play.google.com/store/apps/details?id=net.he.networktools
Making sure you have layer 3 connectivity first would be a good first step. If you don’t, I would start by troubleshooting at layer 2. Run a packet capture on both your phone and server while trying to connect to determine where the disconnect is. Make sure ARP is resolving properly.
If layer 3 IS working, move up to layer 4 and make sure you are using the correct port, http vs https, etc
I’ve been in the closed beta since February and I can vouch for this game being awesome. It’s been a great way to encourage me to take my dogs on walks and stay healthy. I definitely recommend checking it out.
To the dev, your game has motivated me to learn flutter/dart. I’ve been working with it for four months now and I’m getting close to finishing my first app, so thank you for the inspiration!