Need help with NodeLight? Start with the manual, or write to me.
Email: miguelvirt@gmail.com. Please include your phone model, its iOS or Android version and the brand and model of your Art-Net node.
Check that the phone is on the same Wi-Fi as the node and that Output is on in Setup. On iPhone, also check that NodeLight is allowed on the local network (Settings → Privacy & Security → Local Network).
Check the universe and start address of each light against the fixture's DMX address, and that Blackout is off and Grand Master is up.
Open Setup and tap Restore Purchase, signed in with the Apple Account or Google account you bought with.
Use Export File in the folder menu, then Import File on the new phone — show files work on both iPhone and Android. On iPhone, shows are also in your iCloud or computer backup.
More answers in the Troubleshooting chapter of the manual.