While trying to get outside devices to connect to my own Discovery Server and sync over the internet, I may have come across a bug in SyncThing for Android:
While my Windows machines have no issues connecting to the global announce server or to the fixed public IP of a Windows SyncThing device, Android cannot connect to either! I tried this with the Windows device tethered to the Android device … I also noticed that editing the address for a device in Android, e.g. “myIP.com:22000, dynamic”, turns this into “myIP.com:22000, dynamic”.