Both, the Linux client and the Android client "see" each other. That is, the phone appears in the Linux web interface, and the Linux client appears in the Android app as connected device. However, the sync does not start. The Android app just repeats D/BtSync - PreferencesManager( 5182): isBatteryEnabled true batteryPercent = 82 getListenBatteryValue = 15 D/BTSync - IPUtils( 5182): wifi is connected D/BtSync - PreferencesManager( 5182): enableTraffic battery = true cellular = true D/BtSync - PreferencesManager( 5182): isBatteryEnabled true batteryPercent = 82 getListenBatteryValue = 15 D/BTSync - IPUtils( 5182): wifi is connected in the log.