Communication with an unpaired weara fails at 133 as shown below.

[applesan]

Unable to connect to Bonded weara with GATT 133 error.
Currently, there is only one solution, turning on and off Bluetooth in the OS, which temporarily improves the connection but does not fundamentally solve the problem.

10-21 10:17:05:257 D/PairingDeviceSearchFragment(2) : performPairing
10-21 10:17:05:260 D/PairingViewModel(2) : connect
10-21 10:17:05:268 D/wearamanager(26280) : startConnecting:D5:F7:74:DE:3C:6E　＜＜＜＜＝＝＝＝
10-21 10:17:05:272 D/wearamanager(26280) : connectDevice null
10-21 10:17:05:274 D/wearamanager(26280) : connectDeviceForMacAddress
10-21 10:17:05:286 D/wearamanager(26283) : timer bondState null
10-21 10:17:05:289 D/wearamanager(26283) : timer bondState null
10-21 10:17:05:290 D/wearamanager(26281) : connectDeviceForMacAddress device RxBleDeviceImpl{MAC='D5:F7:74:DE:3C:6E', name=weara}
10-21 10:17:05:291 D/wearamanager(26281) : connectDeviceForMacAddress device.connectionState null
10-21 10:17:05:294 D/wearamanager(26281) : connectDeviceForMacAddress device.bluetoothDevice.bondState null
10-21 10:17:05:296 D/wearamanager(26281) : performBond
10-21 10:17:05:322 D/wearamanager(26281) : observeConnectionStateForBond
10-21 10:17:05:323 D/wearamanager(26281) : observeConnectionStateForBond set
10-21 10:17:05:375 D/wearamanager(26287) : observeConnectionStateForBond RxBleConnectionState{CONNECTING}
10-21 10:17:07:079 D/NotificationPosted:(2) : com.weara
10-21 10:17:09:367 D/NotificationPosted:(2) : com.weara
10-21 10:17:10:285 D/wearamanager(26283) : timer bondState RxBleConnectionState{CONNECTING}
10-21 10:17:10:304 D/wearamanager(26283) : timer bondState 10
10-21 10:17:10:422 E/wearamanager(26288) : connectionObservable com.polidea.rxandroidble2.exceptions.BleDisconnectedException: Disconnected from MAC='D5:F7:74:DE:3C:6E' with status 133 (GATT_ERROR)　＜＜＜＜＝＝＝＝　コネクト失敗

[applesan]

Hi, Simonr

Thank you for your quick reply and I'm sorry for the lack of information.

Yes, it is about a wearable device product as you guessed.

We face this GATT_ERROR regardless of the Android version I think. At least it is happening at the following devices:

- Nexus with Android 8
- XPERIA with Android 9
- Pixel with Android 10

After we face the GATT_ERROR, it is not possible to solve the error when connecting, by disabling and enabling the Smartphone Bluetooth setting. 

I will try using the DK to know the detail, but if you have something that might help us to understand the GATT_ERROR, we would appreciate anything.

Thank you,