nRF52832 connection problem with some android device

[asdf]

Hi, I'm using nRF52832 with sdk 13.1.0(softdevice 4.0.2). I had trouble to connect nRF52832 in some android smart device.When I restart Bluetooth,Sometimes there are problems connecting(GATT ERROR 133).Then never connected to the device unless I restart the Bluetooth or lock screen.(Only some devices).

[Hung Bui]

Could you provide some more information about your Android device ? We have seen error 133 quite often in the past but didn't have a clear explanation why it happens. You can try to add some delay before you do anything after connection established. As you can read about it here and here.

Also, please try using the nRFConnect app for testing.

[asdf]

Your sharing is useful。Thank you very much.