At Android 7, Bluetooth is sometimes not connected

[???]

When we develop Bluetooth products, we find that in Android 6 APP, Bluetooth devices can connect normally, but at Android 7 or above, sometimes it doesn't connect to Bluetooth. Is this related to your SDK? Now I use SDK10.0.

[SRA]

You’ll get a lot more help if you post a sniffer log, so someone can tell you what is happening.

[???]

When a Bluetooth device is scanned， APP implement “BluetoothGatt gatt=device.connectGatt(this, false, mGattCallback);” device can't connect for a long time.And after a long time, “ mGattCallback” return to the device to disconnect。This happens only on Android 7, and not every time.I want to confirm whether this version of my SDK(S10.0) is relevant.

[MartinBL]

Your SDK version is probably not an issue. But it is hard to say without more information. As user @SRA mentions above it would be very useful if you could provide a sniffer trace. If you have a development kit from Nordic you can use that and our Sniffer solution .

It might also help if you could post any kind of logging information provided by you phone and your peripheral device.