Unable to Find Custom BLE GATT service (UWP)

Question

Laptop

• I can scan my phone, using DeviceWatcher
• I can start initiating connection with my phone, using await BluetoothLEDevice.FromIdAsync(myPhone.Id)
• I can find the custom service, using await bluetoothLeDevice.GetGattServicesForUuidAsync(theUUID), BluetoothCacheMode.Uncached)
• Works perfectly fine! I can read, write, get notification and so on

Desktop

• I can scan my phone (i.e. BLE scanning works fine)

• I CANNOT start initiating connection with my phone UNLESS I pair with it beforehand

• After pairing, I can start initiating connection, but I CANNOT find the custom service

I checked with another custom app called BLE Tool (it's on Google Play Store; one can add services & characteristics & descriptors and change UUIDs), and found out this WORKS in desktop environment as well. I can find all services including my custom service.

Even though I'm using the exact same UUID I used for my app!

The most weird thing is that I can't even find Generic Attribute (0x1801) when I advertise using my app. (Reminder: I can find both GenAtt and my service in laptop environment)

I'm so confused... I haven't changed a single line but it works on laptop and not on desktop......

Does anybody know how to fix this?

Answer 1

Hi,

You needs to verify if your laptop and PC actually have the same version of Windows. You can collect traces using: https://github.com/Microsoft/busiotools/tree/master/bluetooth/tracing

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