[Android] Empty array of services is returned

Expected Behavior

After calling bleManager.discoverAllServicesAndCharacteristicsForDevice(), calling .services() on the returned bleDevice should return a non-empty list of services.

Current Behavior

Calling .services() returns an empty array. This might be a pairing issue, since if I pair with the device via Android’s bluetooth menu, it seems to connect without issue and properly returns a non-empty list of services. Restarting the phone also seems to “fix” the issue for me. I assume this issue is related to https://github.com/Polidea/react-native-ble-plx/issues/488 and the “known bug”. Calling connectToDevice() seems to work fine, and the resulting device has the correct name/id.

Steps to Reproduce

1. Put device in pairing mode
2. Connect to device using bleManager.connectToDevice().
3. Call discoverAllServicesAndCharacteristicsForDevice() with the device or using bleManager.
4. Attempt to get services using .services() on the device.
5. An empty services array is returned.

Context

• Library version: 2.0.1
• Platform and version: Android 10 (SDK 29)
• Phone: Samsung Galaxy S20

[TwoTenPvP]

Could you share what configuration problem it was? It could be helpful for anyone else that would stumble upon this issue.

I actually still don’t know. I’m running a Bluez server. And whenever a connection request comes in it gets disconnected by the server. So a server side issue, unrelated to this library.

[TwoTenPvP]

I think I have a related issue.

I am trying to find my device by serviceUUID and that does not work.

uuids = ["UUID_GOES_HERE"]
bluetoothManager.startDeviceScan(uuids, null, (error, device) => { }

The above code never finds anything.

If I remove the uuids argument to make it find everything, then manually filter on the MAC address to get the reported device object. Getting it’s .serviceUUIDs also returns null.

My .name field is also empty on Discovery.