Scanning with Nexus 5x Bluetooth 4.2 failed

Hi,

I’m trying to scan using a central Nexus 5x using this wonderful library, but in vain. No peripheral is detected.

The same app is working fine with phone like OnePlus One or Honor 5x. Using Sniffator or nRF Connect for Mobile on this Nexus, the peripheral is detected and discovered successfully.

I 've set LogLevel to Verbose, but I got any help.

Is there something known related with Bluetooth 4.2 or with Nexus 5x ? Is Sniffator using react-native-ble-plx or RxAndroidBle directly ? How can I get some more debug to investigate this issue ? I’m still using 0.6.3. Is there any hope that something goes better with 0.6.4 ? Any help would be greatly appreciated.

Thanks in advance. JeanClaude

[jchirschy]

Hello,

Finally, my Nexus 5 discovered successfully a test peripheral (Nordic). It seems to be related to Android Manifest which was not good enough for a pure Android stack : Enabling location was not necessary with other centrals I was using before (my bad).

Having modified Android Manifest, I was facing some weird caching issues apparently. Even an adb kill-server was not enough. Rebooting Mac and Nexus 5x, cleaning, rebuilding and enabling location was the right recipe.

I will try with the peripheral used in production next week. You’re awesome guys with your support…

[Cierpliwy]

I found Nexus 5X in Polidea (Android 8.0.0):

I tested 3 options: manager.startDeviceScan(null, null, ...) - works as expected manager.startDeviceScan([""00e2f93e-3066-4e44-a1fc-83389d174d07""], null,...) - works as expected (16bit UUID) manager.startDeviceScan(["8e0f"], null, ...) - works as expected (128 bit UUID)

I didn’t test for 16bit UUIDs as we don’t have advertising devices with this type of UUID.

Before scanning by services make sure that your device really advertises them. They should be visible in device.serviceUUIDs property. If you can’t find them here but you are sure they should be present, please send me your raw advertisement data:

• in react-native-ble-plx library go to android/src/main/java/com/polidea/reactnativeble/BleModule.java
• put breakpoint in line 278 (for version 0.6.5)
• send me value of rxBleScanResult.getScanRecord() of your device.