nRF UART 2.0 can't scan nRF52 devices on Android 9.0.

[nRFBeginner]

Hi everyone,

I m trying to communicate nRF52832 to an android application " nRF52 UART 2.0" on 9.0.

"nRF52 UART 2.0" app source is from git(https://github.com/NordicPlayground/Android-nRF-UART).

I have two smartphone. One is android 9.0, Another one 4.4. 

That application downloaded at Google store can scan the devices, but "nRF52 UART 2.0" source from git can't scan the devices on android 9.0.

Android 4.4 can.

I wanna know what is problem and resolve the issue.

Thank you for help.

- Eric

[awneil]

Are you using the unmodified SDK example on your nRF52832?

What happens if you download the app from the Android store:

https://play.google.com/store/apps/details?id=com.nordicsemi.nrfUARTv2&hl=en_GB

Can your phone itself (ie, not via other apps) see your device?

Can your phone see any other BLE devices?

Can you see your device using nRF Connect, or any 3rd-Party scanner?

[awneil]

nRFBeginner said:

One is android 9.0

What make & model, exactly?

Works OK on my Sony Xperia XA2 ...

(I downloaded the app from the Play Store)

[Simonr]

Hi Eric

I've seen a similar issue with the nRF UART v2.0 application and Android 9.0 where the pairing wouldn't work if you have the Location services turned off. Could you try enabling location services in your phone settings?

Do you have location services on or off awneil?

Best regards,

Simon

[nRFBeginner]

Hi awneil again

Are you using the unmodified SDK example on your nRF52832?
- Yes. nRF52 uploaded "ble_app_uart".

What happens if you download the app from the Android store:
- it can scan devices well. But  "nRF52 UART 2.0" git source is not scanning on android 9.0 when Build and upload my smartphon on android studio.

https://play.google.com/store/apps/details?id=com.nordicsemi.nrfUARTv2&hl=en_GB

Can your phone itself (ie, not via other apps) see your device?
- I don't understand

Can your phone see any other BLE devices?
- No. it do not scan nothing.

Can you see your device using nRF Connect, or any 3rd-Party scanner?
 - Yes. nRF toolBox, nRF Connect can scan device.

What make & model, exactly?
Works OK on my Sony Xperia XA2 ...
(I downloaded the app from the Play Store)
- nRF UART 2.0 app is scanning well from the Play Store, the downloaded source from git is not.

thank you.

Eric.

[nRFBeginner]

Hi Simonr

Thank you for comment.

Yes, location service on.

Additional, the downloaded source from git added about the location permission on Android Studio IDE.

Thank you Simonr.

-Eric