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Android version 9 cannot find my device

I am using nRF52832 on my device. I have used SDK13 and softdevice 4.0.5.

On any iOS devices I can scan and connect in the nRFConnect app.

On an older Samsung Galaxy S5 running Android version 5, I can find my device during scan and I connect with the nRFConnect app.

However on a Samsung A20 with Android version 9, I cannot find my device in the nRFConnect app. I have turned on location service and given other necessary permissions, but my device is not being scanned!?!

I am running the latest versions of the nRFConnect app.

What could be the issue?

Parents

0 Ivan Herrera over 6 years ago

When you open the nRFConnect app, press the top left drawer button and click on "Device information", does it indicate that you have support for most of the features with a green YES?
0 Jenzo over 6 years ago in reply to Ivan Herrera

yes
0 Aleksander Nowakowski over 6 years ago in reply to Jenzo

Hi, do you have Location enabled in the Quick Settings on your Samsung phone? If so, try denying and granting again the location permission to nRF Connect in Settings -> Applications.
0 Aleksander Nowakowski over 6 years ago in reply to Aleksander Nowakowski

Ok, I see you did have enable it. Can you see other devices, but only yours is not showing up there? Or the app does not list any devices?
0 Aleksander Nowakowski over 6 years ago in reply to Aleksander Nowakowski

If you do see other devices, I can imagine only 2 possible reasons:

1. Your device is bonded with the other phone and is advertising directly to it, so the A20 ignores this advertising.

2. Your devices advertises with invalid data, and the A20 is discarding the packet as invalid, but the other phone is simply ignoring it, while still delivering the packet to the app.

You may also check your settings in nRF Connect -> Scanner. Are they all default? Did you enable Offloaded batching, or anything else there?

Are you able to see your device using some other scanner app, like BLE Scanner, etc?
0 Ivan Herrera over 6 years ago in reply to Jenzo

EDIT: Oops didn't see Aleksanders reply.

What are your advertising parameters, specifically the flags set in the advertisingdata?
0 Jenzo over 6 years ago in reply to Ivan Herrera

When running my software on the nRF52 DK I can scan the nRF52 DK! But running my software on my device it does not scan it!?!

Reply

0 Jenzo over 6 years ago in reply to Ivan Herrera

When running my software on the nRF52 DK I can scan the nRF52 DK! But running my software on my device it does not scan it!?!

Children

0 Jenzo over 6 years ago in reply to Jenzo

I did have Andreas Bognøy verify my antenna design and also other BLE 5.0 devices can scan my device. Just not the Samsung A20 :( Do you know of any other developers with similar issue?
0 Ivan Herrera over 6 years ago in reply to Jenzo

What is the RSSI at which you're receiving the packets? If the Bluetooth antenna of the Samsung A20 is badly designed or being distorted by the case it is possible that it's just below the threshold at which it can decode the packets.

Can you sniff the advertisement packets? As Aleksander says they might be invalid. You can use your DK as sniffing-tool using: https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE
0 Jenzo over 6 years ago in reply to Ivan Herrera

I read RSSI levels of -50dBm. Why would the packets be invalid? they work on all other smartphones like Huawei, Apple iphone, etc.
0 Jenzo over 6 years ago in reply to Jenzo

Could you please reply?
0 Aleksander Nowakowski over 6 years ago in reply to Jenzo

Try enabling or disabling batching in nRF Connect -> Settings -> Scanner -> Offloaded scan batching. You may also check other Scanning mode, but the default one (Low latency) should work best.