Extended advertising (nRF52833 + S140) - Samsung S20+ can't connect, Huawei P30 can

[MatevzB]

So, we have a problem that the new Samsung S20+ phone is not able to connect to the nRF52833 if extended advertising is enabled (using nRF Connect for Mobile app).

The phone can see the device, but fails to establish the connection with the device in either PHY_1M or PHY_CODED modes. There is no event generated in the firmware when connection is being established. The phone shows 'Connecting' and then times out. If extended advertising is disabled, the phone can connect to the device with PHY_1M.

On the other 'hand', we have a Huawei P30, which has no issue connecting to the same device in either mode.

I would contact the Samsung support directly, but I guess Nordic has better 'ties' with appropriate engineers at Samsung...

[Simonr]

Have you tried debugging on the nRF side of things? I think you should be able to get an error code when the connection times out. Could it be that the nRF is bonded to the Huawei device already, which is why it isn't able to connect to the Samsung device?

Also, if you swipe left in the nRFConnect app, you should be able to see a log on the phone side as well, maybe you can see some error code there?

Best regards,

Simon

[MatevzB]

We missed the log entry there - it is Error 133 (0x85): GATT ERROR

The devices are being tested one at a time (no concurrent operation of both phones).