Reconnect aftter turn off and turn on BT while connected with device

RE: Reconnect aftter turn off and turn on BT while connected with device

TAEYOUNG — Fri, 15 May 2020 04:30:31 GMT

Okay.

For reference

I tried to test that " BLE Connected -> BT Off -> BT On -> BLE Connecting -> Failed connect" on LG V50.

I guess the same issue occurs with LG phones.

Thanks.

RE: Reconnect aftter turn off and turn on BT while connected with device

Sigurd — Tue, 12 May 2020 14:26:45 GMT

From the log you uploaded we have this:

V 10:14:48.558 Connecting to DE:CF:F2:4A:CE:8C...

D 10:14:48.559 gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)

D 10:15:18.566 [Callback] Connection state changed with status: 133 and new state: DISCONNECTED (0)

E 10:15:18.575 Error 133 (0x85): GATT ERROR

I 10:15:18.575 Disconnected

It happens in different occasions. We have observed it on:

1) packet collision
2) CONNECT_REQ missed by the target
3) timeout (30 or 20 seconds after connection was initiated)
4) in general, an expected packet wasn't received or an unexpected was.

It used to be much more common in old days, now we see it less and less with the new phones, but the low-end devices still have a lot of problems with them. Very often it is enough to repeat the last operation, for example the connection request from the phone and it should work. Maybe you could also try to change the advertising interval on the nRF5x, and see if that makes any difference.

RE: Reconnect aftter turn off and turn on BT while connected with device

TAEYOUNG — Sat, 09 May 2020 01:34:51 GMT

I wrote logs on this site.

log content

-[Recconect Success] Ti Product on LG V30 (Android 9)

-[Recconect Fail] nRF5340 Product on LG V30 (Android 9) : BLE code is \zephyr\samples\bluetooth\peripheral

-[Recconect Fail] nRF52832 Product on LG V30 (Android 9)

-[Recconect Success] nRF52832 Product on Samsung Galaxy Note9 (Android 10)

https://blog.naver.com/92-theo/221953267916

RE: Reconnect aftter turn off and turn on BT while connected with device

TAEYOUNG — Sat, 09 May 2020 01:31:30 GMT

Thanks for letting me know this feature.

Let's figure out what's wrong again.

RE: Reconnect aftter turn off and turn on BT while connected with device

Sigurd — Fri, 08 May 2020 14:20:33 GMT

Hi,

Looking at the first video, it seems like the phone is actually trying to connect to the device, but it failed to connect.

Does the log show any error codes? You can bring up the log If you swipe from left to right when in the device tab, or by clicking on the "3 dots button" and click "Show log".

RE: Reconnect aftter turn off and turn on BT while connected with device

TAEYOUNG — Thu, 07 May 2020 21:24:40 GMT

others product made of TI (Texas Instruments) can reconnect.

I guess there are configuration on nRF.