The Bluetooth connection is made and immediately disconnected.

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Mon, 02 Jul 2018 04:33:25 GMT

Hi strengthstrong,

Rather than being resolved by switching to SDK14.2 -> SDK15,
It only adjusts the connection time.
It seems that the interval time that was applied to the existing 14.2 was short and the phenomenon occurred.
I did not test NRF_SDH_BLE_CENTRAL_LINK_COUNT by setting it to 1. I always set it to 4 and proceeded to test.

RE: The Bluetooth connection is made and immediately disconnected.

strengthstrong — Sat, 30 Jun 2018 06:03:11 GMT

What is the problem and how is sdk14.2 solved? Multiple connections cannot set NRF_SDH_BLE_CENTRAL_LINK_COUNT 1 to 1
Isn't it only connected to one device?

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Thu, 31 May 2018 07:47:12 GMT

Hi,
After migrating to SDK15
This error seems to have been resolved.
Thanks.

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Tue, 29 May 2018 06:06:31 GMT

Hi, Edvin.

I am currently migrating from SDK14.1 to SDK15. After migrating, we'll try this test and contact you again if we get an error. Thank you.

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Fri, 25 May 2018 05:50:45 GMT

hi, Edvin.

I will confirm that you have advised and will test.
I will leave a comment after the test.

RE: The Bluetooth connection is made and immediately disconnected.

Edvin — Wed, 23 May 2018 07:44:18 GMT

Thank you. It doesn't seem like the peripheral responds at all. May I ask what kind of device the peripheral is? Is it something you are developing, or is it a product already on the marked?

If it is something that you are developing, are you able to debug that device and see if you get a connection event?

From the sniffer log, it looks like the connection is never established (as is confirmed by the 0x3E disconnect reason). But the peripheral has a break in the advertisements after the CONNECT_REQ packet, so something is happening, but the peripheral goes silent for a few seconds, then it continues to advertise.

Out of curiosity, can you try to change to the following (in sdk_config.h)

#define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 0
#define NRF_SDH_BLE_CENTRAL_LINK_COUNT 1
#define NRF_SDH_BLE_TOTAL_LINK_COUNT 1

And see if anything changes in the sniffer log?

Best regards,

Edvin

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Wed, 23 May 2018 02:06:09 GMT

devzone.nordicsemi.com/.../connect_5F00_failed.pcapng

Here it is.

RE: The Bluetooth connection is made and immediately disconnected.

Edvin — Tue, 22 May 2018 09:16:34 GMT

The PCA10056 is not yet supported. The PCA10040 and PCA10028 (and PCA10031) is currently supported.

However, you got the sniffer up and running. Could you send the entire snifferlog (.pcapng file) ?

Best regards,

Edvin

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Thu, 17 May 2018 08:21:04 GMT

Hi,
Fortunately for me, I had a PCA10028 board, installed the sniffer and observed the packets.

I think this part is probably what I said.

Do you think you know what the problem is?

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Thu, 17 May 2018 02:14:26 GMT

Additionally,
The NRF52840DK does not support Sniffer, is it?

RE: The Bluetooth connection is made and immediately disconnected.

jwcheon — Thu, 17 May 2018 01:08:35 GMT

Hi Edvin,
Thanks for giving me the answer.

It is not exactly a connect, but after a CONNECTED event occurs on_ble_evt,
Seems to be DISCONNECTED immediately.

The device I'm trying to connect to is not the NRF Board, but the TI Chip Board.
I have not seen the sniffer yet.

RE: The Bluetooth connection is made and immediately disconnected.

Edvin — Wed, 16 May 2018 13:44:05 GMT

Hello,

What do you mean by: "If the device is attached to NRF52DK, the connection will be disconnected immediately after the DISCONNECTED event occurs."?

By "attached", do you mean connected via BLE?

Disconnect reason 0x3E is BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED. What device are you trying to connect to the nRF52DK? Do you have a sniffer trace?

Best regards,

Edvin