reason for Disconnect 0x22 error

[Youngsoo.bae]

dear Devzone

A disconnect error 0x22 occurred.

I know that error 0x22 is LMP_RESPONSE_TIMEOUT / LL_RESPONSE_TIMEOUT.

However, the location of the error and the reason for its occurrence are not clear. I will also attach a log of this.

Disconnect reason error 0x22.zip

and

#ifndef NRF_SDH_BLE_GATT_MAX_MTU_SIZE

#if 1

#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 67

#etc

#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 136

#endif

#endif

Making it like above seems to make the error go away, but is it related to this error?

Ask again because the situation you saw in other questions is different.

I used nRF52832 (NFC, 2Mbps) and nexsus6.

thank!

youngsoo.bae

[Kenneth]

Can you try to add the delay in nrf_ble_gatt.c go on_connected_evt() as suggested here:

Best regards,
Kenneth

[Youngsoo.bae]

Hi Kenneth

If I add delay, Is it anything wrong with the performance?

If there is no problem, do I have to have some delay?

thank!

[Kenneth]

I would like you to try first to check if the problem is fixed. I suspect a race condition in the central if the MTU exchange is started directly on connection (likely caused by some "bug" in the central device). If the issue is caused by a race condition then using 50-100ms delay before MTU exchange start is a good idea. There should be no problem using a delay no.

[Youngsoo.bae]

thank for your answer!

I'm very sorry, but can you take a look at the behavior of phone in an error situation?

We don't want to put in a delay. because impossible to confirm that the error disappears with the delay.

The rental period for the Nexus 6 is over.

thank you!

youngsoo.bae

[Kenneth]

I asked you to do a test by adding one line of code and you have not done so? During debugging we rely on you to test code to narrow down the root cause.

What SDK and SD are you using?

Does it happens every time with nexus 6? Or does it happen only sometimes?

Does it happen with other phones than nexus 6?

Does it happen when you try to disconnect?

Best regards,
Kenneth