How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

RE: How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

tianfei00 — Fri, 08 Mar 2019 08:00:14 GMT

Hi,

Follow your advice, 0x22 BLE_HCI_STATUS_CODE_LMP_RESPONSE_TIMEOUT error has been resolved when I modified the NRF_SDH_BLE_GATT_MAX_MTU_SIZE as 23.

Thanks a lot.

Best regards,

Tianfei00

RE: How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

Vidar Berg — Thu, 07 Mar 2019 09:27:15 GMT

Hi,

You can find the sniffer downloads here: https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Sniffer/Download#infotabs. But you will need to have another DK/Dongle to sniff with.

The fact that it works with some android phones make me suspect that this is still related to MTU (some android phones does not support longer MTUs). Do you get the "Data len is set to <bytes>" message in your debug log?

Edit: have you changed anything in main.c->ble_evt_handler()?

RE: How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

tianfei00 — Thu, 07 Mar 2019 08:19:48 GMT

Hi,

If any other hardware device will be needed, for example nRF51 Dongle , when I want to use Bluetooth sniffer ?

But actually I do not have any nRF51 Dongle at all. So how can I resolve this error?

Best regards,

Tianfei00

RE: How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

tianfei00 — Thu, 07 Mar 2019 08:08:41 GMT

Hi,

The 0x22 BLE_HCI_STATUS_CODE_LMP_RESPONSE_TIMEOUT error which I encountered is not in all the andriod devices but only some of them.

So whether you have the download address of the Bluetooth sniffer and the detailed user guide of the Bluetooth sniffer to acquire the data which your wanted so you can analysis the reason result in 0x22. Please provide them for me.

Because your official website is difficlut to visit, especially to download files in China. So if you can provide any other download address for me.

Thanks a lot.

Best regards,

Tianfei00

RE: How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

Vidar Berg — Thu, 07 Mar 2019 07:27:45 GMT

Hi,

Can you upload the project or post the changes you made so I can test it here? Alternatively, if you have access to a Bluetooth sniffer, upload a trace showing the packet exchange from connection to disconnect.

Best regards,

Vidar

RE: How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

tianfei00 — Thu, 07 Mar 2019 01:46:54 GMT

Hi Vidar Berg,

Firstly I used the example "ble_app_uart" based nRF5_SDK_15.2.0_9412b96.

Secondly, in my project the code realated to gatt_init() as following:

/**@brief Function for handling events from the GATT library. */
void gatt_evt_handler(nrf_ble_gatt_t * p_gatt, nrf_ble_gatt_evt_t const * p_evt)
{
    if ((m_conn_handle == p_evt->conn_handle) && (p_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED))
    {
        m_ble_nus_max_data_len = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
        NRF_LOG_INFO("Data len is set to 0x%X(%d)", m_ble_nus_max_data_len, m_ble_nus_max_data_len);
    }
    NRF_LOG_DEBUG("ATT MTU exchange completed. central 0x%x peripheral 0x%x",
                  p_gatt->att_mtu_desired_central,
                  p_gatt->att_mtu_desired_periph);
}


/**@brief Function for initializing the GATT library. */
void gatt_init(void)
{
    ret_code_t err_code;

    err_code = nrf_ble_gatt_init(&m_gatt, gatt_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE);
    APP_ERROR_CHECK(err_code);
}

As you mentioned before, but the gatt_init() has already existed in my code. How can I resolve this error.

Many thanks for you.

Best regards,

tianfei00

RE: How to resolve nRF52832 encountering disconnect reason 0x22 LMP Response Timeout when based S132 SoftDevice v6.1.0 ?

Vidar Berg — Wed, 06 Mar 2019 14:19:52 GMT

Hi,

Did you keep the gatt_init() function responsible for handling MTU and DLE requests? I would expect this error if you have removed it.

Best regards,

Vidar