iPhone and Samsung connection issues

RE: iPhone and Samsung connection issues

Kenneth — Sun, 09 Oct 2022 17:01:08 GMT

[quote user="ccrider"]I just received word the reporting team that patch that I sent yesterday fixes the problem when it wasn't meant to it did by happenstance[/quote]

Good to hear the problem is solved, though I must admit I don't understand why this fixes your connection problems.

Kenneth

RE: iPhone and Samsung connection issues

ccrider — Thu, 06 Oct 2022 19:14:16 GMT

Line 15 (gatts_value.len = COMBO_CHAR_DATA_SIZE;) was gatts_value.len = sizeof(COMBO_CHAR_DATA_SIZE.len);

The size was coming back 4 instead of the actual value of COMBO_CHAR_DATA_SIZE or 18. But we would receive 18 characters with only 4 updating.

RE: iPhone and Samsung connection issues

ccrider — Thu, 06 Oct 2022 19:09:05 GMT

I just received word the reporting team that patch that I sent yesterday fixes the problem when it wasn't meant to it did by happenstance. The code below is where a change was made:

uint32_t ble_Combo_value_update(ble_cus_data_t *p_cus, uint8_t combo_data[COMBO_CHAR_DATA_SIZE])
{
    //NRF_LOG_INFO("In ble_Combo_value_update"); 
    if (p_cus == NULL)
    {
        return NRF_ERROR_NULL;
    }

    uint32_t err_code = NRF_SUCCESS;
    ble_gatts_value_t gatts_value;

    // Initialize value struct.
    memset(&gatts_value, 0, sizeof(gatts_value));

    gatts_value.len     = COMBO_CHAR_DATA_SIZE;
    gatts_value.offset  = 0;
    gatts_value.p_value = combo_data;


    // Update database.
    err_code = sd_ble_gatts_value_set(p_cus->conn_handle,
                                      p_cus->Combo_value_handles.value_handle,
                                      &gatts_value);
    if (err_code != NRF_SUCCESS)
    {
        return err_code;// Code fails here because of line above CBC 08/24/2022 
    }

    // Send value if connected and notifying.
    if ((p_cus->conn_handle != BLE_CONN_HANDLE_INVALID)) 
    {
        ble_gatts_hvx_params_t hvx_params;

        memset(&hvx_params, 0, sizeof(hvx_params));

        hvx_params.handle = p_cus->Combo_value_handles.value_handle;
        hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
        hvx_params.offset = gatts_value.offset;
        hvx_params.p_len  = &gatts_value.len;
        hvx_params.p_data = gatts_value.p_value;

        err_code = sd_ble_gatts_hvx(p_cus->conn_handle, &hvx_params);
        if (err_code != NRF_SUCCESS &&
        err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
        err_code != NRF_ERROR_INVALID_STATE &&
        err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING &&
        err_code != BLE_GATTS_EVT_SYS_ATTR_MISSING &&
        /*I'm not entirely sure if ignoring this error could have detrimental effects or not*/
        err_code != NRF_ERROR_RESOURCES)
        {
          APP_ERROR_CHECK(err_code);
        }
    }
    else
    {
        err_code = NRF_ERROR_INVALID_STATE;
    }


    return err_code;
}

RE: iPhone and Samsung connection issues

Kenneth — Thu, 06 Oct 2022 16:31:58 GMT

[quote user="ccrider"]What would be the potential root causes for why some phones have a connection issue and other's do not?[/quote]

I have seen in the past some phones may not "like" that there are BLE procedures starting on very first connection event, this seems to trigger them to enter a bad state. It may also be some new features that is supported by the peripheral and not supported by the phone, in this case the phone should ignore them, yet some old phones may enter a bad state. It can also be some issue with a specific android/ios release or chipset from time to time. It can also be a peripheral that have some strict requirement to specific features or parameters, and if the phone don't apply to these, it may disconnect based on it. So overall, it can be quite a lot of things, though I see less and less of these issues.

Kenneth

RE: iPhone and Samsung connection issues

ccrider — Thu, 06 Oct 2022 14:36:42 GMT

Hello Keith,

What would be the potential root causes for why some phones have a connection issue and other's do not? I am working on Fishbone diagram to help root cause the issue.

RE: iPhone and Samsung connection issues

ccrider — Tue, 04 Oct 2022 21:21:02 GMT

Most of the core BLE code is in the current code. But, we have had 4 months of changes. The Android phones that's been used over those 4 months didn't have the same issue, as the other phone mentioned above. I'll see what I can get with a sniffer.

RE: iPhone and Samsung connection issues

Kenneth — Tue, 04 Oct 2022 20:56:39 GMT

I was mainly interested in firmware yes. I guess you have indirectly answered my question then, that the example as-is likely works, but a change is causing the issue. Unless you are able to pinpoint the change that triggers the issue, then I likely need the sniffer log.

Kenneth

RE: iPhone and Samsung connection issues

ccrider — Tue, 04 Oct 2022 19:29:37 GMT

Hello Keith,

Thanks for help. For question #2 are you referring to the Nordic Firmware or app SW? We used example for the FW and modified, as needed.

RE: iPhone and Samsung connection issues

Kenneth — Tue, 04 Oct 2022 14:06:26 GMT

Hello,

1. We need an on-air sniffer log of working vs. failing, for instance using ellisys, frontline, or our own nrf sniffer for ble:
https://www.nordicsemi.com/Products/Development-tools/nrf-sniffer-for-bluetooth-le
(direct link to user guide: https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_BLE_UG_v4.1.0.pdf)

2. Can you comment if the issue happens with a standard sdk/ncs example as-is (if yes, which release and example), or does it occur after modification to an example (if yes, which release and example, and what modifications have you done).

3. Can you check if you have followed the apple bluetooth guidelines (see chapter 41)?
https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf

Kenneth

RE: iPhone and Samsung connection issues

ccrider — Tue, 04 Oct 2022 12:16:25 GMT

We are using a FWM7BLZ20 Wireless module. So, we can't change the load capacitance and don't know the values at this time. Is there a way to adjust FW wise to make it compatible with most/all smart phones?

RE: iPhone and Samsung connection issues

Kaja — Mon, 03 Oct 2022 10:33:48 GMT

The nordic device

RE: iPhone and Samsung connection issues

ccrider — Fri, 30 Sep 2022 14:39:46 GMT

I tested with a Samsung Galaxy S9 with no connection problems.

RE: iPhone and Samsung connection issues

ccrider — Fri, 30 Sep 2022 14:31:04 GMT

Are you asking in relation to the phones that have an issue or the Nordic device being used?

RE: iPhone and Samsung connection issues

Kaja — Fri, 30 Sep 2022 09:05:12 GMT

Hi,

you have tested with multiple other phones and it works for them?

The crystals you use on your design, what is the CL, load capacitance and what is the values on the load capacitors? Both for 32.768 kHz and 32 MHz.

Best regards,
Kaja