RE: How to implement the get report request function in the SDK 15.3.0 hid example? Please provide a function example?

peter.min — Thu, 02 Apr 2020 01:41:01 GMT

Thank you

RE: How to implement the get report request function in the SDK 15.3.0 hid example? Please provide a function example?

Kenneth — Wed, 01 Apr 2020 09:25:46 GMT

I updated my reply with inline code.

Best regards,
Kenneth

RE: How to implement the get report request function in the SDK 15.3.0 hid example? Please provide a function example?

peter.min — Wed, 01 Apr 2020 03:04:10 GMT

I can't visit your sample website. Please send the sample here or my email.

RE: How to implement the get report request function in the SDK 15.3.0 hid example? Please provide a function example?

Kenneth — Tue, 31 Mar 2020 13:19:35 GMT

Hi,

The HIDS module keeps track of attribute values for each connection object (handle) and uses this tracked state to respond to a GATT client read / write operations. In general you can refer to the hids_init() in ble_app_hids_keyboard example on how to configure the HIDS module (for instance set report map and the number of feature reports supported).

If you want to set a non-zero value for feature reports there are two ways:

1. You can use the following function:
https://gist.github.com/kapi-no/ce902e1aed6aac57eae2c6a3eabf7b58

uint32_t ble_hids_feat_rep_set(ble_hids_t * p_hids,
                               uint8_t      rep_index,
                               uint16_t     len,
                               uint8_t      offset,
                               uint16_t     conn_handle,
                               uint8_t    * p_feat_rep)
{
    VERIFY_PARAM_NOT_NULL(p_hids);
    VERIFY_PARAM_NOT_NULL(p_feat_rep);

    ret_code_t err_code;
    uint8_t  * p_rep_data;
    uint8_t    index;

    if (rep_index >= p_hids->feature_rep_count)
    {
        return NRF_ERROR_INVALID_PARAM;
    }

    err_code = blcm_link_ctx_get(p_hids->p_link_ctx_storage,
                                 conn_handle,
                                 (void *) &p_rep_data);
    VERIFY_SUCCESS(err_code);

    p_rep_data += sizeof(ble_hids_client_context_t) + BOOT_KB_INPUT_REPORT_MAX_SIZE +
                  BOOT_KB_OUTPUT_REPORT_MAX_SIZE + BOOT_MOUSE_INPUT_REPORT_MAX_SIZE;

    for (index = 0; index < p_hids->inp_rep_count; index++)
    {
        p_rep_data += p_hids->p_inp_rep_init_array[index].max_len;
    }

    for (index = 0; index < p_hids->outp_rep_count; index++)
    {
        p_rep_data += p_hids->p_outp_rep_init_array[index].max_len;
    }

    for (index = 0; index < rep_index; index++)
    {
        p_rep_data += p_hids->p_feature_rep_init_array[index].max_len;
    }

    // Copy the requested feature report data
    if (len + offset <= p_hids->p_feature_rep_init_array[rep_index].max_len)
    {
        memcpy(p_rep_data + offset, p_feat_rep, len);
    }
    else
    {
        return NRF_ERROR_INVALID_LENGTH;
    }

    return NRF_SUCCESS;
}

You need to call the ble_hids_feat_rep_set() when you handle the BLE_GAP_EVT_CONNECTED event from Softdevice to set a non-zero value for the feature report(s).

2. Open ble_hids.c and go to on_report_value_read_auth(), then change:
auth_read_params.params.read.update = 0; // Set to 0.

Then calling sd_ble_gatts_value_set() after ble_hids_init() should work, for instance:
err_code= sd_ble_gatts_value_set(m_conn_handle,
m_hids.feature_rep_array[FEATURE_REPORT_INDEX]->char_handles.value_handle,
&gatts_value);

I hope you can use one of the suggestions above.

Best regards,
Kenneth