HID Keyboard + Custom GATT

RE: HID Keyboard + Custom GATT

Joakim Jakobsen — Wed, 25 Sep 2019 07:18:55 GMT

Yes, you are allowed to advertise the full device name. As long as there is enough space in the advertising packet, there is no problem advertising the full name.

Best regards,
Joakim

RE: HID Keyboard + Custom GATT

bscdb — Wed, 25 Sep 2019 07:04:47 GMT

Thank you for your reply. I again changed the advertising_init() to accommodate the full device name. I this permissible?

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;
    memset(&init, 0, sizeof(init));
    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    //init.advdata.uuids_complete.uuid_cnt = 1;//sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    //init.advdata.uuids_complete.p_uuids  = m_adv_uuids;
	//init.advdata.uuids_complete.p_uuids  = &m_adv_uuids[1];
	/*new*/
	init.config.ble_adv_whitelist_enabled          = false;//true;	
	init.srdata.name_type               = BLE_ADVDATA_NO_NAME;//BLE_ADVDATA_NO_NAME;
	init.srdata.uuids_complete.uuid_cnt = 1;//sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
	init.srdata.uuids_complete.p_uuids  = &m_adv_uuids[0];
	init.srdata.uuids_more_available.uuid_cnt = 1;
	init.srdata.uuids_more_available.p_uuids = &m_adv_uuids[1];
	/*new*/
	init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
	init.config.ble_adv_extended_enabled = true;
	
    advertising_config_get(&init.config);
    init.evt_handler = on_adv_evt;
    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);
    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

Will it affect the scanning for services by host after the bluetooth connection?

RE: HID Keyboard + Custom GATT

Joakim Jakobsen — Wed, 25 Sep 2019 06:34:17 GMT

Your advertising init looks ok. You don't need to include the init.srdata.name_type in the srdata.

[quote user="bop123"][/quote]

Is this: init.config.ble_adv_extended_enabled = true; required?

It's not required. Extended advertising is a BT5 feature which allows you to extend the advertising packet from 31 bytes and up to 255 bytes.

[quote user="bop123"][/quote]

, how do I add all of these to advertisement packet?

Both the Custom service and the DFU service is a 128-bit service. So unless extended advertising is used, the will use a lot of the available space in the advertising packet. As you effectively have 29 bytes of payload available in the advertising packet (or 29 x2 with scan response) you can only fit one 128-bit service in each advertising packet.

Best regards,
Joakim

RE: HID Keyboard + Custom GATT

bscdb — Mon, 23 Sep 2019 23:50:18 GMT

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;
    memset(&init, 0, sizeof(init));
    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.advdata.uuids_complete.uuid_cnt = 1;//sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    //init.advdata.uuids_complete.p_uuids  = m_adv_uuids;
	init.advdata.uuids_complete.p_uuids  = &m_adv_uuids[0];
	/*new*/
	init.srdata.name_type               = BLE_ADVDATA_NO_NAME;
	init.srdata.uuids_complete.uuid_cnt = 1;//sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
	init.srdata.uuids_complete.p_uuids  = &m_adv_uuids[1];
	/*new*/
	init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
	init.config.ble_adv_extended_enabled = true;
	
    advertising_config_get(&init.config);
    init.evt_handler = on_adv_evt;
    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);
    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

This seems to work.

Is this

init.config.ble_adv_extended_enabled = true;

required?

What if I wanted to add

1. Custom gatt service

2. HID service

3. DFU service

, how do I add all of these to advertisement packet?

Should the uuids_more_available be used?

RE: HID Keyboard + Custom GATT

bscdb — Mon, 23 Sep 2019 12:02:24 GMT

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;
    memset(&init, 0, sizeof(init));
    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.uuids_complete.p_uuids  = m_adv_uuids;
	
	/*new*/
	init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
	
    advertising_config_get(&init.config);
    init.evt_handler = on_adv_evt;
    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);
    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

devzone.nordicsemi.com/.../ble_5F00_app_5F00_buttonless_5F00_dfu_5F00_custom.zip

I have also attached the full code.

Also what adjustments do I need to make in advertising data for the full device name to be visible with custom gatt & dfu service? I removed the hid service.

Thanks.

RE: HID Keyboard + Custom GATT

Joakim Jakobsen — Mon, 23 Sep 2019 07:33:01 GMT

Ok, I misunderstood your question.

Could you please upload your advertising_init() function so that I can see how you tried adding the scan response data.

Best regards,
Joakim

RE: HID Keyboard + Custom GATT

bscdb — Thu, 19 Sep 2019 11:33:09 GMT

Yes know but according to https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-advertising-a-beginners-tutorial, there seems to be a workaround to extend the packet to 62 bytes. Can you please help me with that, that is what I was asking in my question above

RE: HID Keyboard + Custom GATT

Joakim Jakobsen — Thu, 19 Sep 2019 11:13:43 GMT

Hi.

It seems that your advertising packet is full, that is why you are seeing the shortened "Nord" advertising name.

Note that the advertising packet will only fit 31 bytes of data.

Best regards,
Joakim