How to connected severals smartphone HID Keyboard

RE: How to connected severals smartphone HID Keyboard

Kenneth — Thu, 07 Apr 2022 14:40:18 GMT

The ble_advertising_init() will cycle through advertising as configured by the parameters supplied. The advertisement will throw a callback in on_adv_evt() each time it change mode, and finally when all modes have elapsed it throw the BLE_ADV_EVT_IDLE event in on_adv_evt(). In this case you can either go to sleep or start advertisment again by for instance calling ble_advertising_start() or ble_advertising_restart_without_whitelist().

Kenneth

RE: How to connected severals smartphone HID Keyboard

alexandre trilles — Thu, 07 Apr 2022 14:25:12 GMT

Good Morning Kenneth,

thanks for information, I 'm going to see accurately examples .

On the same example HID Keyboard, my application is always power on. I have so put it comment sleep_mode() function into static void on_adv_evt(ble_adv_evt_t ble_adv_evt), I have the same problem as this post:

"LED 1 blinks indicating that it is advertising, and for a few minutes it is visible in nRF Connect. But, after approximately 5 minutes the device is no longer visible. However, the LED continues to blink as though the device is still advertising."

this is the POST: Completely disabling sleep mode - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

I looked at the following function "advertising_init" but nothing tells me how to set an infinite time with a value of 0 !

/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t               err_code;
    uint8_t                adv_flags;
    ble_advertising_init_t init;

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

    adv_flags                            = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = adv_flags;
    init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_whitelist_enabled          = true;
    init.config.ble_adv_directed_high_duty_enabled = true;
    init.config.ble_adv_directed_enabled           = false;
    init.config.ble_adv_directed_interval          = 0;
    init.config.ble_adv_directed_timeout           = 0;
    init.config.ble_adv_fast_enabled               = true;
    init.config.ble_adv_fast_interval              = APP_ADV_FAST_INTERVAL;
    init.config.ble_adv_fast_timeout               = APP_ADV_FAST_DURATION;
    init.config.ble_adv_slow_enabled               = true;
    init.config.ble_adv_slow_interval              = APP_ADV_SLOW_INTERVAL;
    init.config.ble_adv_slow_timeout               = APP_ADV_SLOW_DURATION;

    init.evt_handler   = on_adv_evt;
    init.error_handler = ble_advertising_error_handler;

    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);
}

For information, I use nRF SDK 17.1.0 and ble_app_hids_keyboard_pca100056_s140

Thanks

Alexandre

RE: How to connected severals smartphone HID Keyboard

Kenneth — Thu, 07 Apr 2022 12:18:12 GMT

Please find this devzone case that explain how a peripheral device can "switch" between central devices by manipulating the gap address. By changing the gap address the peripheral will appear as a new/different device to the central, so you can for instance switch back and forth between gap addresses to control which central you want to connect to:
https://devzone.nordicsemi.com/f/nordic-q-a/37369/switching-keyboard-mouse-between-3-paired-devices

Also see (this one is likely most useful for you, since it contain an example to switch gap address):
https://devzone.nordicsemi.com/f/nordic-q-a/57881/store-custom-application-data-using-peer-manager

You must call ble_advertising_restart_without_whitelist() to advertise without whitelist. OR you configure advertisment in the advertising_init(), e.g.

init.config.ble_adv_whitelist_enabled = false;

Best regards,
Kenneth

RE: How to connected severals smartphone HID Keyboard

alexandre trilles — Thu, 07 Apr 2022 09:45:13 GMT

Hi,

I took the HID Keyboard example again and activated the nrf LOG. With the first phone I connect well and the HID application works well "hello" visible on an editor. But I can't connect the second phone. I have read several posts and I did not understand the following remark:

You could either try to scan without whitelist

POST:

nRF51822 as hid keyboard: how to pair/bond to multiple devices (smartphones) - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

When you try to establish a connection with the second device, advertising with a whitelist is active and this prevents the connection to the second phone. You could either try to scan without whitelist and add second device to the whitelist when it is connected, or you could consider turning off the whitelist completely.

1) How to make "scan without whitelist" ?

below my log connection and disconnection with first smartphone and when I'm to "slow advertising" my second smartphone don't saw the peripheral Nordic_Keyboard, I would like to know how to connect with my second phone without "erase bonds!" with push button 2 ?

<info> app_timer: RTC: initialized.

<info> app: HID Keyboard example started.

<info> app: 	m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8

<info> app: Fast advertising.

<info> app: Slow advertising.

<info> app: Connected

<info> peer_manager_handler: Connection secured: role: Peripheral, conn_handle: 0, procedure: Bonding

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Bonding data, action: Update

<info> app: New Bond, add the peer to the whitelist if possible

<info> app: 	m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Peer rank, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Local database, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Central address resolution, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Local database, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Local database, action: Update

<info> app: High Duty Directed advertising.

<info> app: Disconnected

<info> app: Fast advertising with whitelist.

<info> app: Slow advertising with whitelist.

<info> app_timer: RTC: initialized.

<info> app: HID Keyboard example started.

<info> app: Erase bonds!

<error> peer_manager_handler: Peer deleted successfully: peer_id: 0

<info> peer_manager_handler: All peers deleted.

<info> app: 	m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8

<info> app: Fast advertising.

<info> app: Connected

<info> peer_manager_handler: Connection secured: role: Peripheral, conn_handle: 0, procedure: Bonding

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Bonding data, action: Update

<info> app: New Bond, add the peer to the whitelist if possible

<info> app: 	m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Peer rank, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Local database, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Central address resolution, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Local database, action: Update

<info> peer_manager_handler: Peer data updated in flash: peer_id: 0, data_id: Local database, action: Update

Thank you very much for help

Alexandre