https://devzone.nordicsemi.com/f/nordic-q-a/58124/peripheral-device-keep-advertising-during-connectionHi , The device required to keep advertising during the connection established. It is human interface device which mean it is peripheral device as well. I would like to know whether there is any sample I could take as reference for the structureen-USTelligent Community 13Wed, 18 Mar 2020 10:35:48 GMThttps://devzone.nordicsemi.com/thread/240398?ContentTypeID=1Wed, 18 Mar 2020 10:35:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7c4ae558-d28f-483b-9f83-69c499302575Sigurd[quote userid="74727" url="~/f/nordic-q-a/58124/peripheral-device-keep-advertising-during-connection/237957"]erase_bonds = false[/quote] <p>This could cause issues if you are keeping the bond on the central/phone. If you are keeping the bond on the central/phone, then&nbsp;in your&nbsp;on_connected() and on_disconnected() functions, try to change advertising_start(true); to&nbsp;advertising_start(false); instead. You might also need to remove&nbsp;delete_bonds() from the BLE_GAP_EVT_DISCONNECTED handling. This <a href="https://jimmywongiot.com/2020/01/14/ble-hid-multiple-peripherl-example-on-nordic-nrf52-series/">blog post</a> might be helpful.</p> [quote userid="74727" url="~/f/nordic-q-a/58124/peripheral-device-keep-advertising-during-connection/237957"]It show as below, 0x13 mean&nbsp;BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION[/quote] <p>BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION means that the central/phone has disconnected the link. If you take a look at the log on the phone side (swipe from left to right in nRFConnect) perhaps you could fine some more information there about why the phone disconnected.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/237957?ContentTypeID=1Wed, 04 Mar 2020 09:12:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8bbfc3ac-1b56-45b0-864c-489c56795966CY<p>Hi Sigurd,</p> <p>I just tried to&nbsp;modified as below:</p> <p>erase_bonds = false</p> <p>set all related advertising_start(false)&nbsp;</p> <p>block the delete_bond() in the case BLE_GAP_EVT_DISCOONECTED</p> <p></p> <p>As the result, it could connect with windows without dropped and connect with nRF connect at the same time.</p> <p>Somehow it show the message during I connect with PC.<pre class="ui-code" data-mode="text">00&gt; &lt;info&gt; app: Connection with link 0x0 established. 00&gt; &lt;info&gt; app: m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8 00&gt; &lt;info&gt; app: Fast advertising. 00&gt; &lt;info&gt; peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Bonding, error: 133</pre></p> <p>And &quot;<span>when the device is connected with 2 host once the device disconnect with on of them. It will disconnect for all.&quot; It has been solved after the modification.</span></p> <p><span>It show as below, 0x13 mean&nbsp;BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION, seem normal.</span></p> <p><span><pre class="ui-code" data-mode="text">00&gt; &lt;info&gt; app: Connected 00&gt; &lt;info&gt; app: Connection with link 0x1 established. 00&gt; &lt;info&gt; app: Fast advertising. 00&gt; &lt;info&gt; app: Disconnected 00&gt; &lt;info&gt; app: Connection 0x1 has been disconnected. Reason: 0x13 00&gt; &lt;info&gt; app: Connected 00&gt; &lt;info&gt; app: Connection with link 0x1 established. 00&gt; &lt;info&gt; app: Fast advertising. 00&gt; &lt;info&gt; app: Disconnected</pre></span></p> <p><span></span></p> <p><span>However, after the disconnection the device could not be connectable anymore.</span></p> <p><span>I suppose it cause by the bonding information.</span></p> <p><span>Could you guide me how to fixed it?</span></p> <p><span></span></p> <p><span>Thanks.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/237915?ContentTypeID=1Wed, 04 Mar 2020 06:51:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e10be12e-ce16-4b14-b536-4863211c95c0CY<p>Hi Sigurd,</p> <p>After I trying to implant the program into my main.c as below code.</p> <p><pre class="ui-code" data-mode="c_cpp"> #define HID_MULT 1 #define DEVICE_NAME &quot;HID_MULTI&quot; /**&lt; Name of device. Will be included in the advertising data. */ #define MANUFACTURER_NAME &quot;CY&quot; /**&lt; Manufacturer. Will be passed to Device Information Service. */ #define APP_BLE_OBSERVER_PRIO 3 /**&lt; Application&#39;s BLE observer priority. You shouldn&#39;t need to modify this value. */ #define APP_BLE_CONN_CFG_TAG 1 /**&lt; A tag identifying the SoftDevice BLE configuration. */ #define BATTERY_LEVEL_MEAS_INTERVAL APP_TIMER_TICKS(2000) /**&lt; Battery level measurement interval (ticks). */ #define MIN_BATTERY_LEVEL 5 /**&lt; Minimum simulated battery level.*/ #define MAX_BATTERY_LEVEL 100 /**&lt; Maximum simulated battery level. */ #define BATTERY_LEVEL_INCREMENT 5 /**&lt; Increment between each simulated battery level measurement. */ #define PNP_ID_VENDOR_ID_SOURCE 0x02 /**&lt; Vendor ID Source. */ #define PNP_ID_VENDOR_ID 0x413C /**&lt; Vendor ID. */ #define PNP_ID_PRODUCT_ID 0x81D5 /**&lt; Product ID.*/ #define PNP_ID_PRODUCT_VERSION 0x0001 /**&lt; Product Version. */ #define APP_ADV_FAST_INTERVAL 0x0028 /**&lt; Fast advertising interval (in units of 0.625 ms. This value corresponds to 25 ms.). */ #define APP_ADV_SLOW_INTERVAL 0x00A0 /**&lt; Slow advertising interval (in units of 0.625 ms. This value corrsponds to 100 ms). */ #define APP_ADV_FAST_DURATION 0 /**&lt; The advertising duration of fast advertising in units of 10 milliseconds. */ #define APP_ADV_SLOW_DURATION 18000 /**&lt; The advertising duration of slow advertising in units of 10 milliseconds. */ /*lint -emacro(524, MIN_CONN_INTERVAL) // Loss of precision */ #define MIN_CONN_INTERVAL MSEC_TO_UNITS(7.5, UNIT_1_25_MS) /**&lt; Minimum connection interval (7.5 ms) */ #define MAX_CONN_INTERVAL MSEC_TO_UNITS(15, UNIT_1_25_MS) /**&lt; Maximum connection interval (15 ms). */ #define SLAVE_LATENCY 20 /**&lt; Slave latency. */ #define CONN_SUP_TIMEOUT MSEC_TO_UNITS(3000, UNIT_10_MS) /**&lt; Connection supervisory timeout (3000 ms). */ #define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000) /**&lt; Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */ #define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000) /**&lt; Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */ #define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**&lt; Number of attempts before giving up the connection parameter negotiation. */ #define SEC_PARAM_BOND 1 /**&lt; Perform bonding. */ #define SEC_PARAM_MITM 0 /**&lt; Man In The Middle protection not required. */ #define SEC_PARAM_LESC 0 /**&lt; LE Secure Connections not enabled. */ #define SEC_PARAM_KEYPRESS 0 /**&lt; Keypress notifications not enabled. */ #define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_NONE /**&lt; No I/O capabilities. */ #define SEC_PARAM_OOB 0 /**&lt; Out Of Band data not available. */ #define SEC_PARAM_MIN_KEY_SIZE 7 /**&lt; Minimum encryption key size. */ #define SEC_PARAM_MAX_KEY_SIZE 16 /**&lt; Maximum encryption key size. */ #define OUTPUT_REPORT_INDEX 0 /**&lt; Index of Output Report. */ #define OUTPUT_REPORT_MAX_LEN 1 /**&lt; Maximum length of Output Report. */ #define INPUT_REPORT_KEYS_INDEX 0 /**&lt; Index of Input Report. */ #define OUTPUT_REPORT_BIT_MASK_CAPS_LOCK 0x02 /**&lt; CAPS LOCK bit in Output Report (based on &#39;LED Page (0x08)&#39; of the Universal Serial Bus HID Usage Tables). */ #define INPUT_REP_REF_ID 0 /**&lt; Id of reference to Keyboard Input Report. */ #define OUTPUT_REP_REF_ID 0 /**&lt; Id of reference to Keyboard Output Report. */ #define FEATURE_REP_REF_ID 0 /**&lt; ID of reference to Keyboard Feature Report. */ #define FEATURE_REPORT_MAX_LEN 2 /**&lt; Maximum length of Feature Report. */ #define FEATURE_REPORT_INDEX 0 /**&lt; Index of Feature Report. */ #define MAX_BUFFER_ENTRIES 5 /**&lt; Number of elements that can be enqueued */ #define BASE_USB_HID_SPEC_VERSION 0x0101 /**&lt; Version number of base USB HID Specification implemented by this application. */ #define INPUT_REPORT_KEYS_MAX_LEN 8 /**&lt; Maximum length of the Input Report characteristic. */ #define DEAD_BEEF 0xDEADBEEF /**&lt; Value used as error code on stack dump, can be used to identify stack location on stack unwind. */ #define SCHED_MAX_EVENT_DATA_SIZE APP_TIMER_SCHED_EVENT_DATA_SIZE /**&lt; Maximum size of scheduler events. */ #ifdef SVCALL_AS_NORMAL_FUNCTION #define SCHED_QUEUE_SIZE 20 /**&lt; Maximum number of events in the scheduler queue. More is needed in case of Serialization. */ #else #define SCHED_QUEUE_SIZE 10 /**&lt; Maximum number of events in the scheduler queue. */ #endif #define MODIFIER_KEY_POS 0 /**&lt; Position of the modifier byte in the Input Report. */ #define SCAN_CODE_POS 2 /**&lt; The start position of the key scan code in a HID Report. */ #define MAX_KEYS_IN_ONE_REPORT (INPUT_REPORT_KEYS_MAX_LEN - SCAN_CODE_POS)/**&lt; Maximum number of key presses that can be sent in one Input Report. */ // General application timer settings. #define APP_TIMER_PRESCALER 16 // RTC PRESCALER register value. #define APP_TIMER_OP_QUEUE_SIZE 2 // Size of timer operation queues. #define UART_TX_BUF_SIZE 256 /**&lt; UART TX buffer size. */ #define UART_RX_BUF_SIZE 256 /**&lt; UART RX buffer size. */ /**Buffer queue access macros * * @{ */ /** Initialization of buffer list */ #define BUFFER_LIST_INIT() \ do \ { \ buffer_list.rp = 0; \ buffer_list.wp = 0; \ buffer_list.count = 0; \ } while (0) /** Provide status of data list is full or not */ #define BUFFER_LIST_FULL() \ ((MAX_BUFFER_ENTRIES == buffer_list.count - 1) ? true : false) /** Provides status of buffer list is empty or not */ #define BUFFER_LIST_EMPTY() \ ((0 == buffer_list.count) ? true : false) #define BUFFER_ELEMENT_INIT(i) \ do \ { \ buffer_list.buffer[(i)].p_data = NULL; \ } while (0) /** @} */ /** Abstracts buffer element */ typedef struct hid_key_buffer { uint8_t data_offset; /**&lt; Max Data that can be buffered for all entries */ uint8_t data_len; /**&lt; Total length of data */ uint8_t * p_data; /**&lt; Scanned key pattern */ ble_hids_t * p_instance; /**&lt; Identifies peer and service instance */ } buffer_entry_t; STATIC_ASSERT(sizeof(buffer_entry_t) % 4 == 0); /** Circular buffer list */ typedef struct { buffer_entry_t buffer[MAX_BUFFER_ENTRIES]; /**&lt; Maximum number of entries that can enqueued in the list */ uint8_t rp; /**&lt; Index to the read location */ uint8_t wp; /**&lt; Index to write location */ uint8_t count; /**&lt; Number of elements in the list */ } buffer_list_t; STATIC_ASSERT(sizeof(buffer_list_t) % 4 == 0); APP_TIMER_DEF(m_battery_timer_id); /**&lt; Battery timer. */ BLE_HIDS_DEF(m_hids, /**&lt; Structure used to identify the HID service. */ NRF_SDH_BLE_TOTAL_LINK_COUNT, INPUT_REPORT_KEYS_MAX_LEN, OUTPUT_REPORT_MAX_LEN, FEATURE_REPORT_MAX_LEN); BLE_BAS_DEF(m_bas); /**&lt; Structure used to identify the battery service. */ NRF_BLE_GATT_DEF(m_gatt); /**&lt; GATT module instance. */ #if HID_MULT == 0 NRF_BLE_QWR_DEF(m_qwr); /**&lt; Context for the Queued Write module.*/ #else NRF_BLE_QWRS_DEF(m_qwr, NRF_SDH_BLE_TOTAL_LINK_COUNT); static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET; #endif BLE_ADVERTISING_DEF(m_advertising); /**&lt; Advertising module instance. */ APP_TIMER_DEF(m_button_action); /**&lt;press button event. */ static bool m_in_boot_mode = false; /**&lt; Current protocol mode. */ static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID; /**&lt; Handle of the current connection. */ static sensorsim_cfg_t m_battery_sim_cfg; /**&lt; Battery Level sensor simulator configuration. */ static sensorsim_state_t m_battery_sim_state; /**&lt; Battery Level sensor simulator state. */ static pm_peer_id_t m_peer_id; /**&lt; Device reference handle to the current bonded central. */ static buffer_list_t buffer_list; /**&lt; List to enqueue not just data to be sent, but also related information like the handle, connection handle etc */ static ble_uuid_t m_adv_uuids[] = { {BLE_UUID_HUMAN_INTERFACE_DEVICE_SERVICE, BLE_UUID_TYPE_BLE}, }; static void on_hids_evt(ble_hids_t * p_hids, ble_hids_evt_t * p_evt); /**@brief Callback function for asserts in the SoftDevice. * * @details This function will be called in case of an assert in the SoftDevice. * * @warning This handler is an example only and does not fit a final product. You need to analyze * how your product is supposed to react in case of Assert. * @warning On assert from the SoftDevice, the system can only recover on reset. * * @param[in] line_num Line number of the failing ASSERT call. * @param[in] file_name File name of the failing ASSERT call. */ void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name) { app_error_handler(DEAD_BEEF, line_num, p_file_name); } /**@brief Function for setting filtered whitelist. * * @param[in] skip Filter passed to @ref pm_peer_id_list. */ static void whitelist_set(pm_peer_id_list_skip_t skip) { pm_peer_id_t peer_ids[BLE_GAP_WHITELIST_ADDR_MAX_COUNT]; uint32_t peer_id_count = BLE_GAP_WHITELIST_ADDR_MAX_COUNT; ret_code_t err_code = pm_peer_id_list(peer_ids, &amp;peer_id_count, PM_PEER_ID_INVALID, skip); APP_ERROR_CHECK(err_code); NRF_LOG_INFO(&quot;\tm_whitelist_peer_cnt %d, MAX_PEERS_WLIST %d&quot;, peer_id_count + 1, BLE_GAP_WHITELIST_ADDR_MAX_COUNT); err_code = pm_whitelist_set(peer_ids, peer_id_count); APP_ERROR_CHECK(err_code); } /**@brief Function for setting filtered device identities. * * @param[in] skip Filter passed to @ref pm_peer_id_list. */ static void identities_set(pm_peer_id_list_skip_t skip) { pm_peer_id_t peer_ids[BLE_GAP_DEVICE_IDENTITIES_MAX_COUNT]; uint32_t peer_id_count = BLE_GAP_DEVICE_IDENTITIES_MAX_COUNT; ret_code_t err_code = pm_peer_id_list(peer_ids, &amp;peer_id_count, PM_PEER_ID_INVALID, skip); APP_ERROR_CHECK(err_code); err_code = pm_device_identities_list_set(peer_ids, peer_id_count); APP_ERROR_CHECK(err_code); } /**@brief Clear bond information from persistent storage. */ static void delete_bonds(void) { ret_code_t err_code; NRF_LOG_INFO(&quot;Erase bonds!&quot;); err_code = pm_peers_delete(); APP_ERROR_CHECK(err_code); } /**@brief Function for starting advertising. */ static void advertising_start(bool erase_bonds) { if (erase_bonds == true) { delete_bonds(); // Advertising is started by PM_EVT_PEERS_DELETE_SUCCEEDED event. } else { whitelist_set(PM_PEER_ID_LIST_SKIP_NO_ID_ADDR); ret_code_t ret = ble_advertising_start(&amp;m_advertising, BLE_ADV_MODE_FAST); APP_ERROR_CHECK(ret); } } /**@brief Function for handling Peer Manager events. * * @param[in] p_evt Peer Manager event. */ static void pm_evt_handler(pm_evt_t const * p_evt) { pm_handler_on_pm_evt(p_evt); pm_handler_flash_clean(p_evt); switch (p_evt-&gt;evt_id) { case PM_EVT_PEERS_DELETE_SUCCEEDED: advertising_start(false); break; case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED: if ( p_evt-&gt;params.peer_data_update_succeeded.flash_changed &amp;&amp; (p_evt-&gt;params.peer_data_update_succeeded.data_id == PM_PEER_DATA_ID_BONDING)) { NRF_LOG_INFO(&quot;New Bond, add the peer to the whitelist if possible&quot;); // Note: You should check on what kind of white list policy your application should use. whitelist_set(PM_PEER_ID_LIST_SKIP_NO_ID_ADDR); } break; default: break; } } /**@brief Function for handling Service errors. * * @details A pointer to this function will be passed to each service which may need to inform the * application about an error. * * @param[in] nrf_error Error code containing information about what went wrong. */ static void service_error_handler(uint32_t nrf_error) { APP_ERROR_HANDLER(nrf_error); } /**@brief Function for handling advertising errors. * * @param[in] nrf_error Error code containing information about what went wrong. */ static void ble_advertising_error_handler(uint32_t nrf_error) { APP_ERROR_HANDLER(nrf_error); } /**@brief Function for performing a battery measurement, and update the Battery Level characteristic in the Battery Service. */ static void battery_level_update(void) { ret_code_t err_code; uint8_t battery_level; battery_level = (uint8_t)sensorsim_measure(&amp;m_battery_sim_state, &amp;m_battery_sim_cfg); err_code = ble_bas_battery_level_update(&amp;m_bas, battery_level, BLE_CONN_HANDLE_ALL); if ((err_code != NRF_SUCCESS) &amp;&amp; (err_code != NRF_ERROR_BUSY) &amp;&amp; (err_code != NRF_ERROR_RESOURCES) &amp;&amp; (err_code != NRF_ERROR_FORBIDDEN) &amp;&amp; (err_code != NRF_ERROR_INVALID_STATE) &amp;&amp; (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING) ) { APP_ERROR_HANDLER(err_code); } } /**@brief Function for handling the Battery measurement timer timeout. * * @details This function will be called each time the battery level measurement timer expires. * * @param[in] p_context Pointer used for passing some arbitrary information (context) from the * app_start_timer() call to the timeout handler. */ static void battery_level_meas_timeout_handler(void * p_context) { UNUSED_PARAMETER(p_context); battery_level_update(); } /**@brief Function for the GAP initialization. * * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the * device including the device name, appearance, and the preferred connection parameters. */ static void gap_params_init(void) { ret_code_t err_code; ble_gap_conn_params_t gap_conn_params; ble_gap_conn_sec_mode_t sec_mode; BLE_GAP_CONN_SEC_MODE_SET_OPEN(&amp;sec_mode); err_code = sd_ble_gap_device_name_set(&amp;sec_mode, (const uint8_t *)DEVICE_NAME, strlen(DEVICE_NAME)); APP_ERROR_CHECK(err_code); err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_HID_KEYBOARD); APP_ERROR_CHECK(err_code); memset(&amp;gap_conn_params, 0, sizeof(gap_conn_params)); gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL; gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL; gap_conn_params.slave_latency = SLAVE_LATENCY; gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT; err_code = sd_ble_gap_ppcp_set(&amp;gap_conn_params); APP_ERROR_CHECK(err_code); } /**@brief Function for initializing the GATT module. */ static void gatt_init(void) { ret_code_t err_code = nrf_ble_gatt_init(&amp;m_gatt, NULL); APP_ERROR_CHECK(err_code); } /**@brief Function for handling Queued Write Module errors. * * @details A pointer to this function will be passed to each service which may need to inform the * application about an error. * * @param[in] nrf_error Error code containing information about what went wrong. */ static void nrf_qwr_error_handler(uint32_t nrf_error) { APP_ERROR_HANDLER(nrf_error); } /**@brief Function for initializing the Queued Write Module. */ static void qwr_init(void) { ret_code_t err_code; nrf_ble_qwr_init_t qwr_init_obj = {0}; qwr_init_obj.error_handler = nrf_qwr_error_handler; #if HID_MULT ==0 err_code = nrf_ble_qwr_init(&amp;m_qwr, &amp;qwr_init_obj); APP_ERROR_CHECK(err_code); #else for (uint32_t i = 0; i &lt; NRF_SDH_BLE_TOTAL_LINK_COUNT; i++) { err_code = nrf_ble_qwr_init(&amp;m_qwr[i], &amp;qwr_init_obj); APP_ERROR_CHECK(err_code); } #endif } /**@brief Function for initializing Device Information Service. */ static void dis_init(void) { ret_code_t err_code; ble_dis_init_t dis_init_obj; ble_dis_pnp_id_t pnp_id; pnp_id.vendor_id_source = PNP_ID_VENDOR_ID_SOURCE; pnp_id.vendor_id = PNP_ID_VENDOR_ID; pnp_id.product_id = PNP_ID_PRODUCT_ID; pnp_id.product_version = PNP_ID_PRODUCT_VERSION; memset(&amp;dis_init_obj, 0, sizeof(dis_init_obj)); ble_srv_ascii_to_utf8(&amp;dis_init_obj.manufact_name_str, MANUFACTURER_NAME); dis_init_obj.p_pnp_id = &amp;pnp_id; dis_init_obj.dis_char_rd_sec = SEC_OPEN; err_code = ble_dis_init(&amp;dis_init_obj); APP_ERROR_CHECK(err_code); } /**@brief Function for initializing Battery Service. */ static void bas_init(void) { ret_code_t err_code; ble_bas_init_t bas_init_obj; memset(&amp;bas_init_obj, 0, sizeof(bas_init_obj)); bas_init_obj.evt_handler = NULL; bas_init_obj.support_notification = true; bas_init_obj.p_report_ref = NULL; bas_init_obj.initial_batt_level = 100; bas_init_obj.bl_rd_sec = SEC_OPEN; bas_init_obj.bl_cccd_wr_sec = SEC_OPEN; bas_init_obj.bl_report_rd_sec = SEC_OPEN; err_code = ble_bas_init(&amp;m_bas, &amp;bas_init_obj); APP_ERROR_CHECK(err_code); } /**@brief Function for initializing HID Service. */ static void hids_init(void) { ret_code_t err_code; ble_hids_init_t hids_init_obj; ble_hids_inp_rep_init_t * p_input_report; ble_hids_outp_rep_init_t * p_output_report; ble_hids_feature_rep_init_t * p_feature_report; uint8_t hid_info_flags; static ble_hids_inp_rep_init_t input_report_array[1]; static ble_hids_outp_rep_init_t output_report_array[1]; static ble_hids_feature_rep_init_t feature_report_array[1]; static uint8_t report_map_data[] = { 0x05, 0x01, // Usage Page (Generic Desktop) 0x09, 0x06, // Usage (Keyboard) 0xA1, 0x01, // Collection (Application) 0x05, 0x07, // Usage Page (Key Codes) 0x19, 0xe0, // Usage Minimum (224) 0x29, 0xe7, // Usage Maximum (231) 0x15, 0x00, // Logical Minimum (0) 0x25, 0x01, // Logical Maximum (1) 0x75, 0x01, // Report Size (1) 0x95, 0x08, // Report Count (8) 0x81, 0x02, // Input (Data, Variable, Absolute) 0x95, 0x01, // Report Count (1) 0x75, 0x08, // Report Size (8) 0x81, 0x01, // Input (Constant) reserved byte(1) 0x95, 0x05, // Report Count (5) 0x75, 0x01, // Report Size (1) 0x05, 0x08, // Usage Page (Page# for LEDs) 0x19, 0x01, // Usage Minimum (1) 0x29, 0x05, // Usage Maximum (5) 0x91, 0x02, // Output (Data, Variable, Absolute), Led report 0x95, 0x01, // Report Count (1) 0x75, 0x03, // Report Size (3) 0x91, 0x01, // Output (Data, Variable, Absolute), Led report padding 0x95, 0x06, // Report Count (6) 0x75, 0x08, // Report Size (8) 0x15, 0x00, // Logical Minimum (0) 0x25, 0x65, // Logical Maximum (101) 0x05, 0x07, // Usage Page (Key codes) 0x19, 0x00, // Usage Minimum (0) 0x29, 0x65, // Usage Maximum (101) 0x81, 0x00, // Input (Data, Array) Key array(6 bytes) 0x09, 0x05, // Usage (Vendor Defined) 0x15, 0x00, // Logical Minimum (0) 0x26, 0xFF, 0x00, // Logical Maximum (255) 0x75, 0x08, // Report Size (8 bit) 0x95, 0x02, // Report Count (2) 0xB1, 0x02, // Feature (Data, Variable, Absolute) 0xC0, // End Collection (Application) }; memset((void *)input_report_array, 0, sizeof(ble_hids_inp_rep_init_t)); memset((void *)output_report_array, 0, sizeof(ble_hids_outp_rep_init_t)); memset((void *)feature_report_array, 0, sizeof(ble_hids_feature_rep_init_t)); // Initialize HID Service p_input_report = &amp;input_report_array[INPUT_REPORT_KEYS_INDEX]; p_input_report-&gt;max_len = INPUT_REPORT_KEYS_MAX_LEN; p_input_report-&gt;rep_ref.report_id = INPUT_REP_REF_ID; p_input_report-&gt;rep_ref.report_type = BLE_HIDS_REP_TYPE_INPUT; p_input_report-&gt;sec.cccd_wr = SEC_OPEN; p_input_report-&gt;sec.wr = SEC_OPEN; p_input_report-&gt;sec.rd = SEC_OPEN; p_output_report = &amp;output_report_array[OUTPUT_REPORT_INDEX]; p_output_report-&gt;max_len = OUTPUT_REPORT_MAX_LEN; p_output_report-&gt;rep_ref.report_id = OUTPUT_REP_REF_ID; p_output_report-&gt;rep_ref.report_type = BLE_HIDS_REP_TYPE_OUTPUT; p_output_report-&gt;sec.wr = SEC_OPEN; p_output_report-&gt;sec.rd = SEC_OPEN; p_feature_report = &amp;feature_report_array[FEATURE_REPORT_INDEX]; p_feature_report-&gt;max_len = FEATURE_REPORT_MAX_LEN; p_feature_report-&gt;rep_ref.report_id = FEATURE_REP_REF_ID; p_feature_report-&gt;rep_ref.report_type = BLE_HIDS_REP_TYPE_FEATURE; p_feature_report-&gt;sec.rd = SEC_OPEN; p_feature_report-&gt;sec.wr = SEC_OPEN; hid_info_flags = HID_INFO_FLAG_REMOTE_WAKE_MSK | HID_INFO_FLAG_NORMALLY_CONNECTABLE_MSK; memset(&amp;hids_init_obj, 0, sizeof(hids_init_obj)); hids_init_obj.evt_handler = on_hids_evt; hids_init_obj.error_handler = service_error_handler; hids_init_obj.is_kb = true; hids_init_obj.is_mouse = false; hids_init_obj.inp_rep_count = 1; hids_init_obj.p_inp_rep_array = input_report_array; hids_init_obj.outp_rep_count = 1; hids_init_obj.p_outp_rep_array = output_report_array; hids_init_obj.feature_rep_count = 1; hids_init_obj.p_feature_rep_array = feature_report_array; hids_init_obj.rep_map.data_len = sizeof(report_map_data); hids_init_obj.rep_map.p_data = report_map_data; hids_init_obj.hid_information.bcd_hid = BASE_USB_HID_SPEC_VERSION; hids_init_obj.hid_information.b_country_code = 0; hids_init_obj.hid_information.flags = hid_info_flags; hids_init_obj.included_services_count = 0; hids_init_obj.p_included_services_array = NULL; hids_init_obj.rep_map.rd_sec = SEC_OPEN; hids_init_obj.hid_information.rd_sec = SEC_OPEN; hids_init_obj.boot_kb_inp_rep_sec.cccd_wr = SEC_OPEN; hids_init_obj.boot_kb_inp_rep_sec.rd = SEC_OPEN; hids_init_obj.boot_kb_outp_rep_sec.rd = SEC_OPEN; hids_init_obj.boot_kb_outp_rep_sec.wr = SEC_OPEN; hids_init_obj.protocol_mode_rd_sec = SEC_OPEN; hids_init_obj.protocol_mode_wr_sec = SEC_OPEN; hids_init_obj.ctrl_point_wr_sec = SEC_OPEN; err_code = ble_hids_init(&amp;m_hids, &amp;hids_init_obj); APP_ERROR_CHECK(err_code); } /**@brief Function for initializing services that will be used by the application. */ static void services_init(void) { qwr_init(); dis_init(); bas_init(); hids_init(); #if HID_MULT==1 ble_conn_state_init(); #endif } static void on_conn_params_evt(ble_conn_params_evt_t * p_evt) { uint32_t err_code; if (p_evt-&gt;evt_type == BLE_CONN_PARAMS_EVT_FAILED) { err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE); APP_ERROR_CHECK(err_code); } } /**@brief Function for initializing the battery sensor simulator. */ static void sensor_simulator_init(void) { m_battery_sim_cfg.min = MIN_BATTERY_LEVEL; m_battery_sim_cfg.max = MAX_BATTERY_LEVEL; m_battery_sim_cfg.incr = BATTERY_LEVEL_INCREMENT; m_battery_sim_cfg.start_at_max = true; sensorsim_init(&amp;m_battery_sim_state, &amp;m_battery_sim_cfg); } /**@brief Function for handling a Connection Parameters error. * * @param[in] nrf_error Error code containing information about what went wrong. */ static void conn_params_error_handler(uint32_t nrf_error) { APP_ERROR_HANDLER(nrf_error); } /**@brief Function for initializing the Connection Parameters module. */ static void conn_params_init(void) { ret_code_t err_code; ble_conn_params_init_t cp_init; memset(&amp;cp_init, 0, sizeof(cp_init)); cp_init.p_conn_params = NULL; cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY; cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY; cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT; cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID; #if HID_MULT==1 cp_init.disconnect_on_fail = true; cp_init.evt_handler = on_conn_params_evt; #else cp_init.disconnect_on_fail = false; cp_init.evt_handler = NULL; #endif cp_init.error_handler = conn_params_error_handler; err_code = ble_conn_params_init(&amp;cp_init); APP_ERROR_CHECK(err_code); } /**@brief Function for starting timers. */ static void timers_start(void) { ret_code_t err_code; err_code = app_timer_start(m_battery_timer_id, BATTERY_LEVEL_MEAS_INTERVAL, NULL); APP_ERROR_CHECK(err_code); } /**@brief Function for transmitting a key scan Press &amp; Release Notification. * * @warning This handler is an example only. You need to analyze how you wish to send the key * release. * * @param[in] p_instance Identifies the service for which Key Notifications are requested. * @param[in] p_key_pattern Pointer to key pattern. * @param[in] pattern_len Length of key pattern. 0 &lt; pattern_len &lt; 7. * @param[in] pattern_offset Offset applied to Key Pattern for transmission. * @param[out] actual_len Provides actual length of Key Pattern transmitted, making buffering of * rest possible if needed. * @return NRF_SUCCESS on success, NRF_ERROR_RESOURCES in case transmission could not be * completed due to lack of transmission buffer or other error codes indicating reason * for failure. */ static uint32_t send_key_scan_press_release(ble_hids_t * p_hids, uint8_t * p_key_pattern, uint16_t pattern_len, uint16_t pattern_offset, uint16_t * p_actual_len) { ret_code_t err_code; uint16_t offset; uint16_t data_len; uint8_t data[INPUT_REPORT_KEYS_MAX_LEN]; // HID Report Descriptor enumerates an array of size 6, the pattern hence shall not be any // longer than this. STATIC_ASSERT((INPUT_REPORT_KEYS_MAX_LEN - 2) == 6); ASSERT(pattern_len &lt;= (INPUT_REPORT_KEYS_MAX_LEN - 2)); offset = pattern_offset; data_len = pattern_len; do { // Reset the data buffer. memset(data, 0, sizeof(data)); // Copy the scan code. memcpy(data + SCAN_CODE_POS + offset, p_key_pattern + offset, data_len - offset); if (!m_in_boot_mode) { err_code = ble_hids_inp_rep_send(p_hids, INPUT_REPORT_KEYS_INDEX, INPUT_REPORT_KEYS_MAX_LEN, data, m_conn_handle); } else { err_code = ble_hids_boot_kb_inp_rep_send(p_hids, INPUT_REPORT_KEYS_MAX_LEN, data, m_conn_handle); } if (err_code != NRF_SUCCESS) { break; } offset++; } while (offset &lt;= data_len); *p_actual_len = offset; return err_code; } /**@brief Function for initializing the buffer queue used to key events that could not be * transmitted * * @warning This handler is an example only. You need to analyze how you wish to buffer or buffer at * all. * * @note In case of HID keyboard, a temporary buffering could be employed to handle scenarios * where encryption is not yet enabled or there was a momentary link loss or there were no * Transmit buffers. */ static void buffer_init(void) { uint32_t buffer_count; BUFFER_LIST_INIT(); for (buffer_count = 0; buffer_count &lt; MAX_BUFFER_ENTRIES; buffer_count++) { BUFFER_ELEMENT_INIT(buffer_count); } } /**@brief Function for enqueuing key scan patterns that could not be transmitted either completely * or partially. * * @warning This handler is an example only. You need to analyze how you wish to send the key * release. * * @param[in] p_hids Identifies the service for which Key Notifications are buffered. * @param[in] p_key_pattern Pointer to key pattern. * @param[in] pattern_len Length of key pattern. * @param[in] offset Offset applied to Key Pattern when requesting a transmission on * dequeue, @ref buffer_dequeue. * @return NRF_SUCCESS on success, else an error code indicating reason for failure. */ static uint32_t buffer_enqueue(ble_hids_t * p_hids, uint8_t * p_key_pattern, uint16_t pattern_len, uint16_t offset) { buffer_entry_t * element; uint32_t err_code = NRF_SUCCESS; if (BUFFER_LIST_FULL()) { // Element cannot be buffered. err_code = NRF_ERROR_NO_MEM; } else { // Make entry of buffer element and copy data. element = &amp;buffer_list.buffer[(buffer_list.wp)]; element-&gt;p_instance = p_hids; element-&gt;p_data = p_key_pattern; element-&gt;data_offset = offset; element-&gt;data_len = pattern_len; buffer_list.count++; buffer_list.wp++; if (buffer_list.wp == MAX_BUFFER_ENTRIES) { buffer_list.wp = 0; } } return err_code; } /**@brief Function to dequeue key scan patterns that could not be transmitted either completely of * partially. * * @warning This handler is an example only. You need to analyze how you wish to send the key * release. * * @param[in] tx_flag Indicative of whether the dequeue should result in transmission or not. * @note A typical example when all keys are dequeued with transmission is when link is * disconnected. * * @return NRF_SUCCESS on success, else an error code indicating reason for failure. */ static uint32_t buffer_dequeue(bool tx_flag) { buffer_entry_t * p_element; uint32_t err_code = NRF_SUCCESS; uint16_t actual_len; if (BUFFER_LIST_EMPTY()) { err_code = NRF_ERROR_NOT_FOUND; } else { bool remove_element = true; p_element = &amp;buffer_list.buffer[(buffer_list.rp)]; if (tx_flag) { err_code = send_key_scan_press_release(p_element-&gt;p_instance, p_element-&gt;p_data, p_element-&gt;data_len, p_element-&gt;data_offset, &amp;actual_len); // An additional notification is needed for release of all keys, therefore check // is for actual_len &lt;= element-&gt;data_len and not actual_len &lt; element-&gt;data_len if ((err_code == NRF_ERROR_RESOURCES) &amp;&amp; (actual_len &lt;= p_element-&gt;data_len)) { // Transmission could not be completed, do not remove the entry, adjust next data to // be transmitted p_element-&gt;data_offset = actual_len; remove_element = false; } } if (remove_element) { BUFFER_ELEMENT_INIT(buffer_list.rp); buffer_list.rp++; buffer_list.count--; if (buffer_list.rp == MAX_BUFFER_ENTRIES) { buffer_list.rp = 0; } } } return err_code; } /**@brief Function for sending sample key presses to the peer. * * @param[in] key_pattern_len Pattern length. * @param[in] p_key_pattern Pattern to be sent. */ static void keys_send(uint8_t key_pattern_len, uint8_t * p_key_pattern) { ret_code_t err_code; uint16_t actual_len; err_code = send_key_scan_press_release(&amp;m_hids, p_key_pattern, key_pattern_len, 0, &amp;actual_len); // An additional notification is needed for release of all keys, therefore check // is for actual_len &lt;= key_pattern_len and not actual_len &lt; key_pattern_len. if ((err_code == NRF_ERROR_RESOURCES) &amp;&amp; (actual_len &lt;= key_pattern_len)) { // Buffer enqueue routine return value is not intentionally checked. // Rationale: Its better to have a a few keys missing than have a system // reset. Recommendation is to work out most optimal value for // MAX_BUFFER_ENTRIES to minimize chances of buffer queue full condition UNUSED_VARIABLE(buffer_enqueue(&amp;m_hids, p_key_pattern, key_pattern_len, actual_len)); } if ((err_code != NRF_SUCCESS) &amp;&amp; (err_code != NRF_ERROR_INVALID_STATE) &amp;&amp; (err_code != NRF_ERROR_RESOURCES) &amp;&amp; (err_code != NRF_ERROR_BUSY) &amp;&amp; (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING) ) { APP_ERROR_HANDLER(err_code); } } /**@brief Function for handling the HID Report Characteristic Write event. * * @param[in] p_evt HID service event. */ static void on_hid_rep_char_write(ble_hids_evt_t * p_evt) { if (p_evt-&gt;params.char_write.char_id.rep_type == BLE_HIDS_REP_TYPE_OUTPUT) { ret_code_t err_code; uint8_t report_val; uint8_t report_index = p_evt-&gt;params.char_write.char_id.rep_index; if (report_index == OUTPUT_REPORT_INDEX) { // This code assumes that the output report is one byte long. Hence the following // static assert is made. STATIC_ASSERT(OUTPUT_REPORT_MAX_LEN == 1); err_code = ble_hids_outp_rep_get(&amp;m_hids, report_index, OUTPUT_REPORT_MAX_LEN, 0, m_conn_handle, &amp;report_val); APP_ERROR_CHECK(err_code); } } } /**@brief Function for putting the chip into sleep mode. * * @note This function will not return. */ static void sleep_mode_enter(void) { ret_code_t err_code; err_code = bsp_indication_set(BSP_INDICATE_IDLE); APP_ERROR_CHECK(err_code); // Prepare wakeup buttons. err_code = bsp_btn_ble_sleep_mode_prepare(); APP_ERROR_CHECK(err_code); // Go to system-off mode (this function will not return; wakeup will cause a reset). err_code = sd_power_system_off(); APP_ERROR_CHECK(err_code); } /**@brief Function for handling HID events. * * @details This function will be called for all HID events which are passed to the application. * * @param[in] p_hids HID service structure. * @param[in] p_evt Event received from the HID service. */ static void on_hids_evt(ble_hids_t * p_hids, ble_hids_evt_t * p_evt) { switch (p_evt-&gt;evt_type) { case BLE_HIDS_EVT_BOOT_MODE_ENTERED: m_in_boot_mode = true; break; case BLE_HIDS_EVT_REPORT_MODE_ENTERED: m_in_boot_mode = false; break; case BLE_HIDS_EVT_REP_CHAR_WRITE: on_hid_rep_char_write(p_evt); break; case BLE_HIDS_EVT_NOTIF_ENABLED: break; default: // No implementation needed. break; } } /**@brief Function for handling advertising events. * * @details This function will be called for advertising events which are passed to the application. * * @param[in] ble_adv_evt Advertising event. */ static void on_adv_evt(ble_adv_evt_t ble_adv_evt) { ret_code_t err_code; switch (ble_adv_evt) { case BLE_ADV_EVT_DIRECTED_HIGH_DUTY: NRF_LOG_INFO(&quot;High Duty Directed advertising.&quot;); err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING_DIRECTED); APP_ERROR_CHECK(err_code); break; case BLE_ADV_EVT_DIRECTED: NRF_LOG_INFO(&quot;Directed advertising.&quot;); err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING_DIRECTED); APP_ERROR_CHECK(err_code); break; case BLE_ADV_EVT_FAST: NRF_LOG_INFO(&quot;Fast advertising.&quot;); err_code = bsp_indication_set(BSP_INDICATE_IDLE); //err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING); APP_ERROR_CHECK(err_code); break; case BLE_ADV_EVT_SLOW: NRF_LOG_INFO(&quot;Slow advertising.&quot;); err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING_SLOW); APP_ERROR_CHECK(err_code); break; case BLE_ADV_EVT_FAST_WHITELIST: NRF_LOG_INFO(&quot;Fast advertising with whitelist.&quot;); err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING_WHITELIST); APP_ERROR_CHECK(err_code); break; case BLE_ADV_EVT_SLOW_WHITELIST: NRF_LOG_INFO(&quot;Slow advertising with whitelist.&quot;); err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING_WHITELIST); APP_ERROR_CHECK(err_code); break; case BLE_ADV_EVT_IDLE: err_code = bsp_indication_set(BSP_INDICATE_IDLE); APP_ERROR_CHECK(err_code); sleep_mode_enter(); break; case BLE_ADV_EVT_WHITELIST_REQUEST: { ble_gap_addr_t whitelist_addrs[BLE_GAP_WHITELIST_ADDR_MAX_COUNT]; ble_gap_irk_t whitelist_irks[BLE_GAP_WHITELIST_ADDR_MAX_COUNT]; uint32_t addr_cnt = BLE_GAP_WHITELIST_ADDR_MAX_COUNT; uint32_t irk_cnt = BLE_GAP_WHITELIST_ADDR_MAX_COUNT; err_code = pm_whitelist_get(whitelist_addrs, &amp;addr_cnt, whitelist_irks, &amp;irk_cnt); APP_ERROR_CHECK(err_code); NRF_LOG_DEBUG(&quot;pm_whitelist_get returns %d addr in whitelist and %d irk whitelist&quot;, addr_cnt, irk_cnt); // Set the correct identities list (no excluding peers with no Central Address Resolution). identities_set(PM_PEER_ID_LIST_SKIP_NO_IRK); // Apply the whitelist. err_code = ble_advertising_whitelist_reply(&amp;m_advertising, whitelist_addrs, addr_cnt, whitelist_irks, irk_cnt); APP_ERROR_CHECK(err_code); } break; //BLE_ADV_EVT_WHITELIST_REQUEST case BLE_ADV_EVT_PEER_ADDR_REQUEST: { pm_peer_data_bonding_t peer_bonding_data; // Only Give peer address if we have a handle to the bonded peer. if (m_peer_id != PM_PEER_ID_INVALID) { err_code = pm_peer_data_bonding_load(m_peer_id, &amp;peer_bonding_data); if (err_code != NRF_ERROR_NOT_FOUND) { APP_ERROR_CHECK(err_code); // Manipulate identities to exclude peers with no Central Address Resolution. identities_set(PM_PEER_ID_LIST_SKIP_ALL); ble_gap_addr_t * p_peer_addr = &amp;(peer_bonding_data.peer_ble_id.id_addr_info); err_code = ble_advertising_peer_addr_reply(&amp;m_advertising, p_peer_addr); APP_ERROR_CHECK(err_code); } } } break; //BLE_ADV_EVT_PEER_ADDR_REQUEST default: break; } } #if HID_MULT ==1 /**@brief Function for handling the Connected event. * * @param[in] p_gap_evt GAP event received from the BLE stack. */ static void on_connected(const ble_gap_evt_t * const p_gap_evt) { ret_code_t err_code; uint32_t periph_link_cnt = ble_conn_state_peripheral_conn_count(); // Number of peripheral links. NRF_LOG_INFO(&quot;Connection with link 0x%x established.&quot;, p_gap_evt-&gt;conn_handle); // Assign connection handle to available instance of QWR module. for (uint32_t i = 0; i &lt; NRF_SDH_BLE_PERIPHERAL_LINK_COUNT; i++) { if (m_qwr[i].conn_handle == BLE_CONN_HANDLE_INVALID) { err_code = nrf_ble_qwr_conn_handle_assign(&amp;m_qwr[i], p_gap_evt-&gt;conn_handle); APP_ERROR_CHECK(err_code); break; } } // Update LEDs bsp_board_led_on(LED_3); if (periph_link_cnt == NRF_SDH_BLE_PERIPHERAL_LINK_COUNT) { bsp_board_led_off(LED_4); } else { // Continue advertising. More connections can be established because the maximum link count has not been reached. advertising_start(true); } } /**@brief Function for handling the Disconnected event. * * @param[in] p_gap_evt GAP event received from the BLE stack. */ static void on_disconnected(ble_gap_evt_t const * const p_gap_evt) { ret_code_t err_code; uint32_t periph_link_cnt = ble_conn_state_peripheral_conn_count(); // Number of peripheral links. NRF_LOG_INFO(&quot;Connection 0x%x has been disconnected. Reason: 0x%X&quot;, p_gap_evt-&gt;conn_handle, p_gap_evt-&gt;params.disconnected.reason); if (periph_link_cnt == 0) { advertising_start(true); bsp_board_led_off(LED_3); APP_ERROR_CHECK(err_code); } if (periph_link_cnt == (NRF_SDH_BLE_PERIPHERAL_LINK_COUNT - 1)) { // Advertising is not running when all connections are taken, and must therefore be started. advertising_start(true); } } #endif /**@brief Function for handling BLE events. * * @param[in] p_ble_evt Bluetooth stack event. * @param[in] p_context Unused. */ static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context) { ret_code_t err_code; switch (p_ble_evt-&gt;header.evt_id) { case BLE_GAP_EVT_CONNECTED: NRF_LOG_INFO(&quot;Connected&quot;); #if HID_MULT ==0 err_code = bsp_indication_set(BSP_INDICATE_CONNECTED); APP_ERROR_CHECK(err_code); m_conn_handle = p_ble_evt-&gt;evt.gap_evt.conn_handle; err_code = nrf_ble_qwr_conn_handle_assign(&amp;m_qwr, m_conn_handle); APP_ERROR_CHECK(err_code); #else on_connected(&amp;p_ble_evt-&gt;evt.gap_evt); #endif break; case BLE_GAP_EVT_DISCONNECTED: NRF_LOG_INFO(&quot;Disconnected&quot;); // Dequeue all keys without transmission. (void) buffer_dequeue(false); #if HID_MULT ==0 m_conn_handle = BLE_CONN_HANDLE_INVALID; err_code = bsp_indication_set(BSP_INDICATE_ALERT_OFF); APP_ERROR_CHECK(err_code); #else on_disconnected(&amp;p_ble_evt-&gt;evt.gap_evt); #endif delete_bonds(); break; // BLE_GAP_EVT_DISCONNECTED case BLE_GAP_EVT_PHY_UPDATE_REQUEST: { NRF_LOG_DEBUG(&quot;PHY update request.&quot;); ble_gap_phys_t const phys = { .rx_phys = BLE_GAP_PHY_AUTO, .tx_phys = BLE_GAP_PHY_AUTO, }; err_code = sd_ble_gap_phy_update(p_ble_evt-&gt;evt.gap_evt.conn_handle, &amp;phys); APP_ERROR_CHECK(err_code); } break; case BLE_GATTS_EVT_HVN_TX_COMPLETE: // Send next key event (void) buffer_dequeue(true); break; case BLE_GATTC_EVT_TIMEOUT: // Disconnect on GATT Client timeout event. NRF_LOG_DEBUG(&quot;GATT Client Timeout.&quot;); err_code = sd_ble_gap_disconnect(p_ble_evt-&gt;evt.gattc_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION); APP_ERROR_CHECK(err_code); break; case BLE_GATTS_EVT_TIMEOUT: // Disconnect on GATT Server timeout event. NRF_LOG_DEBUG(&quot;GATT Server Timeout.&quot;); err_code = sd_ble_gap_disconnect(p_ble_evt-&gt;evt.gatts_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION); APP_ERROR_CHECK(err_code); break; default: // No implementation needed. break; } } /**@brief Function for initializing the BLE stack. * * @details Initializes the SoftDevice and the BLE event interrupt. */ static void ble_stack_init(void) { ret_code_t err_code; err_code = nrf_sdh_enable_request(); APP_ERROR_CHECK(err_code); // Configure the BLE stack using the default settings. // Fetch the start address of the application RAM. uint32_t ram_start = 0; err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &amp;ram_start); APP_ERROR_CHECK(err_code); // Enable BLE stack. err_code = nrf_sdh_ble_enable(&amp;ram_start); APP_ERROR_CHECK(err_code); // Register a handler for BLE events. NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL); } /**@brief Function for the Event Scheduler initialization. */ static void scheduler_init(void) { APP_SCHED_INIT(SCHED_MAX_EVENT_DATA_SIZE, SCHED_QUEUE_SIZE); } //////////////////////////////////////////////////////////////////////////////////////////// /**@brief Function for handling events from the BSP module. * * @param[in] event Event generated by button press. */ static void bsp_event_handler(bsp_event_t event) { uint32_t err_code; static uint8_t * p_key = 0; static uint8_t size = 0; switch (event) { case BSP_EVENT_SLEEP: sleep_mode_enter(); break; case BSP_EVENT_DISCONNECT: err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION); if (err_code != NRF_ERROR_INVALID_STATE) { APP_ERROR_CHECK(err_code); } break; case BSP_EVENT_WHITELIST_OFF: if (m_conn_handle == BLE_CONN_HANDLE_INVALID) { err_code = ble_advertising_restart_without_whitelist(&amp;m_advertising); if (err_code != NRF_ERROR_INVALID_STATE) { APP_ERROR_CHECK(err_code); } } break; case BSP_EVENT_KEY_0: break; default: break; } } /**@brief Function for the Peer Manager initialization. */ static void peer_manager_init(void) { ble_gap_sec_params_t sec_param; ret_code_t err_code; err_code = pm_init(); APP_ERROR_CHECK(err_code); memset(&amp;sec_param, 0, sizeof(ble_gap_sec_params_t)); // Security parameters to be used for all security procedures. sec_param.bond = SEC_PARAM_BOND; sec_param.mitm = SEC_PARAM_MITM; sec_param.lesc = SEC_PARAM_LESC; sec_param.keypress = SEC_PARAM_KEYPRESS; sec_param.io_caps = SEC_PARAM_IO_CAPABILITIES; sec_param.oob = SEC_PARAM_OOB; sec_param.min_key_size = SEC_PARAM_MIN_KEY_SIZE; sec_param.max_key_size = SEC_PARAM_MAX_KEY_SIZE; sec_param.kdist_own.enc = 1; sec_param.kdist_own.id = 1; sec_param.kdist_peer.enc = 1; sec_param.kdist_peer.id = 1; err_code = pm_sec_params_set(&amp;sec_param); APP_ERROR_CHECK(err_code); err_code = pm_register(pm_evt_handler); APP_ERROR_CHECK(err_code); } /**@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(&amp;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 = false; init.config.ble_adv_directed_high_duty_enabled = false; 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.evt_handler = on_adv_evt; init.error_handler = ble_advertising_error_handler; err_code = ble_advertising_init(&amp;m_advertising, &amp;init); APP_ERROR_CHECK(err_code); ble_advertising_conn_cfg_tag_set(&amp;m_advertising, APP_BLE_CONN_CFG_TAG); } /**@brief Function for initializing buttons and leds. * * @param[out] p_erase_bonds Will be true if the clear bonding button was pressed to wake the application up. */ static void buttons_leds_init(bool * p_erase_bonds) { ret_code_t err_code; bsp_event_t startup_event; err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler); APP_ERROR_CHECK(err_code); err_code = bsp_btn_ble_init(NULL, &amp;startup_event); APP_ERROR_CHECK(err_code); *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA); } /**@brief Function for the Timer initialization. * * @details Initializes the timer module. */ static void timers_init(void) { ret_code_t err_code; err_code = app_timer_init(); APP_ERROR_CHECK(err_code); // Create battery timer. err_code = app_timer_create(&amp;m_battery_timer_id, APP_TIMER_MODE_REPEATED, battery_level_meas_timeout_handler); APP_ERROR_CHECK(err_code); } /**@brief Function for initializing the nrf log module. */ static void log_init(void) { ret_code_t err_code = NRF_LOG_INIT(NULL); APP_ERROR_CHECK(err_code); NRF_LOG_DEFAULT_BACKENDS_INIT(); } /**@brief Function for initializing power management. */ static void power_management_init(void) { ret_code_t err_code; err_code = nrf_pwr_mgmt_init(); APP_ERROR_CHECK(err_code); } /**@brief Function for handling the idle state (main loop). * * @details If there is no pending log operation, then sleep until next the next event occurs. */ static void idle_state_handle(void) { app_sched_execute(); if (NRF_LOG_PROCESS() == false) { nrf_pwr_mgmt_run(); } } /**@brief Function for application main entry. */ int main(void) { ret_code_t err_code; bool erase_bonds; // Initialize. log_init(); timers_init(); buttons_leds_init(&amp;erase_bonds); power_management_init(); ble_stack_init(); scheduler_init(); gap_params_init(); gatt_init(); advertising_init(); services_init(); sensor_simulator_init(); conn_params_init(); buffer_init(); peer_manager_init(); // Start execution. NRF_LOG_INFO(&quot;HID MULTIPLE started.&quot;); timers_start(); advertising_start(erase_bonds); // Enter main loop. for (;;) { idle_state_handle(); } } /** * @} */ </pre></p> <p>Though it could connect with 2 host by nRF connect it could not support windows HID service.</p> <p>Whenever it connect with PC, it just dropped then reconnect and dropped again.</p> <p><pre class="ui-code" data-mode="text">00&gt; &lt;info&gt; app: HID MULTIPLE started. 00&gt; &lt;info&gt; app: m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8 00&gt; &lt;info&gt; app: Fast advertising. 00&gt; &lt;info&gt; app: Connected 00&gt; &lt;info&gt; app: Connection with link 0x0 established. 00&gt; &lt;info&gt; app: Erase bonds! 00&gt; &lt;info&gt; peer_manager_handler: All peers deleted. 00&gt; &lt;info&gt; app: m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8 00&gt; &lt;info&gt; app: Fast advertising. 00&gt; &lt;info&gt; peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Encryption, error: 4102 00&gt; &lt;error&gt; app: Fatal error 00&gt; &lt;warning&gt; app: System reset 00&gt; &lt;info&gt; app: HID MULTIPLE started. 00&gt; &lt;info&gt; app: m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8 00&gt; &lt;info&gt; app: Fast advertising. 00&gt; &lt;info&gt; app: Connected 00&gt; &lt;info&gt; app: Connection with link 0x0 established. 00&gt; &lt;info&gt; app: Erase bonds! 00&gt; &lt;info&gt; peer_manager_handler: All peers deleted. 00&gt; &lt;info&gt; app: m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8 00&gt; &lt;info&gt; app: Fast advertising. 00&gt; &lt;error&gt; app: Fatal error 00&gt; &lt;warning&gt; app: System reset</pre></p> <p>Besides, when the device is connected with 2 host once the device disconnect with on of them. It will disconnect for all.</p> <p></p> <p>May I know how could I modified it?&nbsp;</p> <p>When I program the code, I found that start_advertising are different.&nbsp;</p> <p>Keyboard used the bond information&nbsp; but multi-peripheral doesn&#39;t.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/237343?ContentTypeID=1Mon, 02 Mar 2020 09:14:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f95c1f35-74aa-4678-a719-0a7e8893a436Sigurd[quote user="Wedy"]Thus, I would like to know if I remove the function will it cause any effect to the HID service?[/quote] <p>&nbsp;You should keep the Peer Manager if you are&nbsp;developing a HID keyboard.</p> [quote user="Wedy"]Could you give me some guide, which parts are necessary to add in the keyboard sample to support multi-peripheral sample?[/quote] <p>I don&#39;t have a guide for this, but start by setting&nbsp;NRF_SDH_BLE_PERIPHERAL_LINK_COUNT and&nbsp;NRF_SDH_BLE_TOTAL_LINK_COUNT in sdk_config.h to 2. You should then replace:</p> <p><pre class="ui-code" data-mode="text">NRF_BLE_QWR_DEF(m_qwr); /**&lt; Context for the Queued Write module.*/</pre></p> <p>with</p> <p><pre class="ui-code" data-mode="text">NRF_BLE_QWRS_DEF(m_qwr, NRF_SDH_BLE_TOTAL_LINK_COUNT); /**&lt; Context for the Queued Write module.*/</pre></p> <p>&nbsp;in&nbsp;qwr_init(), replace</p> <p><pre class="ui-code" data-mode="text">err_code = nrf_ble_qwr_init(&amp;m_qwr, &amp;qwr_init_obj);</pre></p> <p>with</p> <p><pre class="ui-code" data-mode="text"> for (uint32_t i = 0; i &lt; NRF_SDH_BLE_TOTAL_LINK_COUNT; i++) { err_code = nrf_ble_qwr_init(&amp;m_qwr[i], &amp;qwr_init_obj); APP_ERROR_CHECK(err_code); }</pre></p> <p>Add the&nbsp;ble_conn_state Connection state module, and call&nbsp;</p> <div> <div><span>ble_conn_state_init</span><span>(); in your service init code.</span></div> <div><span></span></div> <div><span><span>Add the&nbsp;</span></span>on_connected() and&nbsp;on_disconnected() functions found in&nbsp;&nbsp;ble_app_multiperipheral to your keyboard project.</div> <div></div> <div>[quote user="Wedy"]For instance, run HID service with host A and run HRS service with host B at the same time?[/quote]</div> <div>Yes, it&#39;s possible. But note that the service attribute table is shared, so a master/central has potentially access to both services.<br /><span></span></div> </div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/236675?ContentTypeID=1Thu, 27 Feb 2020 03:26:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c01d85ca-ecc4-47ac-b71e-bf512f6acfefCY<p>Is it possible to&nbsp;proceed the different service for each host?&nbsp;</p> <p>For instance, run HID service with host A and run HRS service with host B at the same time?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/235925?ContentTypeID=1Mon, 24 Feb 2020 10:41:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:47754844-5444-497d-bd9b-064d1264e119CY<p>Hi Sigurd,</p> <p></p> <p>I have viewed the sample and found that it doesn&#39;t use peer manager.</p> <p>However, the peer manager, whitelist and bond are used in keyboard sample.</p> <p>Thus, I would like to know if I remove the function will it cause any effect to the HID service?</p> <p>Besides&nbsp;that, I also found out the structure of advertising_init (on_adv_evt) and advertising_start is different from keyboard and multi-peripheral sample.</p> <p>Could you give me some guide, which parts are necessary to add in the keyboard sample to support multi-peripheral sample?</p> <p>Thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/235877?ContentTypeID=1Mon, 24 Feb 2020 08:48:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ecbf1c8-05f2-44f7-94c1-5586b64e4786Sigurd[quote user="Wedy"]May I know could it support connectable advertisement?[/quote] <p>&nbsp;Yes, that is supported. You can have <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsds_s132%2FSDS%2Fs1xx%2Fs130.html">20 concurrent connections</a>.</p> [quote user="Wedy"]So the next question is &quot;Is it possible to connect with 2 centrals at the same time?&quot;[/quote] <p>Yes, you do connectable advertising and device #1 connects. After device #1 connects, you start connectable advertising again, and device #2 connects.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/235848?ContentTypeID=1Mon, 24 Feb 2020 01:34:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:49891c2e-a202-4abc-a97f-380fd640bff6CY<p>Hi Sigurd,&nbsp;</p> <p>May I know could it support connectable advertisement? I know it might interrupt the connection with first central.</p> <p>So the next question is &quot;Is it possible to connect with 2 centrals at the same time?&quot;</p> <p>(The development is based on SDK15.2)</p> <p>Thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/235701?ContentTypeID=1Fri, 21 Feb 2020 12:17:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f7c01386-52d5-4307-be02-e45e21c28acaSigurd<p>Take a look at the <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/ble_sdk_app_multiperipheral.html">ble_app_multiperipheral example</a><span>. It will continue to advertise also after connecting to the first central.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/235658?ContentTypeID=1Fri, 21 Feb 2020 09:08:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2e9b8a4d-b7ef-453d-9df4-019633c3fecfCY<p>Hi Jimmy,</p> <p>Thanks for the reply. But it seem a little be different from my requirement.</p> <p>Based on your program, it seems that it is still need to interrupt the host A then start advertising again to connect with host B. It is pretty much like the multiperipheral_keyboard does.</p> <p>However, the mechanism I would like to achieve is&nbsp;keep the advertise function during the device is still connecting with the host A.</p> <p>You can imaging that it is a keyboard with beacon service.</p> <p>Thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/235607?ContentTypeID=1Fri, 21 Feb 2020 06:41:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:57b8bb03-6aad-4941-8bb1-19306e1ef943Jimmy Wong<p>HI,<br /><br />I did the example (<a href="https://github.com/jimmywong2003/nrf5-bond-with-2nd-central-example">https://github.com/jimmywong2003/nrf5-bond-with-2nd-central-example</a>).<br /><br />You can find the details in the readme (LINK).</p> <p>It uses 2 peripheral roles on the device.</p><div style="clear:both;"></div>