Toggle virtual keyboard with Bluetooth HID in iOS

Question

Hi, 
 I am using ble_sdk_app_hids_keyboard example: 
 https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Fble_sdk_app_hids_keyboard.html 
 and try to send toggle keyboard key to iOS without success. 
 the "Hello" example is working fine. and sending other characters like backspace/home button/ and etc. is worked fine except toggling key. 
 
 this is the report map: 
 
 static void hids_init(void) { static uint8_t report_map_data[] = { 0x05, 0x01, // Usage Page (Generic Desktop) 0x09, 0x06, // Usage (Keyboard) 0xA1, 0x01, // Collection (Application) 0x85, 0x01, // Report Id (1) 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 Count (2) 0x95, 0x02, // Report Size (8 bit) 0xB1, 0x02, // Feature (Data, Variable, Absolute) 
 0xC0, // End Collection (Application) // Report ID 2: Advanced buttons 0x05, 0x0C, // Usage Page (Consumer) 0x09, 0x01, // Usage (Consumer Control) 0xA1, 0x01, // Collection (Application) 0x85, 0x02, // Report Id (2) 0x15, 0x00, // Logical minimum (0) 0x25, 0x01, // Logical maximum (1) 0x75, 0x01, // Report Size (1) 0x95, 0x01, // Report Count (1) 
 0x0A, 0xAE, 0x01, // Usage (AL Keyboard Layout) 0x81, 0x06, // Input (Data,Value,Relative,Bit Field) 0xC0 // End Collection 
 }; 
 
 and this is the code that sends the toggling: 
 uint8_t keyboard_toggle = 0x65; 
 // 1 designates the report index, not report ID. ble_hids_inp_rep_send(&m_hids, 0, sizeof(keyboard_toggle), &keyboard_toggle, m_conn_handle); 
 
 what am I missing? 
 any help will be welcome. 
 I am using nrf52840-dk. 
 
 Thanks, 
 Yair

Yair.P · Accepted Answer

I succeeded to toggle keyboard on iphone. 
 this is the fixed code: 
 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[2]; 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) 0x85, 0x00, // Report Id (0) 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 Count (2) 0x95, 0x02, // Report Size (8 bit) 0xB1, 0x02, // Feature (Data, Variable, Absolute) 
 0xC0, // End Collection (Application) // Report ID 2: Advanced buttons 0x05, 0x0C, // Usage Page (Consumer) 0x09, 0x01, // Usage (Consumer Control) 0xA1, 0x01, // Collection (Application) 0x85, 0x01, // Report Id (1) 0x15, 0x00, // Logical minimum (0) 0x25, 0x01, // Logical maximum (1) 0x75, 0x01, // Report Size (1) 0x95, 0x01, // Report Count (1) 
 0x0A, 0xAE, 0x01, // Usage (AL Keyboard Layout) 0x81, 0x06, // Input (Data,Value,Relative,Bit Field) 0xC0 // End Collection }; 
 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 = &input_report_array[INPUT_REPORT_KEYS_INDEX]; p_input_report->max_len = INPUT_REPORT_KEYS_MAX_LEN; p_input_report->rep_ref.report_id = INPUT_REP_REF_ID; p_input_report->rep_ref.report_type = BLE_HIDS_REP_TYPE_INPUT; 
 p_input_report->sec.cccd_wr = SEC_JUST_WORKS; p_input_report->sec.wr = SEC_JUST_WORKS; p_input_report->sec.rd = SEC_JUST_WORKS; 
 // Initialize HID Service p_input_report = &input_report_array[1]; p_input_report->max_len = INPUT_REPORT_KEYS_MAX_LEN; p_input_report->rep_ref.report_id = 1; p_input_report->rep_ref.report_type = BLE_HIDS_REP_TYPE_INPUT; 
 p_input_report->sec.cccd_wr = SEC_JUST_WORKS; p_input_report->sec.wr = SEC_JUST_WORKS; p_input_report->sec.rd = SEC_JUST_WORKS; p_input_report = &input_report_array[INPUT_REPORT_KEYS_INDEX]; 
 p_output_report = &output_report_array[OUTPUT_REPORT_INDEX]; p_output_report->max_len = OUTPUT_REPORT_MAX_LEN; p_output_report->rep_ref.report_id = OUTPUT_REP_REF_ID; p_output_report->rep_ref.report_type = BLE_HIDS_REP_TYPE_OUTPUT; 
 p_output_report->sec.wr = SEC_JUST_WORKS; p_output_report->sec.rd = SEC_JUST_WORKS; 
 p_feature_report = &feature_report_array[FEATURE_REPORT_INDEX]; p_feature_report->max_len = FEATURE_REPORT_MAX_LEN; p_feature_report->rep_ref.report_id = FEATURE_REP_REF_ID; p_feature_report->rep_ref.report_type = BLE_HIDS_REP_TYPE_FEATURE; 
 p_feature_report->sec.rd = SEC_JUST_WORKS; p_feature_report->sec.wr = SEC_JUST_WORKS; 
 hid_info_flags = HID_INFO_FLAG_REMOTE_WAKE_MSK | HID_INFO_FLAG_NORMALLY_CONNECTABLE_MSK; 
 memset(&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 = 2; 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_JUST_WORKS; hids_init_obj.hid_information.rd_sec = SEC_JUST_WORKS; 
 hids_init_obj.boot_kb_inp_rep_sec.cccd_wr = SEC_JUST_WORKS; hids_init_obj.boot_kb_inp_rep_sec.rd = SEC_JUST_WORKS; 
 hids_init_obj.boot_kb_outp_rep_sec.rd = SEC_JUST_WORKS; hids_init_obj.boot_kb_outp_rep_sec.wr = SEC_JUST_WORKS; 
 hids_init_obj.protocol_mode_rd_sec = SEC_JUST_WORKS; hids_init_obj.protocol_mode_wr_sec = SEC_JUST_WORKS; hids_init_obj.ctrl_point_wr_sec = SEC_JUST_WORKS; 
 err_code = ble_hids_init(&m_hids, &hids_init_obj); APP_ERROR_CHECK(err_code); } 
 
 and for toggle: 
 { 
 uint32_t err_code; 
 static uint8_t keyboard_toggle[] = {1}; //static uint8_t keyboard_toggle[] = {0x01}; //// 1 designates the report index, not report ID. err_code = ble_hids_inp_rep_send(&m_hids, 1, sizeof(keyboard_toggle), keyboard_toggle, m_conn_handle); APP_ERROR_CHECK(err_code); uint8_t release[] = {0}; ble_hids_inp_rep_send(&m_hids, 1, sizeof(release), release, m_conn_handle); APP_ERROR_CHECK(err_code); 
 }

Toggle virtual keyboard with Bluetooth HID in iOS

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