1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define __BTSTACK_FILE__ "sm_pairing_central.c" 39 40 41 // ***************************************************************************** 42 /* EXAMPLE_START(sm_pairing_central): LE Peripheral - Test pairing combinations 43 * 44 * @text Depending on the Authentication requiremens and IO Capabilities, 45 * the pairing process uses different short and long term key generation method. 46 * This example helps explore the different options incl. LE Secure Connections. 47 * It scans for advertisements and connects to the first device that lists a 48 * random service. 49 */ 50 // ***************************************************************************** 51 52 53 #include <stdint.h> 54 #include <inttypes.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 59 #include "btstack.h" 60 61 62 // We're looking for a remote device that lists this service in the advertisement 63 // LightBlue assigns 0x1111 as the UUID for a Blank service. 64 #define REMOTE_SERVICE 0x1111 65 66 67 static btstack_packet_callback_registration_t hci_event_callback_registration; 68 static btstack_packet_callback_registration_t sm_event_callback_registration; 69 70 /* @section GAP LE setup for receiving advertisements 71 * 72 * @text GAP LE advertisements are received as custom HCI events of the 73 * GAP_EVENT_ADVERTISING_REPORT type. To receive them, you'll need to register 74 * the HCI packet handler, as shown in Listing GAPLEAdvSetup. 75 */ 76 77 /* LISTING_START(GAPLEAdvSetup): Setting up GAP LE client for receiving advertisements */ 78 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 79 80 static void sm_pairing_central_setup(void){ 81 hci_event_callback_registration.callback = &packet_handler; 82 hci_add_event_handler(&hci_event_callback_registration); 83 84 l2cap_init(); 85 86 // setup le device db 87 le_device_db_init(); 88 89 // setup SM: Display only 90 sm_init(); 91 sm_event_callback_registration.callback = &packet_handler; 92 sm_add_event_handler(&sm_event_callback_registration); 93 94 /** 95 * Choose ONE of the following configurations 96 */ 97 98 // LE Legacy Pairing, Just Works 99 sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 100 sm_set_authentication_requirements(0); 101 102 // LE Legacy Pairing, Passkey entry initiator enter, responder (us) displays 103 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY); 104 // sm_set_authentication_requirements(SM_AUTHREQ_MITM_PROTECTION); 105 106 #ifdef ENABLE_LE_SECURE_CONNECTIONS 107 // LE Secure Connetions, Just Works 108 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 109 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION); 110 111 // LE Secure Connections, Numeric Comparison 112 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 113 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION|SM_AUTHREQ_MITM_PROTECTION); 114 115 // LE Legacy Pairing, Passkey entry initiator enter, responder (us) displays 116 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY); 117 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION|SM_AUTHREQ_MITM_PROTECTION); 118 #endif 119 } 120 121 /* LISTING_END */ 122 123 /* @section HCI packet handler 124 * 125 * @text The HCI packet handler has to start the scanning, 126 * and to handle received advertisements. Advertisements are received 127 * as HCI event packets of the GAP_EVENT_ADVERTISING_REPORT type, 128 * see Listing GAPLEAdvPacketHandler. 129 */ 130 131 /* LISTING_START(GAPLEAdvPacketHandler): Scanning and receiving advertisements */ 132 133 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 134 UNUSED(channel); 135 UNUSED(size); 136 137 if (packet_type != HCI_EVENT_PACKET) return; 138 hci_con_handle_t con_handle; 139 140 switch (hci_event_packet_get_type(packet)) { 141 case BTSTACK_EVENT_STATE: 142 // BTstack activated, get started 143 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 144 printf("Start scaning!\n"); 145 gap_set_scan_parameters(1,0x0030, 0x0030); 146 gap_start_scan(); 147 } 148 break; 149 case GAP_EVENT_ADVERTISING_REPORT:{ 150 bd_addr_t address; 151 gap_event_advertising_report_get_address(packet, address); 152 uint8_t address_type = gap_event_advertising_report_get_address_type(packet); 153 uint8_t length = gap_event_advertising_report_get_data_length(packet); 154 const uint8_t * data = gap_event_advertising_report_get_data(packet); 155 printf("Advertisement event: addr-type %u, addr %s, data[%u] ", 156 address_type, bd_addr_to_str(address), length); 157 printf_hexdump(data, length); 158 if (!ad_data_contains_uuid16(length, (uint8_t *) data, REMOTE_SERVICE)) break; 159 printf("Found remote with UUID %04x, connecting...\n", REMOTE_SERVICE); 160 gap_stop_scan(); 161 gap_connect(address,address_type); 162 break; 163 } 164 case SM_EVENT_JUST_WORKS_REQUEST: 165 printf("Just works requested\n"); 166 sm_just_works_confirm(sm_event_just_works_request_get_handle(packet)); 167 break; 168 case SM_EVENT_NUMERIC_COMPARISON_REQUEST: 169 printf("Confirming numeric comparison: %"PRIu32"\n", sm_event_numeric_comparison_request_get_passkey(packet)); 170 sm_numeric_comparison_confirm(sm_event_passkey_display_number_get_handle(packet)); 171 break; 172 case SM_EVENT_PASSKEY_DISPLAY_NUMBER: 173 printf("Display Passkey: %"PRIu32"\n", sm_event_passkey_display_number_get_passkey(packet)); 174 break; 175 176 case HCI_EVENT_LE_META: 177 // wait for connection complete 178 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 179 con_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 180 // start pairing 181 sm_request_pairing(con_handle); 182 break; 183 default: 184 break; 185 } 186 } 187 /* LISTING_END */ 188 189 int btstack_main(void); 190 int btstack_main(void) 191 { 192 sm_pairing_central_setup(); 193 194 // turn on! 195 hci_power_control(HCI_POWER_ON); 196 197 return 0; 198 } 199 200 /* EXAMPLE_END */ 201