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 #include "sm_pairing_central.h" 61 62 63 // We're looking for a remote device that lists this service in the advertisement 64 // LightBlue assigns 0x1111 as the UUID for a Blank service. 65 #define REMOTE_SERVICE 0x1111 66 67 68 static btstack_packet_callback_registration_t hci_event_callback_registration; 69 static btstack_packet_callback_registration_t sm_event_callback_registration; 70 71 /* @section GAP LE setup for receiving advertisements 72 * 73 * @text GAP LE advertisements are received as custom HCI events of the 74 * GAP_EVENT_ADVERTISING_REPORT type. To receive them, you'll need to register 75 * the HCI packet handler, as shown in Listing GAPLEAdvSetup. 76 */ 77 78 /* LISTING_START(GAPLEAdvSetup): Setting up GAP LE client for receiving advertisements */ 79 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 80 81 static void sm_pairing_central_setup(void){ 82 l2cap_init(); 83 84 // setup le device db 85 le_device_db_init(); 86 87 // setup SM: Display only 88 sm_init(); 89 90 // setup ATT server 91 att_server_init(profile_data, NULL, NULL); 92 93 /** 94 * Choose ONE of the following configurations 95 */ 96 97 // register handler 98 hci_event_callback_registration.callback = &packet_handler; 99 hci_add_event_handler(&hci_event_callback_registration); 100 101 sm_event_callback_registration.callback = &packet_handler; 102 sm_add_event_handler(&sm_event_callback_registration); 103 104 att_server_register_packet_handler(packet_handler); 105 106 // LE Legacy Pairing, Just Works 107 sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 108 sm_set_authentication_requirements(SM_AUTHREQ_NO_BONDING); 109 110 // LE Legacy Pairing, Passkey entry initiator enter, responder (us) displays 111 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY); 112 // sm_set_authentication_requirements(SM_AUTHREQ_MITM_PROTECTION); 113 // sm_use_fixed_passkey_in_display_role(123456); 114 115 #ifdef ENABLE_LE_SECURE_CONNECTIONS 116 // LE Secure Connetions, Just Works 117 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 118 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION); 119 120 // LE Secure Connections, Numeric Comparison 121 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 122 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION|SM_AUTHREQ_MITM_PROTECTION); 123 124 // LE Legacy Pairing, Passkey entry initiator enter, responder (us) displays 125 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY); 126 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION|SM_AUTHREQ_MITM_PROTECTION); 127 // sm_use_fixed_passkey_in_display_role(123456); 128 #endif 129 } 130 131 /* LISTING_END */ 132 133 /* @section HCI packet handler 134 * 135 * @text The HCI packet handler has to start the scanning, 136 * and to handle received advertisements. Advertisements are received 137 * as HCI event packets of the GAP_EVENT_ADVERTISING_REPORT type, 138 * see Listing GAPLEAdvPacketHandler. 139 */ 140 141 /* LISTING_START(GAPLEAdvPacketHandler): Scanning and receiving advertisements */ 142 143 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 144 UNUSED(channel); 145 UNUSED(size); 146 147 if (packet_type != HCI_EVENT_PACKET) return; 148 hci_con_handle_t con_handle; 149 150 switch (hci_event_packet_get_type(packet)) { 151 case BTSTACK_EVENT_STATE: 152 // BTstack activated, get started 153 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 154 printf("Start scaning!\n"); 155 gap_set_scan_parameters(1,0x0030, 0x0030); 156 gap_start_scan(); 157 } 158 break; 159 case GAP_EVENT_ADVERTISING_REPORT:{ 160 bd_addr_t address; 161 gap_event_advertising_report_get_address(packet, address); 162 uint8_t address_type = gap_event_advertising_report_get_address_type(packet); 163 uint8_t length = gap_event_advertising_report_get_data_length(packet); 164 const uint8_t * data = gap_event_advertising_report_get_data(packet); 165 printf("Advertisement event: addr-type %u, addr %s, data[%u] ", 166 address_type, bd_addr_to_str(address), length); 167 printf_hexdump(data, length); 168 if (!ad_data_contains_uuid16(length, (uint8_t *) data, REMOTE_SERVICE)) break; 169 printf("Found remote with UUID %04x, connecting...\n", REMOTE_SERVICE); 170 gap_stop_scan(); 171 gap_connect(address,address_type); 172 break; 173 } 174 case SM_EVENT_JUST_WORKS_REQUEST: 175 printf("Just works requested\n"); 176 sm_just_works_confirm(sm_event_just_works_request_get_handle(packet)); 177 break; 178 case SM_EVENT_NUMERIC_COMPARISON_REQUEST: 179 printf("Confirming numeric comparison: %"PRIu32"\n", sm_event_numeric_comparison_request_get_passkey(packet)); 180 sm_numeric_comparison_confirm(sm_event_passkey_display_number_get_handle(packet)); 181 break; 182 case SM_EVENT_PASSKEY_DISPLAY_NUMBER: 183 printf("Display Passkey: %"PRIu32"\n", sm_event_passkey_display_number_get_passkey(packet)); 184 break; 185 case SM_EVENT_PAIRING_COMPLETE: 186 switch (sm_event_pairing_complete_get_status(packet)){ 187 case ERROR_CODE_SUCCESS: 188 printf("Pairing complete, success\n"); 189 break; 190 case ERROR_CODE_CONNECTION_TIMEOUT: 191 printf("Pairing failed, timeout\n"); 192 break; 193 case ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION: 194 printf("Pairing faileed, disconnected\n"); 195 break; 196 case ERROR_CODE_AUTHENTICATION_FAILURE: 197 printf("Pairing failed, reason = %u\n", sm_event_pairing_complete_get_reason(packet)); 198 break; 199 default: 200 break; 201 } 202 break; 203 case HCI_EVENT_LE_META: 204 // wait for connection complete 205 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 206 con_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 207 // start pairing 208 sm_request_pairing(con_handle); 209 break; 210 case HCI_EVENT_ENCRYPTION_CHANGE: 211 con_handle = hci_event_encryption_change_get_connection_handle(packet); 212 printf("Connection encrypted: %u\n", hci_event_encryption_change_get_encryption_enabled(packet)); 213 break; 214 default: 215 break; 216 } 217 } 218 /* LISTING_END */ 219 220 int btstack_main(void); 221 int btstack_main(void) 222 { 223 sm_pairing_central_setup(); 224 225 // turn on! 226 hci_power_control(HCI_POWER_ON); 227 228 return 0; 229 } 230 231 /* EXAMPLE_END */ 232