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 hci_event_callback_registration.callback = &packet_handler; 83 hci_add_event_handler(&hci_event_callback_registration); 84 85 l2cap_init(); 86 87 // setup le device db 88 le_device_db_init(); 89 90 // setup SM: Display only 91 sm_init(); 92 sm_event_callback_registration.callback = &packet_handler; 93 sm_add_event_handler(&sm_event_callback_registration); 94 95 // setup ATT server 96 att_server_init(profile_data, NULL, NULL); 97 att_server_register_packet_handler(packet_handler); 98 99 /** 100 * Choose ONE of the following configurations 101 */ 102 103 // LE Legacy Pairing, Just Works 104 sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 105 sm_set_authentication_requirements(SM_AUTHREQ_NO_BONDING); 106 107 // LE Legacy Pairing, Passkey entry initiator enter, responder (us) displays 108 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY); 109 // sm_set_authentication_requirements(SM_AUTHREQ_MITM_PROTECTION); 110 // sm_use_fixed_passkey_in_display_role(123456); 111 112 #ifdef ENABLE_LE_SECURE_CONNECTIONS 113 // LE Secure Connetions, Just Works 114 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 115 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION); 116 117 // LE Secure Connections, Numeric Comparison 118 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_YES_NO); 119 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION|SM_AUTHREQ_MITM_PROTECTION); 120 121 // LE Legacy Pairing, Passkey entry initiator enter, responder (us) displays 122 // sm_set_io_capabilities(IO_CAPABILITY_DISPLAY_ONLY); 123 // sm_set_authentication_requirements(SM_AUTHREQ_SECURE_CONNECTION|SM_AUTHREQ_MITM_PROTECTION); 124 // sm_use_fixed_passkey_in_display_role(123456); 125 #endif 126 } 127 128 /* LISTING_END */ 129 130 /* @section HCI packet handler 131 * 132 * @text The HCI packet handler has to start the scanning, 133 * and to handle received advertisements. Advertisements are received 134 * as HCI event packets of the GAP_EVENT_ADVERTISING_REPORT type, 135 * see Listing GAPLEAdvPacketHandler. 136 */ 137 138 /* LISTING_START(GAPLEAdvPacketHandler): Scanning and receiving advertisements */ 139 140 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 141 UNUSED(channel); 142 UNUSED(size); 143 144 if (packet_type != HCI_EVENT_PACKET) return; 145 hci_con_handle_t con_handle; 146 147 switch (hci_event_packet_get_type(packet)) { 148 case BTSTACK_EVENT_STATE: 149 // BTstack activated, get started 150 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 151 printf("Start scaning!\n"); 152 gap_set_scan_parameters(1,0x0030, 0x0030); 153 gap_start_scan(); 154 } 155 break; 156 case GAP_EVENT_ADVERTISING_REPORT:{ 157 bd_addr_t address; 158 gap_event_advertising_report_get_address(packet, address); 159 uint8_t address_type = gap_event_advertising_report_get_address_type(packet); 160 uint8_t length = gap_event_advertising_report_get_data_length(packet); 161 const uint8_t * data = gap_event_advertising_report_get_data(packet); 162 printf("Advertisement event: addr-type %u, addr %s, data[%u] ", 163 address_type, bd_addr_to_str(address), length); 164 printf_hexdump(data, length); 165 if (!ad_data_contains_uuid16(length, (uint8_t *) data, REMOTE_SERVICE)) break; 166 printf("Found remote with UUID %04x, connecting...\n", REMOTE_SERVICE); 167 gap_stop_scan(); 168 gap_connect(address,address_type); 169 break; 170 } 171 case SM_EVENT_JUST_WORKS_REQUEST: 172 printf("Just works requested\n"); 173 sm_just_works_confirm(sm_event_just_works_request_get_handle(packet)); 174 break; 175 case SM_EVENT_NUMERIC_COMPARISON_REQUEST: 176 printf("Confirming numeric comparison: %"PRIu32"\n", sm_event_numeric_comparison_request_get_passkey(packet)); 177 sm_numeric_comparison_confirm(sm_event_passkey_display_number_get_handle(packet)); 178 break; 179 case SM_EVENT_PASSKEY_DISPLAY_NUMBER: 180 printf("Display Passkey: %"PRIu32"\n", sm_event_passkey_display_number_get_passkey(packet)); 181 break; 182 case HCI_EVENT_LE_META: 183 // wait for connection complete 184 if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break; 185 con_handle = hci_subevent_le_connection_complete_get_connection_handle(packet); 186 // start pairing 187 sm_request_pairing(con_handle); 188 break; 189 case HCI_EVENT_ENCRYPTION_CHANGE: 190 con_handle = hci_event_encryption_change_get_connection_handle(packet); 191 printf("Connection encrypted: %u\n", hci_event_encryption_change_get_encryption_enabled(packet)); 192 break; 193 default: 194 break; 195 } 196 } 197 /* LISTING_END */ 198 199 int btstack_main(void); 200 int btstack_main(void) 201 { 202 sm_pairing_central_setup(); 203 204 // turn on! 205 hci_power_control(HCI_POWER_ON); 206 207 return 0; 208 } 209 210 /* EXAMPLE_END */ 211