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 BLUEKITCHEN 24 * GMBH 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__ "sdp_general_query.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(sdp_general_query): SDP Client - Query Remote SDP Records 42 * 43 * @text The example shows how the SDP Client is used to get a list of 44 * service records on a remote device. 45 */ 46 // ***************************************************************************** 47 48 #include "btstack_config.h" 49 50 #include <stdint.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 55 #include "btstack.h" 56 57 58 #ifndef HAVE_POSIX_FILE_IO 59 // Jambox static const char * remote_addr_string = "00:21:3C:AC:F7:38"; 60 // Mac static const char * remote_addr_string = "F0:18:98:60:3E:E5"; 61 // iPhone 5S: 62 static const char * remote_addr_string = "6C:72:E7:10:22:EE"; 63 #endif 64 65 static bd_addr_t remote_addr; 66 67 static int record_id = -1; 68 69 static uint8_t attribute_value[1000]; 70 static const int attribute_value_buffer_size = sizeof(attribute_value); 71 static btstack_packet_callback_registration_t hci_event_callback_registration; 72 73 /* @section SDP Client Setup 74 * 75 * @text SDP is based on L2CAP. To receive SDP query events you must register a 76 * callback, i.e. query handler, with the SPD parser, as shown in 77 * Listing SDPClientInit. Via this handler, the SDP client will receive the following events: 78 * - SDP_EVENT_QUERY_ATTRIBUTE_VALUE containing the results of the query in chunks, 79 * - SDP_EVENT_QUERY_COMPLETE indicating the end of the query and the status 80 */ 81 82 /* LISTING_START(SDPClientInit): SDP client setup */ 83 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 84 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 85 86 static void sdp_general_query_init(void){ 87 // init L2CAP 88 l2cap_init(); 89 90 // register for HCI events 91 hci_event_callback_registration.callback = &packet_handler; 92 hci_add_event_handler(&hci_event_callback_registration); 93 } 94 /* LISTING_END */ 95 96 /* @section SDP Client Query 97 * 98 * @text To trigger an SDP query to get the a list of service records on a remote device, 99 * you need to call sdp_client_query_uuid16() with the remote address and the 100 * UUID of the public browse group, as shown in Listing SDPQueryUUID. 101 * In this example we used fixed address of the remote device shown in Listing Remote. 102 * Please update it with the address of a device in your vicinity, e.g., one reported 103 * by the GAP Inquiry example in the previous section. 104 */ 105 106 /* LISTING_START(SDPQueryUUID): Querying a list of service records on a remote device. */ 107 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 108 UNUSED(channel); 109 UNUSED(size); 110 111 if (packet_type != HCI_EVENT_PACKET) return; 112 uint8_t event = hci_event_packet_get_type(packet); 113 114 switch (event) { 115 case BTSTACK_EVENT_STATE: 116 // BTstack activated, get started 117 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 118 printf("Connecting to %s\n", bd_addr_to_str(remote_addr)); 119 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote_addr, BLUETOOTH_PROTOCOL_L2CAP); 120 } 121 break; 122 default: 123 break; 124 } 125 } 126 /* LISTING_END */ 127 128 static void assertBuffer(int size){ 129 if (size > attribute_value_buffer_size){ 130 printf("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, size); 131 } 132 } 133 134 /* @section Handling SDP Client Query Results 135 * 136 * @text The SDP Client returns the results of the query in chunks. Each result 137 * packet contains the record ID, the Attribute ID, and a chunk of the Attribute 138 * value. 139 * In this example, we append new chunks for the same Attribute ID in a large buffer, 140 * see Listing HandleSDPQUeryResult. 141 * 142 * To save memory, it's also possible to process these chunks directly by a custom stream parser, 143 * similar to the way XML files are parsed by a SAX parser. Have a look at *src/sdp_client_rfcomm.c* 144 * which retrieves the RFCOMM channel number and the service name. 145 */ 146 147 /* LISTING_START(HandleSDPQUeryResult): Handling query result chunks. */ 148 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 149 UNUSED(packet_type); 150 UNUSED(channel); 151 UNUSED(size); 152 153 switch (hci_event_packet_get_type(packet)){ 154 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 155 // handle new record 156 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id){ 157 record_id = sdp_event_query_attribute_byte_get_record_id(packet); 158 printf("\n---\nRecord nr. %u\n", record_id); 159 } 160 161 assertBuffer(sdp_event_query_attribute_byte_get_attribute_length(packet)); 162 163 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 164 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)){ 165 printf("Attribute 0x%04x: ", sdp_event_query_attribute_byte_get_attribute_id(packet)); 166 de_dump_data_element(attribute_value); 167 } 168 break; 169 case SDP_EVENT_QUERY_COMPLETE: 170 if (sdp_event_query_complete_get_status(packet)){ 171 printf("SDP query failed 0x%02x\n", sdp_event_query_complete_get_status(packet)); 172 break; 173 } 174 printf("SDP query done.\n"); 175 break; 176 default: 177 break; 178 } 179 } 180 /* LISTING_END */ 181 182 #ifdef HAVE_POSIX_FILE_IO 183 static void usage(const char *name){ 184 printf("\nUsage: %s -a|--address aa:bb:cc:dd:ee:ff\n", name); 185 printf("Use argument -a to connect to a specific device and dump the result of SDP query for L2CAP services.\n\n"); 186 } 187 #endif 188 189 int btstack_main(int argc, const char * argv[]); 190 int btstack_main(int argc, const char * argv[]){ 191 192 #ifdef HAVE_POSIX_FILE_IO 193 int remote_addr_found = 0; 194 if (argc == 3) { 195 if(!strcmp(argv[1], "-a") || !strcmp(argv[1], "--address")){ 196 remote_addr_found = sscanf_bd_addr(argv[2], remote_addr); 197 } 198 } 199 if (!remote_addr_found){ 200 usage(argv[0]); 201 return 1; 202 } 203 #else 204 (void)argc; 205 (void)argv; 206 sscanf_bd_addr(remote_addr_string, remote_addr); 207 #endif 208 209 sdp_general_query_init(); 210 // turn on! 211 hci_power_control(HCI_POWER_ON); 212 213 return 0; 214 } 215 216 /* EXAMPLE_END */ 217