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__ "sdp_general_query.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(sdp_general_query): Dump 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 int record_id = -1; 58 int attribute_id = -1; 59 60 static uint8_t attribute_value[1000]; 61 static const int attribute_value_buffer_size = sizeof(attribute_value); 62 static btstack_packet_callback_registration_t hci_event_callback_registration; 63 64 /* @section SDP Client Setup 65 * 66 * @text SDP is based on L2CAP. To receive SDP query events you must register a 67 * callback, i.e. query handler, with the SPD parser, as shown in 68 * Listing SDPClientInit. Via this handler, the SDP client will receive the following events: 69 * - SDP_EVENT_QUERY_ATTRIBUTE_VALUE containing the results of the query in chunks, 70 * - SDP_EVENT_QUERY_COMPLETE indicating the end of the query and the status 71 */ 72 73 /* LISTING_START(SDPClientInit): SDP client setup */ 74 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 75 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 76 77 static void sdp_client_init(void){ 78 79 // register for HCI events 80 hci_event_callback_registration.callback = &packet_handler; 81 hci_add_event_handler(&hci_event_callback_registration); 82 83 // init L2CAP 84 l2cap_init(); 85 } 86 /* LISTING_END */ 87 88 /* @section SDP Client Query 89 * 90 * @text To trigger an SDP query to get the a list of service records on a remote device, 91 * you need to call sdp_client_query_uuid16() with the remote address and the 92 * UUID of the public browse group, as shown in Listing SDPQueryUUID. 93 * In this example we used fixed address of the remote device shown in Listing Remote. 94 * Please update it with the address of a device in your vicinity, e.g., one reported 95 * by the GAP Inquiry example in the previous section. 96 */ 97 98 /* LISTING_START(Remote): Address of remote device in big-endian order */ 99 static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3}; 100 /* LISTING_END */ 101 102 /* LISTING_START(SDPQueryUUID): Querying a list of service records on a remote device. */ 103 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 104 UNUSED(channel); 105 UNUSED(size); 106 107 if (packet_type != HCI_EVENT_PACKET) return; 108 uint8_t event = hci_event_packet_get_type(packet); 109 110 switch (event) { 111 case BTSTACK_EVENT_STATE: 112 // BTstack activated, get started 113 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 114 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT); 115 } 116 break; 117 default: 118 break; 119 } 120 } 121 /* LISTING_END */ 122 123 static void assertBuffer(int size){ 124 if (size > attribute_value_buffer_size){ 125 printf("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, size); 126 } 127 } 128 129 /* @section Handling SDP Client Query Results 130 * 131 * @text The SDP Client returns the results of the query in chunks. Each result 132 * packet contains the record ID, the Attribute ID, and a chunk of the Attribute 133 * value. 134 * In this example, we append new chunks for the same Attribute ID in a large buffer, 135 * see Listing HandleSDPQUeryResult. 136 * 137 * To save memory, it's also possible to process these chunks directly by a custom stream parser, 138 * similar to the way XML files are parsed by a SAX parser. Have a look at *src/sdp_client_rfcomm.c* 139 * which retrieves the RFCOMM channel number and the service name. 140 */ 141 142 /* LISTING_START(HandleSDPQUeryResult): Handling query result chunks. */ 143 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 144 UNUSED(packet_type); 145 UNUSED(channel); 146 UNUSED(size); 147 148 switch (packet[0]){ 149 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 150 // handle new record 151 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id){ 152 record_id = sdp_event_query_attribute_byte_get_record_id(packet); 153 printf("\n---\nRecord nr. %u\n", record_id); 154 } 155 156 assertBuffer(sdp_event_query_attribute_byte_get_attribute_length(packet)); 157 158 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 159 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)){ 160 printf("Attribute 0x%04x: ", sdp_event_query_attribute_byte_get_attribute_id(packet)); 161 de_dump_data_element(attribute_value); 162 } 163 break; 164 case SDP_EVENT_QUERY_COMPLETE: 165 if (sdp_event_query_complete_get_status(packet)){ 166 printf("SDP query failed 0x%02x\n", sdp_event_query_complete_get_status(packet)); 167 break; 168 } 169 printf("SDP query done.\n"); 170 break; 171 } 172 } 173 /* LISTING_END */ 174 175 int btstack_main(int argc, const char * argv[]); 176 int btstack_main(int argc, const char * argv[]){ 177 (void)argc; 178 (void)argv; 179 180 printf("Client HCI init done\r\n"); 181 182 sdp_client_init(); 183 184 // turn on! 185 hci_power_control(HCI_POWER_ON); 186 187 return 0; 188 } 189 190 /* EXAMPLE_END */ 191