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 // ***************************************************************************** 39 /* EXAMPLE_START(sdp_general_query): Dump remote SDP Records 40 * 41 * @text The example shows how the SDP Client is used to get a list of 42 * service records on a remote device. 43 */ 44 // ***************************************************************************** 45 46 #include "btstack_config.h" 47 48 #include <stdint.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 53 #include "btstack_event.h" 54 #include "btstack_memory.h" 55 #include "btstack_run_loop.h" 56 #include "classic/sdp_client.h" 57 #include "classic/sdp_util.h" 58 #include "hci.h" 59 #include "hci_cmd.h" 60 #include "hci_dump.h" 61 #include "l2cap.h" 62 63 int record_id = -1; 64 int attribute_id = -1; 65 66 static uint8_t attribute_value[1000]; 67 static const int attribute_value_buffer_size = sizeof(attribute_value); 68 static btstack_packet_callback_registration_t hci_event_callback_registration; 69 70 /* @section SDP Client Setup 71 * 72 * @text SDP is based on L2CAP. To receive SDP query events you must register a 73 * callback, i.e. query handler, with the SPD parser, as shown in 74 * Listing SDPClientInit. Via this handler, the SDP client will receive the following events: 75 * - SDP_EVENT_QUERY_ATTRIBUTE_VALUE containing the results of the query in chunks, 76 * - SDP_EVENT_QUERY_COMPLETE indicating the end of the query and the status 77 */ 78 79 /* LISTING_START(SDPClientInit): SDP client setup */ 80 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 81 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 82 83 static void sdp_client_init(void){ 84 85 // register for HCI events 86 hci_event_callback_registration.callback = &packet_handler; 87 hci_add_event_handler(&hci_event_callback_registration); 88 89 // init L2CAP 90 l2cap_init(); 91 } 92 /* LISTING_END */ 93 94 /* @section SDP Client Query 95 * 96 * @text To trigger an SDP query to get the a list of service records on a remote device, 97 * you need to call sdp_client_query_uuid16() with the remote address and the 98 * UUID of the public browse group, as shown in Listing SDPQueryUUID. 99 * In this example we used fixed address of the remote device shown in Listing Remote. 100 * Please update it with the address of a device in your vicinity, e.g., one reported 101 * by the GAP Inquiry example in the previous section. 102 */ 103 104 /* LISTING_START(Remote): Address of remote device in big-endian order */ 105 static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3}; 106 /* LISTING_END */ 107 108 /* LISTING_START(SDPQueryUUID): Querying a list of service records on a remote device. */ 109 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 110 if (packet_type != HCI_EVENT_PACKET) return; 111 uint8_t event = hci_event_packet_get_type(packet); 112 113 switch (event) { 114 case BTSTACK_EVENT_STATE: 115 if (packet[2] == HCI_STATE_WORKING){ 116 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, SDP_PublicBrowseGroup); 117 } 118 break; 119 default: 120 break; 121 } 122 } 123 /* LISTING_END */ 124 125 static void assertBuffer(int size){ 126 if (size > attribute_value_buffer_size){ 127 printf("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, size); 128 } 129 } 130 131 /* @section Handling SDP Client Query Results 132 * 133 * @text The SDP Client returns the results of the query in chunks. Each result 134 * packet contains the record ID, the Attribute ID, and a chunk of the Attribute 135 * value. 136 * In this example, we append new chunks for the same Attribute ID in a large buffer, 137 * see Listing HandleSDPQUeryResult. 138 * 139 * To save memory, it's also possible to process these chunks directly by a custom stream parser, 140 * similar to the way XML files are parsed by a SAX parser. Have a look at *src/sdp_client_rfcomm.c* 141 * which retrieves the RFCOMM channel number and the service name. 142 */ 143 144 /* LISTING_START(HandleSDPQUeryResult): Handling query result chunks. */ 145 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 146 switch (packet[0]){ 147 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 148 // handle new record 149 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id){ 150 record_id = sdp_event_query_attribute_byte_get_record_id(packet); 151 printf("\n---\nRecord nr. %u\n", record_id); 152 } 153 154 assertBuffer(sdp_event_query_attribute_byte_get_attribute_length(packet)); 155 156 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 157 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)){ 158 printf("Attribute 0x%04x: ", sdp_event_query_attribute_byte_get_attribute_id(packet)); 159 de_dump_data_element(attribute_value); 160 } 161 break; 162 case SDP_EVENT_QUERY_COMPLETE: 163 printf("General query done with status %d.\n\n", sdp_event_query_complete_get_status(packet)); 164 exit(0); 165 break; 166 } 167 } 168 /* LISTING_END */ 169 170 int btstack_main(int argc, const char * argv[]); 171 int btstack_main(int argc, const char * argv[]){ 172 173 printf("Client HCI init done\r\n"); 174 175 sdp_client_init(); 176 177 // turn on! 178 hci_power_control(HCI_POWER_ON); 179 180 return 0; 181 } 182 183 /* EXAMPLE_END */ 184