/*
* Copyright (C) 2014 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
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*
*/
#define __BTSTACK_FILE__ "sdp_general_query.c"
// *****************************************************************************
/* EXAMPLE_START(sdp_general_query): Dump remote SDP Records
*
* @text The example shows how the SDP Client is used to get a list of
* service records on a remote device.
*/
// *****************************************************************************
#include "btstack_config.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
int record_id = -1;
int attribute_id = -1;
static uint8_t attribute_value[1000];
static const int attribute_value_buffer_size = sizeof(attribute_value);
static btstack_packet_callback_registration_t hci_event_callback_registration;
/* @section SDP Client Setup
*
* @text SDP is based on L2CAP. To receive SDP query events you must register a
* callback, i.e. query handler, with the SPD parser, as shown in
* Listing SDPClientInit. Via this handler, the SDP client will receive the following events:
* - SDP_EVENT_QUERY_ATTRIBUTE_VALUE containing the results of the query in chunks,
* - SDP_EVENT_QUERY_COMPLETE indicating the end of the query and the status
*/
/* LISTING_START(SDPClientInit): SDP client setup */
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void sdp_client_init(void){
// register for HCI events
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// init L2CAP
l2cap_init();
}
/* LISTING_END */
/* @section SDP Client Query
*
* @text To trigger an SDP query to get the a list of service records on a remote device,
* you need to call sdp_client_query_uuid16() with the remote address and the
* UUID of the public browse group, as shown in Listing SDPQueryUUID.
* In this example we used fixed address of the remote device shown in Listing Remote.
* Please update it with the address of a device in your vicinity, e.g., one reported
* by the GAP Inquiry example in the previous section.
*/
/* LISTING_START(Remote): Address of remote device in big-endian order */
static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3};
/* LISTING_END */
/* LISTING_START(SDPQueryUUID): Querying a list of service records on a remote device. */
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
if (packet_type != HCI_EVENT_PACKET) return;
uint8_t event = hci_event_packet_get_type(packet);
switch (event) {
case BTSTACK_EVENT_STATE:
// BTstack activated, get started
if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){
sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT);
}
break;
default:
break;
}
}
/* LISTING_END */
static void assertBuffer(int size){
if (size > attribute_value_buffer_size){
printf("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, size);
}
}
/* @section Handling SDP Client Query Results
*
* @text The SDP Client returns the results of the query in chunks. Each result
* packet contains the record ID, the Attribute ID, and a chunk of the Attribute
* value.
* In this example, we append new chunks for the same Attribute ID in a large buffer,
* see Listing HandleSDPQUeryResult.
*
* To save memory, it's also possible to process these chunks directly by a custom stream parser,
* similar to the way XML files are parsed by a SAX parser. Have a look at *src/sdp_client_rfcomm.c*
* which retrieves the RFCOMM channel number and the service name.
*/
/* LISTING_START(HandleSDPQUeryResult): Handling query result chunks. */
static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(packet_type);
UNUSED(channel);
UNUSED(size);
switch (packet[0]){
case SDP_EVENT_QUERY_ATTRIBUTE_VALUE:
// handle new record
if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id){
record_id = sdp_event_query_attribute_byte_get_record_id(packet);
printf("\n---\nRecord nr. %u\n", record_id);
}
assertBuffer(sdp_event_query_attribute_byte_get_attribute_length(packet));
attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet);
if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)){
printf("Attribute 0x%04x: ", sdp_event_query_attribute_byte_get_attribute_id(packet));
de_dump_data_element(attribute_value);
}
break;
case SDP_EVENT_QUERY_COMPLETE:
if (sdp_event_query_complete_get_status(packet)){
printf("SDP query failed 0x%02x\n", sdp_event_query_complete_get_status(packet));
break;
}
printf("SDP query done.\n");
break;
}
}
/* LISTING_END */
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
(void)argc;
(void)argv;
printf("Client HCI init done\r\n");
sdp_client_init();
// turn on!
hci_power_control(HCI_POWER_ON);
return 0;
}
/* EXAMPLE_END */