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btstack/example/gatt_browser.c

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/*
* 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
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define __BTSTACK_FILE__ "gatt_browser.c"
// *****************************************************************************
/* EXAMPLE_START(gatt_browser): GATT Client - Discovering primary services and their characteristics
*
* @text This example shows how to use the GATT Client
* API to discover primary services and their characteristics of the first found
* device that is advertising its services.
*
* The logic is divided between the HCI and GATT client packet handlers.
* The HCI packet handler is responsible for finding a remote device,
* connecting to it, and for starting the first GATT client query.
* Then, the GATT client packet handler receives all primary services and
* requests the characteristics of the last one to keep the example short.
*
*/
// *****************************************************************************
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
#include "gatt_browser.h"
typedef struct advertising_report {
uint8_t type;
uint8_t event_type;
uint8_t address_type;
bd_addr_t address;
uint8_t rssi;
uint8_t length;
const uint8_t * data;
} advertising_report_t;
static bd_addr_t cmdline_addr = { };
static int cmdline_addr_found = 0;
static hci_con_handle_t connection_handler;
static gatt_client_service_t services[40];
static int service_count = 0;
static int service_index = 0;
static btstack_packet_callback_registration_t hci_event_callback_registration;
/* @section GATT client setup
*
* @text In the setup phase, a GATT client must register the HCI and GATT client
* packet handlers, as shown in Listing GATTClientSetup.
* Additionally, the security manager can be setup, if signed writes, or
* encrypted, or authenticated connection are required, to access the
* characteristics, as explained in Section on [SMP](../protocols/#sec:smpProtocols).
*/
/* LISTING_START(GATTClientSetup): Setting up GATT client */
// Handles connect, disconnect, and advertising report events,
// starts the GATT client, and sends the first query.
static void handle_hci_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
// Handles GATT client query results, sends queries and the
// GAP disconnect command when the querying is done.
static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void gatt_client_setup(void){
// register for HCI events
hci_event_callback_registration.callback = &handle_hci_event;
hci_add_event_handler(&hci_event_callback_registration);
// Initialize L2CAP and register HCI event handler
l2cap_init();
// Initialize GATT client
gatt_client_init();
// Optinoally, Setup security manager
sm_init();
sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
}
/* LISTING_END */
static void printUUID(uint8_t * uuid128, uint16_t uuid16){
if (uuid16){
printf("%04x",uuid16);
} else {
printf("%s", uuid128_to_str(uuid128));
}
}
static void dump_advertising_report(advertising_report_t * e){
printf(" * adv. event: evt-type %u, addr-type %u, addr %s, rssi %u, length adv %u, data: ", e->event_type,
e->address_type, bd_addr_to_str(e->address), e->rssi, e->length);
printf_hexdump(e->data, e->length);
}
static void dump_characteristic(gatt_client_characteristic_t * characteristic){
printf(" * characteristic: [0x%04x-0x%04x-0x%04x], properties 0x%02x, uuid ",
characteristic->start_handle, characteristic->value_handle, characteristic->end_handle, characteristic->properties);
printUUID(characteristic->uuid128, characteristic->uuid16);
printf("\n");
}
static void dump_service(gatt_client_service_t * service){
printf(" * service: [0x%04x-0x%04x], uuid ", service->start_group_handle, service->end_group_handle);
printUUID(service->uuid128, service->uuid16);
printf("\n");
}
static void fill_advertising_report_from_packet(advertising_report_t * report, uint8_t *packet){
gap_event_advertising_report_get_address(packet, report->address);
report->event_type = gap_event_advertising_report_get_advertising_event_type(packet);
report->address_type = gap_event_advertising_report_get_address_type(packet);
report->rssi = gap_event_advertising_report_get_rssi(packet);
report->length = gap_event_advertising_report_get_data_length(packet);
report->data = gap_event_advertising_report_get_data(packet);
}
/* @section HCI packet handler
*
* @text The HCI packet handler has to start the scanning,
* to find the first advertising device, to stop scanning, to connect
* to and later to disconnect from it, to start the GATT client upon
* the connection is completed, and to send the first query - in this
* case the gatt_client_discover_primary_services() is called, see
* Listing GATTBrowserHCIPacketHandler.
*/
/* LISTING_START(GATTBrowserHCIPacketHandler): Connecting and disconnecting from the GATT client */
static void handle_hci_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
if (packet_type != HCI_EVENT_PACKET) return;
advertising_report_t report;
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) break;
if (cmdline_addr_found){
printf("Trying to connect to %s\n", bd_addr_to_str(cmdline_addr));
gap_connect(cmdline_addr, 0);
break;
}
printf("BTstack activated, start scanning!\n");
gap_set_scan_parameters(0,0x0030, 0x0030);
gap_start_scan();
break;
case GAP_EVENT_ADVERTISING_REPORT:
fill_advertising_report_from_packet(&report, packet);
dump_advertising_report(&report);
// stop scanning, and connect to the device
gap_stop_scan();
gap_connect(report.address,report.address_type);
break;
case HCI_EVENT_LE_META:
// wait for connection complete
if (hci_event_le_meta_get_subevent_code(packet) != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break;
connection_handler = hci_subevent_le_connection_complete_get_connection_handle(packet);
// query primary services
gatt_client_discover_primary_services(handle_gatt_client_event, connection_handler);
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:
printf("\nGATT browser - DISCONNECTED\n");
break;
default:
break;
}
}
/* LISTING_END */
/* @section GATT Client event handler
*
* @text Query results and further queries are handled by the GATT client packet
* handler, as shown in Listing GATTBrowserQueryHandler. Here, upon
* receiving the primary services, the
* gatt_client_discover_characteristics_for_service() query for the last
* received service is sent. After receiving the characteristics for the service,
* gap_disconnect is called to terminate the connection. Upon
* disconnect, the HCI packet handler receives the disconnect complete event.
*/
/* LISTING_START(GATTBrowserQueryHandler): Handling of the GATT client queries */
static int search_services = 1;
static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(packet_type);
UNUSED(channel);
UNUSED(size);
gatt_client_service_t service;
gatt_client_characteristic_t characteristic;
switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_SERVICE_QUERY_RESULT:\
gatt_event_service_query_result_get_service(packet, &service);
dump_service(&service);
services[service_count++] = service;
break;
case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT:
gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic);
dump_characteristic(&characteristic);
break;
case GATT_EVENT_QUERY_COMPLETE:
if (search_services){
// GATT_EVENT_QUERY_COMPLETE of search services
service_index = 0;
printf("\nGATT browser - CHARACTERISTIC for SERVICE %s\n", uuid128_to_str(service.uuid128));
search_services = 0;
gatt_client_discover_characteristics_for_service(handle_gatt_client_event, connection_handler, &services[service_index]);
} else {
// GATT_EVENT_QUERY_COMPLETE of search characteristics
if (service_index < service_count) {
service = services[service_index++];
printf("\nGATT browser - CHARACTERISTIC for SERVICE %s, [0x%04x-0x%04x]\n",
uuid128_to_str(service.uuid128), service.start_group_handle, service.end_group_handle);
gatt_client_discover_characteristics_for_service(handle_gatt_client_event, connection_handler, &service);
break;
}
service_index = 0;
gap_disconnect(connection_handler);
}
break;
default:
break;
}
}
/* LISTING_END */
#ifdef HAVE_BTSTACK_STDIN
static void usage(const char *name){
fprintf(stderr, "\nUsage: %s [-a|--address aa:bb:cc:dd:ee:ff]\n", name);
fprintf(stderr, "If no argument is provided, GATT browser will start scanning and connect to the first found device.\nTo connect to a specific device use argument [-a].\n\n");
}
#endif
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
#ifdef HAVE_BTSTACK_STDIN
int arg = 1;
cmdline_addr_found = 0;
while (arg < argc) {
if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){
arg++;
cmdline_addr_found = sscanf_bd_addr(argv[arg], cmdline_addr);
arg++;
continue;
}
usage(argv[0]);
return 0;
}
#else
(void)argc;
(void)argv;
#endif
// setup ATT server - only needed if LE Peripheral does ATT queries on its own, e.g. Android phones
att_server_init(profile_data, NULL, NULL);
// setup GATT client
gatt_client_setup();
// turn on!
hci_power_control(HCI_POWER_ON);
return 0;
}
/* EXAMPLE_END */
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