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btstack/example/embedded/gatt_battery_query.c
matthias.ringwald@gmail.com 2e77e513be Stop using pointer to array for bd_addr_t and link_key_t
2015-03-01 20:51:08 +00:00

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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
*
*/
// *****************************************************************************
//
// BLE Client
//
// *****************************************************************************
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <btstack/run_loop.h>
#include <btstack/hci_cmds.h>
#include <btstack/utils.h>
#include <btstack/sdp_util.h>
#include "btstack-config.h"
#include "ad_parser.h"
#include "debug.h"
#include "btstack_memory.h"
#include "hci.h"
#include "hci_dump.h"
#include "l2cap.h"
#include "att.h"
#include "gatt_client.h"
#include "sm.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;
uint8_t * data;
} advertising_report_t;
typedef enum {
TC_IDLE,
TC_W4_SCAN_RESULT,
TC_W4_CONNECT,
TC_W4_SERVICE_RESULT,
TC_W4_CHARACTERISTIC_RESULT,
TC_W4_BATTERY_DATA
} gc_state_t;
static bd_addr_t cmdline_addr = { };
static int cmdline_addr_found = 0;
uint16_t gc_id, gc_handle;
static uint16_t battery_service_uuid = 0x180F;
static uint16_t battery_level_characteristic_uuid = 0x2a19;
static le_service_t battery_service;
static le_characteristic_t config_characteristic;
static gc_state_t state = TC_IDLE;
static void printUUID(uint8_t * uuid128, uint16_t uuid16){
if (uuid16){
printf("%04x",uuid16);
} else {
printUUID128(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_value(le_characteristic_value_event_t * event){
printf(" * characteristic value of length %d *** ", event->blob_length );
printf_hexdump(event->blob , event->blob_length);
printf("\n");
}
static void dump_characteristic(le_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(le_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 error_code(int status){
switch(status){
case ATT_ERROR_INSUFFICIENT_AUTHENTICATION:
printf("ATT_ERROR_INSUFFICIENT_AUTHENTICATION. TODO: security manager is not complete yet.\n");
break;
default:
printf(" status 0x%02x\n", status);
break;
}
}
void handle_gatt_client_event(le_event_t * event){
switch(state){
case TC_W4_SERVICE_RESULT:
switch(event->type){
case GATT_SERVICE_QUERY_RESULT:
battery_service = ((le_service_event_t *) event)->service;
printf("Battery service found:\n");
dump_service(&battery_service);
break;
case GATT_QUERY_COMPLETE:
if (!((gatt_complete_event_t *) event)->status){
printf("Battery service not found. Restart scan.\n");
state = TC_W4_SCAN_RESULT;
le_central_start_scan();
break;
}
state = TC_W4_CHARACTERISTIC_RESULT;
printf("\nSearch for battery level characteristic in battery service. ");
gatt_client_discover_characteristics_for_service_by_uuid16(gc_id, gc_handle, &battery_service, battery_level_characteristic_uuid);
break;
default:
break;
}
break;
case TC_W4_CHARACTERISTIC_RESULT:
switch(event->type){
case GATT_CHARACTERISTIC_QUERY_RESULT:
printf("Battery level characteristic found:\n");
config_characteristic = ((le_characteristic_event_t *) event)->characteristic;
dump_characteristic(&config_characteristic);
break;
case GATT_QUERY_COMPLETE:
state = TC_W4_BATTERY_DATA;
printf("\nConfigure battery level characteristic for notify.");
gatt_client_write_client_characteristic_configuration(gc_id, gc_handle, &config_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
break;
default:
break;
}
break;
case TC_W4_BATTERY_DATA:
if (event->type == GATT_QUERY_COMPLETE){
if (((gatt_complete_event_t*)event)->status != 0){
printf("\nNotification is not possible: ");
error_code(((gatt_complete_event_t*)event)->status);
}
break;
}
if (event->type != GATT_NOTIFICATION) break;
printf("\nBattery Data:\n");
dump_characteristic_value((le_characteristic_value_event_t *) event);
break;
default:
printf("error\n");
break;
}
}
static void fill_advertising_report_from_packet(advertising_report_t * report, uint8_t *packet){
int pos = 2;
report->event_type = packet[pos++];
report->address_type = packet[pos++];
memcpy(report->address, &packet[pos], 6);
pos += 6;
report->rssi = packet[pos++];
report->length = packet[pos++];
report->data = &packet[pos];
pos += report->length;
dump_advertising_report(report);
bd_addr_t found_device_addr;
memcpy(found_device_addr, report->address, 6);
swapX(found_device_addr, report->address, 6);
}
static void handle_hci_event(void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
if (packet_type != HCI_EVENT_PACKET) return;
advertising_report_t report;
uint8_t event = packet[0];
switch (event) {
case BTSTACK_EVENT_STATE:
// BTstack activated, get started
if (packet[2] != HCI_STATE_WORKING) break;
if (cmdline_addr_found){
printf("Start connect to %s\n", bd_addr_to_str(cmdline_addr));
state = TC_W4_CONNECT;
le_central_connect(cmdline_addr, 0);
break;
}
printf("BTstack activated, start scanning!\n");
state = TC_W4_SCAN_RESULT;
le_central_set_scan_parameters(0,0x0030, 0x0030);
le_central_start_scan();
break;
case GAP_LE_ADVERTISING_REPORT:
if (state != TC_W4_SCAN_RESULT) return;
fill_advertising_report_from_packet(&report, packet);
// stop scanning, and connect to the device
state = TC_W4_CONNECT;
le_central_stop_scan();
printf("Stop scan. Start connect to device with addr %s.\n", bd_addr_to_str(report.address));
le_central_connect(report.address,report.address_type);
break;
case HCI_EVENT_LE_META:
// wait for connection complete
if (packet[2] != HCI_SUBEVENT_LE_CONNECTION_COMPLETE) break;
if (state != TC_W4_CONNECT) return;
gc_handle = READ_BT_16(packet, 4);
// initialize gatt client context with handle, and add it to the list of active clients
// query primary services
printf("\nSearch for battery service. ");
state = TC_W4_SERVICE_RESULT;
gatt_client_discover_primary_services_by_uuid16(gc_id, gc_handle, battery_service_uuid);
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:
printf("\nDISCONNECTED\n");
exit(0);
break;
default:
break;
}
}
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");
}
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
int arg = 1;
cmdline_addr_found = 0;
while (arg < argc) {
if(!strcmp(argv[arg], "-a") || !strcmp(argv[arg], "--address")){
arg++;
cmdline_addr_found = sscan_bd_addr((uint8_t *)argv[arg], cmdline_addr);
arg++;
continue;
}
usage(argv[0]);
return 0;
}
l2cap_init();
l2cap_register_packet_handler(&handle_hci_event);
gatt_client_init();
gc_id = gatt_client_register_packet_handler(&handle_gatt_client_event);
sm_init();
sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
// turn on!
hci_power_control(HCI_POWER_ON);
// go!
run_loop_execute();
// happy compiler!
return 0;
}
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