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btstack/example/gatt_battery_query.c
Milanka Ringwald ec8ae085b4 docu: copy editing examples titles
2020-10-23 09:55:01 +02:00

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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
*
*/
#define BTSTACK_FILE__ "gatt_battery_query.c"
// *****************************************************************************
/* EXAMPLE_START(gatt_battery_query): GATT Battery Client
*
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
// gatt_battery_query.gatt contains the declaration of the provided GATT Services + Characteristics
// gatt_battery_query.h contains the binary representation of gatt_battery_query.gatt
// it is generated by the build system by calling: $BTSTACK_ROOT/tool/compile_gatt.py gatt_battery_query.gatt gatt_battery_query.h
// it needs to be regenerated when the GATT Database declared in gatt_battery_query.gatt file is modified
#include "gatt_battery_query.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;
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 int blacklist_index = 0;
static bd_addr_t blacklist[20];
static advertising_report_t report;
static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static bd_addr_t cmdline_addr;
static int cmdline_addr_found = 0;
static hci_con_handle_t connection_handle;
static uint16_t battery_service_uuid = 0x180F;
static uint16_t battery_level_characteristic_uuid = 0x2a19;
static gatt_client_service_t battery_service;
static gatt_client_characteristic_t battery_level_characteristic;
static gc_state_t state = TC_IDLE;
static btstack_packet_callback_registration_t hci_event_callback_registration;
static gatt_client_notification_t notification_listener;
static int listener_registered;
static void printUUID(uint8_t * uuid128, uint16_t uuid16){
if (uuid16){
printf("%04x",uuid16);
} else {
printf("%s", uuid128_to_str(uuid128));
}
}
static int blacklist_size(void){
return sizeof(blacklist) / sizeof(bd_addr_t);
}
static int blacklist_contains(bd_addr_t addr){
int i;
for (i=0; i<blacklist_size(); i++){
if (bd_addr_cmp(addr, blacklist[i]) == 0) return 1;
}
return 0;
}
static void add_to_blacklist(bd_addr_t addr){
printf("%s added to blacklist (no battery service found\n", bd_addr_to_str(addr));
bd_addr_copy(blacklist[blacklist_index], addr);
blacklist_index = (blacklist_index + 1) % blacklist_size();
}
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(uint8_t * blob, uint16_t blob_length){
printf(" * characteristic value of length %d *** ", blob_length );
printf_hexdump(blob , blob_length);
printf("\n");
}
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 handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(packet_type);
UNUSED(channel);
UNUSED(size);
int status;
uint8_t battery_level;
switch(state){
case TC_W4_SERVICE_RESULT:
switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_SERVICE_QUERY_RESULT:
gatt_event_service_query_result_get_service(packet, &battery_service);
dump_service(&battery_service);
break;
case GATT_EVENT_QUERY_COMPLETE:
if (packet[4] != 0){
printf("SERVICE_QUERY_RESULT - Error status %x.\n", packet[4]);
add_to_blacklist(report.address);
gap_disconnect(connection_handle);
break;
}
state = TC_W4_CHARACTERISTIC_RESULT;
printf("\nSearch for battery level characteristic.\n");
gatt_client_discover_characteristics_for_service_by_uuid16(handle_gatt_client_event, connection_handle, &battery_service, battery_level_characteristic_uuid);
break;
default:
break;
}
break;
case TC_W4_CHARACTERISTIC_RESULT:
switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT:
gatt_event_characteristic_query_result_get_characteristic(packet, &battery_level_characteristic);
dump_characteristic(&battery_level_characteristic);
break;
case GATT_EVENT_QUERY_COMPLETE:
if (packet[4] != 0){
printf("CHARACTERISTIC_QUERY_RESULT - Error status %x.\n", packet[4]);
add_to_blacklist(report.address);
gap_disconnect(connection_handle);
break;
}
// register handler for notifications
listener_registered = 1;
gatt_client_listen_for_characteristic_value_updates(&notification_listener, handle_gatt_client_event, connection_handle, &battery_level_characteristic);
state = TC_W4_BATTERY_DATA;
printf("\nConfigure battery level characteristic for notify.\n");
status = gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, &battery_level_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
if (status != 0){
printf("\nNotification not supported. Query value of characteristic.\n");
gatt_client_read_value_of_characteristic(handle_gatt_client_event, connection_handle, &battery_level_characteristic);
}
break;
default:
break;
}
break;
case TC_W4_BATTERY_DATA:
switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_NOTIFICATION:
printf("\nBattery Data:\n");
dump_characteristic_value(&packet[8], little_endian_read_16(packet, 6));
break;
case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT:
if (gatt_event_characteristic_value_query_result_get_value_length(packet) < 1) break;
battery_level = gatt_event_characteristic_value_query_result_get_value(packet)[0];
printf("Battery level %d \n", battery_level);
break;
case GATT_EVENT_QUERY_COMPLETE:
if (packet[4] != 0){
printf("CHARACTERISTIC_VALUE_QUERY_RESULT - Error status %x.\n", packet[4]);
break;
}
break;
default:
printf("Unknown packet type %x\n", hci_event_packet_get_type(packet));
break;
}
break;
default:
printf("error\n");
break;
}
}
static void fill_advertising_report_from_packet(advertising_report_t * adv_report, uint8_t *packet){
gap_event_advertising_report_get_address(packet, adv_report->address);
adv_report->event_type = gap_event_advertising_report_get_advertising_event_type(packet);
adv_report->address_type = gap_event_advertising_report_get_address_type(packet);
adv_report->rssi = gap_event_advertising_report_get_rssi(packet);
adv_report->length = gap_event_advertising_report_get_data_length(packet);
adv_report->data = gap_event_advertising_report_get_data(packet);
}
static void hci_event_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) break;
if (cmdline_addr_found){
printf("Connect to %s\n", bd_addr_to_str(cmdline_addr));
state = TC_W4_CONNECT;
gap_connect(cmdline_addr, 0);
break;
}
printf("Start scanning!\n");
state = TC_W4_SCAN_RESULT;
gap_set_scan_parameters(0,0x0030, 0x0030);
gap_start_scan();
break;
case GAP_EVENT_ADVERTISING_REPORT:
if (state != TC_W4_SCAN_RESULT) return;
fill_advertising_report_from_packet(&report, packet);
if (blacklist_contains(report.address)) {
break;
}
dump_advertising_report(&report);
// stop scanning, and connect to the device
state = TC_W4_CONNECT;
gap_stop_scan();
printf("Stop scan. Connect to device with addr %s.\n", bd_addr_to_str(report.address));
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;
if (state != TC_W4_CONNECT) return;
connection_handle = hci_subevent_le_connection_complete_get_connection_handle(packet);
// initialize gatt client context with handle, and add it to the list of active clients
// query primary services
printf("\nSearch for battery service.\n");
state = TC_W4_SERVICE_RESULT;
gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, battery_service_uuid);
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:
// unregister listener
connection_handle = HCI_CON_HANDLE_INVALID;
if (listener_registered){
listener_registered = 0;
gatt_client_stop_listening_for_characteristic_value_updates(&notification_listener);
}
if (cmdline_addr_found){
printf("\nDisconnected %s\n", bd_addr_to_str(cmdline_addr));
return;
}
printf("\nDisconnected %s\n", bd_addr_to_str(report.address));
printf("Restart scan.\n");
state = TC_W4_SCAN_RESULT;
gap_start_scan();
break;
default:
break;
}
}
#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++;
if (!cmdline_addr_found) exit(1);
continue;
}
usage(argv[0]);
return 0;
}
#else
(void)argc;
(void)argv;
#endif
l2cap_init();
// 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);
// GATT Client setup
gatt_client_init();
sm_init();
sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
hci_event_callback_registration.callback = &hci_event_handler;
hci_add_event_handler(&hci_event_callback_registration);
// turn on!
hci_power_control(HCI_POWER_ON);
return 0;
}
/* EXAMPLE_END */
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