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src/ble/gatt-service/battery_service_client.c
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/*
* Copyright (C) 2021 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 BLUEKITCHEN
* GMBH 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__ "battery_service_client.c"
#include "btstack_config.h"
#ifdef ENABLE_TESTING_SUPPORT
#include <stdio.h>
#include <unistd.h>
#endif
#include <stdint.h>
#include <string.h>
#include "ble/gatt-service/battery_service_client.h"
#include "btstack_memory.h"
#include "ble/core.h"
#include "ble/gatt_client.h"
#include "bluetooth_gatt.h"
#include "btstack_debug.h"
#include "btstack_event.h"
#include "btstack_run_loop.h"
#include "gap.h"
#define BATTERY_SERVICE_INVALID_INDEX 0xFF
static btstack_linked_list_t clients;
static uint16_t battery_service_cid_counter = 0;
static btstack_packet_callback_registration_t hci_event_callback_registration;
static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void battery_service_poll_timer_start(battery_service_client_t * client);
static uint16_t battery_service_get_next_cid(void){
battery_service_cid_counter = btstack_next_cid_ignoring_zero(battery_service_cid_counter);
return battery_service_cid_counter;
}
static battery_service_client_t * battery_service_create_client(hci_con_handle_t con_handle, uint16_t cid){
battery_service_client_t * client = btstack_memory_battery_service_client_get();
if (!client){
log_error("Not enough memory to create client");
return NULL;
}
client->cid = cid;
client->con_handle = con_handle;
client->poll_interval_ms = 0;
client->num_instances = 0;
client->service_index = 0;
client->poll_bitmap = 0;
client->need_poll_bitmap = 0;
client->polled_service_index = BATTERY_SERVICE_INVALID_INDEX;
client->state = BATTERY_SERVICE_CLIENT_STATE_IDLE;
btstack_linked_list_add(&clients, (btstack_linked_item_t *) client);
return client;
}
static void battery_service_finalize_client(battery_service_client_t * client){
// stop listening
uint8_t i;
for (i = 0; i < client->num_instances; i++){
gatt_client_stop_listening_for_characteristic_value_updates(&client->services[i].notification_listener);
}
// remove timer
btstack_run_loop_remove_timer(&client->poll_timer);
btstack_linked_list_remove(&clients, (btstack_linked_item_t *) client);
btstack_memory_battery_service_client_free(client);
}
static battery_service_client_t * battery_service_get_client_for_con_handle(hci_con_handle_t con_handle){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, &clients);
while (btstack_linked_list_iterator_has_next(&it)){
battery_service_client_t * client = (battery_service_client_t *)btstack_linked_list_iterator_next(&it);
if (client->con_handle != con_handle) continue;
return client;
}
return NULL;
}
static battery_service_client_t * battery_service_get_client_for_cid(uint16_t battery_service_cid){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, &clients);
while (btstack_linked_list_iterator_has_next(&it)){
battery_service_client_t * client = (battery_service_client_t *)btstack_linked_list_iterator_next(&it);
if (client->cid != battery_service_cid) continue;
return client;
}
return NULL;
}
static void battery_service_emit_connection_established(battery_service_client_t * client, uint8_t status){
uint8_t event[8];
int pos = 0;
event[pos++] = HCI_EVENT_GATTSERVICE_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = GATTSERVICE_SUBEVENT_BATTERY_SERVICE_CONNECTED;
little_endian_store_16(event, pos, client->cid);
pos += 2;
event[pos++] = status;
event[pos++] = client->num_instances;
event[pos++] = client->poll_bitmap;
(*client->client_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
static void battery_service_emit_battery_level(battery_service_client_t * client, uint16_t value_handle, uint8_t att_status, uint8_t battery_level){
uint8_t event[8];
int pos = 0;
event[pos++] = HCI_EVENT_GATTSERVICE_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = GATTSERVICE_SUBEVENT_BATTERY_SERVICE_LEVEL;
little_endian_store_16(event, pos, client->cid);
pos += 2;
uint8_t i;
for (i = 0; i < client->num_instances; i++){
if (value_handle == client->services[i].value_handle){
event[pos++] = i;
event[pos++] = att_status;
event[pos++] = battery_level;
(*client->client_handler)(HCI_EVENT_PACKET, 0, event, sizeof(event));
break;
}
}
}
static bool battery_service_registered_notification(battery_service_client_t * client, uint16_t service_index){
gatt_client_characteristic_t characteristic;
// if there are services without notification, register pool timer,
// otherwise register for notifications
characteristic.value_handle = client->services[service_index].value_handle;
characteristic.properties = client->services[service_index].properties;
characteristic.end_handle = client->services[service_index].end_handle;
uint8_t status = gatt_client_write_client_characteristic_configuration(
&handle_gatt_client_event,
client->con_handle,
&characteristic,
GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
// notification supported, register for value updates
if (status == ERROR_CODE_SUCCESS){
gatt_client_listen_for_characteristic_value_updates(
&client->services[service_index].notification_listener,
&handle_gatt_client_event,
client->con_handle, &characteristic);
} else {
client->poll_bitmap |= 1u << client->service_index;
}
return status;
}
static void battery_service_start_polling_if_needed(battery_service_client_t * client){
if (client->poll_interval_ms > 0){
client->need_poll_bitmap = client->poll_bitmap;
battery_service_poll_timer_start(client);
}
}
static void battery_service_run_for_client(battery_service_client_t * client){
uint8_t status;
uint8_t i;
gatt_client_characteristic_t characteristic;
switch (client->state){
case BATTERY_SERVICE_CLIENT_STATE_CONNECTED:
for (i = 0; i < client->num_instances; i++){
if ( ((client->need_poll_bitmap >> i) & 0x01) == 0x01 ){
// clear bit of polled service
client->need_poll_bitmap &= ~(1u << i);
client->polled_service_index = i;
// poll value of characteristic
characteristic.value_handle = client->services[i].value_handle;
characteristic.properties = client->services[i].properties;
characteristic.end_handle = client->services[i].end_handle;
gatt_client_read_value_of_characteristic(&handle_gatt_client_event, client->con_handle, &characteristic);
break;
}
}
break;
case BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_SERVICE:
client->state = BATTERY_SERVICE_CLIENT_STATE_W4_SERVICE_RESULT;
status = gatt_client_discover_primary_services_by_uuid16(&handle_gatt_client_event, client->con_handle, ORG_BLUETOOTH_SERVICE_BATTERY_SERVICE);
// TODO handle status
break;
case BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTICS:
client->state = BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_RESULT;
gatt_client_discover_characteristics_for_handle_range_by_uuid16(
&handle_gatt_client_event,
client->con_handle,
client->services[client->service_index].start_handle,
client->services[client->service_index].end_handle,
ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL);
break;
#ifdef ENABLE_TESTING_SUPPORT
case BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTIC_DESCRIPTORS:
client->state = BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_DESCRIPTORS_RESULT;
// if there are services without notification, register pool timer,
// othervise register for notifications
characteristic.value_handle = client->services[client->service_index].value_handle;
characteristic.properties = client->services[client->service_index].properties;
characteristic.end_handle = client->services[client->service_index].end_handle;
(void) gatt_client_discover_characteristic_descriptors(&handle_gatt_client_event, client->con_handle, &characteristic);
break;
case BATTERY_SERVICE_CLIENT_W2_READ_CHARACTERISTIC_CONFIGURATION:
printf("Read client characteristic value [Service %d, handle 0x%04X]:\n",
client->service_index,
client->services[client->service_index].ccc_handle);
client->state = BATTERY_SERVICE_CLIENT_W4_CHARACTERISTIC_CONFIGURATION_RESULT;
// result in GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT
(void) gatt_client_read_characteristic_descriptor_using_descriptor_handle(
&handle_gatt_client_event,
client->con_handle,
client->services[client->service_index].ccc_handle);
break;
#endif
case BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION:
client->state = BATTERY_SERVICE_CLIENT_STATE_W4_NOTIFICATION_REGISTERED;
for (; client->service_index < client->num_instances; client->service_index++){
status = battery_service_registered_notification(client, client->service_index);
if (status == ERROR_CODE_SUCCESS) return;
}
#ifdef ENABLE_TESTING_SUPPORT
for (client->service_index = 0; client->service_index < client->num_instances; client->service_index++){
bool need_polling = (client->poll_bitmap & (1 << client->service_index)) != 0;
if ( (client->services[client->service_index].ccc_handle != 0) && !need_polling ){
client->state = BATTERY_SERVICE_CLIENT_W2_READ_CHARACTERISTIC_CONFIGURATION;
break;
}
}
#endif
client->state = BATTERY_SERVICE_CLIENT_STATE_CONNECTED;
battery_service_emit_connection_established(client, ERROR_CODE_SUCCESS);
battery_service_start_polling_if_needed(client);
break;
default:
break;
}
}
static void battery_service_poll_timer_timeout_handler(btstack_timer_source_t * timer){
uint16_t battery_service_cid = (uint16_t)(uintptr_t) btstack_run_loop_get_timer_context(timer);
battery_service_client_t * client = battery_service_get_client_for_cid(battery_service_cid);
btstack_assert(client != NULL);
client->need_poll_bitmap = client->poll_bitmap;
battery_service_poll_timer_start(client);
battery_service_run_for_client(client);
}
static void battery_service_poll_timer_start(battery_service_client_t * client){
btstack_run_loop_set_timer_handler(&client->poll_timer, battery_service_poll_timer_timeout_handler);
btstack_run_loop_set_timer_context(&client->poll_timer, (void *)(uintptr_t)client->cid);
btstack_run_loop_set_timer(&client->poll_timer, client->poll_interval_ms);
btstack_run_loop_add_timer(&client->poll_timer);
}
static void battery_service_client_validate_service(battery_service_client_t * client){
// remove all services without characteristic (array in-place)
uint8_t src_index = 0; // next entry to check
uint8_t dest_index = 0; // to store entry
for (src_index = 0; src_index < client->num_instances; src_index++){
if (client->services[src_index].value_handle != 0){
if (src_index != dest_index) {
client->services[dest_index] = client->services[src_index];
}
dest_index++;
}
}
client->num_instances = dest_index;
}
// @return true if client valid / run function should be called
static bool battery_service_client_handle_query_complete(battery_service_client_t * client, uint8_t status){
switch (client->state){
case BATTERY_SERVICE_CLIENT_STATE_W4_SERVICE_RESULT:
if (status != ATT_ERROR_SUCCESS){
battery_service_emit_connection_established(client, status);
battery_service_finalize_client(client);
return false;
}
if (client->num_instances == 0){
battery_service_emit_connection_established(client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE);
battery_service_finalize_client(client);
return false;
}
client->service_index = 0;
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTICS;
break;
case BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_RESULT:
if (status != ATT_ERROR_SUCCESS){
battery_service_emit_connection_established(client, status);
battery_service_finalize_client(client);
return false;
}
// check if there is another service to query
if ((client->service_index + 1) < client->num_instances){
client->service_index++;
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTICS;
break;
}
battery_service_client_validate_service(client);
if (client->num_instances == 0){
battery_service_emit_connection_established(client, ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE);
battery_service_finalize_client(client);
return false;
}
// we are done with querying all services
client->service_index = 0;
#ifdef ENABLE_TESTING_SUPPORT
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTIC_DESCRIPTORS;
#else
// wait for notification registration
// to send connection established event
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION;
#endif
break;
#ifdef ENABLE_TESTING_SUPPORT
case BATTERY_SERVICE_CLIENT_STATE_W4_CHARACTERISTIC_DESCRIPTORS_RESULT:
if ((client->service_index + 1) < client->num_instances){
client->service_index++;
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_CHARACTERISTIC_DESCRIPTORS;
break;
}
client->service_index = 0;
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION;
break;
case BATTERY_SERVICE_CLIENT_W4_CHARACTERISTIC_CONFIGURATION_RESULT:
client->state = BATTERY_SERVICE_CLIENT_STATE_CONNECTED;
battery_service_emit_connection_established(client, ERROR_CODE_SUCCESS);
battery_service_start_polling_if_needed(client);
break;
#endif
case BATTERY_SERVICE_CLIENT_STATE_W4_NOTIFICATION_REGISTERED:
if ((client->service_index + 1) < client->num_instances){
client->service_index++;
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_REGISTER_NOTIFICATION;
break;
}
#ifdef ENABLE_TESTING_SUPPORT
for (client->service_index = 0; client->service_index < client->num_instances; client->service_index++){
bool need_polling = (client->poll_bitmap & (1 << client->service_index)) != 0;
printf("read CCC 1 0x%02x, polling %d \n", client->services[client->service_index].ccc_handle, (int) need_polling);
if ( (client->services[client->service_index].ccc_handle != 0) && !need_polling ) {
client->state = BATTERY_SERVICE_CLIENT_W2_READ_CHARACTERISTIC_CONFIGURATION;
break;
}
}
#endif
client->state = BATTERY_SERVICE_CLIENT_STATE_CONNECTED;
battery_service_emit_connection_established(client, ERROR_CODE_SUCCESS);
battery_service_start_polling_if_needed(client);
break;
case BATTERY_SERVICE_CLIENT_STATE_CONNECTED:
if (client->polled_service_index != BATTERY_SERVICE_INVALID_INDEX){
if (status != ATT_ERROR_SUCCESS){
battery_service_emit_battery_level(client, client->services[client->polled_service_index].value_handle, status, 0);
}
client->polled_service_index = BATTERY_SERVICE_INVALID_INDEX;
}
break;
default:
break;
}
return true;
}
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);
battery_service_client_t * client = NULL;
gatt_client_service_t service;
gatt_client_characteristic_t characteristic;
bool call_run = true;
switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_SERVICE_QUERY_RESULT:
client = battery_service_get_client_for_con_handle(gatt_event_service_query_result_get_handle(packet));
btstack_assert(client != NULL);
if (client->num_instances < MAX_NUM_BATTERY_SERVICES){
gatt_event_service_query_result_get_service(packet, &service);
client->services[client->num_instances].start_handle = service.start_group_handle;
client->services[client->num_instances].end_handle = service.end_group_handle;
#ifdef ENABLE_TESTING_SUPPORT
printf("Battery Service: start handle 0x%04X, end handle 0x%04X\n", client->services[client->num_instances].start_handle, client->services[client->num_instances].end_handle);
#endif
client->num_instances++;
} else {
log_info("Found more then %d, Battery Service instances. Increase MAX_NUM_BATTERY_SERVICES to store all.", MAX_NUM_BATTERY_SERVICES);
}
break;
case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT:
client = battery_service_get_client_for_con_handle(gatt_event_characteristic_query_result_get_handle(packet));
btstack_assert(client != NULL);
gatt_event_characteristic_query_result_get_characteristic(packet, &characteristic);
btstack_assert(client->service_index < client->num_instances);
btstack_assert(characteristic.uuid16 == ORG_BLUETOOTH_CHARACTERISTIC_BATTERY_LEVEL);
client->services[client->service_index].value_handle = characteristic.value_handle;
client->services[client->service_index].properties = characteristic.properties;
#ifdef ENABLE_TESTING_SUPPORT
printf("Battery Level Characteristic:\n Attribute Handle 0x%04X, Properties 0x%02X, Handle 0x%04X, UUID 0x%04X, service %d\n",
// hid_characteristic_name(characteristic.uuid16),
characteristic.start_handle,
characteristic.properties,
characteristic.value_handle, characteristic.uuid16,
client->service_index);
#endif
break;
case GATT_EVENT_NOTIFICATION:
if (gatt_event_notification_get_value_length(packet) != 1) break;
client = battery_service_get_client_for_con_handle(gatt_event_notification_get_handle(packet));
btstack_assert(client != NULL);
battery_service_emit_battery_level(client,
gatt_event_notification_get_value_handle(packet),
ATT_ERROR_SUCCESS,
gatt_event_notification_get_value(packet)[0]);
break;
case GATT_EVENT_CHARACTERISTIC_VALUE_QUERY_RESULT:
client = battery_service_get_client_for_con_handle(gatt_event_characteristic_value_query_result_get_handle(packet));
btstack_assert(client != NULL);
#ifdef ENABLE_TESTING_SUPPORT
if (client->state == BATTERY_SERVICE_CLIENT_W4_CHARACTERISTIC_CONFIGURATION_RESULT){
printf(" Received CCC value: ");
printf_hexdump(gatt_event_characteristic_value_query_result_get_value(packet), gatt_event_characteristic_value_query_result_get_value_length(packet));
break;
}
#endif
if (gatt_event_characteristic_value_query_result_get_value_length(packet) != 1) break;
battery_service_emit_battery_level(client,
gatt_event_characteristic_value_query_result_get_value_handle(packet),
ATT_ERROR_SUCCESS,
gatt_event_characteristic_value_query_result_get_value(packet)[0]);
break;
#ifdef ENABLE_TESTING_SUPPORT
case GATT_EVENT_ALL_CHARACTERISTIC_DESCRIPTORS_QUERY_RESULT:{
gatt_client_characteristic_descriptor_t characteristic_descriptor;
client = battery_service_get_client_for_con_handle(gatt_event_all_characteristic_descriptors_query_result_get_handle(packet));
btstack_assert(client != NULL);
gatt_event_all_characteristic_descriptors_query_result_get_characteristic_descriptor(packet, &characteristic_descriptor);
if (characteristic_descriptor.uuid16 == ORG_BLUETOOTH_DESCRIPTOR_GATT_CLIENT_CHARACTERISTIC_CONFIGURATION){
client->services[client->service_index].ccc_handle = characteristic_descriptor.handle;
printf(" Battery Level Client Characteristic Configuration Descriptor[%d]: Handle 0x%04X, UUID 0x%04X\n",
client->service_index,
characteristic_descriptor.handle,
characteristic_descriptor.uuid16);
}
break;
}
#endif
case GATT_EVENT_QUERY_COMPLETE:
client = battery_service_get_client_for_con_handle(gatt_event_query_complete_get_handle(packet));
btstack_assert(client != NULL);
call_run = battery_service_client_handle_query_complete(client, gatt_event_query_complete_get_att_status(packet));
break;
default:
break;
}
if (call_run && (client != NULL)){
battery_service_run_for_client(client);
}
}
static void handle_hci_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(packet_type); // ok: only hci events
UNUSED(channel); // ok: there is no channel
UNUSED(size); // ok: fixed format events read from HCI buffer
hci_con_handle_t con_handle;
battery_service_client_t * client;
switch (hci_event_packet_get_type(packet)) {
case HCI_EVENT_DISCONNECTION_COMPLETE:
con_handle = hci_event_disconnection_complete_get_connection_handle(packet);
client = battery_service_get_client_for_con_handle(con_handle);
if (client != NULL){
// finalize
uint16_t cid = client->cid;
battery_service_finalize_client(client);
// TODO: emit disconnected event
UNUSED(cid);
}
break;
default:
break;
}
}
uint8_t battery_service_client_connect(hci_con_handle_t con_handle, btstack_packet_handler_t packet_handler, uint32_t poll_interval_ms, uint16_t * battery_service_cid){
btstack_assert(packet_handler != NULL);
battery_service_client_t * client = battery_service_get_client_for_con_handle(con_handle);
if (client != NULL){
return ERROR_CODE_COMMAND_DISALLOWED;
}
uint16_t cid = battery_service_get_next_cid();
if (battery_service_cid != NULL) {
*battery_service_cid = cid;
}
client = battery_service_create_client(con_handle, cid);
if (client == NULL) {
return BTSTACK_MEMORY_ALLOC_FAILED;
}
client->client_handler = packet_handler;
client->poll_interval_ms = poll_interval_ms;
client->state = BATTERY_SERVICE_CLIENT_STATE_W2_QUERY_SERVICE;
battery_service_run_for_client(client);
return ERROR_CODE_SUCCESS;
}
uint8_t battery_service_client_disconnect(uint16_t battery_service_cid){
battery_service_client_t * client = battery_service_get_client_for_cid(battery_service_cid);
if (client == NULL){
return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
}
// finalize connections
battery_service_finalize_client(client);
return ERROR_CODE_SUCCESS;
}
uint8_t battery_service_client_read_battery_level(uint16_t battery_service_cid, uint8_t service_index){
battery_service_client_t * client = battery_service_get_client_for_cid(battery_service_cid);
if (client == NULL) {
return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
}
if (client->state != BATTERY_SERVICE_CLIENT_STATE_CONNECTED) {
return GATT_CLIENT_IN_WRONG_STATE;
}
if (service_index >= client->num_instances) {
return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE;
}
client->need_poll_bitmap |= (1u << service_index);
battery_service_run_for_client(client);
return ERROR_CODE_SUCCESS;
}
void battery_service_client_init(void){
hci_event_callback_registration.callback = &handle_hci_event;
hci_add_event_handler(&hci_event_callback_registration);
}
void battery_service_client_deinit(void){
battery_service_cid_counter = 0;
clients = NULL;
}
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