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example/gatt_battery_query: register for notification updates

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This commit is contained in:
Matthias Ringwald 2019-05-24 09:37:45 +02:00
parent 4ce43359e6
commit 26687d1449
1 changed files with 19 additions and 5 deletions
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24
example/gatt_battery_query.c
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@ -89,11 +89,14 @@ static hci_con_handle_t connection_handle;
static uint16_t battery_service_uuid = 0x180F; static uint16_t battery_service_uuid = 0x180F;
static uint16_t battery_level_characteristic_uuid = 0x2a19; static uint16_t battery_level_characteristic_uuid = 0x2a19;
static gatt_client_service_t battery_service; static gatt_client_service_t battery_service;
static gatt_client_characteristic_t config_characteristic; static gatt_client_characteristic_t battery_level_characteristic;
static gc_state_t state = TC_IDLE; static gc_state_t state = TC_IDLE;
static btstack_packet_callback_registration_t hci_event_callback_registration; 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){ static void printUUID(uint8_t * uuid128, uint16_t uuid16){
if (uuid16){ if (uuid16){
printf("%04x",uuid16); printf("%04x",uuid16);
@ -181,8 +184,8 @@ static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint
case TC_W4_CHARACTERISTIC_RESULT: case TC_W4_CHARACTERISTIC_RESULT:
switch(hci_event_packet_get_type(packet)){ switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT: case GATT_EVENT_CHARACTERISTIC_QUERY_RESULT:
gatt_event_characteristic_query_result_get_characteristic(packet, &config_characteristic); gatt_event_characteristic_query_result_get_characteristic(packet, &battery_level_characteristic);
dump_characteristic(&config_characteristic); dump_characteristic(&battery_level_characteristic);
break; break;
case GATT_EVENT_QUERY_COMPLETE: case GATT_EVENT_QUERY_COMPLETE:
if (packet[4] != 0){ if (packet[4] != 0){
@ -191,12 +194,17 @@ static void handle_gatt_client_event(uint8_t packet_type, uint16_t channel, uint
gap_disconnect(connection_handle); gap_disconnect(connection_handle);
break; 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; state = TC_W4_BATTERY_DATA;
printf("\nConfigure battery level characteristic for notify.\n"); printf("\nConfigure battery level characteristic for notify.\n");
status = gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, &config_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION); status = gatt_client_write_client_characteristic_configuration(handle_gatt_client_event, connection_handle, &battery_level_characteristic, GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
if (status != 0){ if (status != 0){
printf("\nNotification not supported. Query value of characteristic.\n"); printf("\nNotification not supported. Query value of characteristic.\n");
gatt_client_read_value_of_characteristic(handle_gatt_client_event, connection_handle, &config_characteristic); gatt_client_read_value_of_characteristic(handle_gatt_client_event, connection_handle, &battery_level_characteristic);
} }
break; break;
@ -294,6 +302,12 @@ static void hci_event_handler(uint8_t packet_type, uint16_t channel, uint8_t *pa
gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, battery_service_uuid); gatt_client_discover_primary_services_by_uuid16(handle_gatt_client_event, connection_handle, battery_service_uuid);
break; break;
case HCI_EVENT_DISCONNECTION_COMPLETE: 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){ if (cmdline_addr_found){
printf("\nDisconnected %s\n", bd_addr_to_str(cmdline_addr)); printf("\nDisconnected %s\n", bd_addr_to_str(cmdline_addr));