static void att_run_for_context(att_server_t * att_server){
switch (att_server->state){
case ATT_SERVER_REQUEST_RECEIVED:
// wait until pairing is complete
if (att_server->pairing_active) break;
#ifdef ENABLE_LE_SIGNED_WRITE
if (att_server->request_buffer[0] == ATT_SIGNED_WRITE_COMMAND){
log_info("ATT Signed Write!");
if (!sm_cmac_ready()) {
log_info("ATT Signed Write, sm_cmac engine not ready. Abort");
att_server->state = ATT_SERVER_IDLE;
return;
}
if (att_server->request_size < (3 + 12)) {
log_info("ATT Signed Write, request to short. Abort.");
att_server->state = ATT_SERVER_IDLE;
return;
}
if (att_server->ir_lookup_active){
return;
}
if (att_server->ir_le_device_db_index < 0){
log_info("ATT Signed Write, CSRK not available");
att_server->state = ATT_SERVER_IDLE;
return;
}
// check counter
uint32_t counter_packet = little_endian_read_32(att_server->request_buffer, att_server->request_size-12);
uint32_t counter_db = le_device_db_remote_counter_get(att_server->ir_le_device_db_index);
log_info("ATT Signed Write, DB counter %"PRIu32", packet counter %"PRIu32, counter_db, counter_packet);
if (counter_packet < counter_db){
log_info("ATT Signed Write, db reports higher counter, abort");
att_server->state = ATT_SERVER_IDLE;
return;
}
// signature is { sequence counter, secure hash }
sm_key_t csrk;
le_device_db_remote_csrk_get(att_server->ir_le_device_db_index, csrk);
att_server->state = ATT_SERVER_W4_SIGNED_WRITE_VALIDATION;
log_info("Orig Signature: ");
log_info_hexdump( &att_server->request_buffer[att_server->request_size-8], 8);
uint16_t attribute_handle = little_endian_read_16(att_server->request_buffer, 1);
sm_cmac_signed_write_start(csrk, att_server->request_buffer[0], attribute_handle, att_server->request_size - 15, &att_server->request_buffer[3], counter_packet, att_signed_write_handle_cmac_result);
return;
}
#endif
// move on
att_server->state = ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED;
att_dispatch_server_request_can_send_now_event(att_server->connection.con_handle);
break;
default:
break;
}
}
static void handle_hci_event(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(packet_type);
UNUSED(channel);
UNUSED(size);
int connection_encrypted;
// handle connect / disconncet events first
switch (hci_event_packet_get_type(packet)) {
case HCI_EVENT_LE_META:
switch (packet[2]) {
case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
gc_handle = little_endian_read_16(packet, 4);
log_info("Connection handle 0x%04x, request encryption", gc_handle);
// we need to be paired to enable notifications
tc_state = TC_W4_ENCRYPTED_CONNECTION;
sm_send_security_request(gc_handle);
break;
default:
break;
}
return;
case HCI_EVENT_ENCRYPTION_CHANGE:
if (gc_handle != little_endian_read_16(packet, 3)) return;
connection_encrypted = packet[5];
log_info("Encryption state change: %u", connection_encrypted);
if (!connection_encrypted) return;
if (tc_state != TC_W4_ENCRYPTED_CONNECTION) return;
// let's start
log_info("\nANCS Client - CONNECTED, discover ANCS service");
tc_state = TC_W4_SERVICE_RESULT;
gatt_client_discover_primary_services_by_uuid128(handle_hci_event, gc_handle, ancs_service_uuid);
return;
case HCI_EVENT_DISCONNECTION_COMPLETE:
if (hci_event_disconnection_complete_get_connection_handle(packet) != gc_handle) break;
if (tc_state == TC_SUBSCRIBED){
notify_client_simple(ANCS_SUBEVENT_CLIENT_DISCONNECTED);
}
tc_state = TC_IDLE;
gc_handle = 0;
return;
default:
break;
}
gatt_client_characteristic_t characteristic;
uint8_t * value;
uint16_t value_handle;
uint16_t value_length;
switch(tc_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, &ancs_service);
ancs_service_found = 1;
break;
case GATT_EVENT_QUERY_COMPLETE:
if (!ancs_service_found){
log_info("ANCS Service not found");
tc_state = TC_IDLE;
break;
}
tc_state = TC_W4_CHARACTERISTIC_RESULT;
log_info("ANCS Client - Discover characteristics for ANCS SERVICE ");
gatt_client_discover_characteristics_for_service(handle_hci_event, gc_handle, &ancs_service);
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, &characteristic);
if (memcmp(characteristic.uuid128, ancs_notification_source_uuid, 16) == 0){
log_info("ANCS Notification Source found, attribute handle %u", characteristic.value_handle);
ancs_notification_source_characteristic = characteristic;
ancs_characteristcs++;
break;
}
if (memcmp(characteristic.uuid128, ancs_control_point_uuid, 16) == 0){
log_info("ANCS Control Point found, attribute handle %u", characteristic.value_handle);
ancs_control_point_characteristic = characteristic;
ancs_characteristcs++;
break;
}
if (memcmp(characteristic.uuid128, ancs_data_source_uuid, 16) == 0){
log_info("ANCS Data Source found, attribute handle %u", characteristic.value_handle);
ancs_data_source_characteristic = characteristic;
ancs_characteristcs++;
break;
}
break;
case GATT_EVENT_QUERY_COMPLETE:
log_info("ANCS Characteristcs count %u", ancs_characteristcs);
tc_state = TC_W4_NOTIFICATION_SOURCE_SUBSCRIBED;
gatt_client_listen_for_characteristic_value_updates(&ancs_notification_source_notification, &handle_hci_event, gc_handle, &ancs_notification_source_characteristic);
gatt_client_write_client_characteristic_configuration(handle_hci_event, gc_handle, &ancs_notification_source_characteristic,
GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
break;
default:
break;
}
break;
case TC_W4_NOTIFICATION_SOURCE_SUBSCRIBED:
switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_QUERY_COMPLETE:
log_info("ANCS Notification Source subscribed");
tc_state = TC_W4_DATA_SOURCE_SUBSCRIBED;
gatt_client_listen_for_characteristic_value_updates(&ancs_data_source_notification, &handle_hci_event, gc_handle, &ancs_data_source_characteristic);
gatt_client_write_client_characteristic_configuration(handle_hci_event, gc_handle, &ancs_data_source_characteristic,
GATT_CLIENT_CHARACTERISTICS_CONFIGURATION_NOTIFICATION);
break;
default:
break;
}
break;
case TC_W4_DATA_SOURCE_SUBSCRIBED:
switch(hci_event_packet_get_type(packet)){
case GATT_EVENT_QUERY_COMPLETE:
log_info("ANCS Data Source subscribed");
tc_state = TC_SUBSCRIBED;
notify_client_simple(ANCS_SUBEVENT_CLIENT_CONNECTED);
break;
default:
break;
}
break;
case TC_SUBSCRIBED:
if (hci_event_packet_get_type(packet) != GATT_EVENT_NOTIFICATION && hci_event_packet_get_type(packet) != GATT_EVENT_INDICATION ) break;
value_handle = little_endian_read_16(packet, 4);
value_length = little_endian_read_16(packet, 6);
value = &packet[8];
log_info("ANCS Notification, value handle %u", value_handle);
if (value_handle == ancs_data_source_characteristic.value_handle){
int i;
for (i=0;i<value_length;i++) {
ancs_chunk_parser_handle_byte(value[i]);
}
} else if (value_handle == ancs_notification_source_characteristic.value_handle){
ancs_notification_uid = little_endian_read_32(value, 4);
log_info("Notification received: EventID %02x, EventFlags %02x, CategoryID %02x, CategoryCount %u, UID %04x",
value[0], value[1], value[2], value[3], (int) ancs_notification_uid);
static uint8_t get_notification_attributes[] = {0, 0,0,0,0, 0, 1,32,0, 2,32,0, 3,32,0, 4, 5};
little_endian_store_32(get_notification_attributes, 1, ancs_notification_uid);
ancs_notification_uid = 0;
ancs_chunk_parser_init();
gatt_client_write_value_of_characteristic(handle_hci_event, gc_handle, ancs_control_point_characteristic.value_handle,
sizeof(get_notification_attributes), get_notification_attributes);
} else {
log_info("Unknown Source: ");
log_info_hexdump(value , value_length);
}
break;
default:
break;
}
// app_run();
}
