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src/ble/gatt-service/nordic_spp_service_server.c
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/*
* Copyright (C) 2018 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__ "nordic_spp_service_server.c"
/**
* Implementation of the Nordic SPP-like profile
*
* To use with your application, add `#import <nordic_spp_service.gatt>` to your .gatt file
* and call all functions below. All strings and blobs need to stay valid after calling the functions.
*/
#include <stdint.h>
#include <string.h>
#include "ble/att_db.h"
#include "ble/att_server.h"
#include "btstack_debug.h"
#include "btstack_event.h"
#include "ble/gatt-service/nordic_spp_service_server.h"
static att_service_handler_t nordic_spp_service;
static btstack_packet_handler_t client_packet_handler;
static btstack_packet_callback_registration_t nordic_spp_service_hci_event_callback_registration;
static uint16_t nordic_spp_rx_value_handle;
static uint16_t nordic_spp_tx_value_handle;
static uint16_t nordic_spp_tx_client_configuration_handle;
static uint16_t nordic_spp_tx_client_configuration_value;
static hci_con_handle_t nordic_spp_con_handle;
static void nordic_spp_service_emit_state(hci_con_handle_t con_handle, bool enabled){
uint8_t event[5];
uint8_t pos = 0;
event[pos++] = HCI_EVENT_GATTSERVICE_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = enabled ? GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED : GATTSERVICE_SUBEVENT_SPP_SERVICE_DISCONNECTED;
little_endian_store_16(event,pos, (uint16_t) con_handle);
pos += 2;
(*client_packet_handler)(HCI_EVENT_PACKET, 0, event, pos);
}
static uint16_t nordic_spp_service_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){
UNUSED(con_handle);
UNUSED(offset);
UNUSED(buffer_size);
if (attribute_handle == nordic_spp_tx_client_configuration_handle){
if (buffer != NULL){
little_endian_store_16(buffer, 0, nordic_spp_tx_client_configuration_value);
}
return 2;
}
return 0;
}
static int nordic_spp_service_write_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){
UNUSED(offset);
UNUSED(buffer_size);
if (transaction_mode != ATT_TRANSACTION_MODE_NONE){
return 0;
}
if (attribute_handle == nordic_spp_rx_value_handle){
(*client_packet_handler)(RFCOMM_DATA_PACKET, (uint16_t) con_handle, buffer, buffer_size);
}
if (attribute_handle == nordic_spp_tx_client_configuration_handle){
nordic_spp_tx_client_configuration_value = little_endian_read_16(buffer, 0);
bool enabled = (nordic_spp_tx_client_configuration_value != 0);
nordic_spp_con_handle = con_handle;
nordic_spp_service_emit_state(con_handle, enabled);
}
return 0;
}
static void nordic_spp_service_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;
hci_con_handle_t con_handle;
switch (hci_event_packet_get_type(packet)){
case HCI_EVENT_DISCONNECTION_COMPLETE:
con_handle = hci_event_disconnection_complete_get_connection_handle(packet);
if (con_handle == nordic_spp_con_handle){
nordic_spp_con_handle = HCI_CON_HANDLE_INVALID;
if (nordic_spp_tx_client_configuration_value > 0){
nordic_spp_tx_client_configuration_value = 0;
nordic_spp_service_emit_state(con_handle, false);
}
}
break;
default:
break;
}
}
/**
* @brief Init Nordic SPP Service Server with ATT DB
* @param callback for tx data from peer
*/
void nordic_spp_service_server_init(btstack_packet_handler_t packet_handler){
static const uint8_t nordic_spp_profile_uuid128[] = { 0x6E, 0x40, 0x00, 0x01, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E };
static const uint8_t nordic_spp_rx_uuid128[] = { 0x6E, 0x40, 0x00, 0x02, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E };
static const uint8_t nordic_spp_tx_uuid128[] = { 0x6E, 0x40, 0x00, 0x03, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E };
client_packet_handler = packet_handler;
// get service handle range
uint16_t start_handle = 0;
uint16_t end_handle = 0xffff;
int service_found = gatt_server_get_handle_range_for_service_with_uuid128(nordic_spp_profile_uuid128, &start_handle, &end_handle);
btstack_assert(service_found != 0);
UNUSED(service_found);
// get characteristic value handle and client configuration handle
nordic_spp_rx_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid128(start_handle, end_handle, nordic_spp_rx_uuid128);
nordic_spp_tx_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid128(start_handle, end_handle, nordic_spp_tx_uuid128);
nordic_spp_tx_client_configuration_handle = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid128(start_handle, end_handle, nordic_spp_tx_uuid128);
log_info("nordic_spp_rx_value_handle 0x%02x", nordic_spp_rx_value_handle);
log_info("nordic_spp_tx_value_handle 0x%02x", nordic_spp_tx_value_handle);
log_info("nordic_spp_tx_client_configuration_handle 0x%02x", nordic_spp_tx_client_configuration_handle);
// register service with ATT Server
nordic_spp_service.start_handle = start_handle;
nordic_spp_service.end_handle = end_handle;
nordic_spp_service.read_callback = &nordic_spp_service_read_callback;
nordic_spp_service.write_callback = &nordic_spp_service_write_callback;
att_server_register_service_handler(&nordic_spp_service);
// register HCI packet handler
nordic_spp_service_hci_event_callback_registration.callback = &nordic_spp_service_hci_event_handler;
hci_add_event_handler(&nordic_spp_service_hci_event_callback_registration);
// reset connection
nordic_spp_con_handle = HCI_CON_HANDLE_INVALID;
}
/**
* @brief Queue send request. When called, one packet can be send via nordic_spp_service_send below
* @param request
* @param con_handle
*/
void nordic_spp_service_server_request_can_send_now(btstack_context_callback_registration_t * request, hci_con_handle_t con_handle){
att_server_request_to_send_notification(request, con_handle);
}
/**
* @brief Send data
* @param con_handle
* @param data
* @param size
*/
int nordic_spp_service_server_send(hci_con_handle_t con_handle, const uint8_t * data, uint16_t size){
return att_server_notify(con_handle, nordic_spp_tx_value_handle, data, size);
}
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