/* * 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 ` to your .gatt file * and call all functions below. All strings and blobs need to stay valid after calling the functions. */ #include #include #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); }