553 lines
20 KiB
C
553 lines
20 KiB
C
/**
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* Copyright (c) 2016 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "sdk_common.h"
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#if NRF_MODULE_ENABLED(NRF_BLE_GATT)
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#include "nrf_ble_gatt.h"
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#define NRF_LOG_MODULE_NAME nrf_ble_gatt
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#include "nrf_log.h"
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NRF_LOG_MODULE_REGISTER();
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#include "nrf_strerror.h"
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#define BLE_GAP_DATA_LENGTH_DEFAULT 27 //!< The stack's default data length.
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#define BLE_GAP_DATA_LENGTH_MAX 251 //!< Maximum data length.
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STATIC_ASSERT(NRF_SDH_BLE_GAP_DATA_LENGTH < 252);
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/**@brief Initialize a link's parameters to defaults. */
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static void link_init(nrf_ble_gatt_link_t * p_link)
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{
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p_link->att_mtu_desired = NRF_SDH_BLE_GATT_MAX_MTU_SIZE;
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p_link->att_mtu_effective = BLE_GATT_ATT_MTU_DEFAULT;
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p_link->att_mtu_exchange_pending = false;
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p_link->att_mtu_exchange_requested = false;
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#if !defined (S112) && !defined(S312) && !defined (S122)
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p_link->data_length_desired = NRF_SDH_BLE_GAP_DATA_LENGTH;
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p_link->data_length_effective = BLE_GAP_DATA_LENGTH_DEFAULT;
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#endif // !defined (S112) && !defined(S312) && !defined (S122)
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}
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/**@brief Start a data length update request procedure on a given connection. */
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#if !defined (S112) && !defined(S312) && !defined(S122)
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static ret_code_t data_length_update(uint16_t conn_handle, uint16_t data_length)
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{
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NRF_LOG_DEBUG("Updating data length to %u on connection 0x%x.",
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data_length, conn_handle);
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ble_gap_data_length_params_t const dlp =
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{
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.max_rx_octets = data_length,
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.max_tx_octets = data_length,
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.max_rx_time_us = BLE_GAP_DATA_LENGTH_AUTO,
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.max_tx_time_us = BLE_GAP_DATA_LENGTH_AUTO,
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};
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ble_gap_data_length_limitation_t dll = {0};
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ret_code_t err_code = sd_ble_gap_data_length_update(conn_handle, &dlp, &dll);
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if (err_code != NRF_SUCCESS)
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{
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NRF_LOG_ERROR("sd_ble_gap_data_length_update() (request) on connection 0x%x returned %s.",
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conn_handle, nrf_strerror_get(err_code));
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if ( (dll.tx_payload_limited_octets != 0)
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|| (dll.rx_payload_limited_octets != 0))
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{
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NRF_LOG_ERROR("The requested TX/RX packet length is too long by %u/%u octets.",
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dll.tx_payload_limited_octets, dll.rx_payload_limited_octets);
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}
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if (dll.tx_rx_time_limited_us != 0)
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{
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NRF_LOG_ERROR("The requested combination of TX and RX packet lengths "
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"is too long by %u microseconds.",
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dll.tx_rx_time_limited_us);
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}
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}
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return err_code;
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}
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#endif // !defined (S112) && !defined(S312) && !defined (S122)
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/**@brief Handle a connected event.
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*
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* Begins an ATT MTU exchange procedure, followed by a data length update request as necessary.
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*
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* @param[in] p_gatt GATT structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_connected_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t const * p_ble_evt)
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{
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ret_code_t err_code;
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uint16_t conn_handle = p_ble_evt->evt.common_evt.conn_handle;
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nrf_ble_gatt_link_t * p_link = &p_gatt->links[conn_handle];
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// Update the link desired settings to reflect the current global settings.
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#if !defined (S112) && !defined(S312) && !defined(S122)
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p_link->data_length_desired = p_gatt->data_length;
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#endif // !defined (S112) && !defined(S312) && !defined (S122)
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switch (p_ble_evt->evt.gap_evt.params.connected.role)
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{
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#if !defined (S122)
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case BLE_GAP_ROLE_PERIPH:
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p_link->att_mtu_desired = p_gatt->att_mtu_desired_periph;
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break;
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#endif // !defined (S122)
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#if !defined (S112) && !defined(S312) && !defined(S113)
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case BLE_GAP_ROLE_CENTRAL:
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p_link->att_mtu_desired = p_gatt->att_mtu_desired_central;
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break;
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#endif // !defined (S112) && !defined(S312) && !defined(S113)
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default:
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// Ignore.
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break;
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}
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// Begin an ATT MTU exchange if necessary.
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if (p_link->att_mtu_desired > p_link->att_mtu_effective)
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{
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NRF_LOG_DEBUG("Requesting to update ATT MTU to %u bytes on connection 0x%x.",
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p_link->att_mtu_desired, conn_handle);
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err_code = sd_ble_gattc_exchange_mtu_request(conn_handle, p_link->att_mtu_desired);
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if (err_code == NRF_SUCCESS)
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{
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p_link->att_mtu_exchange_requested = true;
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}
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else if (err_code == NRF_ERROR_BUSY)
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{
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p_link->att_mtu_exchange_pending = true;
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NRF_LOG_DEBUG("sd_ble_gattc_exchange_mtu_request()"
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" on connection 0x%x returned busy, will retry.", conn_handle);
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}
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else
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{
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NRF_LOG_ERROR("sd_ble_gattc_exchange_mtu_request() returned %s.",
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nrf_strerror_get(err_code));
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}
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}
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#if !defined (S112) && !defined(S312) && !defined (S122)
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// Send a data length update request if necessary.
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if (p_link->data_length_desired > p_link->data_length_effective)
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{
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(void) data_length_update(conn_handle, p_link->data_length_desired);
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}
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#endif // !defined (S112) && !defined(S312) && !defined (S122)
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}
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static void on_disconnected_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t const * p_ble_evt)
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{
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// Reset connection parameters.
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link_init(&p_gatt->links[p_ble_evt->evt.gap_evt.conn_handle]);
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}
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/**@brief Handle a BLE_GATTC_EVT_EXCHANGE_MTU_RSP event.
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*
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* @details The effective ATT MTU is set to the lowest between what we requested and the peer's
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* response. This events concludes the ATT MTU exchange. An event is sent to the user
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* and a data length update procedure is started if necessary.
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*
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* @param[in] p_gatt GATT structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_exchange_mtu_rsp_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t const * p_ble_evt)
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{
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uint16_t conn_handle = p_ble_evt->evt.gattc_evt.conn_handle;
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uint16_t server_rx_mtu = p_ble_evt->evt.gattc_evt.params.exchange_mtu_rsp.server_rx_mtu;
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nrf_ble_gatt_link_t * p_link = &p_gatt->links[conn_handle];
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// Determine the lowest MTU between our own desired MTU and the peer's.
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// The MTU may not be less than BLE_GATT_ATT_MTU_DEFAULT.
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p_link->att_mtu_effective = MIN(server_rx_mtu, p_link->att_mtu_desired);
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p_link->att_mtu_effective = MAX(p_link->att_mtu_effective, BLE_GATT_ATT_MTU_DEFAULT);
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NRF_LOG_DEBUG("ATT MTU updated to %u bytes on connection 0x%x (response).",
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p_link->att_mtu_effective, conn_handle);
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// Trigger an event indicating that the ATT MTU size has changed.
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// Send an event to the application only if an ATT MTU exchange was requested.
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if ((p_gatt->evt_handler != NULL) && (p_link->att_mtu_exchange_requested))
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{
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nrf_ble_gatt_evt_t const evt =
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{
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.evt_id = NRF_BLE_GATT_EVT_ATT_MTU_UPDATED,
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.conn_handle = conn_handle,
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.params.att_mtu_effective = p_link->att_mtu_effective,
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};
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p_gatt->evt_handler(p_gatt, &evt);
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}
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p_link->att_mtu_exchange_requested = false;
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p_link->att_mtu_exchange_pending = false;
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}
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/**@brief Handle a BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST event.
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*
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* @param[in] p_gatt GATT structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_exchange_mtu_request_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t const * p_ble_evt)
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{
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ret_code_t err_code;
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uint16_t conn_handle = p_ble_evt->evt.gatts_evt.conn_handle;
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uint16_t client_mtu = p_ble_evt->evt.gatts_evt.params.exchange_mtu_request.client_rx_mtu;
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nrf_ble_gatt_link_t * p_link = &p_gatt->links[conn_handle];
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NRF_LOG_DEBUG("Peer on connection 0x%x requested an ATT MTU of %u bytes.",
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conn_handle, client_mtu);
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client_mtu = MAX(client_mtu, BLE_GATT_ATT_MTU_DEFAULT);
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p_link->att_mtu_effective = MIN(client_mtu, p_link->att_mtu_desired);
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p_link->att_mtu_exchange_pending = false;
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NRF_LOG_DEBUG("Updating ATT MTU to %u bytes (desired: %u) on connection 0x%x.",
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p_link->att_mtu_effective, p_link->att_mtu_desired, conn_handle);
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err_code = sd_ble_gatts_exchange_mtu_reply(conn_handle, p_link->att_mtu_desired);
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if (err_code != NRF_SUCCESS)
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{
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NRF_LOG_ERROR("sd_ble_gatts_exchange_mtu_reply() returned %s.", nrf_strerror_get(err_code));
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}
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// If an ATT_MTU exchange was requested to the peer, defer sending
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// the data length update request and the event to the application until
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// the response for that request is received.
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if (p_link->att_mtu_exchange_requested)
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{
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return;
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}
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// The ATT MTU exchange has finished. Send an event to the application.
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if (p_gatt->evt_handler != NULL)
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{
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nrf_ble_gatt_evt_t const evt =
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{
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.evt_id = NRF_BLE_GATT_EVT_ATT_MTU_UPDATED,
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.conn_handle = conn_handle,
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.params.att_mtu_effective = p_link->att_mtu_effective,
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};
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p_gatt->evt_handler(p_gatt, &evt);
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}
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}
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/**@brief Handle a BLE_GAP_EVT_DATA_LENGTH_UPDATE event.
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*
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* @details Update the connection data length and send an event to the user.
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*
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* @param[in] p_gatt GATT structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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#if !defined (S112) && !defined(S312) && !defined (S122)
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static void on_data_length_update_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t const * p_ble_evt)
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{
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ble_gap_evt_t const gap_evt = p_ble_evt->evt.gap_evt;
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uint16_t const conn_handle = gap_evt.conn_handle;
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// Update the connection data length.
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// The SoftDevice only supports symmetric RX/TX data length settings.
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p_gatt->links[conn_handle].data_length_effective =
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gap_evt.params.data_length_update.effective_params.max_tx_octets;
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NRF_LOG_DEBUG("Data length updated to %u on connection 0x%0x.",
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p_gatt->links[conn_handle].data_length_effective,
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conn_handle);
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NRF_LOG_DEBUG("max_rx_octets: %u",
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gap_evt.params.data_length_update.effective_params.max_rx_octets);
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NRF_LOG_DEBUG("max_tx_octets: %u",
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gap_evt.params.data_length_update.effective_params.max_tx_octets);
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NRF_LOG_DEBUG("max_rx_time: %u",
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gap_evt.params.data_length_update.effective_params.max_rx_time_us);
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NRF_LOG_DEBUG("max_tx_time: %u",
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gap_evt.params.data_length_update.effective_params.max_tx_time_us);
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if (p_gatt->evt_handler != NULL)
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{
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nrf_ble_gatt_evt_t const evt =
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{
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.evt_id = NRF_BLE_GATT_EVT_DATA_LENGTH_UPDATED,
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.conn_handle = conn_handle,
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.params.data_length = p_gatt->links[conn_handle].data_length_effective,
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};
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p_gatt->evt_handler(p_gatt, &evt);
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}
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}
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/**@brief Handle a BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST event.
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*
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*@details Reply with a sd_ble_gap_data_length_update() call, using the minimum between the
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* link's preferred data length, and what requested by the peer.
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* The link preferred data length is set to the global preferred data length
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* upon connection and can be overridden by calling nrf_ble_gatt_data_length_set().
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* The default is NRF_SDH_BLE_GAP_DATA_LENGTH.
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*
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*@note The SoftDevice will not send any BLE_GAP_EVT_DATA_LENGTH_UPDATE events on this side.
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* Therefore, the connection data length is updated immediately and an event is sent
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* to the user.
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*
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* @param[in] p_gatt GATT structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_data_length_update_request_evt(nrf_ble_gatt_t * p_gatt, ble_evt_t const * p_ble_evt)
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{
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ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt;
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nrf_ble_gatt_link_t * p_link = &p_gatt->links[p_gap_evt->conn_handle];
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// The SoftDevice only supports symmetric RX/TX data length settings.
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uint8_t const data_length_requested =
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p_gap_evt->params.data_length_update_request.peer_params.max_tx_octets;
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NRF_LOG_DEBUG("Peer on connection 0x%x requested a data length of %u bytes.",
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p_gap_evt->conn_handle, data_length_requested);
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uint8_t const data_length_effective = MIN(p_link->data_length_desired, data_length_requested);
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(void) data_length_update(p_gap_evt->conn_handle, data_length_effective);
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}
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#endif // !defined (S112) && !defined(S312) && !defined (S122)
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ret_code_t nrf_ble_gatt_init(nrf_ble_gatt_t * p_gatt, nrf_ble_gatt_evt_handler_t evt_handler)
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{
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VERIFY_PARAM_NOT_NULL(p_gatt);
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p_gatt->evt_handler = evt_handler;
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p_gatt->att_mtu_desired_periph = NRF_SDH_BLE_GATT_MAX_MTU_SIZE;
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p_gatt->att_mtu_desired_central = NRF_SDH_BLE_GATT_MAX_MTU_SIZE;
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p_gatt->data_length = NRF_SDH_BLE_GAP_DATA_LENGTH;
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for (uint32_t i = 0; i < NRF_BLE_GATT_LINK_COUNT; i++)
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{
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link_init(&p_gatt->links[i]);
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}
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return NRF_SUCCESS;
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}
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ret_code_t nrf_ble_gatt_att_mtu_periph_set(nrf_ble_gatt_t * p_gatt, uint16_t desired_mtu)
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{
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VERIFY_PARAM_NOT_NULL(p_gatt);
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if ((desired_mtu < BLE_GATT_ATT_MTU_DEFAULT) || (desired_mtu > NRF_SDH_BLE_GATT_MAX_MTU_SIZE))
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{
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return NRF_ERROR_INVALID_PARAM;
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}
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p_gatt->att_mtu_desired_periph = desired_mtu;
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return NRF_SUCCESS;
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}
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ret_code_t nrf_ble_gatt_att_mtu_central_set(nrf_ble_gatt_t * p_gatt, uint16_t desired_mtu)
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{
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VERIFY_PARAM_NOT_NULL(p_gatt);
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if ((desired_mtu < BLE_GATT_ATT_MTU_DEFAULT) || (desired_mtu > NRF_SDH_BLE_GATT_MAX_MTU_SIZE))
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{
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return NRF_ERROR_INVALID_PARAM;
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}
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p_gatt->att_mtu_desired_central = desired_mtu;
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return NRF_SUCCESS;
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}
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uint16_t nrf_ble_gatt_eff_mtu_get(nrf_ble_gatt_t const * p_gatt, uint16_t conn_handle)
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{
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if ((p_gatt == NULL) || (conn_handle >= NRF_BLE_GATT_LINK_COUNT))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
return p_gatt->links[conn_handle].att_mtu_effective;
|
|
}
|
|
|
|
#if !defined (S112) && !defined(S312) && !defined (S122)
|
|
ret_code_t nrf_ble_gatt_data_length_set(nrf_ble_gatt_t * p_gatt,
|
|
uint16_t conn_handle,
|
|
uint8_t data_length)
|
|
{
|
|
if (p_gatt == NULL)
|
|
{
|
|
return NRF_ERROR_NULL;
|
|
}
|
|
|
|
// Check early to avoid requesting an invalid data length for upcoming connections.
|
|
if ( (data_length > BLE_GAP_DATA_LENGTH_MAX)
|
|
|| (data_length < BLE_GAP_DATA_LENGTH_DEFAULT))
|
|
{
|
|
return NRF_ERROR_INVALID_PARAM;
|
|
}
|
|
|
|
if (conn_handle == BLE_CONN_HANDLE_INVALID)
|
|
{
|
|
// Save value and request upon connection.
|
|
p_gatt->data_length = data_length;
|
|
return NRF_SUCCESS;
|
|
}
|
|
|
|
if (conn_handle >= NRF_BLE_GATT_LINK_COUNT)
|
|
{
|
|
return NRF_ERROR_INVALID_PARAM;
|
|
}
|
|
|
|
// Request data length on existing link.
|
|
p_gatt->links[conn_handle].data_length_desired = data_length;
|
|
|
|
return data_length_update(conn_handle, data_length);
|
|
}
|
|
|
|
|
|
ret_code_t nrf_ble_gatt_data_length_get(nrf_ble_gatt_t const * p_gatt,
|
|
uint16_t conn_handle,
|
|
uint8_t * p_data_length)
|
|
{
|
|
if ((p_gatt == NULL) || (p_data_length == NULL))
|
|
{
|
|
return NRF_ERROR_NULL;
|
|
}
|
|
|
|
if (conn_handle == BLE_CONN_HANDLE_INVALID)
|
|
{
|
|
*p_data_length = p_gatt->data_length;
|
|
return NRF_SUCCESS;
|
|
}
|
|
|
|
if (conn_handle >= NRF_BLE_GATT_LINK_COUNT)
|
|
{
|
|
return NRF_ERROR_INVALID_PARAM;
|
|
}
|
|
|
|
*p_data_length = p_gatt->links[conn_handle].data_length_effective;
|
|
return NRF_SUCCESS;
|
|
}
|
|
#endif // !defined (S112) && !defined(S312) && !defined(S122)
|
|
|
|
|
|
void nrf_ble_gatt_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
|
|
{
|
|
nrf_ble_gatt_t * p_gatt = (nrf_ble_gatt_t *)p_context;
|
|
uint16_t conn_handle = p_ble_evt->evt.common_evt.conn_handle;
|
|
|
|
if (conn_handle >= NRF_BLE_GATT_LINK_COUNT)
|
|
{
|
|
return;
|
|
}
|
|
|
|
switch (p_ble_evt->header.evt_id)
|
|
{
|
|
case BLE_GAP_EVT_CONNECTED:
|
|
on_connected_evt(p_gatt, p_ble_evt);
|
|
break;
|
|
|
|
case BLE_GAP_EVT_DISCONNECTED:
|
|
on_disconnected_evt(p_gatt, p_ble_evt);
|
|
break;
|
|
|
|
case BLE_GATTC_EVT_EXCHANGE_MTU_RSP:
|
|
on_exchange_mtu_rsp_evt(p_gatt, p_ble_evt);
|
|
break;
|
|
|
|
case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
|
|
on_exchange_mtu_request_evt(p_gatt, p_ble_evt);
|
|
break;
|
|
|
|
#if !defined (S112) && !defined(S312) && !defined (S122)
|
|
case BLE_GAP_EVT_DATA_LENGTH_UPDATE:
|
|
on_data_length_update_evt(p_gatt, p_ble_evt);
|
|
break;
|
|
|
|
case BLE_GAP_EVT_DATA_LENGTH_UPDATE_REQUEST:
|
|
on_data_length_update_request_evt(p_gatt, p_ble_evt);
|
|
break;
|
|
#endif // !defined (S112) && !defined(S312) && !defined (S122)
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (p_gatt->links[conn_handle].att_mtu_exchange_pending)
|
|
{
|
|
ret_code_t err_code;
|
|
|
|
err_code = sd_ble_gattc_exchange_mtu_request(conn_handle,
|
|
p_gatt->links[conn_handle].att_mtu_desired);
|
|
|
|
if (err_code == NRF_SUCCESS)
|
|
{
|
|
p_gatt->links[conn_handle].att_mtu_exchange_pending = false;
|
|
p_gatt->links[conn_handle].att_mtu_exchange_requested = true;
|
|
|
|
NRF_LOG_DEBUG("Requesting to update ATT MTU to %u bytes on connection 0x%x (retry).",
|
|
p_gatt->links[conn_handle].att_mtu_desired, conn_handle);
|
|
}
|
|
else if (err_code != NRF_ERROR_BUSY)
|
|
{
|
|
NRF_LOG_ERROR("sd_ble_gattc_exchange_mtu_request() returned %s.",
|
|
nrf_strerror_get(err_code));
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif //NRF_BLE_GATT_ENABLED
|