Diff: nRF51822/nordic-sdk/components/ble/ble_services/ble_dfu/ble_dfu.c

Revision:

1:fc2f9d636751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51822/nordic-sdk/components/ble/ble_services/ble_dfu/ble_dfu.c	Wed Apr 22 07:47:17 2015 +0000
@@ -0,0 +1,654 @@
+/* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
+ *
+ * The information contained herein is property of Nordic Semiconductor ASA.
+ * Terms and conditions of usage are described in detail in NORDIC
+ * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
+ *
+ * Licensees are granted free, non-transferable use of the information. NO
+ * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
+ * the file.
+ *
+ */
+
+#include "ble_dfu.h"
+#include "nrf_error.h"
+#include "ble_types.h"
+#include "ble_gatts.h"
+#include "app_util.h"
+#include "ble_srv_common.h"
+#include "nordic_common.h"
+#include <stdint.h>
+#include <string.h>
+#include <stddef.h>
+
+#define MAX_DFU_PKT_LEN         20                                              /**< Maximum length (in bytes) of the DFU Packet characteristic. */
+#define PKT_START_DFU_PARAM_LEN 2                                               /**< Length (in bytes) of the parameters for Packet Start DFU Request. */
+#define PKT_INIT_DFU_PARAM_LEN  2                                               /**< Length (in bytes) of the parameters for Packet Init DFU Request. */
+#define PKT_RCPT_NOTIF_REQ_LEN  3                                               /**< Length (in bytes) of the Packet Receipt Notification Request. */
+#define MAX_PKTS_RCPT_NOTIF_LEN 6                                               /**< Maximum length (in bytes) of the Packets Receipt Notification. */
+#define MAX_RESPONSE_LEN        7                                               /**< Maximum length (in bytes) of the response to a Control Point command. */
+#define MAX_NOTIF_BUFFER_LEN    MAX(MAX_PKTS_RCPT_NOTIF_LEN, MAX_RESPONSE_LEN)  /**< Maximum length (in bytes) of the buffer needed by DFU Service while sending notifications to peer. */
+
+enum
+{
+    OP_CODE_START_DFU          = 1,                                             /**< Value of the Op code field for 'Start DFU' command.*/
+    OP_CODE_RECEIVE_INIT       = 2,                                             /**< Value of the Op code field for 'Initialize DFU parameters' command.*/
+    OP_CODE_RECEIVE_FW         = 3,                                             /**< Value of the Op code field for 'Receive firmware image' command.*/
+    OP_CODE_VALIDATE           = 4,                                             /**< Value of the Op code field for 'Validate firmware' command.*/
+    OP_CODE_ACTIVATE_N_RESET   = 5,                                             /**< Value of the Op code field for 'Activate & Reset' command.*/
+    OP_CODE_SYS_RESET          = 6,                                             /**< Value of the Op code field for 'Reset System' command.*/
+    OP_CODE_IMAGE_SIZE_REQ     = 7,                                             /**< Value of the Op code field for 'Report received image size' command.*/
+    OP_CODE_PKT_RCPT_NOTIF_REQ = 8,                                             /**< Value of the Op code field for 'Request packet receipt notification.*/
+    OP_CODE_RESPONSE           = 16,                                            /**< Value of the Op code field for 'Response.*/
+    OP_CODE_PKT_RCPT_NOTIF     = 17                                             /**< Value of the Op code field for 'Packets Receipt Notification'.*/
+};
+
+static bool     m_is_dfu_service_initialized = false;                           /**< Variable to check if the DFU service was initialized by the application.*/
+static uint8_t  m_notif_buffer[MAX_NOTIF_BUFFER_LEN];                           /**< Buffer used for sending notifications to peer. */
+
+/**@brief       Function for adding DFU Packet characteristic to the BLE Stack.
+ *
+ * @param[in]   p_dfu DFU Service structure.
+ *
+ * @return      NRF_SUCCESS on success. Otherwise an error code.
+ */
+static uint32_t dfu_pkt_char_add(ble_dfu_t * const p_dfu)
+{
+    ble_gatts_char_md_t char_md;
+    ble_gatts_attr_t    attr_char_value;
+    ble_uuid_t          char_uuid;
+    ble_gatts_attr_md_t attr_md;
+
+    memset(&char_md, 0, sizeof(char_md));
+
+    char_md.char_props.write_wo_resp = 1;
+    char_md.p_char_user_desc         = NULL;
+    char_md.p_char_pf                = NULL;
+    char_md.p_user_desc_md           = NULL;
+    char_md.p_cccd_md                = NULL;
+    char_md.p_sccd_md                = NULL;
+
+    char_uuid.type = p_dfu->uuid_type;
+    char_uuid.uuid = BLE_DFU_PKT_CHAR_UUID;
+
+    memset(&attr_md, 0, sizeof(attr_md));
+
+    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.read_perm);
+    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
+
+    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
+    attr_md.rd_auth = 0;
+    attr_md.wr_auth = 0;
+    attr_md.vlen    = 1;
+
+    memset(&attr_char_value, 0, sizeof(attr_char_value));
+
+    attr_char_value.p_uuid    = &char_uuid;
+    attr_char_value.p_attr_md = &attr_md;
+    attr_char_value.init_len  = 0;
+    attr_char_value.init_offs = 0;
+    attr_char_value.max_len   = MAX_DFU_PKT_LEN;
+    attr_char_value.p_value   = NULL;
+
+    return sd_ble_gatts_characteristic_add(p_dfu->service_handle,
+                                           &char_md,
+                                           &attr_char_value,
+                                           &p_dfu->dfu_pkt_handles);
+}
+
+
+/**@brief       Function for adding DFU Revision characteristic to the BLE Stack.
+ *
+ * @param[in]   p_dfu DFU Service structure.
+ *
+ * @return      NRF_SUCCESS on success. Otherwise an error code.
+ */
+static uint32_t dfu_rev_char_add(ble_dfu_t * const p_dfu, ble_dfu_init_t const * const p_dfu_init)
+{
+    ble_gatts_char_md_t char_md;
+    ble_gatts_attr_t    attr_char_value;
+    ble_uuid_t          char_uuid;
+    ble_gatts_attr_md_t attr_md;
+
+    memset(&char_md, 0, sizeof(char_md));
+
+    char_md.char_props.read          = 1;
+    char_md.p_char_user_desc         = NULL;
+    char_md.p_char_pf                = NULL;
+    char_md.p_user_desc_md           = NULL;
+    char_md.p_cccd_md                = NULL;
+    char_md.p_sccd_md                = NULL;
+
+    char_uuid.type = p_dfu->uuid_type;
+    char_uuid.uuid = BLE_DFU_REV_CHAR_UUID;
+
+    memset(&attr_md, 0, sizeof(attr_md));
+
+    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
+    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.write_perm);
+
+    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
+    attr_md.rd_auth = 0;
+    attr_md.wr_auth = 0;
+    attr_md.vlen    = 1;
+
+    memset(&attr_char_value, 0, sizeof(attr_char_value));
+
+    attr_char_value.p_uuid    = &char_uuid;
+    attr_char_value.p_attr_md = &attr_md;
+    attr_char_value.init_len  = sizeof(uint16_t);
+    attr_char_value.init_offs = 0;
+    attr_char_value.max_len   = sizeof(uint16_t);
+    attr_char_value.p_value   = (uint8_t *)&p_dfu_init->revision;
+
+    return sd_ble_gatts_characteristic_add(p_dfu->service_handle,
+                                           &char_md,
+                                           &attr_char_value,
+                                           &p_dfu->dfu_rev_handles);
+}
+
+
+/**@brief       Function for adding DFU Control Point characteristic to the BLE Stack.
+ *
+ * @param[in]   p_dfu DFU Service structure.
+ *
+ * @return      NRF_SUCCESS on success. Otherwise an error code.
+ */
+static uint32_t dfu_ctrl_pt_add(ble_dfu_t * const p_dfu)
+{
+    ble_gatts_char_md_t char_md;
+    ble_gatts_attr_t    attr_char_value;
+    ble_uuid_t          char_uuid;
+    ble_gatts_attr_md_t attr_md;
+
+    memset(&char_md, 0, sizeof(char_md));
+
+    char_md.char_props.write  = 1;
+    char_md.char_props.notify = 1;
+    char_md.p_char_user_desc  = NULL;
+    char_md.p_char_pf         = NULL;
+    char_md.p_user_desc_md    = NULL;
+    char_md.p_cccd_md         = NULL;
+    char_md.p_sccd_md         = NULL;
+
+    char_uuid.type = p_dfu->uuid_type;
+    char_uuid.uuid = BLE_DFU_CTRL_PT_UUID;
+
+    memset(&attr_md, 0, sizeof(attr_md));
+
+    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&attr_md.read_perm);
+    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
+
+    attr_md.vloc    = BLE_GATTS_VLOC_STACK;
+    attr_md.rd_auth = 0;
+    attr_md.wr_auth = 1;
+    attr_md.vlen    = 1;
+
+    memset(&attr_char_value, 0, sizeof(attr_char_value));
+
+    attr_char_value.p_uuid    = &char_uuid;
+    attr_char_value.p_attr_md = &attr_md;
+    attr_char_value.init_len  = 0;
+    attr_char_value.init_offs = 0;
+    attr_char_value.max_len   = BLE_L2CAP_MTU_DEF;
+    attr_char_value.p_value   = NULL;
+
+    return sd_ble_gatts_characteristic_add(p_dfu->service_handle,
+                                           &char_md,
+                                           &attr_char_value,
+                                           &p_dfu->dfu_ctrl_pt_handles);
+}
+
+
+/**@brief     Function for handling the @ref BLE_GAP_EVT_CONNECTED event from the S110 SoftDevice.
+ *
+ * @param[in] p_dfu     DFU Service Structure.
+ * @param[in] p_ble_evt Pointer to the event received from BLE stack.
+ */
+static void on_connect(ble_dfu_t * p_dfu, ble_evt_t * p_ble_evt)
+{
+    p_dfu->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
+}
+
+
+/**@brief     Function for checking if the CCCD of DFU Control point is configured for Notification.
+ *
+ * @details   This function checks if the CCCD of DFU Control Point characteristic is configured
+ *            for Notification by the DFU Controller.
+ *
+ * @param[in] p_dfu DFU Service structure.
+ *
+ * @return    True if the CCCD of DFU Control Point characteristic is configured for Notification.
+ *            False otherwise.
+ */
+static bool is_cccd_configured(ble_dfu_t * p_dfu)
+{
+    // Check if the CCCDs are configured.
+    uint16_t cccd_len = BLE_CCCD_VALUE_LEN;
+    uint8_t  cccd_val_buf[BLE_CCCD_VALUE_LEN];
+
+    // Check the CCCD Value of DFU Control Point.
+    uint32_t err_code = sd_ble_gatts_value_get(p_dfu->dfu_ctrl_pt_handles.cccd_handle,
+                                               0,
+                                               &cccd_len,
+                                               cccd_val_buf);
+    if (err_code != NRF_SUCCESS)
+    {
+        if (p_dfu->error_handler != NULL)
+        {
+            p_dfu->error_handler(err_code);
+        }
+        return false;
+    }
+
+    return ble_srv_is_notification_enabled(cccd_val_buf);
+}
+
+
+/**@brief     Function for handling a Write event on the Control Point characteristic.
+ *
+ * @param[in] p_dfu             DFU Service Structure.
+ * @param[in] p_ble_write_evt   Pointer to the write event received from BLE stack.
+ *
+ * @return    NRF_SUCCESS on successful processing of control point write. Otherwise an error code.
+ */
+static uint32_t on_ctrl_pt_write(ble_dfu_t * p_dfu, ble_gatts_evt_write_t * p_ble_write_evt)
+{
+    ble_gatts_rw_authorize_reply_params_t write_authorize_reply;
+
+    write_authorize_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
+
+    if (!is_cccd_configured(p_dfu))
+    {
+        // Send an error response to the peer indicating that the CCCD is improperly configured.
+        write_authorize_reply.params.write.gatt_status =
+            BLE_GATT_STATUS_ATTERR_CPS_CCCD_CONFIG_ERROR;
+
+        return (sd_ble_gatts_rw_authorize_reply(p_dfu->conn_handle, &write_authorize_reply));
+
+    }
+    else
+    {
+        uint32_t err_code;
+
+        write_authorize_reply.params.write.gatt_status = BLE_GATT_STATUS_SUCCESS;
+
+        err_code = (sd_ble_gatts_rw_authorize_reply(p_dfu->conn_handle, &write_authorize_reply));
+
+        if (err_code != NRF_SUCCESS)
+        {
+            return err_code;
+        }
+    }
+
+    ble_dfu_evt_t ble_dfu_evt;
+
+    switch (p_ble_write_evt->data[0])
+    {
+        case OP_CODE_START_DFU:
+            ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_START;
+
+            if (p_ble_write_evt->len < PKT_START_DFU_PARAM_LEN)
+            {
+                return ble_dfu_response_send(p_dfu,
+                                             (ble_dfu_procedure_t) p_ble_write_evt->data[0],
+                                             BLE_DFU_RESP_VAL_OPER_FAILED);
+            }
+
+            ble_dfu_evt.evt.ble_dfu_pkt_write.len    = 1;
+            ble_dfu_evt.evt.ble_dfu_pkt_write.p_data = &(p_ble_write_evt->data[1]);
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+            break;
+
+        case OP_CODE_RECEIVE_INIT:
+            ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_RECEIVE_INIT_DATA;
+
+            if (p_ble_write_evt->len < PKT_INIT_DFU_PARAM_LEN)
+            {
+                return ble_dfu_response_send(p_dfu,
+                                             (ble_dfu_procedure_t) p_ble_write_evt->data[0],
+                                             BLE_DFU_RESP_VAL_OPER_FAILED);
+            }
+            
+            ble_dfu_evt.evt.ble_dfu_pkt_write.len    = 1;
+            ble_dfu_evt.evt.ble_dfu_pkt_write.p_data = &(p_ble_write_evt->data[1]);
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+            break;
+
+        case OP_CODE_RECEIVE_FW:
+            ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_RECEIVE_APP_DATA;
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+            break;
+
+        case OP_CODE_VALIDATE:
+            ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_VALIDATE;
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+            break;
+
+        case OP_CODE_ACTIVATE_N_RESET:
+            ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_ACTIVATE_N_RESET;
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+            break;
+
+        case OP_CODE_SYS_RESET:
+            ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_SYS_RESET;
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+            break;
+
+        case OP_CODE_PKT_RCPT_NOTIF_REQ:
+            if (p_ble_write_evt->len < PKT_RCPT_NOTIF_REQ_LEN)
+            {
+                return (ble_dfu_response_send(p_dfu,
+                                              BLE_DFU_PKT_RCPT_REQ_PROCEDURE,
+                                              BLE_DFU_RESP_VAL_NOT_SUPPORTED));
+            }
+
+            ble_dfu_evt.evt.pkt_rcpt_notif_req.num_of_pkts =
+                uint16_decode(&(p_ble_write_evt->data[1]));
+
+            if (ble_dfu_evt.evt.pkt_rcpt_notif_req.num_of_pkts == 0)
+            {
+                ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_PKT_RCPT_NOTIF_DISABLED;
+            }
+            else
+            {
+                ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_PKT_RCPT_NOTIF_ENABLED;
+            }
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+
+            break;
+
+        case OP_CODE_IMAGE_SIZE_REQ:
+            ble_dfu_evt.ble_dfu_evt_type = BLE_DFU_BYTES_RECEIVED_SEND;
+
+            p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+            break;
+
+        default:
+            // Unsupported op code.
+            return ble_dfu_response_send(p_dfu,
+                                         (ble_dfu_procedure_t) p_ble_write_evt->data[0],
+                                         BLE_DFU_RESP_VAL_NOT_SUPPORTED);
+    }
+    return NRF_SUCCESS;
+}
+
+
+/**@brief     Function for handling the @ref BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST event from the S110
+ *            Stack.
+ *
+ * @param[in] p_dfu     DFU Service Structure.
+ * @param[in] p_ble_evt Pointer to the event received from BLE stack.
+ */
+static void on_rw_auth_req(ble_dfu_t * p_dfu, ble_evt_t * p_ble_evt)
+{
+    ble_gatts_evt_rw_authorize_request_t * p_authorize_request;
+
+    p_authorize_request = &(p_ble_evt->evt.gatts_evt.params.authorize_request);
+
+    if (
+        (p_authorize_request->type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)
+        &&
+        (p_authorize_request->request.write.handle == p_dfu->dfu_ctrl_pt_handles.value_handle)
+       )
+    {
+        uint32_t err_code;
+
+        err_code = on_ctrl_pt_write(p_dfu, &(p_authorize_request->request.write));
+
+        if (err_code != NRF_SUCCESS && p_dfu->error_handler != NULL)
+        {
+            p_dfu->error_handler(err_code);
+        }
+    }
+}
+
+
+/**@brief     Function for handling the @ref BLE_GATTS_EVT_WRITE event from the S110 SoftDevice.
+ *
+ * @param[in] p_dfu     DFU Service Structure.
+ * @param[in] p_ble_evt Pointer to the event received from BLE stack.
+ */
+static void on_write(ble_dfu_t * p_dfu, ble_evt_t * p_ble_evt)
+{
+    if (p_ble_evt->evt.gatts_evt.params.write.handle == p_dfu->dfu_pkt_handles.value_handle)
+    {
+        // DFU Packet written
+
+        ble_dfu_evt_t ble_dfu_evt;
+
+        ble_dfu_evt.ble_dfu_evt_type             = BLE_DFU_PACKET_WRITE;
+        ble_dfu_evt.evt.ble_dfu_pkt_write.len    = p_ble_evt->evt.gatts_evt.params.write.len;
+        ble_dfu_evt.evt.ble_dfu_pkt_write.p_data = p_ble_evt->evt.gatts_evt.params.write.data;
+
+        p_dfu->evt_handler(p_dfu, &ble_dfu_evt);
+    }
+}
+
+
+/**@brief     Function for handling the BLE_GAP_EVT_DISCONNECTED event from the S110 SoftDevice.
+ *
+ * @param[in] p_dfu     DFU Service Structure.
+ * @param[in] p_ble_evt Pointer to the event received from BLE stack.
+ */
+static void on_disconnect(ble_dfu_t * p_dfu, ble_evt_t * p_ble_evt)
+{
+    p_dfu->conn_handle = BLE_CONN_HANDLE_INVALID;
+}
+
+
+uint32_t ble_dfu_init(ble_dfu_t * p_dfu, ble_dfu_init_t * p_dfu_init)
+{
+    if ((p_dfu == NULL) || (p_dfu_init == NULL) || (p_dfu_init->evt_handler == NULL))
+    {
+        return NRF_ERROR_NULL;
+    }
+
+    p_dfu->conn_handle = BLE_CONN_HANDLE_INVALID;
+
+    ble_uuid_t service_uuid;
+    uint32_t   err_code;
+
+    const ble_uuid128_t base_uuid128 =
+    {
+        {
+            0x23, 0xD1, 0xBC, 0xEA, 0x5F, 0x78, 0x23, 0x15,
+            0xDE, 0xEF, 0x12, 0x12, 0x00, 0x00, 0x00, 0x00
+        }
+    };
+
+    service_uuid.uuid = BLE_DFU_SERVICE_UUID;
+
+    err_code = sd_ble_uuid_vs_add(&base_uuid128, &(service_uuid.type));
+    if (err_code != NRF_SUCCESS)
+    {
+        return err_code;
+    }
+
+    err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
+                                        &service_uuid,
+                                        &(p_dfu->service_handle));
+    if (err_code != NRF_SUCCESS)
+    {
+        return err_code;
+    }
+
+    p_dfu->uuid_type = service_uuid.type;
+
+    err_code = dfu_pkt_char_add(p_dfu);
+    if (err_code != NRF_SUCCESS)
+    {
+        return err_code;
+    }
+
+    err_code = dfu_ctrl_pt_add(p_dfu);
+    if (err_code != NRF_SUCCESS)
+    {
+        return err_code;
+    }
+
+    err_code = dfu_rev_char_add(p_dfu, p_dfu_init);
+    if (err_code != NRF_SUCCESS)
+    {
+        return err_code;
+    }
+
+    p_dfu->evt_handler = p_dfu_init->evt_handler;
+
+    if (p_dfu_init->error_handler != NULL)
+    {
+        p_dfu->error_handler = p_dfu_init->error_handler;
+    }
+
+    m_is_dfu_service_initialized = true;
+
+    return NRF_SUCCESS;
+}
+
+
+void ble_dfu_on_ble_evt(ble_dfu_t * p_dfu, ble_evt_t * p_ble_evt)
+{
+    if ((p_dfu == NULL) || (p_ble_evt == NULL))
+    {
+        return;
+    }
+
+    if (p_dfu->evt_handler != NULL)
+    {
+        switch (p_ble_evt->header.evt_id)
+        {
+            case BLE_GAP_EVT_CONNECTED:
+                on_connect(p_dfu, p_ble_evt);
+                break;
+
+            case BLE_GATTS_EVT_WRITE:
+                on_write(p_dfu, p_ble_evt);
+                break;
+
+            case BLE_GAP_EVT_DISCONNECTED:
+                on_disconnect(p_dfu, p_ble_evt);
+                break;
+
+            case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
+                on_rw_auth_req(p_dfu, p_ble_evt);
+                break;
+
+            default:
+                // No implementation needed.
+                break;
+        }
+    }
+}
+
+
+uint32_t ble_dfu_bytes_rcvd_report(ble_dfu_t * p_dfu, uint32_t num_of_firmware_bytes_rcvd)
+{
+    if (p_dfu == NULL)
+    {
+        return NRF_ERROR_NULL;
+    }
+
+    if ((p_dfu->conn_handle == BLE_CONN_HANDLE_INVALID) || !m_is_dfu_service_initialized)
+    {
+        return NRF_ERROR_INVALID_STATE;
+    }
+
+    ble_gatts_hvx_params_t hvx_params;
+    uint16_t               index = 0;
+
+    // Encode the Op Code.
+    m_notif_buffer[index++] = OP_CODE_RESPONSE;
+
+    // Encode the Reqest Op Code.
+    m_notif_buffer[index++] = OP_CODE_IMAGE_SIZE_REQ;
+
+    // Encode the Response Value.
+    m_notif_buffer[index++] = (uint8_t)BLE_DFU_RESP_VAL_SUCCESS;
+
+    index += uint32_encode(num_of_firmware_bytes_rcvd, &m_notif_buffer[index]);
+
+    memset(&hvx_params, 0, sizeof(hvx_params));
+
+    hvx_params.handle = p_dfu->dfu_ctrl_pt_handles.value_handle;
+    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
+    hvx_params.offset = 0;
+    hvx_params.p_len  = &index;
+    hvx_params.p_data = m_notif_buffer;
+
+    return sd_ble_gatts_hvx(p_dfu->conn_handle, &hvx_params);
+}
+
+
+uint32_t ble_dfu_pkts_rcpt_notify(ble_dfu_t * p_dfu, uint32_t num_of_firmware_bytes_rcvd)
+{
+    if (p_dfu == NULL)
+    {
+        return NRF_ERROR_NULL;
+    }
+
+    if ((p_dfu->conn_handle == BLE_CONN_HANDLE_INVALID) || !m_is_dfu_service_initialized)
+    {
+        return NRF_ERROR_INVALID_STATE;
+    }
+
+    ble_gatts_hvx_params_t hvx_params;
+    uint16_t               index = 0;
+
+    m_notif_buffer[index++] = OP_CODE_PKT_RCPT_NOTIF;
+
+    index += uint32_encode(num_of_firmware_bytes_rcvd, &m_notif_buffer[index]);
+
+    memset(&hvx_params, 0, sizeof(hvx_params));
+
+    hvx_params.handle = p_dfu->dfu_ctrl_pt_handles.value_handle;
+    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
+    hvx_params.offset = 0;
+    hvx_params.p_len  = &index;
+    hvx_params.p_data = m_notif_buffer;
+
+    return sd_ble_gatts_hvx(p_dfu->conn_handle, &hvx_params);
+}
+
+
+uint32_t ble_dfu_response_send(ble_dfu_t         * p_dfu,
+                               ble_dfu_procedure_t dfu_proc,
+                               ble_dfu_resp_val_t  resp_val)
+{
+    if (p_dfu == NULL)
+    {
+        return NRF_ERROR_NULL;
+    }
+
+    if ((p_dfu->conn_handle == BLE_CONN_HANDLE_INVALID) || !m_is_dfu_service_initialized)
+    {
+        return NRF_ERROR_INVALID_STATE;
+    }
+
+    ble_gatts_hvx_params_t hvx_params;
+    uint16_t               index = 0;
+
+    m_notif_buffer[index++] = OP_CODE_RESPONSE;
+
+    // Encode the Request Op code
+    m_notif_buffer[index++] = (uint8_t)dfu_proc;
+
+    // Encode the Response Value.
+    m_notif_buffer[index++] = (uint8_t)resp_val;
+
+    memset(&hvx_params, 0, sizeof(hvx_params));
+
+    hvx_params.handle = p_dfu->dfu_ctrl_pt_handles.value_handle;
+    hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
+    hvx_params.offset = 0;
+    hvx_params.p_len  = &index;
+    hvx_params.p_data = m_notif_buffer;
+
+    return sd_ble_gatts_hvx(p_dfu->conn_handle, &hvx_params);
+}
\ No newline at end of file