NRF52832 16 bit service UUID and 128 bit characteristic UUID

[omerKayten]

Hello everyone,

We want to program the other NRF52832 chip from the NRF52832 chip via OTA. The DFU service UUID is 16 bits (0xfe59). However, the characteristic UUIDs are 128 bits. We are having problems in the process of discovering them. Both service and characteristic UUIDs are 128-bit or 16-bit, no problem. But when one is 16 bits and the other is 128 bits, we cannot perform the discover operation.
Is there a solution for this? Or is there a sample project?

[Einar Thorsrud]

Hi,

You can find several SDK examples which combine 16 bit and 128 bit UUIDs, for instance the NUS (BLE UART) examples. Are you shore this is the problem?

What do you mean by " we cannot perform the discover operation"? Are you doing service discovery from the nRF or is it the peer doing service discovery? In what way does it not work?

Br,

Einar

[omerKayten]

In example,If the service UUID is 16 bit, the characteristic UUIDs are 16 bits.

If the service UUID is 128 bit, the characteristic UUIDs are 128 bits.

There is no sample project where service uuid is 16 bits and the characteristic UUID is 128 bits. We would like to program the NRF to NRF by discovering the DFU service and its characteristics.

Can you please help?

Good luck with.

[Einar Thorsrud]

OK, now I am closer to understanding. From the screenshot it seems you have added a 128 bit characteristic to a 16 bit service and that is working and you are able to do service discovery from nRF Connect. So the problem is not with the peripheral side, but that you are having problems discovering this from a nRF central?

[omerKayten]

Yes, exactly.

[Einar Thorsrud]

Can you upload your two projects so I can see what you have done and test on my side? (You can open a private case and refer to this thread if you don't want to share your code with the community).

[omerKayten]

• Fullscreen ble_lbs_c.c Download

  /**
   * Copyright (c) 2012 - 2018, Nordic Semiconductor ASA
   * 
   * All rights reserved.
   * 
   * 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, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, 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 Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   * 
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   * 
   * 5. Any software provided in binary form under this license must not be reverse
   *    engineered, decompiled, modified and/or disassembled.
   * 
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
   * 
   */
  #include "sdk_common.h"
  #if NRF_MODULE_ENABLED(BLE_LBS_C)
  
  #include "ble_lbs_c.h"
  #include "ble_db_discovery.h"
  #include "ble_types.h"
  #include "ble_srv_common.h"
  #include "ble_gattc.h"
  #define NRF_LOG_MODULE_NAME ble_lbs_c
  #include "nrf_log.h"
  NRF_LOG_MODULE_REGISTER();
  
  #define TX_BUFFER_MASK         0x07                  /**< TX Buffer mask, must be a mask of continuous zeroes, followed by continuous sequence of ones: 000...111. */
  #define TX_BUFFER_SIZE         (TX_BUFFER_MASK + 1)  /**< Size of send buffer, which is 1 higher than the mask. */
  
  #define WRITE_MESSAGE_LENGTH   BLE_CCCD_VALUE_LEN    /**< Length of the write message for CCCD. */
  #define WRITE_MESSAGE_LENGTH   BLE_CCCD_VALUE_LEN    /**< Length of the write message for CCCD. */
  
  typedef enum
  {
      READ_REQ,  /**< Type identifying that this tx_message is a read request. */
      WRITE_REQ  /**< Type identifying that this tx_message is a write request. */
  } tx_request_t;
  
  /**@brief Structure for writing a message to the peer, i.e. CCCD.
   */
  typedef struct
  {
      uint8_t                  gattc_value[WRITE_MESSAGE_LENGTH];  /**< The message to write. */
      ble_gattc_write_params_t gattc_params;                       /**< GATTC parameters for this message. */
  } write_params_t;
  
  /**@brief Structure for holding data to be transmitted to the connected central.
   */
  typedef struct
  {
      uint16_t     conn_handle;  /**< Connection handle to be used when transmitting this message. */
      tx_request_t type;         /**< Type of this message, i.e. read or write message. */
      union
      {
          uint16_t       read_handle;  /**< Read request message. */
          write_params_t write_req;    /**< Write request message. */
      } req;
  } tx_message_t;
  
  
  static tx_message_t m_tx_buffer[TX_BUFFER_SIZE];  /**< Transmit buffer for messages to be transmitted to the central. */
  static uint32_t     m_tx_insert_index = 0;        /**< Current index in the transmit buffer where the next message should be inserted. */
  static uint32_t     m_tx_index = 0;               /**< Current index in the transmit buffer from where the next message to be transmitted resides. */
  
  
  /**@brief Function for passing any pending request from the buffer to the stack.
   */
  static void tx_buffer_process(void)
  {
      if (m_tx_index != m_tx_insert_index)
      {
          uint32_t err_code;
  
          if (m_tx_buffer[m_tx_index].type == READ_REQ)
          {
              err_code = sd_ble_gattc_read(m_tx_buffer[m_tx_index].conn_handle,
                                           m_tx_buffer[m_tx_index].req.read_handle,
                                           0);
          }
          else
          {
              err_code = sd_ble_gattc_write(m_tx_buffer[m_tx_index].conn_handle,
                                            &m_tx_buffer[m_tx_index].req.write_req.gattc_params);
          }
          if (err_code == NRF_SUCCESS)
          {
              NRF_LOG_DEBUG("SD Read/Write API returns Success..");
              m_tx_index++;
              m_tx_index &= TX_BUFFER_MASK;
          }
          else
          {
              NRF_LOG_DEBUG("SD Read/Write API returns error. This message sending will be "
                  "attempted again..");
          }
      }
  }
  
  
  /**@brief Function for handling write response events.
   *
   * @param[in] p_ble_lbs_c Pointer to the Led Button Client structure.
   * @param[in] p_ble_evt   Pointer to the BLE event received.
   */
  static void on_write_rsp(ble_lbs_c_t * p_ble_lbs_c, ble_evt_t const * p_ble_evt)
  {
      // Check if the event if on the link for this instance
      if (p_ble_lbs_c->conn_handle != p_ble_evt->evt.gattc_evt.conn_handle)
      {
          return;
      }
      // Check if there is any message to be sent across to the peer and send it.
      tx_buffer_process();
  }
  
  
  /**@brief Function for handling Handle Value Notification received from the SoftDevice.
   *
   * @details This function will uses the Handle Value Notification received from the SoftDevice
   *          and checks if it is a notification of Button state from the peer. If
   *          it is, this function will decode the state of the button and send it to the
   *          application.
   *
   * @param[in] p_ble_lbs_c Pointer to the Led Button Client structure.
   * @param[in] p_ble_evt   Pointer to the BLE event received.
   */
  static void on_hvx(ble_lbs_c_t * p_ble_lbs_c, ble_evt_t const * p_ble_evt)
  {
      // Check if the event is on the link for this instance
      if (p_ble_lbs_c->conn_handle != p_ble_evt->evt.gattc_evt.conn_handle)
      {
          return;
      }
      // Check if this is a Button notification.
      if (p_ble_evt->evt.gattc_evt.params.hvx.handle == p_ble_lbs_c->peer_lbs_db.button_handle)
      {
          if (p_ble_evt->evt.gattc_evt.params.hvx.len == 1)
          {
              ble_lbs_c_evt_t ble_lbs_c_evt;
  
              ble_lbs_c_evt.evt_type                   = BLE_LBS_C_EVT_BUTTON_NOTIFICATION;
              ble_lbs_c_evt.conn_handle                = p_ble_lbs_c->conn_handle;
              ble_lbs_c_evt.params.button.button_state = p_ble_evt->evt.gattc_evt.params.hvx.data[0];
              p_ble_lbs_c->evt_handler(p_ble_lbs_c, &ble_lbs_c_evt);
          }
      }
  }
  
  
  /**@brief Function for handling Disconnected event received from the SoftDevice.
   *
   * @details This function check if the disconnect event is happening on the link
   *          associated with the current instance of the module, if so it will set its
   *          conn_handle to invalid.
   *
   * @param[in] p_ble_lbs_c Pointer to the Led Button Client structure.
   * @param[in] p_ble_evt   Pointer to the BLE event received.
   */
  static void on_disconnected(ble_lbs_c_t * p_ble_lbs_c, ble_evt_t const * p_ble_evt)
  {
      if (p_ble_lbs_c->conn_handle == p_ble_evt->evt.gap_evt.conn_handle)
      {
          p_ble_lbs_c->conn_handle                    = BLE_CONN_HANDLE_INVALID;
          p_ble_lbs_c->peer_lbs_db.button_cccd_handle = BLE_GATT_HANDLE_INVALID;
          p_ble_lbs_c->peer_lbs_db.button_handle      = BLE_GATT_HANDLE_INVALID;
          p_ble_lbs_c->peer_lbs_db.led_handle         = BLE_GATT_HANDLE_INVALID;
      }
  }
  
  
  void ble_lbs_on_db_disc_evt(ble_lbs_c_t * p_ble_lbs_c, ble_db_discovery_evt_t const * p_evt)
  {
  		NRF_LOG_INFO("ble_lbs_on_db_disc_evt\r\n");
      // Check if the Led Button Service was discovered.
  	NRF_LOG_INFO("p_evt->evt_type:%02x\r\n",p_evt->evt_type);
  	NRF_LOG_INFO("p_evt->params.discovered_db.srv_uuid.uuid:%02x\r\n",p_evt->params.discovered_db.srv_uuid.uuid);
  	NRF_LOG_INFO("p_evt->params.discovered_db.srv_uuid.type:%02x\r\n",p_evt->params.discovered_db.srv_uuid.type);
  
      if (p_evt->evt_type == BLE_DB_DISCOVERY_COMPLETE &&
          p_evt->params.discovered_db.srv_uuid.uuid == LBS_UUID_SERVICE  /*&&
         p_evt->params.discovered_db.srv_uuid.type == p_ble_lbs_c->uuid_type*/)
      {
  			NRF_LOG_INFO("BLE_DB_DISCOVERY_COMPLETE\r\n");
  			NRF_LOG_INFO("p_evt->params.discovered_db.char_count:%d",p_evt->params.discovered_db.char_count);
          ble_lbs_c_evt_t evt;
  
          evt.evt_type    = BLE_LBS_C_EVT_DISCOVERY_COMPLETE;
          evt.conn_handle = p_evt->conn_handle;
  
          for (uint32_t i = 0; i < p_evt->params.discovered_db.char_count; i++)
          {
              const ble_gatt_db_char_t * p_char = &(p_evt->params.discovered_db.charateristics[i]);
              switch (p_char->characteristic.uuid.uuid)
              {
                  case LBS_UUID_LED_CHAR:
  										NRF_LOG_INFO("LBS_UUID_LED_CHAR\r\n");
                      evt.params.peer_db.led_handle = p_char->characteristic.handle_value;
                      break;
                  case LBS_UUID_BUTTON_CHAR:
  									  NRF_LOG_INFO("LBS_UUID_BUTTON_CHAR\r\n");
                      evt.params.peer_db.button_handle      = p_char->characteristic.handle_value;
                      evt.params.peer_db.button_cccd_handle = p_char->cccd_handle;
                      break;
  
                  default:
  									NRF_LOG_INFO("DEFAULT\r\n");
  								NRF_LOG_INFO("p_char->characteristic.uuid.uuid:%02x\r\n",p_char->characteristic.uuid.uuid);
                      break;
              }
          }
  
          NRF_LOG_DEBUG("Led Button Service discovered at peer.");
          //If the instance has been assigned prior to db_discovery, assign the db_handles
          if (p_ble_lbs_c->conn_handle != BLE_CONN_HANDLE_INVALID)
          {
              if ((p_ble_lbs_c->peer_lbs_db.led_handle         == BLE_GATT_HANDLE_INVALID)&&
                  (p_ble_lbs_c->peer_lbs_db.button_handle      == BLE_GATT_HANDLE_INVALID)&&
                  (p_ble_lbs_c->peer_lbs_db.button_cccd_handle == BLE_GATT_HANDLE_INVALID))
              {
                  p_ble_lbs_c->peer_lbs_db = evt.params.peer_db;
              }
          }
  
          p_ble_lbs_c->evt_handler(p_ble_lbs_c, &evt);
  
      }
  }
  
  
  uint32_t ble_lbs_c_init(ble_lbs_c_t * p_ble_lbs_c, ble_lbs_c_init_t * p_ble_lbs_c_init)
  {
  	/*
      uint32_t      err_code;
      ble_uuid_t    lbs_uuid;
      ble_uuid128_t lbs_base_uuid = {LBS_UUID_BASE};
  
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c);
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c_init);
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c_init->evt_handler);
  
      p_ble_lbs_c->peer_lbs_db.button_cccd_handle = BLE_GATT_HANDLE_INVALID;
      p_ble_lbs_c->peer_lbs_db.button_handle      = BLE_GATT_HANDLE_INVALID;
      p_ble_lbs_c->peer_lbs_db.led_handle         = BLE_GATT_HANDLE_INVALID;
      p_ble_lbs_c->conn_handle                    = BLE_CONN_HANDLE_INVALID;
      p_ble_lbs_c->evt_handler                    = p_ble_lbs_c_init->evt_handler;
  
      err_code = sd_ble_uuid_vs_add(&lbs_base_uuid, &p_ble_lbs_c->uuid_type);
      if (err_code != NRF_SUCCESS)
      {
          return err_code;
      }
      VERIFY_SUCCESS(err_code);
  
      lbs_uuid.type = p_ble_lbs_c->uuid_type;
      lbs_uuid.uuid = LBS_UUID_SERVICE;
  
      return ble_db_discovery_evt_register(&lbs_uuid);
  		*/
  		
  		uint32_t      err_code;
      ble_uuid_t    lbs_uuid;
  		VERIFY_PARAM_NOT_NULL(p_ble_lbs_c);
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c_init);
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c_init->evt_handler);
  		p_ble_lbs_c->peer_lbs_db.button_cccd_handle = BLE_GATT_HANDLE_INVALID;
      p_ble_lbs_c->peer_lbs_db.button_handle      = BLE_GATT_HANDLE_INVALID;
      p_ble_lbs_c->peer_lbs_db.led_handle         = BLE_GATT_HANDLE_INVALID;
      p_ble_lbs_c->conn_handle                    = BLE_CONN_HANDLE_INVALID;
      p_ble_lbs_c->evt_handler                    = p_ble_lbs_c_init->evt_handler;  
  		lbs_uuid.type =BLE_UUID_TYPE_BLE;
      lbs_uuid.uuid = LBS_UUID_SERVICE;
  
      return ble_db_discovery_evt_register(&lbs_uuid);
  
  }
  
  void ble_lbs_c_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
  {
      if ((p_context == NULL) || (p_ble_evt == NULL))
      {
          return;
      }
  
      ble_lbs_c_t * p_ble_lbs_c = (ble_lbs_c_t *)p_context;
  
      switch (p_ble_evt->header.evt_id)
      {
          case BLE_GATTC_EVT_HVX:
              on_hvx(p_ble_lbs_c, p_ble_evt);
              break;
  
          case BLE_GATTC_EVT_WRITE_RSP:
              on_write_rsp(p_ble_lbs_c, p_ble_evt);
              break;
  
          case BLE_GAP_EVT_DISCONNECTED:
              on_disconnected(p_ble_lbs_c, p_ble_evt);
              break;
  
          default:
              break;
      }
  }
  
  
  /**@brief Function for configuring the CCCD.
   *
   * @param[in] conn_handle The connection handle on which to configure the CCCD.
   * @param[in] handle_cccd The handle of the CCCD to be configured.
   * @param[in] enable      Whether to enable or disable the CCCD.
   *
   * @return NRF_SUCCESS if the CCCD configure was successfully sent to the peer.
   */
  static uint32_t cccd_configure(uint16_t conn_handle, uint16_t handle_cccd, bool enable)
  {
      NRF_LOG_DEBUG("Configuring CCCD. CCCD Handle = %d, Connection Handle = %d",
          handle_cccd,conn_handle);
  
      tx_message_t * p_msg;
      uint16_t       cccd_val = enable ? BLE_GATT_HVX_NOTIFICATION : 0;
  
      p_msg              = &m_tx_buffer[m_tx_insert_index++];
      m_tx_insert_index &= TX_BUFFER_MASK;
  
      p_msg->req.write_req.gattc_params.handle   = handle_cccd;
      p_msg->req.write_req.gattc_params.len      = WRITE_MESSAGE_LENGTH;
      p_msg->req.write_req.gattc_params.p_value  = p_msg->req.write_req.gattc_value;
      p_msg->req.write_req.gattc_params.offset   = 0;
      p_msg->req.write_req.gattc_params.write_op = BLE_GATT_OP_WRITE_REQ;
      p_msg->req.write_req.gattc_value[0]        = LSB_16(cccd_val);
      p_msg->req.write_req.gattc_value[1]        = MSB_16(cccd_val);
      p_msg->conn_handle                         = conn_handle;
      p_msg->type                                = WRITE_REQ;
  
      tx_buffer_process();
      return NRF_SUCCESS;
  }
  
  
  uint32_t ble_lbs_c_button_notif_enable(ble_lbs_c_t * p_ble_lbs_c)
  {
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c);
  
      if (p_ble_lbs_c->conn_handle == BLE_CONN_HANDLE_INVALID)
      {
          return NRF_ERROR_INVALID_STATE;
      }
  
      return cccd_configure(p_ble_lbs_c->conn_handle,
                            p_ble_lbs_c->peer_lbs_db.button_cccd_handle,
                            true);
  }
  
  
  uint32_t ble_lbs_led_status_send(ble_lbs_c_t * p_ble_lbs_c, uint8_t status)
  {
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c);
  
      if (p_ble_lbs_c->conn_handle == BLE_CONN_HANDLE_INVALID)
      {
          return NRF_ERROR_INVALID_STATE;
      }
  
      NRF_LOG_DEBUG("writing LED status 0x%x", status);
  
      tx_message_t * p_msg;
  
      p_msg              = &m_tx_buffer[m_tx_insert_index++];
      m_tx_insert_index &= TX_BUFFER_MASK;
  
      p_msg->req.write_req.gattc_params.handle   = p_ble_lbs_c->peer_lbs_db.led_handle;
      p_msg->req.write_req.gattc_params.len      = sizeof(status);
      p_msg->req.write_req.gattc_params.p_value  = p_msg->req.write_req.gattc_value;
      p_msg->req.write_req.gattc_params.offset   = 0;
      p_msg->req.write_req.gattc_params.write_op = BLE_GATT_OP_WRITE_CMD;
      p_msg->req.write_req.gattc_value[0]        = status;
      p_msg->conn_handle                         = p_ble_lbs_c->conn_handle;
      p_msg->type                                = WRITE_REQ;
  
      tx_buffer_process();
      return NRF_SUCCESS;
  }
  
  uint32_t ble_lbs_c_handles_assign(ble_lbs_c_t    * p_ble_lbs_c,
                                    uint16_t         conn_handle,
                                    const lbs_db_t * p_peer_handles)
  {
      VERIFY_PARAM_NOT_NULL(p_ble_lbs_c);
  
      p_ble_lbs_c->conn_handle = conn_handle;
      if (p_peer_handles != NULL)
      {
          p_ble_lbs_c->peer_lbs_db = *p_peer_handles;
      }
      return NRF_SUCCESS;
  }
  
  #endif // NRF_MODULE_ENABLED(BLE_LBS_C)
  

  ble_lbs_c.h
  Fullscreen 5023.main.c Download

  /**
   * Copyright (c) 2014 - 2018, Nordic Semiconductor ASA
   * 
   * All rights reserved.
   * 
   * 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, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, 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 Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   * 
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   * 
   * 5. Any software provided in binary form under this license must not be reverse
   *    engineered, decompiled, modified and/or disassembled.
   * 
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
   * 
   */
  /**
   * @brief BLE LED Button Service central and client application main file.
   *
   * This file contains the source code for a sample client application using the LED Button service.
   */
  
  #include <stdint.h>
  #include <stdio.h>
  #include <string.h>
  #include "nrf_sdh.h"
  #include "nrf_sdh_ble.h"
  #include "nrf_sdh_soc.h"
  #include "nrf_pwr_mgmt.h"
  #include "app_timer.h"
  #include "boards.h"
  #include "bsp.h"
  #include "bsp_btn_ble.h"
  #include "ble.h"
  #include "ble_hci.h"
  #include "ble_advdata.h"
  #include "ble_advertising.h"
  #include "ble_conn_params.h"
  #include "ble_db_discovery.h"
  #include "ble_lbs_c.h"
  #include "nrf_ble_gatt.h"
  
  #include "nrf_log.h"
  #include "nrf_log_ctrl.h"
  #include "nrf_log_default_backends.h"
  
  
  #define CENTRAL_SCANNING_LED            BSP_BOARD_LED_0                     /**< Scanning LED will be on when the device is scanning. */
  #define CENTRAL_CONNECTED_LED           BSP_BOARD_LED_1                     /**< Connected LED will be on when the device is connected. */
  #define LEDBUTTON_LED                   BSP_BOARD_LED_2                     /**< LED to indicate a change of state of the the Button characteristic on the peer. */
  
  #define SCAN_INTERVAL                   0x00A0                              /**< Determines scan interval in units of 0.625 millisecond. */
  #define SCAN_WINDOW                     0x0050                              /**< Determines scan window in units of 0.625 millisecond. */
  #define SCAN_DURATION                   0x0000                              /**< Timout when scanning. 0x0000 disables timeout. */
  
  #define MIN_CONNECTION_INTERVAL         MSEC_TO_UNITS(7.5, UNIT_1_25_MS)    /**< Determines minimum connection interval in milliseconds. */
  #define MAX_CONNECTION_INTERVAL         MSEC_TO_UNITS(30, UNIT_1_25_MS)     /**< Determines maximum connection interval in milliseconds. */
  #define SLAVE_LATENCY                   0                                   /**< Determines slave latency in terms of connection events. */
  #define SUPERVISION_TIMEOUT             MSEC_TO_UNITS(4000, UNIT_10_MS)     /**< Determines supervision time-out in units of 10 milliseconds. */
  
  #define LEDBUTTON_BUTTON_PIN            BSP_BUTTON_0                        /**< Button that will write to the LED characteristic of the peer */
  #define BUTTON_DETECTION_DELAY          APP_TIMER_TICKS(50)                 /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */
  
  #define APP_BLE_CONN_CFG_TAG            1                                   /**< A tag identifying the SoftDevice BLE configuration. */
  #define APP_BLE_OBSERVER_PRIO           3                                   /**< Application's BLE observer priority. You shouldn't need to modify this value. */
  
  
  BLE_LBS_C_DEF(m_ble_lbs_c);                                     /**< Main structure used by the LBS client module. */
  NRF_BLE_GATT_DEF(m_gatt);                                       /**< GATT module instance. */
  BLE_DB_DISCOVERY_DEF(m_db_disc);                                /**< DB discovery module instance. */
  
  static char const m_target_periph_name[] = "Nordic_Blinky";     /**< Name of the device we try to connect to. This name is searched in the scan report data*/
  
  /**@brief Parameters used when scanning. */
  static ble_gap_scan_params_t const m_scan_params =
  {
      .active   = 1,
      .interval = SCAN_INTERVAL,
      .window   = SCAN_WINDOW,
  
      .timeout           = SCAN_DURATION,
      .scan_phys         = BLE_GAP_PHY_1MBPS,
      .filter_policy     = BLE_GAP_SCAN_FP_ACCEPT_ALL,
  };
  
  static uint8_t m_scan_buffer_data[BLE_GAP_SCAN_BUFFER_MIN]; /**< buffer where advertising reports will be stored by the SoftDevice. */
  
  /**@brief Pointer to the buffer where advertising reports will be stored by the SoftDevice. */
  static ble_data_t m_scan_buffer =
  {
      m_scan_buffer_data,
      BLE_GAP_SCAN_BUFFER_MIN
  };
  
  /**@brief Connection parameters requested for connection. */
  static ble_gap_conn_params_t const m_connection_param =
  {
      (uint16_t)MIN_CONNECTION_INTERVAL,
      (uint16_t)MAX_CONNECTION_INTERVAL,
      (uint16_t)SLAVE_LATENCY,
      (uint16_t)SUPERVISION_TIMEOUT
  };
  
  
  /**@brief Function to handle asserts in the SoftDevice.
   *
   * @details This function will be called in case of an assert in the SoftDevice.
   *
   * @warning This handler is an example only and does not fit a final product. You need to analyze
   *          how your product is supposed to react in case of Assert.
   * @warning On assert from the SoftDevice, the system can only recover on reset.
   *
   * @param[in] line_num     Line number of the failing ASSERT call.
   * @param[in] p_file_name  File name of the failing ASSERT call.
   */
  void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
  {
      app_error_handler(0xDEADBEEF, line_num, p_file_name);
  }
  
  
  /**@brief Function for the LEDs initialization.
   *
   * @details Initializes all LEDs used by the application.
   */
  static void leds_init(void)
  {
      bsp_board_init(BSP_INIT_LEDS);
  }
  
  
  /**@brief Function to start scanning.
   */
  static void scan_start(void)
  {
      ret_code_t err_code;
  
      (void) sd_ble_gap_scan_stop();
  
      err_code = sd_ble_gap_scan_start(&m_scan_params, &m_scan_buffer);
      APP_ERROR_CHECK(err_code);
  
      bsp_board_led_off(CENTRAL_CONNECTED_LED);
      bsp_board_led_on(CENTRAL_SCANNING_LED);
  }
  
  
  /**@brief Handles events coming from the LED Button central module.
   */
  static void lbs_c_evt_handler(ble_lbs_c_t * p_lbs_c, ble_lbs_c_evt_t * p_lbs_c_evt)
  {
      switch (p_lbs_c_evt->evt_type)
      {
          case BLE_LBS_C_EVT_DISCOVERY_COMPLETE:
          {
              ret_code_t err_code;
  
              err_code = ble_lbs_c_handles_assign(&m_ble_lbs_c,
                                                  p_lbs_c_evt->conn_handle,
                                                  &p_lbs_c_evt->params.peer_db);
              NRF_LOG_INFO("LED Button service discovered on conn_handle 0x%x.", p_lbs_c_evt->conn_handle);
  
              err_code = app_button_enable();
              APP_ERROR_CHECK(err_code);
  
              // LED Button service discovered. Enable notification of Button.
              err_code = ble_lbs_c_button_notif_enable(p_lbs_c);
              APP_ERROR_CHECK(err_code);
          } break; // BLE_LBS_C_EVT_DISCOVERY_COMPLETE
  
          case BLE_LBS_C_EVT_BUTTON_NOTIFICATION:
          {
              NRF_LOG_INFO("Button state changed on peer to 0x%x.", p_lbs_c_evt->params.button.button_state);
              if (p_lbs_c_evt->params.button.button_state)
              {
                  bsp_board_led_on(LEDBUTTON_LED);
              }
              else
              {
                  bsp_board_led_off(LEDBUTTON_LED);
              }
          } break; // BLE_LBS_C_EVT_BUTTON_NOTIFICATION
  
          default:
              // No implementation needed.
              break;
      }
  }
  
  /**@brief Function for handling the advertising report BLE event.
   *
   * @param[in] p_adv_report  Advertising report from the SoftDevice.
   */
  static void on_adv_report(ble_gap_evt_adv_report_t const * p_adv_report)
  {
  	/*
      ret_code_t err_code;
  
      if (ble_advdata_name_find(p_adv_report->data.p_data,
                                p_adv_report->data.len,
                                m_target_periph_name))
      {
          // Name is a match, initiate connection.
          err_code = sd_ble_gap_connect(&p_adv_report->peer_addr,
                                        &m_scan_params,
                                        &m_connection_param,
                                        APP_BLE_CONN_CFG_TAG);
          APP_ERROR_CHECK(err_code);
      }
      else
      {
          err_code = sd_ble_gap_scan_start(NULL, &m_scan_buffer);
          APP_ERROR_CHECK(err_code);
      }
  	*/
  	//NRF_LOG_INFO("on_adv_report\r\n");
  	    ret_code_t err_code;
  			uint8_t targetMac[6]={0xC8,0x9E,0xE8,0x9F,0xB8,0xF8};
  			NRF_LOG_INFO("%02x,%02x,%02x,%02x,%02x,%02x\r\n",*(p_adv_report->peer_addr.addr),*(p_adv_report->peer_addr.addr+1),*(p_adv_report->peer_addr.addr+2),*(p_adv_report->peer_addr.addr+3),*(p_adv_report->peer_addr.addr+4),*(p_adv_report->peer_addr.addr+5));
      if (0==memcmp(p_adv_report->peer_addr.addr,targetMac,6))
      {
          NRF_LOG_INFO("target mac address found\r\n");
          err_code = sd_ble_gap_connect(&p_adv_report->peer_addr,
                                        &m_scan_params,
                                        &m_connection_param,
                                        APP_BLE_CONN_CFG_TAG);
          APP_ERROR_CHECK(err_code);
      }
      else
      {
          err_code = sd_ble_gap_scan_start(NULL, &m_scan_buffer);
          APP_ERROR_CHECK(err_code);
      }
  	
  }
  
  
  /**@brief Function for handling BLE events.
   *
   * @param[in]   p_ble_evt   Bluetooth stack event.
   * @param[in]   p_context   Unused.
   */
  static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
  {
      ret_code_t err_code;
  
      // For readability.
      ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt;
  
      switch (p_ble_evt->header.evt_id)
      {
          // Upon connection, check which peripheral has connected (HR or RSC), initiate DB
          // discovery, update LEDs status and resume scanning if necessary. */
          case BLE_GAP_EVT_CONNECTED:
          {
              NRF_LOG_INFO("Connected.");
              err_code = ble_lbs_c_handles_assign(&m_ble_lbs_c, p_gap_evt->conn_handle, NULL);
              APP_ERROR_CHECK(err_code);
  
              err_code = ble_db_discovery_start(&m_db_disc, p_gap_evt->conn_handle);
              APP_ERROR_CHECK(err_code);
  
              // Update LEDs status, and check if we should be looking for more
              // peripherals to connect to.
              bsp_board_led_on(CENTRAL_CONNECTED_LED);
              bsp_board_led_off(CENTRAL_SCANNING_LED);
          } break;
  
          // Upon disconnection, reset the connection handle of the peer which disconnected, update
          // the LEDs status and start scanning again.
          case BLE_GAP_EVT_DISCONNECTED:
          {
              NRF_LOG_INFO("Disconnected.");
              scan_start();
          } break;
  
          case BLE_GAP_EVT_ADV_REPORT:
          {
              on_adv_report(&p_gap_evt->params.adv_report);
          } break;
  
          case BLE_GAP_EVT_TIMEOUT:
          {
              // We have not specified a timeout for scanning, so only connection attemps can timeout.
              if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN)
              {
                  NRF_LOG_DEBUG("Connection request timed out.");
              }
          } break;
  
          case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
          {
              // Accept parameters requested by peer.
              err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle,
                                          &p_gap_evt->params.conn_param_update_request.conn_params);
              APP_ERROR_CHECK(err_code);
          } break;
  
          case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
          {
              NRF_LOG_DEBUG("PHY update request.");
              ble_gap_phys_t const phys =
              {
                  .rx_phys = BLE_GAP_PHY_AUTO,
                  .tx_phys = BLE_GAP_PHY_AUTO,
              };
              err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
              APP_ERROR_CHECK(err_code);
          } break;
  
          case BLE_GATTC_EVT_TIMEOUT:
          {
              // Disconnect on GATT Client timeout event.
              NRF_LOG_DEBUG("GATT Client Timeout.");
              err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
                                               BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
              APP_ERROR_CHECK(err_code);
          } break;
  
          case BLE_GATTS_EVT_TIMEOUT:
          {
              // Disconnect on GATT Server timeout event.
              NRF_LOG_DEBUG("GATT Server Timeout.");
              err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
                                               BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
              APP_ERROR_CHECK(err_code);
          } break;
  
          default:
              // No implementation needed.
              break;
      }
  }
  
  
  /**@brief LED Button client initialization.
   */
  static void lbs_c_init(void)
  {
      ret_code_t       err_code;
      ble_lbs_c_init_t lbs_c_init_obj;
  
      lbs_c_init_obj.evt_handler = lbs_c_evt_handler;
  
      err_code = ble_lbs_c_init(&m_ble_lbs_c, &lbs_c_init_obj);
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for initializing the BLE stack.
   *
   * @details Initializes the SoftDevice and the BLE event interrupts.
   */
  static void ble_stack_init(void)
  {
      ret_code_t err_code;
  
      err_code = nrf_sdh_enable_request();
      APP_ERROR_CHECK(err_code);
  
      // Configure the BLE stack using the default settings.
      // Fetch the start address of the application RAM.
      uint32_t ram_start = 0;
      err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
      APP_ERROR_CHECK(err_code);
  
      // Enable BLE stack.
      err_code = nrf_sdh_ble_enable(&ram_start);
      APP_ERROR_CHECK(err_code);
  
      // Register a handler for BLE events.
      NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
  }
  
  
  /**@brief Function for handling events from the button handler module.
   *
   * @param[in] pin_no        The pin that the event applies to.
   * @param[in] button_action The button action (press/release).
   */
  static void button_event_handler(uint8_t pin_no, uint8_t button_action)
  {
      ret_code_t err_code;
  
      switch (pin_no)
      {
          case LEDBUTTON_BUTTON_PIN:
              err_code = ble_lbs_led_status_send(&m_ble_lbs_c, button_action);
              if (err_code != NRF_SUCCESS &&
                  err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                  err_code != NRF_ERROR_INVALID_STATE)
              {
                  APP_ERROR_CHECK(err_code);
              }
              if (err_code == NRF_SUCCESS)
              {
                  NRF_LOG_INFO("LBS write LED state %d", button_action);
              }
              break;
  
          default:
              APP_ERROR_HANDLER(pin_no);
              break;
      }
  }
  
  
  /**@brief Function for initializing the button handler module.
   */
  static void buttons_init(void)
  {
      ret_code_t err_code;
  
      //The array must be static because a pointer to it will be saved in the button handler module.
      static app_button_cfg_t buttons[] =
      {
          {LEDBUTTON_BUTTON_PIN, false, BUTTON_PULL, button_event_handler}
      };
  
      err_code = app_button_init(buttons, ARRAY_SIZE(buttons),
                                 BUTTON_DETECTION_DELAY);
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for handling database discovery events.
   *
   * @details This function is callback function to handle events from the database discovery module.
   *          Depending on the UUIDs that are discovered, this function should forward the events
   *          to their respective services.
   *
   * @param[in] p_event  Pointer to the database discovery event.
   */
  static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
  {
      ble_lbs_on_db_disc_evt(&m_ble_lbs_c, p_evt);
  }
  
  
  /**@brief Database discovery initialization.
   */
  static void db_discovery_init(void)
  {
      ret_code_t err_code = ble_db_discovery_init(db_disc_handler);
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for initializing the log.
   */
  static void log_init(void)
  {
      ret_code_t err_code = NRF_LOG_INIT(NULL);
      APP_ERROR_CHECK(err_code);
  
      NRF_LOG_DEFAULT_BACKENDS_INIT();
  }
  
  
  /**@brief Function for initializing the timer.
   */
  static void timer_init(void)
  {
      ret_code_t err_code = app_timer_init();
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for initializing the Power manager. */
  static void power_management_init(void)
  {
      ret_code_t err_code;
      err_code = nrf_pwr_mgmt_init();
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for initializing the GATT module.
   */
  static void gatt_init(void)
  {
      ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
      APP_ERROR_CHECK(err_code);
  }
  
  
  /**@brief Function for handling the idle state (main loop).
   *
   * @details Handle any pending log operation(s), then sleep until the next event occurs.
   */
  static void idle_state_handle(void)
  {
      NRF_LOG_FLUSH();
      nrf_pwr_mgmt_run();
  }
  
  
  int main(void)
  {
      // Initialize.
      log_init();
      timer_init();
      leds_init();
      buttons_init();
      power_management_init();
      ble_stack_init();
      gatt_init();
      db_discovery_init();
      lbs_c_init();
  
      // Start execution.
      NRF_LOG_INFO("Blinky CENTRAL example started.");
      scan_start();
  
      // Turn on the LED to signal scanning.
      bsp_board_led_on(CENTRAL_SCANNING_LED);
  
      // Enter main loop.
      for (;;)
      {
          idle_state_handle();
      }
  }
  

  Central example: ble_app_blinky_c
  Peripheral example: secure_bootloader (We didn't use the one in this SDK.
  any nRF5_SDK_15.0.0_a53641a \ examples \ dfu \ secure_bootloader \ pca10040_ble instance can be installed.))

Central connects to the peripheral mac address.

ble_lbs_on_db_disc_evt enters this event after the connection is established. However, this function does not match the uuid_type first.
 I removed that requirement. Then, after removing this requirement, the value of p_evt-> params.discovered_db.char_count is 2.
 But the characteristic UUIDs are always 00. It always enters the default state. The characterisc UUIDs do not appear correctly.

The files I modified in ble_app_blinky_c are as follows.

[Einar Thorsrud]

Hi,

The issue is caused by a missing call to sd_ble_uuid_vs_add(). The problem is fixed by adding it back and adjusting it so that you add the base you are actually testing with, which is BLE_NORDIC_VENDOR_BASE_UUID for the DFU service.

In practice, you just have to modify your ble_lbs_c.c function by including ble_dfu.h and add the following snippet in your modified ble_lbs_c_init():

    ble_uuid128_t lbs_base_uuid = BLE_NORDIC_VENDOR_BASE_UUID; // Instead of LBS_UUID_BASE in your test setup

    err_code = sd_ble_uuid_vs_add(&lbs_base_uuid, &p_ble_lbs_c->uuid_type);
    if (err_code != NRF_SUCCESS)
    {
        return err_code;
    }
    VERIFY_SUCCESS(err_code);