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diff --git a/arduino/libraries/Bluefruit52Lib/src/BLEDiscovery.h b/arduino/libraries/Bluefruit52Lib/src/BLEDiscovery.h
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+++ b/arduino/libraries/Bluefruit52Lib/src/BLEDiscovery.h
@@ -0,0 +1,115 @@
+/**************************************************************************/
+/*!
+    @file     BLEDiscovery.h
+    @author   hathach (tinyusb.org)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, Adafruit Industries (adafruit.com)
+    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 must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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.
+*/
+/**************************************************************************/
+#ifndef BLEDISCOVERY_H_
+#define BLEDISCOVERY_H_
+
+#include <Arduino.h>
+#include "bluefruit_common.h"
+#include "BLEClientCharacteristic.h"
+
+#include "BLEUuid.h"
+#include "BLEClientService.h"
+
+#define BLE_DISCOVERY_TIMEOUT     1000
+
+class BLEDiscovery
+{
+  private:
+    ble_gattc_handle_range_t _hdl_range;
+    AdaMsg _adamsg;
+    bool   _begun;
+
+    void  _event_handler(ble_evt_t* evt);
+
+  public:
+    BLEDiscovery(void);
+
+    void     begin(void);
+    bool     begun(void);
+
+    void                     setHandleRange(ble_gattc_handle_range_t handle_range);
+    ble_gattc_handle_range_t getHandleRange(void);
+
+    uint8_t  discoverCharacteristic(uint16_t conn_handle, BLEClientCharacteristic* chr[], uint8_t count);
+
+    uint8_t  discoverCharacteristic(uint16_t conn_handle, BLEClientCharacteristic& chr1)
+    {
+      BLEClientCharacteristic* chr_arr[] = {&chr1};
+      return discoverCharacteristic(conn_handle, chr_arr, arrcount(chr_arr));
+    }
+
+    uint8_t  discoverCharacteristic(uint16_t conn_handle, BLEClientCharacteristic& chr1, BLEClientCharacteristic& chr2)
+    {
+      BLEClientCharacteristic* chr_arr[] = {&chr1, &chr2};
+      return discoverCharacteristic(conn_handle, chr_arr, arrcount(chr_arr));
+    }
+
+    uint8_t  discoverCharacteristic(uint16_t conn_handle, BLEClientCharacteristic& chr1, BLEClientCharacteristic& chr2, BLEClientCharacteristic& chr3)
+    {
+      BLEClientCharacteristic* chr_arr[] = {&chr1, &chr2, &chr3};
+      return discoverCharacteristic(conn_handle, chr_arr, arrcount(chr_arr));
+    }
+
+    uint8_t  discoverCharacteristic(uint16_t conn_handle, BLEClientCharacteristic& chr1, BLEClientCharacteristic& chr2, BLEClientCharacteristic& chr3, BLEClientCharacteristic& chr4)
+    {
+      BLEClientCharacteristic* chr_arr[] = {&chr1, &chr2, &chr3, &chr4};
+      return discoverCharacteristic(conn_handle, chr_arr, arrcount(chr_arr));
+    }
+
+    uint8_t  discoverCharacteristic(uint16_t conn_handle, BLEClientCharacteristic& chr1, BLEClientCharacteristic& chr2, BLEClientCharacteristic& chr3, BLEClientCharacteristic& chr4, BLEClientCharacteristic& chr5)
+    {
+      BLEClientCharacteristic* chr_arr[] = {&chr1, &chr2, &chr3, &chr4, &chr5};
+      return discoverCharacteristic(conn_handle, chr_arr, arrcount(chr_arr));
+    }
+
+    uint8_t  discoverCharacteristic(uint16_t conn_handle, BLEClientCharacteristic& chr1, BLEClientCharacteristic& chr2, BLEClientCharacteristic& chr3, BLEClientCharacteristic& chr4, BLEClientCharacteristic& chr5, BLEClientCharacteristic& chr6)
+    {
+      BLEClientCharacteristic* chr_arr[] = {&chr1, &chr2, &chr3, &chr4, &chr5, &chr6};
+      return discoverCharacteristic(conn_handle, chr_arr, arrcount(chr_arr));
+    }
+
+    /*------------------------------------------------------------------*/
+    /* INTERNAL USAGE ONLY
+     * Although declare as public, it is meant to be invoked by internal
+     * code. User should not call these directly
+     *------------------------------------------------------------------*/
+    bool     _discoverService(uint16_t conn_handle, BLEClientService& svc, uint16_t start_handle = 1);
+    uint16_t _discoverDescriptor(uint16_t conn_handle, ble_gattc_evt_desc_disc_rsp_t* disc_desc, uint16_t bufsize, ble_gattc_handle_range_t hdl_range);
+
+    friend class AdafruitBluefruit;
+};
+
+#endif /* BLEDISCOVERY_H_ */