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diff --git a/arduino/libraries/Bluefruit52Lib/src/bluefruit_common.h b/arduino/libraries/Bluefruit52Lib/src/bluefruit_common.h
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+++ b/arduino/libraries/Bluefruit52Lib/src/bluefruit_common.h
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+/**************************************************************************/
+/*!
+    @file     bluefruit_common.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 BLUEFRUIT_COMMON_H_
+#define BLUEFRUIT_COMMON_H_
+
+#include <Arduino.h>
+#include "ble.h"
+#include "nrf_sdm.h"
+
+#include "utility/AdaMsg.h"
+
+#define CFG_MAX_DEVNAME_LEN                     32
+
+#define BLE_GENERIC_TIMEOUT                     100
+
+#define BLE_GAP_CONN_SUPERVISION_TIMEOUT_MS     2000
+#define BLE_GAP_CONN_SLAVE_LATENCY              0
+
+#define BLE_GAP_CONN_MIN_INTERVAL_DFLT          MS100TO125(20)
+#define BLE_GAP_CONN_MAX_INTERVAL_DFLT          MS100TO125(30)
+
+// Converts an integer of 1.25ms units to msecs
+#define MS100TO125(ms100) (((ms100)*4)/5)
+
+// Converts an integer of 1.25ms units to msecs
+#define MS125TO100(ms125) (((ms125)*5)/4)
+
+// Converts msec to 0.625 unit
+#define MS1000TO625(ms1000) (((ms1000)*8)/5)
+
+// Converts an integer of 625ms units to msecs
+#define MS625TO1000(u625) ( ((u625)*5) / 8 )
+
+#endif /* BLUEFRUIT_COMMON_H_ */