Add new BLEStringCharacateristic type

Author: sandeepmistry

Diff for: keywords.txt

@@ -28,6 +28,7 @@ BLELongCharacteristic	KEYWORD1
 BLEUnsignedLongCharacteristic	KEYWORD1
 BLEFloatCharacteristic	KEYWORD1
 BLEDoubleCharacteristic	KEYWORD1
+BLEStringCharacteristic	KEYWORD1
 
 #######################################
 # Methods and Functions (KEYWORD2)

Diff for: src/ArduinoBLE.h

@@ -22,6 +22,7 @@
 
 #include "local/BLELocalDevice.h"
 #include "BLEProperty.h"
+#include "BLEStringCharacteristic.h"
 #include "BLETypedCharacteristics.h"
 
 #endif

Diff for: src/BLEStringCharacteristic.cpp

@@ -0,0 +1,45 @@
+/*
+  This file is part of the ArduinoBLE library.
+  Copyright (c) 2018 Arduino SA. All rights reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "BLEStringCharacteristic.h"
+
+BLEStringCharacteristic::BLEStringCharacteristic(const char* uuid, unsigned char properties, int valueSize) :
+  BLECharacteristic(uuid, properties, valueSize)
+{
+}
+
+int BLEStringCharacteristic::writeValue(const String& value)
+{
+  return BLECharacteristic::writeValue(value.c_str());
+}
+
+String BLEStringCharacteristic::value(void)
+{
+  String str;
+  int length = BLECharacteristic::valueLength();
+  const uint8_t* val = BLECharacteristic::value();
+
+  str.reserve(length);
+
+  for (int i = 0; i < length; i++) {
+    str += (char)val[i];
+  }
+
+  return str;
+}

Diff for: src/BLEStringCharacteristic.h

@@ -0,0 +1,39 @@
+/*
+  This file is part of the ArduinoBLE library.
+  Copyright (c) 2018 Arduino SA. All rights reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _BLE_STRING_CHARACTERISTIC_H_
+#define _BLE_STRING_CHARACTERISTIC_H_
+
+#include <Arduino.h>
+
+#include "BLECharacteristic.h"
+
+class BLEStringCharacteristic : public BLECharacteristic
+{
+public:
+  BLEStringCharacteristic(const char* uuid, unsigned char properties, int valueSize);
+
+  int writeValue(const String& value);
+  int setValue(const String& value) { return writeValue(value); }
+  String value(void);
+
+private:
+};
+
+#endif