add BLEUuid toString()

Author: hathach

libraries/Bluefruit52Lib/src/BLEUuid.cpp

@@ -151,6 +151,25 @@ bool BLEUuid::begin(void)
   return true;
 }
 
+String BLEUuid::toString(void) const
+{
+  if (_str) return _str;
+
+  char result[38];
+  if (this->size() == 16)
+  {
+    sprintf(result, "%02X:%02X", _uuid.uuid);
+  }else
+  {
+    // uuid is little endian
+    sprintf(result, "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
+            _uuid128[15], _uuid128[14], _uuid128[13], _uuid128[12], _uuid128[11], _uuid128[10], _uuid128[ 9], _uuid128[ 8],
+            _uuid128[ 7], _uuid128[ 6], _uuid128[ 5], _uuid128[ 4], _uuid128[ 3], _uuid128[ 2], _uuid128[ 1], _uuid128[ 0]);
+  }
+
+  return result;
+}
+
 //--------------------------------------------------------------------+
 // Set & Get
 //--------------------------------------------------------------------+

libraries/Bluefruit52Lib/src/BLEUuid.h

@@ -66,6 +66,8 @@ class BLEUuid
     // Add UUID128 if needed, in case of UUID16, no actions is required
     bool begin(void);
 
+    String toString(void) const;
+
     bool operator==(const BLEUuid&   uuid) const;
     bool operator!=(const BLEUuid&   uuid) const;
     bool operator==(const ble_uuid_t uuid) const;