Use HID serial number

Controllers/HIDLampArrayController/HIDLampArrayController.cpp

@@ -13,6 +13,7 @@
 #include <cstring>
 #include "hid_util.h"
 #include "HIDLampArrayController.h"
+#include "StringUtils.h"
 
 HIDLampArrayController::HIDLampArrayController(hid_device *dev_handle, const char *path, std::string dev_name)
 {
@@ -132,7 +133,15 @@ std::string HIDLampArrayController::GetDeviceName()
 
 std::string HIDLampArrayController::GetSerialString()
 {
-    return("");
+    wchar_t serial_string[128];
+    int ret = hid_get_serial_number_string(dev, serial_string, 128);
+
+    if(ret != 0)
+    {
+        return("");
+    }
+
+    return(StringUtils::wstring_to_string(serial_string));
 }
 
 unsigned int HIDLampArrayController::GetLampArrayKind()