version 5.2.1

fix potentially errors in PIConstChars compare methods
PIHIDevice::open() for open last device
PIVariant::toPoint() now can cast from PIMathVectord

libs/main/system/pihidevice.h

@@ -94,6 +94,7 @@ public:
 
 	bool isOpened() const;
 	bool open(const PIHIDeviceInfo & device);
+	bool open();
 	void close();
 	void start();
 	void stop();