PIPacketExtractor fix

libs/main/io_devices/piserial.cpp

@@ -707,7 +707,7 @@ bool PISerial::openDevice() {
 	PIString wp   = "//./" + p;
 	PRIVATE->hCom = CreateFileA(wp.dataAscii(), ds, sm, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
 	if (PRIVATE->hCom == INVALID_HANDLE_VALUE) {
-		piCoutObj << "Unable to open \"" << p << "\"";
+		piCoutObj << "Unable to open \"" << p << "\"" << errorString();
 		fd = -1;
 		return false;
 	}

libs/main/io_utils/pipacketextractor.cpp

@@ -305,13 +305,17 @@ PIString PIPacketExtractor::constructFullPathDevice() const {
 
 
 bool PIPacketExtractor::openDevice() {
-	if (dev) return dev->open();
+	if (dev) {
+		if (!dev->isOpened()) return dev->open();
+	}
 	return false;
 }
 
 
 bool PIPacketExtractor::closeDevice() {
-	if (dev) return dev->close();
+	if (dev) {
+		if (dev->isOpened()) return dev->close();
+	}
 	return false;
 }