MC319Z: Unable to open connection to reader


I'm developing a simple application for MC319Z RFID reader using Visual Studio 2008 and EMDK v2.9.

I refer the EMDK Programmer's Guide in order to work with RFID.

The following code is used, just three strings:

string hostname = "";

RFIDReader rfid3 = new RFIDReader(hostname, 0, 0);


I know the RFIDReader class uses the LLRP service running on the device.

It's configured by default:


Port: 5084

Unfortunately I get an exception after the "Connect" method call:

     Exception occured: Symbol.RFID3.OperationFailureException: Connect

     at Symbol.RFID3.ProcessErrorCode.ThrowException(IntPtr readerHandle, String sMessage, RFIDResults results, Boolean      getLastError)

     at Symbol.RFID3.RFIDReader.Connect()

     Status: Unable to open connection to reader

The in-built demo app works stable.

It seems the LLRP service is busy.

I stopped and started RFID (the icon on the home screen indicates the "running" state), closed all the 3d party apps running in the background but I still can't access the reader.

How can I get rid of this problem?

Could you provide me some way to debug this issue, please?

Thank you.