Windows Mobile data transfer limit

I use LV 2011 and 2011 Mobile to transfer data wireless to a pocket to a PC computer. Program receiver to PC errors when a large part of the data need to be transferred to your handheld. Here are the details.

There is a file of inventory on the handheld, 20880 bytes long, which is to be transferred to the computer. When you click on the transfer button, the receiving program on PC gives a time-out error, got only 16380 bytes. This error is repeated, no matter how many time I feed the "ms timeout. I even tried "wait indefinitely", but she has still than 16380 bytes of data out of the 20880.

I moved the transfer program of the handheld to PC, then there is no problem. This makes me think that there is a limit of size of the data, you can transfer using LV Mobile 2011? But 20880 bytes is really that much data, is it? What's not here? Help please.

MengHuiHanTang,

Because they have been out one mistake regardless of time-out, its possible that the TCP buffer is not large enough. I did some research on this, and it is possible that we try to send a packet larger than the size of the TCP buffer for the device to windows mobile 5.  I don't think it's a coincidence that you're stopping just before 16384 bytes (2 ^ 14 with just enough space on the left of a heading). I think that the TCP window size setting is actually defined in the registry HKLM\Comm\Tcpip\Parms\TcpWindowSize key, according to this article here. You may need to change to adapt to the device of the chance. I think that later OSs have window scaling a bit take care of this for us.

The easier way to maybe solve this problem would be to break up of writing in smaller packages. By writing just twice with half of the information each time should also take care of the issue.

Kind regards

Kyle Mozdzyn

Engineering applications

National Instruments

Tags: NI Software

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