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Ethernet problem sending null characters

e14 Contributor

Thank you in advance for your kind help.

I am using the Ethernet Library (client.print function) to access an electronic device which supports TCP/IP.

I must send a command string to the device that contains several NULL characters. I cannot send the string since the first NULL character terminates the transmission.

I tried sending 1 byte at a time and that works when sent to a VB.NET simulator that I wrote, however, it doesn't work with the device I am trying to use. I think the device may be expecting the entire command to be contained in a single packet. I tried using a string object and that didn't work either.

I need to be able to specify the data and its length and send it as a single packet.

Can anyone out there help me ?

Thanks,

Nick

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EthernetCode.txt.zip
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  • 0 in reply to e14 Contributor

    You are correct, Nick.  Since, I am not inclined to open any zip file.  I will pose some questions to you.  What is the device you are communicating with?  What is it supposed to DO when the string of nulls is detected?  Is it hanging up when the single null arrives?  Which process or hardware is breaking the (TCP?) connection?

    Is there an escape character(s) that will allow the string of nulls to get all the way thru to the device.

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