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Arduino Forum Ethernet problem sending null characters
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  • client
  • client.print
  • ethernet
  • client.write
Related

Ethernet problem sending null characters

e14 Contributor
e14 Contributor over 13 years ago

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

Attachments:
EthernetCode.txt.zip
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  • e14 Contributor
    e14 Contributor over 13 years ago in reply to mcb1 +1
    Mark, I haven't tried with firefox, but I doubt that would make a difference. Be sure to copy & paste the quoted material first into your draft post before highlighting it in the draft, and then clicking…
  • billabott
    billabott over 13 years ago +1
    make a quote out of something you paste into a message, you don't have to quote the previous message, then delete everything in the quote, and then paste into the empty quote. In Firefox, the e14 UI Editor…
  • mcb1
    mcb1 over 13 years ago in reply to e14 Contributor +1
    Be sure to copy & paste the quoted material first into your draft post before highlighting it in the draft, and then clicking the "quote" icon. Are that be the difference ..... I wasn't pasting it in and…
Parents
  • billabott
    0 billabott over 13 years ago

    Are you understanding the examples provided at arduino.cc?

    http://arduino.cc/en/Guide/ArduinoWiFiShield

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  • e14 Contributor
    0 e14 Contributor over 13 years ago in reply to billabott

    I am using an Arduino UNO with an Ethernet Shield but have also tested with an Arduino Ethernet Board (wihout POE).

     

    Here is a code snippet that provides the result I explained.

     

    I understand how to use the Ethernet library and have been successful in comunicating with other web servers.

     

    Thanks  for your help,

     

    Nick

     

    P.S. I am trying to figure out how to add my attachment.

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  • billabott
    0 billabott over 13 years ago in reply to e14 Contributor

    A quick and dirty way is to quote the previous message and then replace all the text in the quote with your sketch (snippet).

    Or you can insert a table with one or two rows and one column and paste the sketch into a cell of the table.

     

     

    v

    void setup(){

    }

    void loop(){

    }

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  • e14 Contributor
    0 e14 Contributor over 13 years ago in reply to billabott

    Thanks,

     

    I added an attachment to my original post. I hope that works.

     

    Nick Amendola

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  • e14 Contributor
    0 e14 Contributor over 13 years ago in reply to billabott

    Bill,

       In order to make a quote out of something you paste into a message, you don't

    have to quote the previous message, then delete everything in the quote, and then

    paste into the empty quote.  Instead you can do the paste first, then select what

    you've pasted, and then click on the "quote previous message" icon.  Instead of

    quoting the previous message, it will quote what you've selected.

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  • billabott
    0 billabott over 13 years ago in reply to e14 Contributor

    I see your point and method.  Are you an e14 insider that does some design and coding of the User Interface?

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  • e14 Contributor
    0 e14 Contributor over 13 years ago in reply to billabott
    Are you an e14 insider that does some design and coding of the User Interface?

     

     

    No, not at all, and if I were, I wouldn't admit it.  image

     

    But I am interested in the design and coding of the UI, as noted here:

    http://www.element14.com/community/thread/24747?start=14&tstart=0

    http://www.element14.com/community/thread/23150?start=111&tstart=0

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Reply
  • e14 Contributor
    0 e14 Contributor over 13 years ago in reply to billabott
    Are you an e14 insider that does some design and coding of the User Interface?

     

     

    No, not at all, and if I were, I wouldn't admit it.  image

     

    But I am interested in the design and coding of the UI, as noted here:

    http://www.element14.com/community/thread/24747?start=14&tstart=0

    http://www.element14.com/community/thread/23150?start=111&tstart=0

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