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Author Topic: How to send data to a webserver w/o uing the "client.print" command?  (Read 398 times)
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Andres_ARG
Buenos Aires, Argentina
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« on: October 03, 2012, 08:22:13 pm »
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Hello,
I'm working in a project to display the status and activation time of several digital inputs in a webserver based in an Arduino UNO + Ethernet shield + RTC module.
The problem I have is that the SRAM of the Arduino UNO gets easily full due to the "client.print" command line sed to display the data in the webserver. Because of this, I am currently analysing the possibility of programming a webserverd stored in the Ethernet shiled's SD card, inspired in the TinyWebServer.
The question I have is how to send Arduino data to the webserver without using the "client.print" comand line. Any suggestion to start?
(I'm not a HTML or Java expert)

Thank you very much.
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James C4S
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« Reply #1 on: October 03, 2012, 08:50:57 pm »
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client.print(F("whatever"));

F() keeps the const char in PROGMEM.
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zoomkat
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« Reply #2 on: October 03, 2012, 09:16:15 pm »
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Below is a short example of the F() progmem macro.

Code:
          client.println(F("<HTML>"));
          client.println(F("<HEAD>"));
          client.println(F("<TITLE>Arduino GET test page</TITLE>"));
          client.println(F("</HEAD>"));
          client.println(F("<BODY>"));

          client.println(F("<H1>Zoomkat's simple Arduino button</H1>"));
         
          client.println(F("<a href='/?on''>ON</a>"));
          client.println(F("<a href='/?off''>OFF</a>"));

          client.println(F("</BODY>"));
          client.println(F("</HTML>"));
 
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PaulS
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« Reply #3 on: October 04, 2012, 05:21:16 am »
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The problem is not with the client.print() or client.println() function taking space in SRAM. It is with the constant data being printed being stored in SRAM that can be a problem.

Code:
client.print(file.read());
will use no SRAM.

Not that sending one character at a time is good idea, but it illustrates a point.
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