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I have a problem, I'm new to Arduino and I'm totally a beginner.

I bought a SIM900 Quad-band GSM / GPRS Shield for Arduino (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=221176159800&ssPageName=ADME:X:RTQ:US:1123) and I have two problems. (I use the test code that is found in the library)

First the device does not read every message, but only a few. one read and then 3 does not, then 2 read and then 4 do not read .....

Second I do not know how to connect to xively, no examples. I know how to connect and send data via an ethernet shield, but with SIM900 Quad-band GSM / GPRS Shield do not know how.

I download the library from http://www.gsmlib.org/download.html and fix the first problem with sms.

but I do not find a solution to the second problem, and I can not find and I need a simple example to send data to xively.

So if anyone can help I would be grateful

Vragolasti
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  • This question should be moved to http://arduino.stackexchange.com/. There should be more help there. – scubaFun Sep 03 '14 at 19:23

1 Answers1

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You'll need to learn how to have the SIM900 perform HTTP operations. Study the example shown in Step 8 at this Cooking Hacks tutorial

For posting data to Xively, study this example.

You'll need to merge how you communicate from the SIM900 with the right HTTP sequences in order to upload data to Xively.

Tim Cavanaugh
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  • Thank you for your prompt response. I study the example in cooking hack tutorial but the second example of how to send data to xively is for the original Arduino GPRS library and not for a shield used by sim900 I found an example: http://www.seeedstudio.com/wiki/GPRS_Shield_V1.0#SoftwareSerial_library_Notes here is used sim900 with an example how to connect to xively - cosm but it does not work for me I download library SoftwareSerial.h but I do not know if I have string.h Where can I download it. And maybe the problem is that I use the Arduino Mega, so I need something to reconnect – Vragolasti Sep 04 '14 at 19:04
  • The Xively example I included was to show you the right types of commands to send to Xively. You'll need to transmit those commands using the right format for a SIM900. Tackle your problems one at a time. Learn how to communicate with the SIM900 before even worrying about Xively. If you're using a current version of the Arduino IDE I don't think you need "string.h" – Tim Cavanaugh Sep 04 '14 at 20:04