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Arduino + sim900 + xively

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

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.

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