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SIM900 command questions

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ARQuattr

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Hi, I started using the SIM900 module recently and it's generally working fairly well. I just need to improve the robustness so it parses all the various possible responses properly, which is difficult since there are so many commands, formats, and states.

One question I have is about the CGDCONT command. Is it critical to define the PDP context this way? I've seen most posts here include this instruction, but the sample instruction sequence I received from my distributor didn't use it, and it seems to work without it. I just don't want to leave it out if it needs to be there for reliability, on the other hand I don't want to add redundant or unnecessary commands.

Here's what I get as default when the module is powered up:

AT+CGDCONT?
+CGDCONT: 3,"IP","","0.0.0.0",0,0
OK

According to the SIM AT command set, when the PDP_addr is 0.0.0.0 "a dynamic address will be requested". Do I need to set it to the APN?

Thanks
 

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