At+cdnscfg error sim900

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Rikr09

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Hello
i am using the sim900 to establish a TCP connection but without using an IP address if not a DNS create on NO-IP web page. I found on the AT COMMAND datasheet two commands: AT+CDNSCFG and the AT+CDNSGIP.

The AT+CDNSGIP answer me with the IP when I use it as follows: at+cdnsgip="DNS.no-ip.biz" but i have to query it about two or three times in order to answer me. Why happens this?

By other way, i dont know how to use or what does the AT+CDNSCFG; I am using as: AT+CDNSCFG="DNS.no-ip.biz","DNS.no-ip.biz" but i always receive an ERROR and i dont know why.

My idea is to use the CIPSTART command with a DNS not with a IP.

I hope you help me please.

Thanks!
 

The AT Commands required for establishing TCP Connection with a Server are

HTML: 
AT+CGATT=1 // All followed by CR & LF//
AT+CSTT= "APN of your Operator"  // CR & LF

AT+CIICR    // CR & LF

AT+CIFSR   //CR & LF

AT+CIPSTART = "TCP","Server IP Address","Port Number" //CR * LF

AT+CIPSNED  //CR & LF
> Ur Message 

then press "ctrl+Z" to send

Try this for UDP change UDP instead of TCP in AT+CIPSTART Command

Try first using Terminal Application only like Hyperteminal
 


Thanks for you reply.

Mainly that i want to know is how to use these DNS commands to estabish a TCP connection. I know how to do it as you wrote me and it is working fine...

Thanks again, i will waiting for your answer.
 

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