Intercomunicate between two sim300 (GPRS)

[electronix_is]

sim300 at+cipserver

Hi,
I want to sending data from one of gprs module (sim300) to other. I have this:
at+cipcsgp=1,"vodafone.vodafone.ro"
OK
at+cipsrip=1 (show remote IP and port before received data, optional)
OK
at+clport="UDP","7777"
OK
at+cstt
OK
at+ciicr
OK
at+cifsr
172.28.64.184
at+cipstart="UDP","172.29.71.75","7777"
CONNECT OK

OK
at+cipsend
> Testing the data data transmit!
SEND OK
at+cipstatus
OK

STATE: CONNECT OK
but i don't see data. Where is? To second module I have this:
at+cipcsgp=1,"vodafone.vodafone.ro"
OK
at+cipsrip=1 (show remote IP and port before received data, optional)
OK
at+clport="UDP","7777"
OK
at+cstt
OK
at+ciicr
OK
at+cifsr
172.29.71.75
at+cipserver
OK

SERVER OK
...and that is all. Where is data transmited?

 

[kamalrahimi65]

at+cipserver sim300

i have similar problem
plz if you receive your response help me

 

[pisoiu]

Many GSM operators shows a false IP address when you attach to GPRS network. What you see at cifsr (172.29.71.75) is a fake address, not the real one. It happened to me with Orange in Romania. I had on my table several test setups, and when I've attached them, several modems reported the same IP address. This is frequent on the public APN used by operators because there a real IP address is not required, the application are mostly clients. If you need to use a server application, you'll have to talk with your operator and obtain another APN which gives you real IP address. But this usually comes with some extra costs...