Hi All,
I have a problem to send SMS over GPRS, I tried these commands:
at+cgatt=1
OK
at+cgsms=0
OK
at+cmgs=“phone number”
Testing (ctrl-Z)
ERROR
Some body help me to solve this problem , thanks before.
For a start, you need to enable the extended result codes to see specifically what this “ERROR” is:
AT+CRC=1
Thank-you for your advise, I tried your advise but I got same ERROR, here is the commands:
OK
at+cmgf=1
OK
at+cgatt=1
OK
at+cgsms=0
OK
at+crc=1
OK
at+cmgs=“phone number”
Testing (CTRL-Z)
ERROR
I am waiting your another aadvise, thanks before.
regards
Try with AT+CMEE=1
Thank-you for the advised, here is the result:
OK
at+cmgf=1
OK
at+cgatt=1
OK
at+cgsms=0
OK
at+crc=1
OK
at+CMEE=1
OK
at+cmgs=“phone number”
Testing [CTRl-Z]
+CMS ERROR: 50
Any comments ?
+CSM ERROR: 50 means “Requested facility not subscribed”
Are you certain that you should be able to send SMS over GPRS with your SIM?
If you use AT+CGSMS=2 instead, the SMS sending will failover to the usual circuit switched if GPRS is not available.
You might want to actually activate a GPRS session before you try as well.
Check +CGDCONT and +CGACT
Should I configure with IP or PPP ??
You haven’t answered the basic question:
If your SIM (ie, your subscription with your provider) doesn’t support it, then nothing you can do with AT commands or any other configuration of the terminal can help!
The SIM is supported for the GPRS.
That wasn’t the question!
Does “the SIM” support SMS over GPRS?
It might support GPRS, but might not allow SMS over GPRS…
Yes the SIM/operator support SMS over GSM, I just tried with the celullar hand-set !
BTW is it possible this M1306B configure for point-to-point communication over GPRS ? How the configuration is and how to configure the M1306B ?
But how do you know that it used GPRS to send the SMS?
How do you know that it didn’t just use the “normal” GSM channels?
What sort of connection - “raw” sockets? FTP? HTTP? or what?
In an Open-AT Application, or with AT commands?
No, that is wrong!
Refer to AT+CGSMS in the AT Commands manual.
I’m not sure why one might want to send SMS over GPRS, though… 
I suppose only if your service provider happens to offer an advantageous tariff
It’s not so much whether they’re fixed as whether they are Public IP addresses;
If you don’t have a Public IP address, there is no guarantee that any other device (whether GPRS or not) will be able to connect to it.
You’d only strictly need one Public IP address - but then you’d have to ensure that all contacts are initiated by the other unit.
By default, yes - but you can always pay for static IP addresses, and you can pay for Public IP addresses.
This still requires the IP address to be a Public address
In fact, outside the private network, it is guaranteed that nothing will be able to access the private addresses!
And I don’t think there’s any guarantee that devices on the same GPRS network will necessarily share the same private IP address space…