Dotaz: Help with AT commands

[ClyssaN]

Hello everyone,

I'm "desperate" and i hope you guys can help me.

I'm trying to send SMS using telnet connection and AT comands using the hardware "2N - VoiceBlue Lite", i think i've to use following commands:

AT!G=A6 Activation of SMS control(can be activated only in one session at same time) AT^SM=ch,len,pdu,csum Request to send a message via GSM module 0..31 or via any GSM module (ch=32). Possible answers: *smserr (busy,write) or *smsout

But i simple cannot find an example to understand the correct sintax/sequence of comands.

If i want to send the message "Hello World" to the cellphone number 9112312312, what would be the correct sequence/sintax of commands?

Any help or link to more information/examples would be very appreciated.

Thanks in advance.

ps: I apologize if this is not the correct forum but i'm really desperate.

Odpovědi

[rastos]

You have reached Czech web server dedicated to Linux and Open Source. While other languages are probably not strictly forbidden here, they aren't frequent either

Nevertheless brief surfing shows that you may want to look at Online PDU encoder/decoder and also this page for some code/examples how the message has to be encoded.

[ClyssaN]

Thank you very much

[NN]

ch.... module number(1..31, 32=any)
len... number of PDU bytes
PDU... message in PDU format
csum.. checksum of all PDU bytes (2 hexa digits) without carry

The sequence is:

AT!G=A6 (sms mode)
AT^SR|SD|SM|SG (sms read,delete,to module,to group)
AT!G=55 (smsm mode stop)

manual (work with sms..)

The PDU format is a little bit complicated..

[ClyssaN]

hello, thank you for your time.

I've login by telnet to the 2N - VoiceBlue Lite. Executed the:

AT!G=A6 and received the OK msg.

But now i'm having trouble with the correct params for the AT^SR command, expecially the CSUM.

I've enconded a msg using de PDU Enconder. The param ch (module) active is number 0.

 

AT^SM=0,68,26069110090000F111000D92301569324394F50000AA0CC8F71D14969741F977FD07,??

 

ch = 0 (seen by using the commnd AT&QALL)

len = 68 Bytes, i'm using the function strlen() from PHP

 

But how do i calculate the correct csum?!

 

Thank you for you time.

[ClyssaN]

anybody?!

[NN]

The easier way, contact the '2n' company. The AT command format is proprietary and without any detailed documentatation..

[Martin Zaloudek]

Chsum is 2-bytes summary of bytes (summary modulo 65536), writed in HEX format.

Here is a JAVA example:

String pduString = "26069110090000F111000D92301569324394F50000AA0CC8F71D14969741F977FD07";

byte[] pduBytes = DatatypeConverter.parseHexBinary(pduString);

int chsum = 0;

for (byte b : pduBytes) {

chsum += b;

}

chsum = chsum % 65536;

String finalyChsum = Integer.toHexString(chsum);

[Martin]

Sorry, right is make modulo 256 only.

String pduString = "26069110090000F111000D92301569324394F50000AA0CC8F71D14969741F977FD07";

byte[] pduBytes = DatatypeConverter.parseHexBinary(pduString);

int chsum = 0;

for (byte b : pduBytes) {

chsum += (int)b;

if (b < 0) chsum += 256; //java byte is signed

chsum = chsum % 256;

}

String finalyChsum = Integer.toHexString(chsum);