Electronic – Sending Multiple Messages using Sim300 gsm/gprs module

at commandsembeddedgsmsim

I have interfaced SIM300 Gsm module with lpc2468 through UART. My main motive is to send SMS when some special sequence run. Now my requirement is that I should send the same messages to two numbers.

Is it possible to send message to multiple numbers giving AT+CMGS command only once?

Right now I do:

AT+CMGF=1 //TEXT MODE
AT+CSCS ="GSM" //SET GSM MODE
AT+CMGS="+9198........." //FOR FIRST NUMBER
> HELLO
CTRL+Z

AT+CMGS="+91981........" //FOR SECOND NUMBER
> HELLO
CTRL+Z

Is something like this possible

AT+CMGS="+9198........","+91981........."
>HELLO
CTRL+Z

Best Answer

The parameter that contains the number is the GSM 03.40 destination address and only allows a single value. You'll need to loop through the list of recipients and send multiple commands to send multiple messages. If you check GSM 03.40 on Wikipedia you'll see the TP-DA destination address only allows 2-12 octets.

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Arduino announced a GSM/GPRS shield (see also here) recently. I have no experience how it works, but I guess it's worth a look.

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You're opening the socket OK but the part you're missing is that you'll need to issue an HTTP request to the server. The full documentation you'll probably want to look at is RFC2616 but the request should look roughly like this:

GET /SUB/PAGE.PY HTTP/1.1
Host: www.MYSERVR.com
(blank line)

The above probably violates a few standards because there are additional headers I believe you should include, but it should give you a pointer in the right direction. Maybe for a start install a Telnet client and try connecting that way rather than using a web browser so you can check that the request works OK and easily check the response you get back.

You need to send the above over the socket, so for that module take a look at AT+AIPW command.

Best Answer

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