Playing with my USB dongle that is a 3g modem, i felt the need to send message using this modem.
but i saw that it has no support to send message using AT command, well to check this use the AT+CSMS command before any shake.
In the case when you have a GSM/GPRS modem/mobile phone with full support of what we talk about before :
You can easily sending message using the great Kannel, or from scratch:
In this article we will focus on how to send message using AT command and we can resume this in five steps :
1. Initializing the modem
2. Setting SMSC
3. Storing the message into storage
4. Sending
5. Delete the message from storage
First of all, to interact with the device you need a serial tools like screen or may be minicom.
Well i recommend the use of screen when you work on pseudo devices :
Let’s connect to the device (ttyUSB0) using screen with a baud of 9600 :
$ screen /dev/ttyUSB0 9600
1. Send the initialize strings :
AT
OK
ATZ
OK
2. Define the service center address as follow and verify that it is correct:
AT+CSCA=”+85290000000″,145
145 means that we deal with formatted address using typical ISDN/telephony numbering plan
(ITU E.164/E.163) and it is an international number.
3. In the fact if you may send a text messages to +85291234567, write the message first to storage area, as like as:
AT+CMGW=”+85291234567″,145,”STO UNSENT”Hello world
4. And finally you can now send the message, referenced with it index:
AT+CMSS=3
You can also do this if you rather to send it to mutli destinations:
AT+CMSS=3,”91234567″
AT+CMSS=3,”97777777″
AT+CMSS=3,”96666666″
Lastly, delete the message from storage area.
5. AT+CMGD=3
To read the first message indexed with 1 :
AT+CMGR=1
Also if you need to play or list all the message in the storage
AT+CMGL=”ALL”