Sending SMS using GSM Modem - PHP

[jhefreyzz]

So 2 ung nag-PM sakin tungkol kung paano magsend ng SMS by using a gsm modem.

Prerequisite:
a working GSM Modem [with load]
PHP installed or Xampp

How to send an SMS using a GSM Modem

1. Check what ("COM PORT") of your modem

How to check?

• Open your device manager
• There will be list of devices categorize, now look into the modem part
• Click on the modem device you've used
• I'm not sure whether is it right, but after you click on your modem device it will prompt a small dialog which you will find the advanced tab
• On the advanced tab you will see the COM number

2. Check if the port is accessible through CMD (command prompt)

• Open cmd and type in "mode COM(1-5) ex. mode COM6"
• Check if there will be a response with the details of the COM Port like the baud-rate

3. If everything is set, open your Text Editor

Those bold texts are the things you need to modify:

• If the exec() uses COM5 then you will also use it into 2nd line of code in the fopen()
• the 3rd bold text would be the recepient of the message
• the 4th bold text would be the message of the text

exec("MODE [B]COM6[/B]: BAUD=9600 PARITY=N DATA=8 STOP=1", $output, $retval);
           $fp=fopen("[B]COM6[/B]","r+");
           fputs($fp, "AT+CMGF=1\r");
           fputs($fp, "AT+CMGS=\"[B]09999999999[/B]\"\r");
           fputs($fp, "[B]message here[/B]");
           fputs($fp, chr(26));
           fclose($fp);

Please note that the following method of sending SMS has its limitations:

• The message has a limit of 160 characters [can be mitigated by using SMS PDU Module]
• For you to send multiple recipients it will involve iterating over array of contact numbers. Meaning it will perform the same request that varies on the contact number, which necessarily need the sleep method to make sure that there will be allotted time for each request to be send
• Cannot send multiple recipients directly

A good alternative to this one is by using a SMS Gateway Servers.