Through the GSM remote control LED
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The main function of this program is as follows:
GSM module at a later time, just wait for some time, since when LED1 is lit.
1. If we use a cell phone to send SMS to the phone number in the module "openled3" LED3 light up on the GSM module;
2. If we use a cell phone to send SMS to the phone number in the module that reads "openled4", LED4 on GSM module is lit;
3. If we use a cell phone to send SMS to the phone number in the module "closeled3" LED3 is off on the GSM module;
4. If we use a cell phone to send SMS to the phone number in the module that reads "closeled4", LED4 was extinguished on the GSM module;
5. send other messages, without any response the GSM module.