Some resources to help you getting started with STM32 programming.
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Remote control using a cell phone from anywhere in the world!
The GSM-AUTO is a GSM remote control switch, it connects to the cell phone network and like a cell phone has its own cell phone number. The GSM-AUTO is activated by Sending SMS to its cell phone number, it will recognise an authorised telephone number calling it, reject the call without answering and switch ON or OFF the device connected to it, because it rejects the call without answering there are no call costs incurred.
It has 6 independent relay switches with normally open and normally closed switch contacts, these can be programmed to switch ON and OFF By sending SMS: R1 R2 R3 ....
The relay switches can also be switched ON or OFF by sending the GSM-AUTO a sms text message command. It can report the relay status by sending back a text message.
Applications are endless and include the remote control of heating and air conditioning in holiday homes, lighting, engine pre-heaters, aviation engine heaters, irrigation systems, water well pumps, pumping stations, cabin heaters, power cycle and reboot of remote servers, routers and computers.
Please note that this unit is hardcoded to work in mode 2 only, as in mode 1 only 1 relay can be operated, which limits its usability. So, mode 1 operations like switching devices via missed call won't work. There are some ways to switch back to mode 1, but that may require hardware changes, like desoldering some pins.