Some resources to help you getting started with STM32 programming.
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BEWARE: SIM800 peak power requirments is 3 Amps, as per documentation. Please beware of those cheap LM317 based power supply modules, which can't provide more than 1 Amps. You may experience connectivity issues with those modules. Our product is a high quality module, which uses LM2576 to handle the peak current requirements of SIM800 module and can easily handle up to 3 Amps. Those other manufacturers are selling junk modules, by doing massive cost cutting in various expensive components.
The SIM800 modem has a SIM800 GSM chip and RS232 interface while enables easy connection with the computer or laptop using the USB to Serial connector or to the microcontroller using the RS232 to TTL converter. Once you connect the SIM800 modem using the USB to RS232 connector, you need to find the correct COM port from the Device Manger of the USB to Serial Adapter. Then you can open Putty or any other terminal software and open an connection to that COM port at 9600 baud rate, which is the default baud rate of this modem.
Once a serial connection is open through the computer or your microcontroller you can start sending the AT commands. When you send AT commands for example: 'ATr' you should receive back a reply from the SIM800 modem saying 'OK' or other response depending on the command send.