How to Interface stm32f401 and sim900a gsm module for receiving sms
it seems the communication is realized over UART and AT-Commands, so the ATCmdParser API is probably good choise.
ATCmdParser - API references and tutorials | Mbed OS 6 Documentation
Otherwise Search - Sim900a
Thanks for the response. I referred the material and implemented in mbed compiler. I could able to read the incoming message as +CMT: “phone number”. But, I did not know how to extract the sent message.