RTOS/MSP432E401Y: How to receive AT command response in full from GSM module over UART interface

Part Number: MSP432E401Y

Tool/software: TI-RTOS

Hello Experts,

I have been trying to interface GSM module with MSP432E401.

I am using TIRTOS on CCS.

I see that there are API's like,

UART_write() ;    // To write command to module

UART_read(UARTHandle, rd, 1);

The above read function when used in callback mode, call the callback function after receiving the number of bytes mentioned in third argument. However I do not exactly know the number of bytes in response.

How to handle this situation?

Thanks

/Hp