5 1 SCM controls GSM module, why can't I send short messages? urgent

This question is similar to asking: "How to control the launch of atomic bomb with 5 1 single chip microcomputer" unless I make a program to control the launch of atomic bomb with 5 1 single chip microcomputer and send it directly to you. Your GSM module has specific transmission specifications, and you need to design a microcontroller according to the specifications of GSM module. You should at least know whether the hardware interface of GSM module outputs standard TTL level, whether the hardware interface of GSM module enables function port, whether the hardware interface of GSM module uses serial communication, whether the hardware interface of GSM module uses 9600bps, N, 8, 1 or other transmission formats, and whether the software protocol of GSM module uses standard SMS AT command. .........