how to create a real time Simulink transfer block

I have a simple idea but I guess it's hard to implement it on simulink. I created a TCP/IP server between a BeagleBone and a simulink block using C code. I have a switch connected to the beagle bone as an input and my idea is to have a display on the simulink block showing if the switch is close or open. I couldn't do it because my client(simulink block) is a c code and it will do the job only once as C code ends the function execution after return to get the value of the switch. Do you guys know any simulink transfer mode or fancy C tip to transfer data between the Simulink client block and the display ?