Add usage message for UART address in main function

src/main.c

@@ -6,6 +6,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <termios.h>
+#include <string.h>
 
 #include "users.h"
 #include "tui.h"
@@ -19,13 +20,19 @@ void *uartListener(void *arg)
         perror("Failed to open UART");
         return NULL;
     }
-    
+
     close(uart);
     return NULL;
 }
 
-int main(int argc, char const *argv[])
+int main(int argc, char const **argv)
 {
+    if (argc != 1)
+    {
+        printf("Usage: %s <Address of RFID reader>\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+
     int y_max, x_max;
     char uart_address[51];
     pthread_t uart_thread;
@@ -51,7 +58,8 @@ int main(int argc, char const *argv[])
     erase();
     refresh();
 
-    uartDialog(uart_address, x_max, y_max);
+    // uartDialog(uart_address, x_max, y_max);
+    strcpy(uart_address, argv[1]);
 
     pthread_create(&uart_thread, NULL, uartListener, uart_address);