--- /dev/null
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/select.h>
+
+char const *door_dev_="/dev/ttyUSB0";
+