text: #ifndef HAVE_TL_SERIAL_H
  #define HAVE_TL_SERIAL_H
  
  #include <glib.h>
  
  gboolean tl_serial_init(const gchar *port);
  void tl_serial_uninit();
  
  void tl_serial_request_shutdown();
  void tl_serial_power_on_time_set(gint64 time);
  void tl_serial_power_on_daily_set(gint hour, gint minute);
  void tl_serial_gravity_threshold_set(guint8 threshold);
  
  #endif
  