signal sender=:1.0 -> dest=(null destination) path=/com/nokia/osso_hp_ls_controller; interface=com.nokia.osso_hp_ls_controller.headset; member=button_pressed signal sender=:1.0 -> dest=(null destination) path=/com/nokia/osso_hp_ls_controller; interface=com.nokia.osso_hp_ls_controller.headset; member=button_released