Direction control state

$enum.direction_control_state:description$

Constants

enum.direction_control_state.A_TO_B

A to B is allowed, B to A is not allowed

enum.direction_control_state.BOTH

A to B and B to A are allowed

enum.direction_control_state.B_TO_A

B to A is allowed, A to B is not allowed

enum.direction_control_state.NONE

A to B and B to A are not allowed