expntly

mavlink_message_t message;
mavlink_landing_target_t ds;

ds.time_usec = 0;
ds.target_num = 0;
ds.frame = MAV_FRAME_BODY_NED;
ds.angle_x = 0.0;
ds.angle_y = 0.0;
ds.distance = 0;
ds.size_x = 0;