Precision Landing with OpenMV in Copter V4.30

I am trying to achieve precision landing of quadcopter . I am using openmv H7 hardware with the default camera and its example code which send landing_target mavlink message. I am setting PLAND_TYPE = 1 and PLAND_ENABLED = 1.
But My Copter can’t display mavlink messages.Is there anything that needs to be changed in the new version of Copter?