MissionPlanner.MAVLinkInterface.setNextWPTargetAlt C# (CSharp) Method

        public void setNextWPTargetAlt(ushort wpno, float alt)
        {
            // get the existing wp
            Locationwp current = getWP(wpno);

            mavlink_mission_write_partial_list_t req = new mavlink_mission_write_partial_list_t();
            req.target_system = MAV.sysid;
            req.target_component = MAV.compid;

            req.start_index = (short) wpno;
            req.end_index = (short) wpno;

            // change the alt
            current.alt = alt;

            // send a request to update single point
            generatePacket((byte) MAVLINK_MSG_ID.MISSION_WRITE_PARTIAL_LIST, req);
            Thread.Sleep(10);
            generatePacket((byte) MAVLINK_MSG_ID.MISSION_WRITE_PARTIAL_LIST, req);

            MAV_FRAME frame = (current.options & 0x1) == 0 ? MAV_FRAME.GLOBAL : MAV_FRAME.GLOBAL_RELATIVE_ALT;

            //send the point with new alt
            setWP(current, wpno, MAV_FRAME.GLOBAL_RELATIVE_ALT, 0);

            // set the point as current to reload the modified command
            setWPCurrent(wpno);
        }