Added MAV_CMD_EXTERNAL_WIND_ESTIMATE to development (mavlink#2122)

message_definitions/v1.0/development.xml

@@ -35,6 +35,18 @@
         <param index="3" label="Reboot">Reboot components after ID change. Any non-zero value triggers the reboot.</param>
         <param index="4" reserved="true" default="NaN"/>
       </entry>
+      <entry value="43004" name="MAV_CMD_EXTERNAL_WIND_ESTIMATE" hasLocation="false" isDestination="false">
+        <description>Set an external estimate of wind direction and speed.
+          This might be used to provide an initial wind estimate to the estimator (EKF) in the case where the vehicle is wind dead-reckoning, extending the time when operating without GPS before before position drift builds to an unsafe level. For this use case the command might reasonably be sent every few minutes when operating at altitude, and the value is cleared if the estimator resets itself.
+        </description>
+        <param index="1" label="Wind speed" units="m/s" minValue="0">Horizontal wind speed.</param>
+        <param index="2" label="Wind speed accuracy" units="m/s">Estimated 1 sigma accuracy of wind speed. Set to NaN if unknown.</param>
+        <param index="3" label="Direction" units="deg" minValue="0" maxValue="360">Azimuth (relative to true north) from where the wind is blowing.</param>
+        <param index="4" label="Direction accuracy" units="deg">Estimated 1 sigma accuracy of wind direction. Set to NaN if unknown.</param>
+        <param index="5">Empty</param>
+        <param index="6">Empty</param>
+        <param index="7">Empty</param>
+      </entry>
     </enum>
   </enums>
   <messages>