title: DroneKit :Changing groundspeed in AUTO mode/ implementing "MAV_CMD_DO_CHANGE_SPEED"
body: <p>I need help figuring out how to set groundspeed in AUTO mode (which is apparently implemented with the Mavlink command "MAV_CMD_DO_CHANGE_SPEED"—but I can't find any examples of this). What I thought would work:</p>
  
  <pre><code>vehicle.commands.add(Command( 0, 0, 0, mavutil.mavlink.MAV_FRAME_GLOBAL_RELATIVE_ALT, mavutil.mavlink.MAV_CMD_DO_CHANGE_SPEED, 0, 0, 1, 0.25, 0, 0, 0, 0, 0))
  </code></pre>
  
  <p><em>Based off of:
  <a href="https://pixhawk.ethz.ch/mavlink/" rel="nofollow">https://pixhawk.ethz.ch/mavlink/</a>
  and 
  <a href="https://github.com/mavlink/mavlink/blob/master/message_definitions/v1.0/common.xml" rel="nofollow">https://github.com/mavlink/mavlink/blob/master/message_definitions/v1.0/common.xml</a></em></p>
  
  <p>But it does not work.</p>
  
  <p>Can anyone help me out?</p>