&lt;message id=&quot;&quot;&gt;
  &lt;gcm xmlns=&quot;google:mobile:data&quot;&gt;
  {
      &quot;from&quot;:&quot;REGID&quot;,
      &quot;message_id&quot;:&quot;m-1366082849205&quot;
      &quot;message_type&quot;:&quot;ack&quot;
  }
  &lt;/gcm&gt;
&lt;/message&gt;

&lt;message id=&quot;&quot;&gt;
  &lt;gcm xmlns=&quot;google:mobile:data&quot;&gt;
  {
      &quot;from&quot;:&quot;REGID&quot;,
      &quot;message_id&quot;:&quot;m-1366082849205&quot;
      &quot;error&quot;: ERROR_CODE,
      &quot;message