<?xml version="1.0"?>
<block>
  <name>Burst Sink</name>
  <key>gsm_burst_sink</key>
  <import>import grgsm</import>
  <make>grgsm.burst_sink()</make>

  <sink>
    <name>in</name>
    <type>message</type>
  </sink>
</block>