<?xml version="1.0"?>
<block>
  <name>Message File Source</name>
  <key>gsm_message_file_source</key>
  <import>import grgsm</import>
  <make>grgsm.message_file_source($filename)</make>

  <param>
    <name>Source file</name>
    <key>filename</key>
    <value>/tmp/output.msg</value>
    <type>file_open</type>
  </param>

  <source>
    <name>out</name>
    <type>message</type>
  </source>
  
  <doc>
This block outputs gsm messages stored in a file.
  </doc>
</block>