@Override

  public void connected(NodeConnection remoteCon) {
    ApplicationMessage message = null;
    message = new ApplicationMessage();
    ResquestType serializableContent = new ResquestType();
    serializableContent.fromPeriod = "2013-10-21 01:00:00"; // From when you desire the messages ...

    serializableContent.type = "gmessage"; // Specifying the kind of message, this is the default kind.
    serializableContent.group = 2; // GroupDefiner group code or -1 for messages sent for all clients.
    
    message.setContentObject(serializableContent);
    try {
      remoteCon.sendMessage(message);
    
}
    catch (IOException e) {
      e.printStackTrace();
    }
  }