 once this count has been reached, the node can be configured to send a message for each subsequent message
    received.</p>
    <p>A <i>timeout</i> can be set to trigger sending the new message using whatever has been received so far.
     This timeout can be restarted by sending a message with the <code>msg.restartTimeout</code> property set.</p>
    <p>If a message is received with the <code>msg.complete</code> property set, the output message is finalised and sent.
    This resets any part counts.</p>
