node-red/packages/node_modules/@node-red/nodes/locales/en-US/sequence/19-batch.html

<!--
  Copyright JS Foundation and other contributors, http://js.foundation

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->

<script type="text/html" data-help-name="batch">
    <p>Creates sequences of messages based on various rules.</p>
    <h3>Details</h3>
    <p>There are three modes for creating message sequences:</p>
    <dl>
        <dt>Number of messages</dt>
        <dd>groups messages into sequences of a given length. The <b>overlap</b>
        option specifies how many messages at the end of one sequence should be
        repeated at the start of the next sequence.</dd>

        <dt>Time interval</dt>
        <dd>groups messages that arrive within the specified interval. If no messages
            arrive within the interval, the node can optionally send on an empty message.</dd>

        <dt>Concatenate Sequences</dt>
        <dd>creates a message sequence by concatenating incoming sequences. Each message
            must have a <code>msg.topic</code> property and a <code>msg.parts</code> property
            identifying its sequence. The node is configured with a list of <code>topic</code>
            values to identify the order sequences are concatenated.
        </dd>
    </dl>
    <h4>Storing messages</h4>
    <p>This node will buffer messages internally in order to work across sequences. The
       runtime setting <code>nodeMessageBufferMaxLength</code> can be used to limit how many messages nodes
       will buffer.</p>
</script>