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46 lines
2.4 KiB
HTML
46 lines
2.4 KiB
HTML
<!--
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Copyright JS Foundation and other contributors, http://js.foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<script type="text/html" data-help-name="trigger">
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<p>When triggered, can send a message, and then optionally a second message, unless extended or reset.</p>
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<h3>Inputs</h3>
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<dl class="message-properties">
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<dt class="optional">reset</dt>
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<dd>If a message is received with this property, any timeout or repeat
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currently in progress will be cleared and no message triggered.</dd>
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</dl>
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<h3>Details</h3>
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<p>This node can be used to create a timeout within a flow. By default, when
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it receives a message, it sends on a message with a <code>payload</code> of <code>1</code>.
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It then waits 250ms before sending a second message with a <code>payload</code> of <code>0</code>.
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This could be used, for example, to blink an LED attached to a Raspberry Pi GPIO pin.</p>
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<p>The payloads of each message sent can be configured to a variety of values, including
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the option to not send anything. For example, setting the initial message to <i>nothing</i> and
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selecting the option to extend the timer with each received message, the node will
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act as a watchdog timer; only sending a message if nothing is received within the
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set interval.</p>
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<p>If set to a <i>string</i> type, the node supports the mustache template syntax.</p>
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<p>If the node receives a message with a <code>reset</code> property, or a <code>payload</code>
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that matches that configured in the node, any timeout or repeat currently in
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progress will be cleared and no message triggered.</p>
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<p>The node can be configured to resend a message at a regular interval until it
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is reset by a received message.</p>
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<p>Optionally, the node can be configured to treat messages with <code>msg.topic</code> as if they
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are separate streams.</p>
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</script>
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