cookbook • flow control• trigger at interval

Trigger a flow at regular intervals

Problem

You want to trigger a flow at regular intervals. For example, to periodically call an api to retrieve its current state.

Solution

Use an Inject node configured to repeat at the desired interval.

To stop - you must re-configure the node and set Repeat to none. Click done to save the change and deploy.

Example

[{"id":"372cfc32.bcd244","type":"inject","z":"535331d8.55c1f","name":"","topic":"","payload":"","payloadType":"date","repeat":"5","crontab":"","once":false,"x":150,"y":600,"wires":[["6c63c499.ce3adc"]]},{"id":"6c63c499.ce3adc","type":"debug","z":"535331d8.55c1f","name":"","active":true,"console":"false","complete":"false","x":410,"y":600,"wires":[]}]

Discussion

The Inject node can be configured to repeat at a fixed interval. If desired, it can also be constrained to do so between certain times on certain days.

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Node-RED: Low-code programming for event-driven applications.

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