Programically control mqtt in and mqtt out nodes

General
,
1

In my flow, I set an Interval and I send message from mqtt out node repetitiously.
Now I want to stop sending programmatically without re-deploy Node-RED.
How can I do this?
How can I manage mqtt in/out nodes connections?

2

a simple-gate node?

3

Or if you read the help text you will see dynamic connection details.
[edit] if running latest node-red 3+

4

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