How to start a periodical task from an external command?

General
1

Hi everyone,
as the title of this topic says, I want to start a periodical task on Node-RED, triggering it from an external command.
I made an Android app and I'm gonna send an MQTT signal from it. When my flow receives this signal, it has to start a task that repeats every 15 minutes. How can I do it?
I obviously can't use the inject node. I tried to use the trigger node, but I managed to repeat the task only twice with it.

2

the cron-plus node is fully automatable.

  • add a cron expression that runs every 15m
  • send a topic of "stop" to it to stop it
  • send a topic of "start" to it to start it

See the built in help on the side bar for more details & see the built in examples (menu, import, examples, cron-plus)

3

how do you have the trigger node configured ? It should be possible no problem.

image
image940Ă—274 5.56 KB

send any payload to start it, and send msg.reset to stop it.

4

Yeah, it should be......I configured it exactly as in your photo, but it doesn't work. I don't know why. I'm testing the cron-plus solution at the moment

5

what about it doesn't work ? It doesn't start ? it doesn't repeat ? It doesn't stop ?
a simple test case is working here...

[{"id":"4c8ef058.e86e9","type":"inject","z":"e9b4dddd.70115","name":"start","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":120,"y":120,"wires":[["a712caf3.34ac68"]]},{"id":"a712caf3.34ac68","type":"trigger","z":"e9b4dddd.70115","name":"","op1":"1","op2":"0","op1type":"str","op2type":"str","duration":"-1","extend":false,"overrideDelay":false,"units":"min","reset":"","bytopic":"all","topic":"topic","outputs":1,"x":330,"y":140,"wires":[["a8cde462.c09df8"]]},{"id":"13e26bd4.352884","type":"inject","z":"e9b4dddd.70115","name":"reset","props":[{"p":"reset","v":"true","vt":"bool"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":130,"y":180,"wires":[["a712caf3.34ac68"]]},{"id":"a8cde462.c09df8","type":"debug","z":"e9b4dddd.70115","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":540,"y":140,"wires":[]}]
1 Like
6

As I said in the topic description, I managed to repeat the flow only twice, using trigger node.
I'll try this flow, maybe I set up something wrong. Anyway the cron-plus node is what I was looking for. The possibility to start, pause, resume and remove the schedules is awesome and very helpful for me.

2 Likes
7

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.