Newbie needs help: reading html page, extract value en use to trigger action

General
#1

Hello everyone,

I am a bit new to scripting/programming and everytime i try to learn i stumble to something that seems entirely new and nowhere an answer can be found. As I think that can not be true I ask you for help.

I have Toon (hacked) and using a url i can retrieve the info I am looking for.

I have setup a timestamp node to trigger a HTTP request node. Next i put it trough the json node to convert it to a javascript object. That was what I understood from the documentation.

Now de debug node output looks like this:

object
result: "ok"
currentTemp: "2021"
currentSetpoint: "1550"
currentInternalBoilerSetpoint: "6"
programState: "2"
activeState: "3"
nextProgram: "1"
nextState: "2"
nextTime: "1649880000"
nextSetpoint: "1900"
randomConfigId: "1804289383"
errorFound: "255"
connection: "0"
burnerInfo: "0"
otCommError: "0"
currentModulationLevel: "

I am interesting in only the burnerinfo value, so i can use it to trigger an action. So how i go from here?

I have Node-red running as add-on in Homeassistant, so i want to trigger an action when burnerinfo has for period of time a value of 2.

Hope someone can help...

Thanks!

#2

and nowhere an answer can be found

Are you sure you went through the documentation ?

To grasp the workflow in node-red, i would highly recommend to watch all the videos in this playlist. They are short and explain the most used/useful concepts.

#3

Can you actually do a screenshot of the debug window for the object when you make a request and see the response.

As it is an object - you should be able to hover over it in the debug window and there will be an option to copy the full path

Put that into a debug node and then see if it displays the correct data in the debug window

Craig

#4

here is the screenshot from the debug window of both debug nodes:

afbeelding
afbeelding602×1078 76.8 KB

The second debug is from the change node where i set it to the copied path from the first debug object output.
As you can see it outputs "payload.burnerInfo" but not the value it contains...

#5

You need to set the change node to
set msg.payload
to msg payload.burnerInfo.

you have it set to
set msg.payload
to A/Z (String) payload.burnerInfo.

so select msg in the dropdown list

Screenshot_20220415-073737
Screenshot_20220415-0737371920×1080 127 KB

#6

ooh thanks, I completely overlooked that!