Hi, i just want to add these two values: [grafik] I changed the topic: var temp = (msg.payload[1]) msg.payload = temp; msg.topic = "P1" return msg; but no matter what I do, it doesn't want to add in a function node.

Here is my complete post again - try it & see where you get to... Hi again, as mensioned earlier, this is how you can do it with buffer parser... [image] (obviously I dont have your invertor so all values are simulated - zero) this is the flow i did... [{"id":"3c70a20c.01d53e","type":"inject"…

Thank you, I´ll try it if I get the other problem under controll :nerd_face: Yes, I deleted the function where I tried to add :wink:

I dont get it :frowning: [grafik] [grafik]

I don´t understand why the debug gets alle the values: [grafik] it may get only the one value "PAC2"

What is coming out of the join node?

[ { "id": "ce4d01f7.fa9ea8", "type": "comment", "z": "6a66d831.fbce4", "name": "SB 3000TL-21", "info": "", "x": 640, "y": 700, "wires": [] }, { "id": "e964bad3.ac9098", "type": "comment", "z": "6a66d8…

The reason you cannot add the two values is because these values dont arrive in the + function node simultaneously and one or the other is undefined at that specific time. As Colin suggested further up, you have to join again the values .. so the'll be in the same message and accessible for additio…

aah! but there is a problem with the first join node, i changed to "10": [grafik] now all the values are in "T2"

[image] Becker: but there is a problem with the first join node, i changed to "10" The join node does its job .. waits for 10 messages from the 10 different topics, as defined in the preceding functions, and joins them. And its not in T2 .. its in msg.payload now for the addition issue: add …

Adding two values

General

Steve-Mcl 13 September 2020 09:57 8

Hi @Becker you might be able to simplify things somewhat using node-red-contrib-buffer-parser.

Would you be willing to export your flows in a reply (select all the nodes to export, press CTRL+E) then...
```
paste flow between backticks like this
```

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Adding two values

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