MQTT data via Node-Red To Blynk to controll NodeMCU connected hardware

[PeteKnight]

@Soiski

But as nodemcu can not handel two connection (to MQTT and BLYNK) in the same time

Yes it can, see this example:

My home automation projects built with MQTT and Node Red

Part 5 – MQTT Code For Your ESP8266 Devices I wasn’t very happy with the MQTT code that I’d been running on my devices, so decided to revamp it before sharing. Then I got a got a bit carried-away and added a few too may bells and whistles to make it usable for most situations. I’ve now created a cut-down version of the code, which may still contain too many features for some people, but at least they are fairly easy to remove if they aren’t needed/wanted. The code is designed to be used with …

But, that doesn’t answer your question.
If I understand your problem correctly (and I’ve tried your code and what I think you used as the Node-Red flow and re-created the issue) then you need to use the Bridge node.

Here’s the Bridge Node setup, with the same auth code as you used in your connection:

Serial Monitor output:

TEST:512
CO2 Data:336
TEST:336
CO2 Data:580
TEST:580

The display widget in the app attached to V6 also gets updated.

BTW, when you post code it needs to be surrounded by triple backticks so that it displays correctly, and the quotation marks don’t get corrupted when you copy/paste it into the Arduino IDE.
I fixed it6 for you this time, but in future please add the triple backticks yourself at the beginning and end of the code.
Triple backticks look like this:
```

Pete.