If you want to use Blynk (which is what this forum is all about) then the best approach is to use a Raspberry PI running Mosquitto as the MQTT broker and Node-Red as the Blynk to MQTT gateway.
If you want to run a setup without using a Raspberry Pi then there are solutions such as this:
I’ve never tried this, as it doesn’t fit-in to what I want to do.
I cant imagine that the same device would be able to successfully run Blynk and this MQTT broker software at the same time.
I suppose you could have one device acting as your broker and another running Blynk and an MQTT client, which acts as your Blynk to MQTT gateway, but why bother.
As far as MQTT clients are concerned, I use this one:
If you’ve not read it already, it might be worth you taking a look at my Home Automation thread, where I’ve explained my Node-Red setup and given some example of how I use Node-Red and MQTT for various tasks:
Pete.