But it sounds like you haven’t looked. I found one (older) topic in about 5 seconds… and I am not even interested in (nor have) a DFplayer board. And any issues seemed to be related to the player library, or users programming abilities, not Blynk.
However, I HAVE (as have many others) used many other discrete devices and their controlling libraries AND interfaced them with Blynk, so we know it can work.
If someone wishes support… we recommend one put some visible efforts into it, not just demand answers.
I wish I had thought of that one… oh, wait… 
