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[PeteKnight]

No, the server will make the virtual pin changes without any code.

But, if you want your device to do something when the state of the virtual pin changes - like turning a relay on or off - then you need to have a virtual pin handler BLYNK_WRITE(vPin) function in your code and that function must change the status of the relevant physical pin.
The sketch will also require a pinMode statement for the relevant physical pin.

More info on this here…

Using Virtual Pins to control physical devices

I thought I’d write a guide about how to use virtual pins with app widgets such as buttons, to control physical devices such as relays, LEDs etc… Why use virtual pins anyway? I’d always recommend using virtual pins over physical pins when developing your code. There are a number of reasons, but here are what I consider to be the main ones: Virtual pins are hardware independent. This means that it’s far easier to port your code from one hardware platform to another in future (when you realise…

Pete.