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Change status of button

I am using some physical buttons to turn on some bulbs but I also use the blynk app button to turn on the same bulb. How can I change the status of the app button with the physical button?

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β€’ Arduino Mega with Ethernet Shield
β€’ Smartphone OS (iOS or Android)
β€’ Blynk server

Look at the Sync Physical Switch example in sketch builder.

Pete.

Thanks You!