The board Blueduino, which includes both the bluetooth chip CC2540 and the ATmega32U4 chip, is not yet supported by Blynk. It looks like supporting it can be easy as it supports UART transparent transfer.
The problem is that the app doesn’t find the device during scanning.
UUID RX_SERVICE_UUID = 0000fff0-0000-1000-8000-00805f9b34fb
See
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package com.aprilbrother.blueduino;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
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We are filtering supported boards during the scan. Unfortunately, this uart is not in our list of supported hardware. @vshymanskyy could you comment?
We have a working prototype, but it needs additional testing (has stability issues)