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Click the first device
to connect the Bluetooth.
Connected, built-in LED on the Bluetooth module is normally on. APP interface will
show the state connected.
On the bar enter letter a, and click to send, APP will print out the character
"keyestudio" and D13 indicator on the UNO R3 board will flash once.
Continue to send the letter a, APP prints out multiple "keyestudio" characters and
D13 indicator flashes.
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