Keyestudio EASY PLUG Ultimate Starter Kit Manual page 43

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For example: serial communication
Done uploading the code, open the Arduino monitor, then enter a "hello" on the top bar, and click Send,
it will print out "hello,world".
Wait for the output data completed
Set the software serial port
(call this function if need to use several serial ports)
Event function trigger by serial port data, that is,
serial port is ready to call this function.
(equal to an interrupt function)
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