Keyestudio EASY PLUG Ultimate Starter Kit Manual page 83

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Then set the baud rate to 9600, enter an "R" and click Send, you should see the RX
led on the board blink once, and then D13 led blink once, finally "Hello World!" is
showed on the monitor, and TX led blink once.
Congrats! Your first simple program is complete.
Note:
In this project, we take Arduino code as an example to show Hello World.
But in the following projects, we will take Mixly Code as example to start the
experiments. It will be more simple and easier for you to get understand of the
program.