Three weeks ago, I published an article about simple serial communication from a Nextion HMI towards an Arduino, so that the latter could handle 25 buttons on a screen with only a handful of code lines. This was intended to show that for many simple use cases, there is often no need for using a complex library and the Nextion protocol with its variable message lengths and the famous 3 x 0xFF terminator. The week after, I went on, this time showing a simple event handler for the Arduino, so that it could process events auto-generated by the Nextion, just by enabling the "Send Component ID" case for all components. Since then, we were bound to the Nextion return data format, the Arduino side code was somewhat more complex but still shorter and simpler than using a library. Nevertheless, it seems that did not so much trigger the interest of you, my dear readers, the click rate was only about 60% of the article before. From which I conclude that you prefer simpler solutions... Lets get back to a more basic approach, allowing to simplify things by sending only two bytes, a command byte and a data byte, and make it fool- and accident-proof without a terminator sequence.