Normally, I design my projects first on paper with a pencil until I have an overview over the required specifications, before I finally order the materials accordingly, a powerful enough MCU and a Nextion HMI with the needed size and resolution. But this Easter weekend, I sat there and thought about the Nextion 4.3" Standard HMI which I have had in a drawer for a very long time. And I thought for myself: "After all, developing and debugging Nextion based projects need sometimes a few extra tools. But I'm not always comfortable with going through all drawers to find the TTL-to-USB adapter, launching the Windows Computer which I use rarely, since besides Nextion development, I'm a Mac addict, launching the Nextion Editor, load the project, launch the Simulator, establish a serial connection, and, and, and..." Finally, I found that having a separate serial monitor on the bench to visualize either data sent out by the MCU towards the Nextion or by the Nextion towards the MCU would be a nice thing. At the same time, a new blog article should be published, so I decided to combine this with a "lesson" about a seldom mentioned advanced Nextion functionality: Protocol reparsing, which is available on all series, Standard, Enhanced, and Intelligent and which allows to circumvent the firmware and to take the control over the incoming data stream.