I have a question (or maybe a feature request? 
). I had a TTGO T3_V1.6 with SSD1306 display lying around which works great with rtl433. But I don’t really need the information on the display. Is it possible to somehow display own messages sent via MQTT on it? I imagine for example the most important live data of my weather station or something similar. Would this be very difficult to implement this in the code?
This is technically feasible, you should be able to write your own custom function if you look at the WebUI Module, the code for the formatting display message is there. And the actual routine to display the message on the screen is in the SSD1306 module.