This kind of thing actually got added to a Microcontroller and its native SPIN language. There is "SEND" which can be used as an ad hoc comms channel, aimed at

This kind of thing actually got added to a Microcontroller and its native SPIN language. There is "SEND" which can be used as an ad hoc comms channel, aimed at a program method. And a debug system that can both stream data, text and graphics to a client, as well as capture and report on the state of the 8 CPU cores possibly running. https://www.parallax.com/propeller-2-graphical-debug-tools-in-spin2/ https://www.parallax.com/propeller-2-graphical-debug-tools-i... The debug output is something like using an xterm with Tektronix emulation turned on, and with all the lower level bits packaged away. The use can do a lot, from a "print" type operation to sophisticated graphics, static or animated. On the capture side, a sort of supervisor region of RAM is reserved to for an ISR to capture processor state, or anything in memory really. Can be time, or event driven.