Redundant info printed everytime a script is started

[jetpax]

Each time a script is run using the RUN button redundant information is printed before and after

eg

MicroPython v1.26.1-dirty on 2025-10-07; Generic ESP32S3 module with ESP32S3
Type "help()" for more information.
>>> 
raw REPL; CTRL-B to exit
>OKHello, MicroPython!
>
MicroPython v1.26.1-dirty on 2025-10-07; Generic ESP32S3 module with ESP32S3
Type "help()" for more information.
>>> 

Expected would be only to print banner on start up, and on each script run only

Hello, MicroPython!

cf ESP32 MPY-Jama

[ubidefeo]

@jetpax
currently all the stream over the serial port is handled by a buffer that is shared with the x-term instance.
I have a branch I've been working on to filter what goes in and out, but it's not stable/reliable yet.

Definitely adding this as a feature request, hope I can spend some time on it once I finish other more urgent tasks.

Thank you for pointing this out :)

[Josverl]

For the ESP boards I see this as an indication that the board has restarted for some reason, likely a spike/change on the DTR/RTS lines

[ubidefeo]

@Josverl
The board is not reset on Run, I use ESP32 a lot, can you elaborate on your thoughts? :)

[Josverl]

Look in the MicroPython repo for the fixes in Mpremote serial by me and @projectgus to avoid DTR/RTS spiking on Windows, and thereby inadvertently resetting MCUs , or dropping then unintentionally into bootloader.

To see it in action hook up a logic analyser to the UART and DTR RST pins.
And then do what you do normally.

As an example, before my initial fixes stopping more more caused all ESPxxx boards to reset.
Due to timing That only showed up in scripting, not in manual test, and the assumptions were human error, or bad drivers.
Reality was that the root cause was that Windows serial ports follow the same logic and conventions as linux, so essentially an in compatibility that pyserial does not solve or bridge.

This is not limited to Python though, Ive worked on similar patches for Java and Electron native serial ports.

[projectgus]

FWIW, it could be DTR/RTS triggering hard reset but then I'd expect to see some of the ROM bootloader log in the output as well. Are you opening and closing the serial port when this happens?

My first thought is this looks like a MicroPython soft reset is being triggered in interactive REPL mode (which prints the banner at the end the soft reset). If you trigger a soft reset in raw REPL mode instead then you won't get the banner (although it still prints something.) Play around with Ctrl-A, Ctrl-B, Ctrl-D in a mpremote or serial terminal to see what I mean.

(Quick look at micropython.js shows that the run method exits raw REPL mode at the end, and the reset method doesn't go into raw REPL mode, which matches my initial hunch although I'm not looking at all closely.)

[ubidefeo]

@Josverl @projectgus
Thank you for chiming in 🙏🏼

If there was a soft reset the state of the VM would be lost.
This is an issue with multiple getPrompt() being triggered, as it enters and exits raw REPL (good hunch).

I find the amount of output annoying myself, but haven't gotten around to resuming my work on that output filtering feature 🥲
Hope I can carve some time out in the next few weeks, taking advantage of the holidays

[ubidefeo]

a quick update on this thread if anyone's following:
I have resumed work on filtering REPL and output to the xterm instance.

right now it seems to be working pretty well, also found a couple bugs on the way, but I'm gonna need to go through the changes with @sebromero to see if it's a good PR.
The refactor is not that big, but new logic has been introduced to add a MITM router and message suppression strategies.

Somehow I'm surprised it's working so well, but still feels a bit like spaghetti-code so not something I want to push in order to maintain some reputation 😆

In the meantime if y'all wanna try 0.22.0, it implements better styling for the REPL and a nice palette in support of ANSI encoded prints (I guess you know where I'm going with this)

thank you for your attention
u.

[ubidefeo]

@Josverl @jetpax
you may wanna test 0.31.0-rc.1

it's a lot of improvements :)

[Josverl]

you may wanna test 0.31.0-rc.1

Yes looks nice.

[jetpax]

Thanks!

I did my own homage to lab-micropython-editor Scripto Studio

[ubidefeo]

@jetpax
thank you for sharing, it looks fantastic! 😃

the PyDirect link in the readme is broken, what's that?