Many Espressif devkits (ESP32-C6-DevKitC-1) include a UART USB bridge, usually the Silicon Labs CP2102N.

Most of the chips (ESP32-S3, ESP32-C3, ESP32-C6) in these devkits can support USB serial communication (standard USB CDC-ACM) easily without use of any other hardware, so it seems like adding a ...

I'm trying to use the set default construct in my Kconfig.projbuild file, but getting the error esp-idf kconfig error couldn't parse set default syntax error .

The set default construct is defined in the online Kconfig documentation :

set_default ::= "set default" + assignment [+ "if ...

You're right that it's not enough to simply wait for a USB connection to happen. That is easy to detect (see the two methods previously reported) but does nothing to ensure terminal emulation is executing.

have the terminal send some special sequence when it is connected and ready to be queried ...

I think you are correct, the author of this example probably doesn't intend for runtime to execute without warnings or errors.

you can call linenoiseSetDumbMode(0) later to enable "smart" mode again

Another idea is to detect the USB connected state, and wait to run the console component until ...

The $ idf monitor command always properly used escape codes, and did not exhibit the problem stated here. I have not been using that command much, in order to focus on the standard terminal applications most typically used like Winterm, Putty, Screen, Cu, Minicom, and similar.

Update

While ...

If the ESP-IDF console component performs a check to see if the monitoring terminal application responds properly to an escape-coded request, then I wonder how the example can ever run correctly. I mean, unless the example code waits until a USB connection is detected, it would issue the check logic ...

I'm running the examples/system/console/basic application on a custom board using the ESP32-C3. This board connects a USB Type C connector the the standard GPIO18 and GPIO19 of the MCU without any UART bridge IC. This example application uses the console and linenoise components.

ESP32-C3 ...

It appears this problem is solved by pull request https://github.com/espressif/idf-extra- ... /pull/644/.

Thanks @nopnop2002 your comments may help. The compile problems are solved in bug report 641 on the IDF extra components repository, but now we are trying to get the example to work with the USB console. It was hard coded to use UART0, which is not always easy to access.

https://www.github.com ...

Has anybody used the esp_cli component as instructed on the page:

https://components.espressif.com/components/espressif/esp_cli/

...because the example code there calls functions that don't exist, and of course fails to compile. Seems like a sloppy job at component development but the author ...