no response for mdns circuitpython.local

[davs2rt]

CircuitPython version

Adafruit CircuitPython 8.2.9 on 2023-12-06; Seeed Studio XIAO ESP32C3 with ESP32-C3FN4
Board ID:seeed_xiao_esp32c3
UID:43588170B08D

Code/REPL

http://circuitpython.local does not respond MDNS

Behavior

I have 4 Seeed Studios Xiao ESP32C3 processors on the network, running 8.2.8 and 8.2.9. When I attempt to get to get to http://circuitpython.local or /code/ I get a timeout. Wireshark shows no response to MDNS request packets. The attached file is a pcapng, renamed to .txt. mdns_timeout.txt

Description

Possible clues:

• This originally worked on all 4 devices using 8.2.8, got harder to make a connection, then eventually failed everywhere.
• It fails from Linux Mint, Windows 10, Firefox, Chrome.
• I upgraded from 8.2.8 to 8.2.9 to see if it mattered: no. Device failed to respond to mdns request on with a clean install.
• Device works for outbound connections to access ntp servers, mqtt server/broker using asyncio.
• Device only rarely responds to pings.
• As the ESP32C3 doesn't support a file system over USB, my only other workflow is using http://10.1.99.2/fs/ to push files to the device, which works sometimes.
• USB serial is pretty reliable
• Running asyncio. I considered that asyncio was interfering with the web response, but it also failed on a fresh install, no asyncio.

Additional information

I'd be happy to develop additional debugging data, but I'm lost on what to look at next.

[dhalbert]

This sounds at first hearing like obsolete DNs entries being cached on the host computers or the routers, but given the non-response to mDNS packets, Iam not so sure.

If you wipe the flash on the C3 and the reinstall CircuitPython and the test setup, does it work again?

[davs2rt]

Solved: user error.
I had set the settings.toml keywords incorrectly. e.g.
CIRCUITPYTHON_WIFI_SSID = "redacted"
CIRCUITPYTHON_WIFI_PASSWORD = "redacted"
which kills the web workflow at
circuitpython/supervisor/shared/web_workflow/web_workflow.c line 269