Noob trying to get the WiFi examples working

[mairas]

Hello! 👋

I'm fairly comfortable with ESP32-* devices on C/C++ but an absolute, helpless noob wrt. Rust, embedded Rust and especially no_std embedded Rust. So, be gentle. :-)

I'm trying to run the WiFi examples such as wifi_embassy_dhcp, wifi_dhcp and friends. The hardware I'm using is SH-ESP32, based on ESP32-WROOM32E, and HALSER, based on ESP32-C3-MINI-1. Both are my own designs, but for these examples, they should be equivalent to regular Devkit boards.

The initial WiFi scan works in the wifi_dhcp example but both that and the embassy example fail to connect to an AP with WARN - unsafe { esp_wifi_connect() } returned an error: 12298 or errors like WARN - esp_wifi_internal_tx 12290.

I've set the SSID and PASSWORD environment variables and I'm trying to run the examples with cargo xtask run-example examples esp32 wifi_dhcp (and/or esp32c3 and wifi_embassy_dhcp).

Could someone suggest what I'm doing wrong?

[bugadani]

12298 is ESP_ERR_WIFI_SSID (you can see it in esp-wifi-sys). According to documentation:

ESP_ERR_WIFI_SSID: SSID of AP which station connects is invalid

So you should probably triple-check your SSID :)

WARN - esp_wifi_internal_tx 12290

I think you can safely disregard this one. The error code is ESP_ERR_WIFI_NOT_STARTED but otherwise this should be harmless as far as I know.

[mairas]

Heh. Sure enough! :-D

I might've had the SSID variable accidentally unset for a moment but I did re-set it before complaining. I swear!

I approached the issue a bit more systematically and started investigating only the wifi_dhcp example on esp32c3. Once I read the actual scan results:

AccessPointInfo { ssid: "N1", bssid: [...], channel: 11, secondary_channel: None, signal_strength: -42, protocols: EnumSet(), auth_method: Some(WPA2Personal) }
AccessPointInfo { ssid: "N2", bssid: [...], channel: 11, secondary_channel: None, signal_strength: -42, protocols: EnumSet(), auth_method: Some(None) }

I had set the N2 network security to WPA3 which esp-hal clearly doesn't support. Once I downgraded security to WPA2/WPA3, all examples work flawlessly. 🎉