httpd example need a little time sleep before connecting WIFI

[FengChendian]

• Board: pico 2w board

In original httpd example, sleep_ms doesn't exist, and cyw43_arch_wifi_connect_timeout_ms will always return code -7.
If I add some time sleep like sleep_ms(200), it's worked (see "Connected" message with UART Printf). I think maybe cyw43_arch_enable_sta_mode need some time to init hardware.

/////////
    cyw43_arch_enable_sta_mode();

    char hostname[sizeof(CYW43_HOST_NAME) + 4];
    memcpy(&hostname[0], CYW43_HOST_NAME, sizeof(CYW43_HOST_NAME) - 1);
    get_mac_ascii(CYW43_HAL_MAC_WLAN0, 8, 4, &hostname[sizeof(CYW43_HOST_NAME) - 1]);
    hostname[sizeof(hostname) - 1] = '\0';
    netif_set_hostname(&cyw43_state.netif[CYW43_ITF_STA], hostname);


    // sleep
    sleep_ms(200);


    printf("Connecting to WiFi...\n");
    if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {
        printf("failed to connect. error code %d\n", err);
        exit(1);
    } else {
        printf("Connected.\n");
    }
///////

[peterharperuk]

You shouldn't need to add delays. Are you using the threadsafe_background version of the example? How small can you make the delay before it fixes the connect problem? Does 1ms delay have the same effect? Does it fail every time without the delay?