After a successful connect via SDK-cached credentials (Try 1) or the
WiFiManager captive portal, only the SSID was saved to EEPROM. On the next
boot config.password was empty, so setupWiFi() and the reconnect loop called
WiFi.begin(ssid) as if the network were open and failed with
WL_WRONG_PASSWORD.
v1.9.6 masked this: with an empty password the retry loop fell back to a
bare WiFi.begin(), which reuses the SDK-stored credentials. Commit 02834ba
(v1.9.7) replaced that fallback with WiFi.begin(config.ssid), and v1.9.9
(M2) added the same call to setupWiFi(), so every version after 1.9.6
never reconnects after a reboot when the device was set up through the
portal.
Read the password back with WiFi.psk() and store it next to the SSID in
all three places that sync the SSID. Devices already in this state recover
by entering the password once in the web UI (fallback AP after ~2.5 min).
Verified: builds with PlatformIO (espressif8266 core 3.1.2, esp01_1m).
Fixes#12
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
