Multi AP setups: OMG won't roam to other AP when original gets offline

[chris-heo]

Describe the bug
In multi-AP setups (same SSIDs and Passphrases for all APs), OMG seems to stick to an AP and won't connect to another one if it turns off

To Reproduce
Steps to reproduce the behavior:

1. Startup OMG with all APs visible
2. Disconnect power from AP (Ctrl+F "##### AP disconnected from power #####" in log)
3. OMG won't connect to other APs with same SSID, only to previous BSSID
4. Connect AP to power
5. OMG connects to original AP

or:
4. restart OMG
5. OMG connects to another AP

Expected behavior
re-scan for WiFi instead to "insisting" on last BSSID or reboot after a given number of fails

Screenshots
omg_ap_reconnect.txt

Environment (please complete the following information):

• OpenMQTTGateway version used (V1.7.0 with some local mods e.g. static config and BME/BMP280: Don't publish data if no sensor is present & hotplugging #2069)
• Libraries:

|-- PubSubClient @ 2.8.0
|-- ArduinoJson @ 6.18.3
|-- ArduinoLog @ 1.0.3+sha.f634509
|-- WiFiManager @ 2.0.14-beta+sha.9f5981e
|-- NimBLE-Arduino @ 1.4.1+sha.b6b8af8
|-- TheengsDecoder @ 1.7.8+sha.6e883d1
|-- Adafruit NeoPixel @ 1.12.2
|-- Adafruit AHTX0 @ 2.0.5
|-- SparkFun BME280 @ 2.0.4
|-- Wire @ 2.0.0
|-- Adafruit Unified Sensor @ 1.1.14
|-- ArduinoOTA @ 2.0.0
|-- DNSServer @ 2.0.0
|-- EEPROM @ 2.0.0
|-- ESPmDNS @ 2.0.0
|-- Ethernet @ 2.0.0
|-- FS @ 2.0.0
|-- HTTPClient @ 2.0.0
|-- SPI @ 2.0.0
|-- SPIFFS @ 2.0.0
|-- WebServer @ 2.0.0
|-- WiFiClientSecure @ 2.0.0
|-- WiFi @ 2.0.0
|-- Preferences @ 2.0.0
|-- Update @ 2.0.0

Additional context

• Running on ESP32-C3 mini boards w/ framework-arduinoespressif32 @ 3.20007.0 (2.0.7) & toolchain-riscv32-esp @ 8.4.0+2021r2-patch5
• also seeing weird behavior in similar environment: Multiple APs available and visible during bootup but fails to connect. I will file another ticket for that.

[puterboy]

Worst case, it should be rebooting after 12 failed attempts to connect to the broker -- and I know that works properly on my setup, sometimes too well :) (in that it seems to lose connection to the broker, then fails to reconnect, then reboots even when the network is up)
Would be helpful if you monitored serial port and shared logs...

[chris-heo]

I think I found the reason for the behavior - one small detail I forgot to mention:
To avoid manually configuring the gateways, I used the ESPWifiManualSetup, wifi_ssid and wifi_password defines which seem to cause different behavior than using the Wifi Manager UI.
Skimming through the documentation and User_config.h, I couldn't find any other easy way to set build time wifi credentials, is there any way?

For the sake of completeness, please find a log here:
omg_roaming_error_filtered.log