Wow, looks like you made great progress since I’ve been here last time.
Answering some questions:
1. I’ve never tested firmware without RTC however if a bug is present it should be also for ESP8266 (or is in ESP32 NTP library)…
2. I do consider porting the last MQTT version also, however I wait till the final version will be released with MQTT subscription
3. @argita what RTC bug are you referring too ? If you have a spare board I would be interested…
BR