The Firmware is completely based on Sming Framework for ESP8266 and is hopefully easy to use.
I will upload some binaries which you can upload without the compiling.
Formerly i use this firmware and its options for my SmartHome integration with ioBroker from where I script everything i want to control or measure. And it isn't completely ready, so if you want to contribute something ...
Here you can see the Webinterface and where you had to set up your Display
Even the time display is a simple crontab in ioBroker (probably you will use the standard crontab to achieve this) which sends the actual time to the mqtt broker to the corresponding topic which the display listens for new text.
The App i used in the Video is MQTT Dash which you can find on Android Playstore