More information on TFT display + TFT backlight timeout

[kimble4]

I expect the entire TFT UI will be re-done at some point, but as an interim measure this adds some more useful information to the display:

• Dedicated icon for the vehicle connection status, like in the Web UI.
• WiFi connection status icon (artwork is a bit rough and ready) that also indicates whether in station or AP mode.
• The actual power/current being drawn by the vehicle, and the supply voltage (which can be updated in realtime by MQTT).
• The EVSE temperature.
• Current limit has shrunk a bit to fit this all in.

I've also changed the date format to ISO8601; in the absence of any localisation this is considerably less confusing for non-American users.

Meanwhile, setting TFT_BACKLIGHT_TIMEOUT_MS enables a timeout of the TFT's backlight. (Value is in milliseconds, so 600000 = 10 minutes.) The backlight will wake automatically when the EVSE or WiFi connection state changes, or if a message is displayed.

If TFT_BACKLIGHT_CHARGING_THRESHOLD is set, the display will timeout during charging if the current drawn drops below the set value in Amps.

[clowrey]

Beautiful! 1000% want

[jeremypoulter]

Thanks for the contribution, this is a good improvement. I will do a proper review. Indeed the intention is to move over to a proper framework but we have some other changes to do first.

[jeremypoulter]

@kimble4 Changes look good, and tested, looks to work well.

Maybe one thing to consider,
Instead of

#ifdef ENABLE_SCREEN_LCD_TFT
  _lcd.setWifiMode(true, false);
#endif //ENABLE_SCREEN_LCD_TFT

Maybe just define an empty method in the on TFT to get rid of the #ifdef

Do you have any other plans to add more changes?

[kimble4]

That's a good idea; wasn't sure which was the less invasive change to make.

I don't have any plans to add to this, but I didn't last week either :) Happy to draw a line here and start a new branch if I think of something else to add.

Longer term things like localisation, colour themes, maybe some graphs or displaying the history or whatever are best left for a proper framework. But it's really nice to be able to see the current and (particularly for portable use) what the WiFi is doing.

[jeremypoulter]

Yeah I agree. I am refreshing the networking layers at the moment but a framework is next on my list, probably LVGL but lib Websockets also looked good