Auto disable wifi and a few more tweaks

[zeraien]

• Automatically disconnects wifi until an "admin" card is read in by the user. Default is to keep wifi on unless configured otherwise.
• Add automatic restart setting, to lessen risk of memory leaks and crashes.
• The wifi network created will have the same name as the "hostname", in case you have multiple units nearby
• Also some minor tweaks to web interface.

[omersiar]

Thank you. Nice job 👍

[zeraien]

Thank you for starting the project :)

[omersiar]

• Bug first time flashed missing deviceHostname [ INFO ] Configuring access point... Failed!

[zeraien]

Argh, I tested it and on my device it just used the default hostname of the esp8266 from before, but I can put in a default.

…

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[klasrocket]

Hi. Nice work!

Whats needed to actually turn off the rf chip and gain power savings is both

WiFi.disconnect(true); and
WiFi.forceSleepBegin();

as far as I understand, according to following discussions:
esp8266/Arduino#644
esp8266/Arduino#460
https://www.hackster.io/rayburne/esp8266-turn-off-wifi-reduce-current-big-time-1df8ae

But not sure it's easy to bring it back up again, so I simply just used a button physically connected to reset.

Would be nice to avoid wlan shutting down if its used though, will look into that.

[zeraien]

The problem is that as it stands, the forceSleepBegin can not be reversed without powercycling the device, which is a problem if you do not wish to, or can not powercycle it at will. But as I understand it, it is a feature that should work so hopefully it will be fixed in future versions of the esp8266 code.

[omersiar]

I always wanted the rfid hardware to be interrupt driven. All this bit banging beyond me, maybe rfid hardware can trigger reset, but we need atmel like wake up function.