Improve MQTT

[Minims]

• Improve device data in MQTT integration
• Does not retain camera config by default.

[roleoroleo]

I can't test it now, because my yi_home is down.
But a couple of questions:

• Is get_system_config() necessary? It seems she's never called
• Line 91: variable HTTPD_PORT is empty (maybe it requires get_system_config()?).
• Line 92: echo $DEVICE_DETAILS. Is it a typo?

If I can restore the cam tonight I will test it.

[roleoroleo]

We should shed some light on the mqtt world.
There is a big overlap between mqttv4+mqtt-config and mqtt_adv_homeassistant.sh.

[Minims]

• Is get_system_config() necessary? It seems she's never called
• Line 91: variable HTTPD_PORT is empty (maybe it requires get_system_config()?).
• Line 92: echo $DEVICE_DETAILS. Is it a typo?

I have fixed those 3 things :-).