[iaqualink] Zodiac Hydroxinator always shows as OFFLINE

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Current Behavior

Always shows up as OFFLINE. If I visit https://iaqualink.zodiacpoolsystems.com/signin?lang=en, then it also shows up as offline. If I use the iaqualink mobile app, it works fine.

Investigation

I looked a little deeper and for my device at least, the app uses a completely different mechanism to communicate with the device. Whilst it starts off with the same REST API, it diverges quickly in the authentication mechanism, then switches to AWS MQTT to control and monitor the device.

Implementation

I am currently adding to the binding to support Hydroxinators (and most likely all modern Zodiac systems?). I am doing this as a distinct handler type in the binding. I should have a PR soon.