* Update MQTT broker docs for clarity
Adding words to note that the reason a "run your own" broker is the most private is because the embedded broker doesn't support TLS/SSL.
Also updating to use the new configuration tags.
* Update to reference hbmqtt supporting TLS
Owntracks for be convinced to talk the correct protocol version (Protocol Level 4; MQTT 3.1.1) by setting it manually in the configuration JSON.
I have tested this against my own Hassbian install (0.47.0).
See the ticket that added the feature here; https://github.com/owntracks/ios/issues/444