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Gianluca Barbaro fa65783f39 MQTT: Managing binary payloads (#6976)
* Managing binary payloads

Hello,
background: I wrote a HA camera component that gets the image from a binary payload. I'm testing it with Zanzito (https://play.google.com/store/apps/details?id=it.barbaro.zanzito) and it works apparently well: it gets the image and correctly displays it in the front-end.
But I had to make the changes I'm proposing here: the message was being blocked because the utf-8 decoding failed.
As far as I know, the utf-8 encoding is required for the topic, not for the payload. What I did here was try the utf-8 decoding, but even if unsuccessful, it dispatches the message anyway.
Is there anything else I'm missing?
thanks
Gianluca

* Update __init__.py

* Update __init__.py

* Update __init__.py

* git test - ignore

* Should work

* minor fixes

* updated mqtt/services.yaml

* added two tests, modified threaded subscribe

* removing polymer

* requested changes

* requested changes - minor fix

* security wrap around payload_file_path

* services.yaml updated

* removed file publishing

* minor fix
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