Adding Mitsubishi heat pumps to my electrical heating automation on xTension

[Michel Angelo]

Hello. Some years ago, I joined this happy group around xTension with a project at hand: automating my home electrical heating installation. 

Now I want to add Mitsubishi heat pumps to my xTension herd of controlled devices. 

My heating automation system works happily today through a Vera Plus, from xTension on a 2010 iMac on High Sierra installed in my basement near my home firewall-router and an UPS. 

Construction is under way at home: more square meters and Mitsubishi heat pumps to take the lead over a reduced herd of electric heaters currently managed by xTension. 

On the Vera forum, an old contribution, under "Mitsubishi MelCloud and Vera" (https://community.ezlo.com/t/mitsubishi-melcloud-and-vera/188231/6) seems to say that Mitsubishi does not allow any use of its proprietary APIs.

Upon my questions, my candidate HVAC contractor told me I could access the heating (or cooling) units by wifi through an iPhone app, or talk to it through Google or Amazon Alexa and such. and no more. No interface seems to exist to connect to a Vera. 

None ? Is there any ?

Undeterred, searching the web, I found near a Github repository a recent blog post stating how to hack a Mitsubishi heat pump using an Arduino (each) and a Raspberry PI controlling them all. This blog post provides guidance to those who don't do Github in their normal life, like me. Link to this post: <https://chrdavis.github.io/hacking-a-mitsubishi-heat-pump-Part-1/> 

Is there hope, even remote, to succeed using a raspberry PI and four Arduinos, to control these four Mitsubishi heat pumps with xTension ? 

Or otherwise ? Is there a more straightforward alternative ?

Many thanks in advance for opinions and hints. 

— 
Michel Angelo
<michel_angelo at me.com>