Yes, I agree, I don’t understand that they don’t have a backup. Many people write here that it doesn’t work since Thursday, April 18, this only applies to air conditioners, heat pump monitoring doesn’t work since April 16.
I’ve been doing a bit of research on the architecture of MelCloud. I found out that this solution originally came from 2004, when they developed application for Windows (they did not release this application), then released only WEB browser variant. Subsequently, as mobile applications spread around 2009, they began to cooperate with many universities and subsequently with the SW company OneAdvanced from the UK (this company developed MelCloud as B2B partner for MITSUBISHI). The first commercial MelCloud as part of air conditioning and heat pump solutions was created in 2011 for high end units. Android, IOS and Windows client applications were gradually released. Since 2014 also available for cheaper series of units.
They addressed this requirement by making use of the capabilities of Microsoft SQL Server Enterprise Edition to organize servers into Always-On availability groups, and by using de-centralized PCIe-based SSD storage. They developed their own web-services using the .Net MVC framework both to communicate with the hardware devices and with the control applications. The control applications were developed using the Adobe Phonegap platform which allowed them to write a single codebase that supports all major mobile platforms.
Now MITSUBISHI is preparing a new cloud solution (Mel Cloud Commercial - a paid application at the end of Q2/2024) and subsequently the new Mel Cloud Basic, which is to replace the existing one in Q3/20204.
At the same time, they won an EU research project: Demand-response Demonstration Experiment with Heat Pumps Begins under EU “REACT” Project:
In my opinion, the fact that they had originally subcontractors for the existing solution and now they are preparing a new solution (I found out that they have built their own team for it) and are still solving research projects may be the answer to what is actually happening.