API with Mitsubishi MELCloud for heatingpumps

[leutech]

You can put JSON string into storage and then use Storage viewer app.

Great, I'll try this. Thanks!

Do you also have an approach for the starting/stopping-issue? 
I think this may be a security/trust-issue and that something in my command may be missing (in the header or in the body part. For example a correct time-stamp in the body part, as shown in the PowerShell-Example), in order to establish a "trusted" connection and successfully send the command to the device, and not only to the MELCloud.