I have 3 Midea Blanc A/Cs in the house with wifi modules. They seem to be slightly different models.
I can confirm that after adding the HACS integration to my hass.io setup on RPI3B+ I get similar initial results - the A/C in the living room was already started with remote however in HA it is not shown as active while in the Midea app it shows up properly (I’m using this app: https://play.google.com/store/apps/details?id=com.midea.aircondition.obm).
For the A/C in the office I had to do a new pairing via the Midea app and after this was done it went from unavailable to showing the external temperature properly (the other 2 A/Cs are just showing 17 C).
I would be happy to do some more testing to make this work better, more reliable.
One thing I’m missing from HA is the ECO button (this is available in the app and on the remotes as well for all 3 systems), I usually run the A/Cs set to 24 C and ECO enabled when cooling the house.
Edit: while writing this post I lost control of the office A/C as well… I’m new to HA but I’m open to any suggestions on how to make this work!
Edit2: correction, I did not loose control, rather the command to turn it on took much longer than expected - by the time I finished my first edit the office A/C started up. Now I turned it off and it takes more than 10 seconds for the command to go through! Compared to the IR remote and the app this is more than I expected!