I personally feel, they made it the wrong way. Just the pressure the open source community put on the company, the bad headlines in the tech magazines etc. have lead to change it back and re-enable the api.
Initially they seemed not having the intention giving us the local access to our paid devices back.
We have to be grateful to the the open source community and home automation enthusiasts which created that pressure.
Logitech just released a firmware 4.15.210 that re-enables the API. They say they don’t recommend it but you have the option to get back to business. (Alt + F9 -> scroll down the page to the last option “Firmware to enable XMP”).
It works now!
I was travelling for one week and got back and found my hubs not working anymore. OK, found the temp solution to install dev firmware, good. But then I wasn’t able to install harmony desktop software because faulty installer and wrong file permissions to AppFiles.zip
This fixed it for me (scroll to the bottom, last posting)
I can confirm this too. Works like a charm after activating the developer Firmware! Thanks for pointing that out! As this is the latest firmware, deactivating internet access should not be necessary either. Seems to be the best workaround in the moment.
Installing the developer version 4.15.210 worked for me also. Downgrading to the version prior to .206 was driving me crazy as my system kept automatically “upgrading” me to .206, which of course I didn’t want… Since .210 is a higher level, the upgrade process is now leaving me alone!
Logitech - Smart Home Group
Edited December 21, 2018 at 7:20 PM
“If you would like to participate in an XMPP beta program, which will allow access to local controls, see the below instructions. Over the coming weeks, we will qualify a regular firmware release that still allows XMPP control for those who need it. We expect to send out an update that will be available to all Harmony customers in January (2019).”