I just updated to the official release and all is working. Docs are pretty good, but you need to follow them carefully. Also you will need to remove bad nest first.
So pay a $5 fee to register a developer account to see our own stats from something we paid hundreds of dollars for 
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It did not seem to bad. I used my google $ earned from answering stupid questions.
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I’m seeing several people are not getting badnest to work anymore.
Any idea if support for this has ended?
I’m hoping to find a free option to connect my nest thermostat to HA.
I can’t speak for the original author, I think the original one was no longer maintained. It was only intended to be a temporary stop gap until the official Nest integration was updated. It now is. It’s not super easy to set up but it’s official.
Also there are forks of the original that might still work.
You can try Homebridge or HOOBS in combination with plugin:
Works reliably and without the Google’s API “fee”. On the other hand 5$ isn’t something what would ruin you. 
The Homebridge plugin is just an alternative with a bit better functionality, for now.
My badnest still worked as of last week. I had to re-enter the password/ cookies from time to time. I felt since the support had stopped and an official version was released a one time payment of $5.00 to Google to access the api was not the end of the world. By the way, I used the Google opinion dollars, so it really wasn’t out of my pocket.
I’ll second that this works perfectly. I had done that already before reading this thread because I saw that using the old Nest API was not supported in HA and I have resisted with all my will to not move to Google’s API and all the baggage that comes with it (as well as the difficulty in setting it up).
I actually got all the way through the Google API setup with the $5.00 fee and getting all the tokens, holy crap what a nightmare, but didn’t actually migrate my Nest to Google - I was saving that as a last resort if nothing else worked.
Having worked with Homebridge quite a bit I decided to see if I could get that to work first, so I spun up a Homebridge instance (takes < 5 minutes), added the Nest and I was fully up and running in HA with my Nest in no time, then used the HomeKit Accessory integration to read in my thermostat and was so happy when everything just worked.
So if you’re like me and just want to avoid Google at all costs, this is a great workaround (until they eliminate the Nest API entirely, and who knows when that will happen). This worked out for me anyway because I have a “backup Pi” around in case something happens to my HA Pi, so this is a good use for it.
How are you accessing the Nest Guard and Nest Detects?
I made an app that acts as a proxy for the Nest devices which gets the data for the devices via a browser and the nest web interface. Take the nest door/window sensors. The app logs into my nest account via the web and then checks the nest website, where you can see all your devices and control them, for their status and relays it via MQTT. You can do the same with Nest Guard and almost all other devices. You can even set the Nest Guard mode via a hacky trick by toggling the nest built-in Home/Away mode. You have to use the hacky trick as there is no proper way to set the Nest Guard mode via the web interface. It’s for security reasons.
I would share it, but I’m not home for many more months and don’t have access to it atm. But if you know how to program, it shouldn’t be hard for you to create this. The selenium webdrivers library makes it very easy to do and is available for many languages, including python.
Hello,
I can read a lot of Github repositories so now, what is the right one to use please?
Because I have the same error as @candleonaflame and I use the following repository: https://github.com/therealryanbonham/badnest
I tried multiple times and ensure token and cookie were correct, putting them in " and without.
I am totally lost with Bad Nest 
I have A Nest Thermostat E (EU) so the only one which won’t be supported by the Nest API unfortunately so I cannot choose the resignation and pay 
Forget about badnest, even the original author dumped it (not to mention some users had issues with NestE via badnest anyway). If you’re not able to use the official integration then try this which i’ve mentioned few post above yours.
Hello,
I have installed and configured Homebridge.
In my Home Assistant integrations, it is displayed as discovered in my network so I click Configure.
After that, the installation progress stays to 50% and never finish.
What do I do wrong?
Of course I did it after succeeding in adding my thermostat.
Can the homebridge method write humidity targets? this is the one thing that badnest has going for it over the new google API.
I am using this ability w/ badnest in order to automate my humidifier attached to my furnace.
@Nardol Unfortunately i use HOOBS so i have no idea, sorry.
@krock Checked my setup and doesn’t look like so. At least homebridge-nest plugin, there is also homebridge-google-nest(haven’t tried this one though).
I still haven’t “migrated” my Nest thermostats to the “new” method. If I do that, will I be required to use this kind of workaround?
No problem, finally I read better the documentations about Nest APIs and all my certitudes fortunately felt, EU thermostats with head link are compatible with SDM (the latest Nest API) so I paid 5$ which looks like to be the price of a really better health for my brain 
I was confusing with the old Works with Nest API which cannot be used with my EU thermostat with head link.
With the Home Assistant Nest Integration I have not the temperature from the head link but it is a good compromise for me.
Had a look at the traits for the new API access, and it looks like they haven’t made any of the hot water controls available though it. So no being able to access boost or change between running on schedule or turning off the water heater functionality of the thermostat via the new integration.
I’m still interested in what Google are doing with the Nest Protects too - no development in ages, they aren’t supported by the new API either, and they don’t meet current legislation to install in Scotland. Feels like they are being left behind.
new integration set up and working but I dream of the day I can return to using Hassio to turn my hot water cylinder heating on and off like I could with badnest without needing to open a seperate app
Thank you for your response. Are you doing this with Google login or Nest login? Also, do you have 2FA enabled?