I'm a bit sad to see what looks like the end of the Esquilo Air. I have three of them. Two have been in constant operation for some time monitoring things in my house. The third has moved around in different functions. It ran a neopixel Christmas tree ornament that I could control from my phone for a few weeks. Not a demanding application, but one that was very easy to implement.
I really liked the fact that the interface through the web looked the same if the board was sitting next to me or was accessed remotely over the web. However, the Nest server was unreliable. It would go offline sometimes for days until the manager of the site was notified. That should not have been necessary.
The community was always small, at least in terms of the amount of interaction on the site. I was always hoping to see things catch fire, but they never did.
The store was also unreliable. Not always working right. A quick way to fail is to not be there for willing customers. There was an announcement on December 17 about the store being shut down because of slow activity. The announcement didn't say if manufacturing and distribution would continue. Mouser 737 for sale as of this writing. The boards are available, but perhaps the support will not be. More information from Patrick and Scott would be nice.