It's a communty-supported app. I've been using it for a couple years and it works quite well. There are two options for installation, one that runs entirely on HE and one that splits the load between HE and some other device like an rPi. I use the former method. It is a bit chatty but works great and integrates nicely with HSM. The Envisalink board (not the HE integration) can also be used for remote monitoring (and there is a service available).
A couple of caveats: you can use all of the alarm system's sensors as HE devices but if the alarm system is in a mode set to ignore those sensors, it will. For instance, if your system is set to ARM STAY, your internal motion sensors will no longer report to HE so they can't be used to control interior lights. It makes sense, but just an FYI. You can also only use it with one partition. For most users that's not an issue. But if you have two partitions enabled on the panel it will only work with one. The Envisalink board is ethernet only, no wireless, so you'll need to run a cable.
Honestly the tricky part is not the envisalink app, it's installing the envisalnk board. But with a bit of patience and a careful read of the manual, not a big deal.
The big advantage is it leaves your panel intact and working just as it did before the install. I use a local alarm company for maintenance and monitoring. The first time they saw it I spent a few minutes explaining and when they saw the integration they said "wow this is cool. I wish we sold something like this." But if you're using one of the big boys they may be less inclined.
Installing the board (not the app) does require the installer code, though resetting it to the default is simple. But once again the first time the alarm company services it you'll need to let them know it's been reset and they'll likely change it again.
When you install the HE integration you have the option of installing it "bare bones" with just the device drivers or with HSM integration. If you choose the latter HSM becomes the user app.
There aren't any videos of which I'm aware but there's a lot of info here:
The mobile app that comes with Envisalink works but it is ugly. I don't use it.
Feel free to reach out if you need more info.
