I m not sure what you mean by add on devices but nortek one of the largest z wave device manufacturers makes the garage door controller that works with smartthings and is sold under multiple brand names including gocontrol and linear.
Linear z wave garage door opener installation smartthings.
If you haven t already try removing and bringing the door sensor closer to the opener.
You can also set up automations to open or close the garage door as you arrive and leave home.
If true in this case it sounds like the door sensor isn t communicating to the controller.
I happen to also have a linear garage door opener just by chance.
Then verify you get open close status by tilting the sensor in your hand.
From the home screen touch the plus icon and select device.
It also allows you to control the garage door like a regular switch on off to open close respectively.
The iris z wave garage door controller gd 00z 1 along with smartthings allows you to remotely open close and monitor your garage door.
To connect the gocontrol linear garage door opener gd00z 4 in the smartthings app.
The gocontrol linear z wave garage door opener remote controller is a no frills option for those with a z wave smart home but it s not a good choice if you just want to open and close your.
The gd00z 4 will act as a z wave repeater for other z wave devices on your smartthings network.
If i recall the iris door opener is a repackaged linear garage door opener.
You can also automate your garage door to open and close based on a schedule your mobile presence or other smartthings connected devices whatever suits your needs.
Also any wi fi garage door controller that has an ifttt connection might give you some integration.