Short answer: not possible.
A normal app can only access its own devices.
Using WebAPI it’s possible to access other devices. I don’t know if alarm is accessible. But WebAPI is not used.
Yeah, it’s no surprise.
It also isn’t even possible to set an alarm time by flows.
Thanks for looking into it!
Happy to learn today that your excellent community app is able to access HA via http://127.0.0.1:8123 from the Homey SHS Add-on 
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Nice, got me trying to connect it per Docker network, 172.130.x.x This works as well!
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Hi,
I have already some compound devices is use and which are working properly.
Now I wanted to a new one and I get this error
Any advice please 
EDIT:
Found the answer. The software of my Homey was to old. I have still used 12.5.?
After I have updated to 12.10.0 I can add a new device again
You’d know the “Custom device” is the (easier to use) successor of the Compound device.
The custom device doesn’t need the HACS Homey integration, including these yaml entries.
Yes, Peter is right.
Don’t use compound device and use custom device instead. Much easier and more flexible.
I would like to remove compound device someday.
Hi,
tried out the “Custom device”. Its working great but I would have some suggestions.
Each time I want to add a new entity I have to filter again for the device or a part of the device/sensor names wich can take some time….
Would it be possible to
-
Filter for a part of the device/sensor name for example tablet
-
You get all entities that match
-
You select on or more and add them
4a. on a next page you can modify them like changing the name…
4b. no next page and you can/have to modify the entity with the given functionality.
Please don’t remove the compound device because I have a lot of them. Specialty if have device where only a part of the sensor name changes you can just copy and past an existing yaml and only modify the sensor-name with search and replace.
It’s only so much to enter one you add a number of devices 
The details are dependent on the entity itself. So it won’t be possible to select several entities and then edit details. For example you have different options for a number_input entity (range) or energy entities.
And at the end it’s easier to handle the data in one page 
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Having a huge problem now. All my devices aren’t available anymore.
If I try to restart the app I get
In the settings I get
It looks like the settings are gone but I did not change anything.
I have created a diagnosis report
86cce45b-ad10-4921-b364-1bba05242a2d
Any help please 
First I’d install the app from homey.app store, without removing anything up front. It just gets installed again.
It seems there’s something else going but just in case: If your “long-lived access token” disappeared from app settings, you just copy-paste it back, from the safe place you stored it right after creation.
If you lost it, jusr create a new one per instructions
(Since [update x] the /security part shoud be added)
When it all works again, delete the old token from there.
Your log is empty - as if the app is not running 
After restarting Homey everything is back to normal 
