Referring to this device -
https://www.amazon.com.au/Broadlink-Routines-Automation-SR3-4KEY-Kit/dp/B08YJ1M3QX
After having a reasonable crack at trying to get these to work with HA, I have been more or less unsuccessful 
A workaround that I am not really happy with is:
- Write a script in HA
- Have Alexa discover the script
- Have Alexa use the Broadlink Button to trigger the HA script
It works, but it is slow, relies on the cloud, relies on Amazon, and is quite unreliable
It would be wonderful if there was the possibility of having this work locally
I believe the support for S3 hub at least, has been partially implemented in HA?
Referring to these discussions:
community.home-assistant .io/t/support-broadlink-s3-hub-0xa59c-and-tc3-switch/381193/3
community.home-assistant .io/t/broadlink-s3-hub-and-tc3-switch/316598
community.home-assistant .io/t/broadlink-s3-hub-support/319832
(new users are unable to create more than 2 links in a post)
To be honest I’ll probably just end up getting Zigbee buttons, but hey.