For anyone interested, I just finished up a driver that can flip the home mode on and off for Synology Surveillance Station. feel free to grab the code, I think its all good! but this is my first attempt at a driver!
I've been very disappointed with mobile device presence detection, not just with Hubitat, but any app that's supposed to do it, including DSCam, so I did the bluetooth beacon thing and that works AMAZING, so I needed to enable Synology to use that data also.
it seems there's an SSL issue... perhaps try try flipping the toggle to disable ssl checks? if you're using an IP, then SSL won't likely work properly as certificates don't generally include an IP.
for that you'd also want to use port 5000 (default non SSL port).
if you want to use SSL, you'll need to get a certificate on your Synology, use the DNS name in the driver config, and port 5001 (or whatever you have for your ssl port) and ensure the DNS name resolves to the IP you need it to, with access between Hubitat and your Synology. (I use PiHole on my network to handle this)