In the code it looks like Control.On will do same as Control.ArmAway... and Off same as Disarm.
Thanks this works for me too:
http://<IP>/api/HomeAutomation.HomeGenie.Automation/90/Control.Disarm
From the code it looks like we need these fields, in this order to parse correctly:
<domain>/<address>/<pid>/<command>
<domain>=HomeAutomation.HomeGenie.Automation (how do you find this?)
<address>=?
(how does it parse correctly without this? adding it with a "1" fails)
<pid>=90
<command>=Control.Disarm
Thanks again!!!