I am trying to find the easiest way I can get isy to trigger a Homeseer event?

Community member @bpwwer has a Homeseer plugin that connects Homeseer to the ISY.  It allows control in either direction

Paul

Are you wanting to trigger the event from the ISY?  You can use the JSON interface to control devices.  You can perform a POST to run an event as well.  However take note that when you run an event "manually" the conditions are ignored and ONLY the ACTIONS are performed.  

To do this look at the docs here:

http://help.homeseer.com/help/ASCII-JSON/static/#.controlling_with_json

The pieces you want are:

• getevents
  • returns a list of all HomeSeer events.  You can run this in your browser and it's pretty ugly.  You can then copy/paste it into a JSON formatter online to make it pretty or into an editor of your choice that formats JSON nicely.  The key pieces you want are GROUP NAME and EVENT NAME
  • Example:

    • {"Group":"Outside Lights","Name":"Outside Lights - Off","id":9,"voice_command":"","voice_command_enabled":false}

• runevent
  • This is the call you send to HomeSeer to execute the event.  If you're event uses spaces and other characters doing a POST is easier
  • POST Example
    • URL:  <IP>/json
    • Body: {'action' : 'runevent', 'group' : 'Outside Lights', 'name' : 'Outside Lights - Off'}