Lighting switch state communication

["intergate news groups" <djraher@xxxxxxxxxxxxx>]

I am planning out my new home HA system, and one of the requirements is to
have a light switch status, or more precisely, change in status,
communicated back to the ELK system I will be using. It dawned on me that my
plans to use X10, INSTEON, or Z-wave may not RELIABLY provide this
capability. I had been thinking that if I changed the light in question via
IR, that the communication of status would work, but not so if the switch
itself was used.  Has anyone any real life experience with communicating
switch status using any of these protocols?

Dennis