This function can let you know if a specific speaker client (host or host:instance) is currently busy speaking or playing WAV audio.
Parameter: host
Type: string
Description: Leaving this a null string will return the busy status for
the first instance HomeSeer finds, otherwise use the hostname of the computer
you are interested in determining the busy status of. If
more than one instance of the Speaker application is running on "host"
then you may need to specify the instance as well in the format host:instance.
Return value: busy
status
Type: boolean
Description: TRUE indicates that the speaker application instance is busy.