There's a problem with the ANT SDK that means that it's not really suitable for any Android App that needs realtime access to incoming ANT messages.
The problem is that AntChannel objects buffer incoming ANT messages and then periodically (once every 2 seconds) pass on the ANT messages to channel users (via the function onReceiveMessage)
This means that any time based application only knows when ANT messages were sent/received at a 2 second resolution.