I will be controlling a cable set top box with IR. What is the best IR emitter to use? The rest of my home theatre uses GlobalCache IP2IR units and HomeSeer 3. With NextPVR support those?
I don't personally use IR blasters these days, so can't give you any solid recommendations.
NextPVR's blaster support is supplied via the ability run executables with configurable parameters, so you should be able to use any blaster hardware that has an executable available.
