I have Roku Streaming Sticks. The Roku remote uses RF to control these, there is no IR on the Roku Streaming stick. The Roku Streaming Stick also has WIFI and is connected to the internet (thats how it receives the stream from the various servers it’s streaming Apps talk to). The Harmony Hub (and the Harmony App on the smart phone) also have WIFI and internet connection and connect to the Roku Streaming Stick thru the Internet connection. This enables the Harmony Hub (and app) to communicate with and control the Roku. Everything else in my home theater setups is controlled by IR. By setting up the various devices on the Harmony Hub determines the control mechanism (IR, Internet), device control codes, etc. Then you combine the various devices you’ve set up in the Harmony Hub into a sequence of Activities to control multiple devices. It’s really a pretty complex system especially if you have a lot of denices, but once its set up properly, it works well. The Roku documentation is fairly good if you are a programmer type or work with automation, this will make sense.
