Unknown data warning in log file perhaps due to ATV

When we are watching something on our Apple TV 2 (unsupported in Home Assitant I think, our log file is filled with lots of errors like the one in below:

Log Details (WARNING)
Wed Mar 28 2018 20:50:34 GMT+0200 (CEST)

Unknown data: b'ceNQ\x00\x00\x00\x04\x00\x00\x00\x00cann\x00\x00\x00\t'

The errors are shown in the Info screen using the Developer tools, but not written to the home-assistant.log file.

I had attempted to set up an Apple TV Remote for the unsupported 2nd generation ATV which worked partially, a long time ago, but have normally commented everything of that setup out in the YAML files.

Does anyone now how to get rid of these messages?