Thought I’d add my experience on TrainerRoad and Zwift without the need for two ANT+ dongles. I think someone mentioned it on here before but here it is again for people who are interested.
I logged on to Zwift, paired my Kickr, and then unpaired it in the bottom right hand corner of the pairing screen. The Power Meter icon in the top left of the pairing screen stayed lit, and was reading the power from the Kickr. I then started TR using bluetooth on my iPhone and started an interval workout. The iPhone controls the power on the Kickr as normal, and Zwift receives an identical power output but does not try to take control of the Kickr (because it now sees it as a power meter and not a trainer).
So the effect is what the guys above have achieved, but the Kickr is relaying the power itself rather than needing TR and 2 dongles on the computer.
For info my computer is an Asus Zenbook (so it’s on the lowest graphics setting) and I have a single ANT+ dongle linked to Zwift.
I haven’t seen what happens if you try to use the Zwift link app on the phone at the same time (I guess TR would pause/stop), but for me this is better than buying a second dongle.
Hope this survives into the final code!
More generally, great work Zwift team. This Zwift + Trainerroad combination without 2 dongles would keep me interested until there is an equivalent option to do FTP-based workouts in Zwift natively.