We are also interested on this topic. We just tried to connect RS2 with iOS bluetooth without success. So I assume, the devices are still not trusted?
There is a number of cities that are restricted to iOS mobile devices due to IT security policies (let’s not discuss wether this is a good idea, we just have to face this fact). As far as I have found ArcGIS collector does not support TCP-data stream, therefore this workaround does not help in this case.