Using Bolt as realtime binary data transport

Hello!

Looking for a good way to transfer arbitrary data with Photon Bolt - both reliable and unreliable.

1) how well BoltConnection.StreamBytes suited for realtime use, comparing to Bolt state updates? just wondering if there any hidden buffering etc
2) when using StreamBytes, is there any way to know if bandwidth is saturated? (to decrease send rate)

We have client side prediction and serialization already implemented - using Bolt only for connection management and data transfer

Thanks!