Bluetooth Serial example un Puck

I believe some level of retransmit/error correction is done by the Bluetooth stack - it seems pretty reliable for code uploads anyway
Not yet, so you'd have to implement your own. Espruino itself can implement software XON/XOFF flow control on Serial, but so far that hasn't been extended for use with Bluetooth.

These things are a bit contradictory, aren't they? I was actually meaning flow control over the BLE uart connection. I'm pretty sure that if I'm sending data to fast It will choke at some point..