When the flow control is activated, OT notifies the client with a
T_GODATA event, but it also 'sometimes' returns a kOTLookErr
error from OTSnd (maybe OTRcv too?) along with the notification.
this results in failures in recvfrom or sendto. Adding a test case
for kOTLookErr and calling OTLook(fEndpoint); in these functions
while ignoring OTLook's result seems to fix it, as the notification is
always called to unlock flow-control.
and btw, thanks again for your incredible GUSI ((: