after upgrading to iOS12 couldn't receive "NSStreamEventOpenCompleted" event

Originator:atid1.develop
Number:rdar://44933333 Date Originated:October 2 2018
Status:open Resolved:
Product: Product Version:
Classification: Reproducible:open
 
I develop a Demo app to connect with BT(SPP) device
after upgrading to iOS12 couldn't receive "NSStreamEventOpenCompleted" event quiet often. so when I try to write data to stream  "hasBytesAvailable" return false
I used same app with iOS11 it works fine but iOS12 after open the stream it doesn't send "NSStreamEventOpenCompleted"

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