Between cancelling the initial "available" subscription and attaching
the network-loss listener, no listener was attached to the broadcast
event stream for a brief window. Events landing in that gap (notably
a late SSID update, which real hardware without STA concurrency often
fires very close after "available") were silently lost since broadcast
streams don't buffer for late subscribers. Now uses one continuous
subscription for the whole connection lifetime instead.
Constantin Leue
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