Would something like the following in the server handler do it for you?...

    def silentSource = ??? // Source that emits nothing but does never 
completes
    def handleDataFromClient: ByteString => Unit = ??? 

    ForeachSink[StreamTcp.IncomingConnection] { conn =>
      println("Client connected from: " + conn.remoteAddress)

      silentSource.via(conn.flow).to(Sink.foreach(handleDataFromClient)).run
    }

AFAIK there is no silent, non-completing Source implementation shipped with 
the akka streams library (1.0-M2).  We had a similar situation and had to 
create one using a very simple ActorPublisher. Alternatively, maybe first 
try it using a TickSource with a long initial delay.

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