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• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.1.3 Establishing a connection
  specifies the buffer sizes that the Client supports. The Server shall respond with an Acknowledge Message which completes the buffer negotiation. The negotiated buffer size shall be reported ... socket with or without a delay and sends a new ReverseHello Message . Hello Acknowledge Open Secure Channel Request Open Secure Channel Response Client establishes a SecureChannel and verifies that