82d011c7a8
ab_server's RegisterSession sanity check rejects any non-zero sender context with encapsulation status 1 and a header-only reply, so every native session against the simulator failed with BadCommunicationError. libplctag sends zero (logix-register-session.hex); the codec test now matches that capture byte for byte instead of excluding the context, and a client test pins the zero on the wire.