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For SBE, code stubs are generated against the schema, using these to read/write a given message or field ensures it is well-formed. There are still ways to break the SBE messaging - e.g. receiving an enum value that is not supported in your stubs (i.e. schema compatibility issues). Any such error on reading/writing is a disconnection event.

In addition, SBE is a performance-oriented wire protocol. If checksums are included as for the FIX protocol, application-level checksum computation becomes a significant component of the overall cost.