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Function of Tightbeam’s tb_transport_message_buffer_t wrapping field

Determine the purpose and operational semantics of the wrapping field in Tightbeam’s tb_transport_message_buffer_t, including its role during message construction and transmission.

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Background

The authors reconstruct parts of tb_transport_message_buffer_t (type, wrapping, offset, size) but cannot explain the wrapping field.

Clarifying this would help explain message ownership, fragmentation, or buffer reuse behaviors in Tightbeam.

References

The exact usage of the wrapping field remains unclear at this time.

— Modern iOS Security Features -- A Deep Dive into SPTM, TXM, and Exclaves (2510.09272 - Steffin et al., 10 Oct 2025) in Section Tightbeam — Tightbeam Transport Message Buffer Type