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Tightbeam transport message buffer ‘wrapping’ field semantics

Determine the semantics and role of the ‘wrapping’ field in tb_transport_message_buffer_t within Tightbeam, including its impact on message buffer construction, multipart messaging, and delivery behavior.

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Background

The reverse engineering reconstructs several fields of tb_transport_message_buffer_t (type, wrapping, offset, size), but the ‘wrapping’ field’s purpose remains unknown.

Clarifying this field’s behavior is important for a complete understanding of Tightbeam’s transport abstraction and message handling.

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”