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The reason the extra auxiliary PDU type field is needed is that the
four-bit auxiliary PDU type is ambiguous and context-dependent for
auxiliary PDUs. See Volume 6, Part B, Section 2.3, Table 2.3. The four
least significant bits of the advertising PDU header will be 0b0111 for
AUX_ADV_IND, AUX_CHAIN_IND, AUX_SYNC_IND, and AUX_SCAN_RSP, so you need
extra information to distinguish those. The ADV_EXT_IND PDU can be
distinguished from those despite also being 0b0111 because it's not on a
secondary advertising channel (ie. not an auxiliary advertisement).
Sultan
On Fri, Jul 10, 2020 at 6:30 PM Guy Harris <ghar...@sonic.net> wrote:
> For an advertising physical channel PDU, it appears that the PDU type is
> in the least-significant 4 bits of the PDU header.
>
> Is that not present in an auxiliary advertising packet?
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