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<para>misc flags </para>
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<para>length of this buffer </para>
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<para>next pbuf in singly linked pbuf chain </para>
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<para>pointer to the actual data in the buffer </para>
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<para>the reference count always equals the number of pointers that refer to this pbuf. This can be pointers from an application, the stack itself, or pbuf->next pointers from a chain. </para>
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<detaileddescription>
<para>total length of this buffer and all next buffers in chain belonging to the same packet.</para>
<para>For non-queue packet chains this is the invariant: p->tot_len == p->len + (p->next? p->next->tot_len: 0) </para>
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<para>pbuf_type as u8_t instead of enum to save space </para>
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<para>Main packet buffer struct </para>
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