BLE mesh SeqAuth

[Stayhungry]

In the Lower transport layer, segmentation will be carried out. The concept of a place is not very clear. Can you help me?

SeqAuth = IV Index + first segment SEQ = 56bit, SeqZero is the least significant 13bits of the SeqAuth.

When SEQ = 0x647262 is received, IV Index = 0x58437AF2, SeqZero = 0x1849

Why SeqAuth = 0x58437AF2645849, how is this calculated?

[Susheel Nuguru]

sorry for the late reply,

Isn't this the function that calculates the sequence number. 

static uint32_t seqauth_sequence_number_get(uint32_t seqnum, uint16_t seqzero)
{
    if ((seqnum & TRANSPORT_SAR_SEQZERO_MASK) < seqzero)
    {
        return ((seqnum - ((seqnum & TRANSPORT_SAR_SEQZERO_MASK) - seqzero) - (TRANSPORT_SAR_SEQZERO_MASK + 1)));
    }
    else
    {
        return ((seqnum - ((seqnum & TRANSPORT_SAR_SEQZERO_MASK) - seqzero)));
    }
}

I am not sure of the internals of segmentation