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[aprssig] Aprx v2 beta, now with Viscous Digipeater

Jason KG4WSV kg4wsv at gmail.com
Thu Oct 22 16:12:05 UTC 2009


On Thu, Oct 22, 2009 at 11:07 AM, Scott Miller <scott at opentrac.org> wrote:

> The T2 uses a list of 16-bit hashes for tracking dupes, with an 8-bit
> time-to-live for each, so that's 3 bytes per entry.  Currently the list is
> 15 entries long, so 45 bytes of storage total.
>
> To implement this on the T2 shouldn't require more than one extra bit of
> storage per entry.

I was thinking more of the buffer for the packets being held for
delayed digipeating.  Matti's web page refers to a "4-8 second" hold,
which sounds reasonable in operation, but that means a worst case of
up to eight 256 byte packets, or 2k RAM.  Even a minimum 4s hold is 1k
of buffer space.  This is all in addition to the dupe hash table.

-Jason
kg4wsv



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