Re: [lwip-users] lwip + profinet ... possible?

[Claudius Zingerli]

Hi,

On 2014-02-14 18:44, Pomeroy, Marty wrote:
> Bandu
>  From http://us.profinet.com/technology/profinet/: "Real Time (PROFINET
> RT): Here the TCP/IP layers are bypassed in order to give deterministic
> performance...".

IMHO, there is no point in that. The same stuff is claimed by Ethercat, 
but as I understand it, any protocol - including TCP - would be 
deterministic, given there is a full duplex path, no packet loss and no 
congestion...


> Given that Profinet's whole reason for being is to support real time
> communications in industrial automation (while being "compatible" with
> standard ethernet), it seems very unlikely that lwip can help you.
> Marty

Probably only on the first two layers and only if there is no other 
communication going on, or do they use QoS? I was working on an 
implementation of Ethercat and just extracted the packets in the NIC 
driver at the Ethertype checking, so it's really beyond lwip's control. 
There is an Ethernet-over-Ethercat(over-Ethernet). These packets are 
forwarded to lwIP again.

Hope that helps

Claudius


> ------------------------------------------------------------------------
> *From:* address@hidden
> [mailto:address@hidden *On
> Behalf Of *Bandu
> *Sent:* Thursday, February 13, 2014 6:31 PM
> *To:* Mailing list for lwIP users
> *Subject:* [lwip-users] lwip + profinet ... possible?
>
> Hi,
>
> Is there anyone successfully implement profinet with lwip? (couldn't
> find any opensource on google related to profinet stack except expensive
> 3rd party stacks)
> is that possible to implement profinet using lwip stack?
>
> thanks
>
> --
> Bandu
> address@hidden <mailto:address@hidden>
>
>
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