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:* lwip-users-bounces+martypomeroy=novabio....@nongnu.org [mailto:lwip-users-bounces+martypomeroy=novabio....@nongnu.org] *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 m.ba...@gmail.com <mailto:m.ba...@gmail.com> _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
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