Re: [lwip-users] [EXTERNAL] 2 Devices

[Xiaomin Lin]

Hi, 

I am doing similar thing. I think I will use one thread to collect data from 
multiple devices and feed them to corresponding netif->input.
Don't feed data directly to tcpip_input, if you do so, make sure you pass the 
right netif to it. Anyway make sure you have two individual netif.

For UDP, I believe you can bind with IP_ANY to listen on same port on all 
devices. In UDP recv callback, you can find the source IP in the parameters.

Are you working on something like a router? If so, what protocol you are 
working on and do you have any code resources to share, please?

xiaomin

-----Original Message-----
From: lwip-users [mailto:address@hidden On Behalf Of Fabian Cenedese
Sent: Tuesday, November 07, 2017 5:16 AM
To: address@hidden
Subject: [EXTERNAL] [lwip-users] 2 Devices

External Sender: Use caution with links/attachments.



Hello

I'm trying to implement 2 physical devices with LwIP.
This is what I have so far:

"One" LwIP (functions and global variables) One tcpip_thread Twice netif_add() 
and netif_set_up() Two threads to read the frames from the PHY and giving it to 
LwIP with tcpip_input

One PHY is working correctly but the second is not.
Somehow the frames from 1 end up in the handling from PHY 0 (recv or send).

Is my general way to go correct? Can this work with same IP addresses (of 
course not in the same network) or is the IP address/network mask needed to 
determine the outgoing interface?

With different IP addresses: Can I have one udp socket for each device bound to 
the same port?
If I can bind only one socket to one port, how can I handle frames incoming 
from two devices and send the replies with the correct (same) outgoing device?

Thanks

bye  Fabi


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