Hi,
I do not understand the logic in your design. If you send data to one IP why
use 5 different ports ?
Either send some header that differentiate the 5 messages and in one receive
function filter them
to different recipient ?
As for your question:
First of all you listen on one single port, meaning you bind IP+port to one PCB.
Secondly when you send data you use udp_sendto (RAW API) or similar if you use
Netconn or Socket API
The udp_sendto function accepts IP and port:
err_t udp_sendto(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t
*dst_ip, u16_t dst_port)
As for reply UDP packets from remote you better add some data in the reply that
will give you
the correlation with the data sent.
Hope that helped.
BR,
Noam.
-----Original Message-----
From: Surya Chaitanya [mailto:address@hidden
Sent: Wednesday, December 07, 2016 10:53 AM
To: Mailing list for lwIP users
Cc: Noam Weissman; address@hidden; address@hidden
Subject: Re: [lwip-users] UDP bind error due to address and port reuse
Hi Noam,
Our situation is something like this:
We have a Xilinx FPGA board. From one source port on the board, we would like
to send 5 UDP request packets to 5 different destination port numbers on a PC.
And, we would also like to receive 5 response packets, one from each of the 5
ports on the PC to the single port on the FPGA board. Please let us know how to
achieve this using the lwIP stack. Thank You.
Regards,
Surya
On Sat, 3 Dec 2016 12:56:52 +0000, Noam Weissman wrote
Hi,
If I understand you correctly you are trying to bind IP:port several
times on the same machine
without closing the previous bind ?
This is not an option. You can bind UDP and TCP separately with two
different pcb's one for
TCP and one for UDP.
You cannot bind an IP:Port more then one time. This is the meaning of binding.
Its like a marriage between IP and a Port. Until you do not divorce
you cannot marry again [UTF-8?][😊]
BR,
Noam.
________________________________
From: lwip-users <address@hidden> on
behalf of Surya Chaitanya <address@hidden>
Sent: Saturday, December 3, 2016 10:44 AM
To: address@hidden
Subject: [lwip-users] UDP bind error due to address
and port reuse
Hi,
I've been trying to use lwip to transfer UDP packets. In my situation,
in the client
application, I would like to create 5 UDP PCBs having the same IP
address and port
number. Inspite of setting the SO_REUSE flag to 1, and
setting the SOF_REUSEADDR flag
to 1 for all the PCBs, the UDP bind error
still persists. Could somebody pls. help me
out? Thank You.
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