UDP Network?

GNU Radio
1

Hey everyone,

I’m currently trying to send the same generated signal from two usrp’s
to a third usrp/host. On the transmitting side, I can clearly see both
signals going out, but on the receiving side, I am getting a runtime
error.

On the UDP connection on the transmitting side, I have both destination
addresses being the third usrp/host, and on the receiving end side, I
incorporated two UDP source blocks (since one block can only take in one
input) and have both of their addresses being the the same destination
address as the transmitting side (seeing that when dealing with UDP,
both sides have to have the same address in order to know where they
will send and pick up the signal). Would my problem be that on my
receiving side, I have both UDP sources with the same address (as I
would not know which UDP source is receiving which signal)?

Thanks in advance,
Marcus

2

Do you have different ports for your different UDP streams?

Greetings,
Marcus

3

Hm, strange.
Can you do
"ncat --listen --udp "
for both, 1234 and 1240? (If it works, kill it with ctrl-c). If it
doesn’t allow you to bind to that address, run “ip addr” to make sure
you have actually assigned that address to your network interface.

The error indicates that the host you’re running on doesn’t actually
have the IP address you set in the UDP sources; are you doing NAT
somewhere in between?

Greetings,
Marcus

4

Hey Marcus,

Yes, I checked that and on the first UDP stream, I am using port 1234
while on the second UDP stream I am using port 1240 and I am still
getting: Runtime Error:bind: Cannot Assign requested address

From: discuss-gnuradio-bounces+marcus.ward=removed_email_address@domain.invalid
[mailto:discuss-gnuradio-bounces+marcus.ward=removed_email_address@domain.invalid] On
Behalf Of Marcus M.
Sent: Wednesday, July 23, 2014 2:08 PM
To: [email protected]
Subject: Re: [Discuss-gnuradio] UDP Network?

Do you have different ports for your different UDP streams?

Greetings,
Marcus
On 23.07.2014 19:42, Ward, Marcus D. wrote:

Hey everyone,

I’m currently trying to send the same generated signal from two usrp’s
to a third usrp/host. On the transmitting side, I can clearly see both
signals going out, but on the receiving side, I am getting a runtime
error.

On the UDP connection on the transmitting side, I have both destination
addresses being the third usrp/host, and on the receiving end side, I
incorporated two UDP source blocks (since one block can only take in one
input) and have both of their addresses being the the same destination
address as the transmitting side (seeing that when dealing with UDP,
both sides have to have the same address in order to know where they
will send and pick up the signal). Would my problem be that on my
receiving side, I have both UDP sources with the same address (as I
would not know which UDP source is receiving which signal)?

Thanks in advance,

Marcus

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