[srslte-users] ZeroMQ Application in separated Machines for eNB - UE

Sat Jul 4 14:22:51 UTC 2020

Hi,

Though I have not tried it, it looks like the way to do it would be
change "localhost" to your machine address(s)

You can look at "http://api.zeromq.org/2-1:zmq-ipc" to see how the
listen/bind and connect endpoints are used and how they map to the
rx/tx_port values in the config file.

Then you can check the actual calls using "strace", its a handy tool to
have in your toolbox ...

strace -f -e trace=network ./srsenb ./enb.conf.zmq 2>&1 | tee enb.log

strace -f -e trace=network ./srsue ./ue.conf.zmq 2>&1 | tee ue.log

from here you can walk thru the system calls and return values etc.

Here is the enb setting up the listen socket on port 2000,

[pid  5756] socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 9
[pid  5756] setsockopt(9, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
[pid  5756] bind(9, {sa_family=AF_INET, sin_port=htons(2000),
sin_addr=inet_addr("127.0.0.1")}, 16) = 0
[pid  5756] listen(9, 100)              = 0
[pid  5756] getsockname(9, {sa_family=AF_INET, sin_port=htons(2000),
sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0
[pid  5756] getsockname(9, {sa_family=AF_INET, sin_port=htons(2000),
sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0
[pid  5758] socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 11
[pid  5758] connect(11, {sa_family=AF_INET, sin_port=htons(2001),
sin_addr=inet_addr("127.0.0.1")}, 16strace: Process 5759 attached

here is the ue, setting up the listen socket and then making a
connection ...

[pid  5771] socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_TCP) = 9
[pid  5771] setsockopt(9, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
[pid  5771] bind(9, {sa_family=AF_INET, sin_port=htons(2001),
sin_addr=inet_addr("127.0.0.1")}, 16) = 0
[pid  5771] listen(9, 100)              = 0
[pid  5771] getsockname(9, {sa_family=AF_INET, sin_port=htons(2001),
sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0
[pid  5771] getsockname(9, {sa_family=AF_INET, sin_port=htons(2001),
sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0
[pid  5775] accept4(9, {sa_family=AF_INET, sin_port=htons(42424),
sin_addr=inet_addr("127.0.0.1")}, [128->16], SOCK_CLOEXEC) = 11
[pid  5775] setsockopt(11, SOL_TCP, TCP_NODELAY, [1], 4) = 0
[pid  5775] getpeername(11, {sa_family=AF_INET, sin_port=htons(42424),
sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0
[pid  5775] getsockname(11, {sa_family=AF_INET, sin_port=htons(2001),
sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0
[pid  5775] getpeername(11, {sa_family=AF_INET, sin_port=htons(42424),
sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0

then you should see insane amounts of data flow ..

[pid  5758] sendto(17,
"\1\0\2\0\0\0\0\0\2\320\0\253\265\304=\344\365\17<\253\265\304=\344\365\17<\253\265\304=\344"...,
8192, 0, NULL, 0) = 8192
[pid  5758] recvfrom(16,
"\1\0\2\0\0\0\0\0\16\20\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
8192, 0, NULL, NULL) = 8192
[pid  5758] sendto(17,
"\211\221=\317#\231=|\211\221=\2745\243\274\247\3313=\2745\243\274\247\3313=\2745\243\274\247"...,
176139, 0, NULL, 0) = 176139
[pid  5758] recvfrom(16,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
913419, 0, NULL, NULL) = 720313
[pid  5758] recvfrom(16,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
193106, 0, NULL, NULL) = 193106
[pid  5758] recvfrom(17, "\1\0\0\1\377", 8192, 0, NULL, NULL) = 5
[pid  5758] sendto(16, "\1\0\0\1\377", 5, 0, NULL, 0) = 5

Joe

On 7/2/20 9:58 PM, Jairo Rodrigo Mejia Aponte wrote:
> Hi Community,
>
> I don't have any RF Equipment, therefore I want to use the ZeroMQ
> Application which fines really well in a single machine for eNB and
> the UE. However, I want to try to separate both things because I want
> to implement a more complicated machine for the UE Equipment but I
> don't have any information for this possibility.
>
> I think that I have to change the arguments of *tx_port *and *rx_port
> *of the device in the configuration but I don't know how to do it
> correctly. Maybe I am doing something wrong if someone could help me,
> I really appreciate. Both machines are connected via ethernet with a
> interface who has a /24 Mask.
>
> Thanks for your time,
>
> 	
> *Jairo Rodrigo Mejia Aponte*Electronic Engineer
> jmejiaap at everis.com
> <https://link.getmailspring.com/link/6D20651C-5C49-4916-915A-7BCF6E3C4047@getmailspring.com/0?redirect=mailto%3Ajmejiaap%40everis.com&recipient=c3JzbHRlLXVzZXJzQGxpc3RzLnNvZnR3YXJlcmFkaW9zeXN0ZW1zLmNvbQ%3D%3D>
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