[srslte-users] Using UDP sockets for ZeroMQ based RF driver

[Vikas Jain]

Hi,

We are trying to bring up the LTE call between UE and ENB using  ZeroMQ UDP
sockets (instead of the ZeroMQ REQ/REPLY sockets which are TCP based).

ZeroMQ suggests to use RADIO and DISH type sockets to achieve UDP
communication as per http://api.zeromq.org/master:zmq-udp

We made the following change to the lib/src/phy/rf/rf_zmq_imp.c file:

int rf_zmq_open_multi(char* args, void** h, uint32_t nof_channels)
{
     ....
     //rx_opts.socket_type   = ZMQ_REQ;
     //tx_opts.socket_type   = ZMQ_REP;
     rx_opts.socket_type   = ZMQ_RADIO;
     tx_opts.socket_type   = ZMQ_DISH;
     ....
}

After making the above change, we see that the sockets get instantiated,
but the zmq_recv and zmq_send operation are failing with zmq_errno = 95
(ENOTSUP Not supported).
We had the following questions:
(1) Does srsLTE support operation with ZeroMQ UDP sockets e.g. using
RADIO/DISH socket types as suggested by ZeroMQ?
(2) If the ZeroMQ based UDP operation is supported, please guide us on if
there are any steps that we are missing or need to do differently for UDP
operation.
(3) if ZeroMQ based UDP is not supported, are there any other alternate
ways in which we can achieve UDP based fake RF driver for UE and eNB
connectivity?

Any help on this topic will be greatly appreciated.
Thanks.
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