uhd

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Alternative stream destination

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It is possible to program the USRP to send RX packets to an alternative IP/UDP destination.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Set the subnet and gateway

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

To use an alternative streaming destination,

the device needs to be able to determine if the destination address

is within its subnet, and ARP appropriately.

Therefore, the user should ensure that subnet and gateway addresses

have been programmed into the device's EEPROM.

Run the following commands:

::

    cd <install-path>/share/uhd/utils

    ./usrp_burn_mb_eeprom --args=<optional device args> --key=subnet --val=255.255.255.0

    ./usrp_burn_mb_eeprom --args=<optional device args> --key=gateway --val=192.168.10.1

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Create a receive streamer

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Set the stream args "addr" and "port" values to the alternative destination.

Packets will be sent to this destination when the user issues a stream command.

::

    //create a receive streamer, host type does not matter

    uhd::stream_args_t stream_args("fc32");

    //resolvable address and port for a remote udp socket

    stream_args.args["addr"] = "192.168.10.42";

    stream_args.args["port"] = "12345";

    //create the streamer

    uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args);

    //issue stream command

    uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);

    stream_cmd.num_samps = total_num_samps;

    stream_cmd.stream_now = true;

    usrp->issue_stream_cmd(stream_cmd);

**Note:**

Calling recv() on this streamer object should yield a timeout.