3.6.7. Streaming application utility

The streaming server can also be started through the command line.

root@rp-f0a235:~# streaming-server -h
Usage:
        streaming-server [-b] [-f PATH] [-p PORT] [-s PORT] [-v]
        streaming-server [--background] [--file=PATH] [--port=PORT] [--search_port=PORT] [--verbose]

        --background          -b        Run service in background.
        --file=PATH           -f FILE   Path to configuration file.
                                        By default uses the config file /root/.config/redpitaya/apps/streaming/streaming_config.json.
        --verbose             -v        Displays information.

To start the server, follow these steps:

1. Load the FPGA image for streaming.

   OS version 2.00OS version 1.04 or older

   redpitaya> overlay.sh stream_app
   

   Note

   SIGNALlab 250-12 uses stream_app_250 FPGA image.

2. Prepare a configuration file.

   Note

   In version 2.00, the configuration file has been moved to a new location: /root/.config/redpitaya/apps/streaming/streaming_config.json

3. Launch the console application.

   root@rp-f07167:/# streaming-server -c /root/.streaming_config
   streaming-server started
   Lost rate: 0 / 763 (0 %)
   Lost rate: 0 / 766 (0 %)
   Lost rate: 0 / 766 (0 %)
   Lost rate: 0 / 766 (0 %)
   

The configuration for streaming is automatically created and saved in the file: /root/.streaming_config during the editing of the parameters in the web application.

Note

Any changes to the web application will automatically modify the configuration file. If you want to save the configuration, then make a copy of the file.

Note

The server can be started in the background. To do this, use the -b parameter. In this mode, the application can be used as a service at system startup. Service information from the application is saved in the syslog file (by default, the Syslog is not installed on Red Pitaya).

Note

Streaming always creates three files:

• The first stores the streamed data

• The second stores the log of the streaming process.

• The third stores the log of lost packets during streaming.

Data streaming

Once the streaming server is running, you can start streaming data from ADC and to DACs of the Red Pitaya board. For more information, please refer to the Data stream control application documentation.

Source Code

Data stream control application source code..

For streaming, two versions of clients are available - console and desktop for Linux and Windows operating systems. You can download them from the WEB streaming application on Red Pitaya itself. You can also build a version from source files under Mac OS using QT Creator.