The CDP Logger is a tool for the Ciholas Ultra-Wideband (CUWB) Real-Time Location System (RTLS). It provides a method to record all data streams from the CUWB Manager. Recordings can then be played back using the CDP Player with the same timing as when the data was logged. This allows users to record and replay system data for testing and debugging the CUWB RTLS.
The CDP Logger allows a user to setup log rotation. By default, the CDP Logger logs all CUWB CDP data in a single file indefinitely. The log rotation feature allows users to split datasets into smaller files.
The logs that are captured by the CDP Logger can be played back using the CDP player. The player emits logged CDP packets over the selected network settings with the same timing at which the data was logged.
1. Only required for online installation.
2. Additional space may be required for CDP logging depending on the size of the CUWBNet and desired amount of history being kept in logs.
The CDP Logger may be installed on the same Host PC running the rest of the CUWB Software Package.
Follow the instructions below for CDP Logger installation. When prompted in the “CUWB Applications Selection”, ensure that CDP Logger is selected for installation.
Note: The CDP Player is bundled with the CDP Logger, both tools are installed as a part of the CDP Logger package.
The CDP Logger can be installed on Host PCs that do not have PPA access.
For instructions on how to obtain the DEB package, see Current Downloads Available for Software Packages. After downloading the package, transfer the DEB to a USB drive or other transfer method to the Host PC. After transferring the file, navigate to the file location, and type the command below into a terminal window to install the package:
sudo apt install ./cdp-logger_<version>_amd64.deb
Note: The CDP Player is bundled with the CDP Logger, both tools are installed as a part of the CDP Logger package.
Once the CDP Logger has been installed, launch the application by typing cdp-logger into a terminal window with any options below.
The command line options supported by the system are as follows:
| Option | Parameters | Arguments | Description |
|---|---|---|---|
| Debug | -d, --debug |
none | Activates debug mode. |
| File | -f, --file |
name_of_file | File where the CDP packets will be logged. If this option is not provided, it will default to cdp-log-\<date\>.00. |
| Help | -h, --help |
none | Prints the help message. |
| Interface Address | -i, --iface |
iface_addr | Log will be recorded on network interface with the specified IP address. |
| Max File Size | -m --max_size |
max_size | The max size, in megabytes, a log can be before splitting and logging to a new file. |
| Rotating Files | -r, --rotate |
number_of_files | The logger will rotate through the specified number of log files, moving to the next after each split. |
| Split Hours | --splithours |
number_of_hours | How often, in hours, to split and log to a new file. Value can be entered as decimal. |
| UDP Stream | -u |
udp_stream | Packets will be recorded from the specified UDP stream (ip:port). Default value is 239.255.76.67:7667. |
| Version | --version |
none | Print the version. |
| Zip | -z --zip |
none | Used in conjunction with other arguments that split logs. Whenever logging begins on a new file, the previous one is compressed. |
By default, the CDP Logger will log all incoming CDP data on the following network settings:
| Parameter | Value |
|---|---|
| IP | 239.255.76.67 |
| port | 7667 |
| interface | 0.0.0.0 |
To change network settings, use the UDP Stream command-line option (-u) to set the IP address and port; use the Interface Address command-line option (-i) to set the network interface. For example, the following command sets the CDP Logger to log data on IP = 239.255.76.66, port = 7665, and interface = 127.0.0.1 (localhost):
cdp-logger -u 239.255.76.66:7665 -i 127.0.0.1
Upon start up, the application prints the Interface Address, the UDP stream it is monitoring, and the designated log file path. To successfully capture a CDP log from a CUWBNet data stream, the Interface Address must align with the interface configured in the CUWB Manager. Similarly, the UDP stream settings must exactly match the IP:Port configuration specified within the Manager for that particular stream.
To conclude a logging session and ensure data is properly saved, stop the CDP Logger by pressing CTRL + C within the terminal.
By default, the CDP Logger saves data to a file named cdp-log-\<date\>.00. You can define a custom filename or specific directory file path using the -f option (e.g., ~/Documents/my-log.00). The Logger automatically appends a minimum two-digit numeric suffix to the filename; this ensures that even if the same filename if reused, the application will generate a unique file rather than overwriting previous data.
By default, log rotation is disabled, causing the CDP Logger to record all incoming data into a single file that grows indefinitely. To manage file sizes, you can configure rotation using the Rotating Files option (-r) to set the maximum number of files to maintain, and the Split Hours option (–splithours) to define the duration of each log segment. For example, the following command configures the Logger to rotate through a pool of 100 files, with each file capturing 15 minutes of data:
cdp-logger -r 100 --splithours 0.25
Log rotation can also be paired with the Max File Size option. The following command will set up the CDP logger such that the total size of the logs does not exceed 10GB, while each individual log is not greater than 1GB:
cdp-logger -r 10 -m 1024
Note: When log rotation is enabled, the system will begin overwriting the oldest log files once the limit specified by the Rotating Files option is reached. For instance, if you configure 100 log files at 15 minutes each, the oldest data will be replaced after 25 hours of continuous logging. Similarly, if the Logger is set to rotate through 10 files with a 1 GB size limit, the oldest file will be overwritten once the total logged data exceeds 10 GB.
Using the Linux command nohup, the cdp-logger process can be executed in the background. This approach facilitates the creation of a more complex logging system capable of capturing extensive data across the CUWBNet simultaneously. For example, consider a CUWBNet configured with the following Ethernet settings:
| Stream Name | UDP Stream | Interface Address |
|---|---|---|
| Config | 239.255.76.67:7671 | 169.254.100.100 |
| Anchor | 239.255.76.66:5858 | 169.254.100.100 |
| User | 239.255.76.66:9000 | 127.0.0.1 |
The following commands will capture logs of both their Anchor stream and User stream at the same time storing the data inside of anchor.log.00 and user.log.00 respectively:
nohup cdp-logger -u 239.255.76.66:5858 -i 169.254.100.100 -f anchor.log &
nohup cdp-logger -u 239.255.76.66:9000 -i 127.0.0.1 -f user.log &
Once logging has been completed, the command killall cdp-logger can be used to stop all the cdp-loggers at the same time.
Note: If performing an advanced logging task it is highly encouraged to use the -f flag to help with organizing the resulting logs.
Once a log file has been captured using the CDP Logger, the CDP Player can be used to replay the data. The player emits the recorded CDP packets over the selected network settings, strictly maintaining the original timing captured during the logging process. To launch the application, enter cdp-player into the command line followed by any of the configuration options listed below.
The command line options supported by the system are as follows:
| Option | Parameters | Arguments | Description |
|---|---|---|---|
| Debug | -d, --debug |
none | Activates debug mode. |
| End Time | --end |
end_time | The cdp-player will end playback at end_time seconds. |
| File | -f, --file |
name_of_file | Log file containing CDP data that will be played back. If this option is not provided, it will default to default.log |
| Help | -h, --help |
none | Prints the help message. |
| Interface Address | -i, --iface |
iface_addr | Log will be played on network interface with the specified IP address. |
| Loop | -l, --loop |
none | Replay continuously in a loop until the player is terminated. |
| Speed | -s, --speed |
speed_multiplier | Speed to play back the log (default is 1x). Can be a decimal number. |
| Start Time | --start |
start_time | The cdp-player will start playback at start_time seconds through the log. |
| UDP Stream | -u |
udp_stream | Packets will be played from the specified UDP stream (ip:port) Default value is - 239.255.76.67:7667 |
| Version | --version |
none | Print the version. |
By default, the CDP player replays all recorded CDP data using the following network settings:
| Parameter | Value |
|---|---|
| IP | 239.255.76.67 |
| port | 7667 |
| interface | 0.0.0.0 |
To modify the network settings, use the UDP Stream command-line option (-u) to define the IP address and port, and the Interface Address option (-i) to specify the network interface. For example, the following command configures the CDP Player to broadcast data to IP = 239.255.76.66, port = 7665, and interface = 127.0.0.1 (localhost):
cdp-player -u 239.255.76.66:7665 -i 127.0.0.1
Upon startup, the application prints the UDP stream target and the name of the log file being played. When replaying data for another program, ensure the player’s UDP stream aligns with the destination’s listening settings. You may also need the -i flag to specify the correct network interface for transmission. The CDP Player terminates automatically upon reaching the end of the log file. It can be manually stopped at any time by pressing CTRL+C in the terminal. Note that when using the loop option (-l), the player will repeat indefinitely, making CTRL+C the only method to end the process.
By default, the CDP Player searches for a file named default.log. To play a specific file, use the -f option followed by the filename or full directory path (e.g, ~/Documents/my-log.00).
You can isolate specific segments of a log using the --start and --end options, which accept values in seconds. For example, if a one-hour log contains relevant data only between the 20-minute and 35-minute marks, the following command will play only that 15-minute window:
cdp-player --start 1200 --end 2100
CDP Playback is fully compatible with the CUWB Viewer. To view the data:
| Version | Date | Change Description |
|---|---|---|
| v5.0.1 | 2025-11-14 | Updating Host PC Requirements |
| v5.0.0 | 2025-10-31 | Initial Preliminary Release |
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These Terms of Service were last modified on 2025-11-11.
[End of Agreement]
This appendix documents the legal attributions for third party software and components included in the CDP Logger and Player.
This program, “bzip2”, the associated library “libbzip2”, and all documentation, are copyright (C) 1996-2010 Julian R Seward. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Julian Seward, jseward@acm.org
bzip2/libbzip2 version 1.1.0 of 6 September 2010