is a user application executed from the command line and configured through a YAML configuration file.
depends on fastrtps
and fastcdr
libraries. In order to correctly execute the Router, make sure that fastrtps
and fastcdr
are properly sourced.
source <path-to-fastdds-installation>/install/setup.bash
Note
If Fast DDS has been installed in the system, these libraries would be sourced by default.
The application supports several input arguments:
Command | Option | Long option | Value | Default Value |
---|---|---|---|---|
user_manual_user_interface_help_argument |
-h |
--help |
||
user_manual_user_interface_version_argument |
-v |
--version |
||
user_manual_user_interface_configuration_file_argument |
-c |
--config-path |
Readable File Path | ./DDS_ROUTER_CONFIGURATION.yaml |
user_manual_user_interface_reload_time_argument |
-r |
--reload-time |
Unsigned Integer | 0 |
user_manual_user_interface_debug_argument |
-d |
--debug |
||
user_manual_user_interface_log_verbosity_argument |
--log-verbosity |
info warning error |
warning |
|
user_manual_user_interface_log_filter_argument |
--log-filter |
String | "DDSROUTER" |
It shows the usage information of the application.
Usage: Fast DDS Router
Connect different DDS networks via DDS through LAN or WAN.
It will build a communication bridge between the different Participants included in the provided configuration file.
To stop the execution gracefully use SIGINT (C^) or SIGTERM (kill) signals.
General options:
Application help and information.
-h --help Print this help message.
-v --version Print version, branch and commit hash.
Application parameters
-c --config-path Path to the Configuration File (yaml format) [Default: ./DDS_ROUTER_CONFIGURATION.yaml].
-r --reload-time Time period in seconds to reload configuration file. This is needed when FileWatcher functionality is not available (e.g. config file is a symbolic link). Value 0 does not reload file. [Default: 0].
-t --timeout Set a maximum time in seconds for the Router to run. Value 0 does not set maximum. [Default: 0].
Debug options
-d --debug Set log verbosity to Info (Using this option with --log-filter and/or --log-verbosity will head to undefined behaviour).
--log-filter Set a Regex Filter to filter by category the info and warning log entries. [Default = "DDSROUTER"].
--log-verbosity Set a Log Verbosity Level higher or equal the one given. (Values accepted: "info","warning","error" no Case Sensitive) [Default = "warning"].
It shows the current version of the DDS Router and the hash of the last commit of the compiled code.
Please refer to user_manual_user_interface_configuration_file
for more information on how to build this configuration file.
Set the user_manual_user_interface_reload_timer
in seconds.
This argument allow to set a maximum time while the application will be running. Setting this argument will set the number of seconds the application will run until it is killed. While the application is waiting for timeout, it is still possible to kill it via signal. Default value 0
means that the application will run forever (until kill via signal).
This argument enables the logs so the execution can be followed by internal debugging information. This argument sets user_manual_user_interface_log_verbosity_argument
to info
and user_manual_user_interface_log_filter_argument
to DDSROUTER
. For more information about debugging options, refer to user_manual_user_interface_log
.
Note
If this argument is used with any of the other arguments of debugging, the behavior depends on the order of parser of the arguments.
Set the verbosity level so only log messages with equal or higher importance level are shown.
Set a regex string as filter. Only log messages with a category that matches this regex will be printed (ERROR
messages will be always shown unless user_manual_user_interface_log_verbosity_argument
is set to ERROR
).
A requires one and only one YAML configuration file as the operation of this application is configured via this YAML configuration file. Please refer to user_manual_configuration
for more information on how to build this configuration file.
This YAML configuration file must be passed as argument to the when executed. If no configuration file is provided as argument, the will attempt to load a file named DDS_ROUTER_CONFIGURATION.yaml
that must be in the same directory where the application is executed. If no configuration file is passed as argument, and the default configuration file does not exist in the current directory, the application will fail.
The topics that the is routing could be changed at runtime. Including topics in configuration's allowlist
will create new Writers <DataWriter>
and Readers <DataReader>
for each Participant in the Router. Removing a topic from allowlist
will disable this topic, and so it will stop routing data in such topic. Be aware that disabling a topic does not eliminate the entities of that topic. So, if a topic has been active before, the Writers and Readers will still be present in the and will still receive data.
There exist two methods to reload the list of allowed topics, an active and a passive one. Both methods work over the same configuration file with which the has been initialized.
A File Watcher is a process that runs in the background and tracks changes in the configuration file. Every time the file is changed, the OS sends a notification, and the File Watcher listens such notification and interacts with the in order to reload the topics. This event occurs every time the configuration file is saved.
FileWatcher is used in every execution by default. However, this method does not work properly in specific scenarios where the file being watched is not a real file but a link (e.g. Kubernetes executions).
A timer can be set in order to periodically reload the configuration file. The configuration file will be automatically reloaded according to the specified time period.
Log module of uses the logging module. This log has 3 severity levels: INFO
, WARNING
and ERROR
. Every log has also a category associated. This is how a log looks like:
Date Category Severity Log message Function
2022-11-16 14:58:13.375 [MODULE_SUBMODULE Error] It has happen ... because of ... -> Function main
Every log entry has several parts:
- Date: format:
year-month-day hour::minute::second::millisecond
with millisecond accuracy. This is the time when the log was added to the log queue, not when it is printed. - Category: Reference to the module where the log was raised. It is used to filter logs.
- Severity: Could be
Info
,Warning
orError
. - Log message: The actual log message.
- Function: Name of the function or method that has produced this log entry.
Note
For INFO
logs to be compiled, the must have been compiled with CMake option CMAKE_BUILD_TYPE=Debug
, or compiled with CMake option LOG_INFO=ON
.
If Fast DDS has been compiled in debug mode, it will print the logs of the DDS Router and Fast DDS mixed. In order to skip Fast DDS logs, compile fastrtps
library with CMake option -DLOG_NO_INFO=ON
or CMAKE_BUILD_TYPE
different to Debug
, or use the argument ``
In order to stop a application, use one of the following OS signals:
Send an interruption SIGINT | ^C
signal (signal value 2) to the process. Press Ctrl + C
in the terminal where the process is running.
Send an interruption SIGTERM
signal (signal value 15) to the process by executing the command kill <pid>
in a different terminal, where <pid>
is the id of the process running the . Use the ps
or top
programs to check the processes' ids.
Setting a maximum amount of seconds that the application will work using argument --timeout
will close the application once the time has expired.