Eclipse Zenoh

The Eclipse Zenoh: Zero Overhead Pub/sub, Store/Query and Compute.

Zenoh (pronounce /zeno/) unifies data in motion, data at rest and computations. It carefully blends traditional pub/sub with geo-distributed storages, queries and computations, while retaining a level of time and space efficiency that is well beyond any of the mainstream stacks.

Check the website zenoh.io and the roadmap for more detailed information.

DDS plugin and standalone `zenoh-bridge-dds`

👉 Install latest release: see below

👉 Docker image: see below

👉 Build "main" branch: see below

Background

The Data Distribution Service (DDS) is a standard for data-centric publish subscribe. Whilst DDS has been around for quite some time and has a long history of deployments in various industries, it has recently gained quite a bit of attentions thanks to its adoption by the Robotic Operating System (ROS 2) -- where it is used for communication between ROS 2 nodes.

⚠️ On usage with ROS 2 ⚠️

This plugin is based on the DDS standard, and thus can work with ROS 2 to some extent.

However we strongly advise ROS 2 users to rather try the new zenoh-plugin-ros2dds which is dedicated to the support of ROS 2 with DDS. Thanks to a better integration with ROS 2 concepts, this new plugin comes with those benefits:

Better integration of the ROS graph (all ROS topics/services/actions can be seen across bridges)
Better support of ROS toolings (ros2 CLI, rviz2...)
Configuration of a ROS namespace on the bridge (instead of on each ROS Node)
Services and Action as Zenoh Queryables with more efficiency and scalability that RPC over DDS
Even more compact discovery information between the bridges (not forwarding all ros_discovery_info messages as such)

This Zenoh plugin for DDS will eventually be deprecated for ROS 2 usage.

Plugin or bridge ?

This software is built in 2 ways to choose from:

zenoh-plugin-dds: a Zenoh plugin - a dynamic library that can be loaded by a Zenoh router
zenoh-bridge-dds: a standalone executable

The features and configurations described in this document applies to both. Meaning the "plugin" and "bridge" words are interchangeables in the rest of this document.

How to install it

To install the latest release of either the DDS plugin for the Zenoh router, either the zenoh-bridge-dds standalone executable, you can do as follows:

Manual installation (all platforms)

All release packages can be downloaded from:

https://download.eclipse.org/zenoh/zenoh-plugin-dds/latest/

Each subdirectory has the name of the Rust target. See the platforms each target corresponds to on https://doc.rust-lang.org/stable/rustc/platform-support.html

Choose your platform and download:

the zenoh-plugin-dds-<version>-<platform>.zip file for the plugin.
Then unzip it in the same directory than zenohd or to any directory where it can find the plugin library (e.g. /usr/lib)
the zenoh-bridge-dds-<version>-<platform>.zip file for the standalone executable.
Then unzip it where you want, and run the extracted zenoh-bridge-dds binary.

Linux Debian

Add Eclipse Zenoh private repository to the sources list:

echo "deb [trusted=yes] https://download.eclipse.org/zenoh/debian-repo/ /" | sudo tee -a /etc/apt/sources.list > /dev/null
sudo apt update

Then either:

install the plugin with: sudo apt install zenoh-plugin-dds.
install the standalone executable with: sudo apt install zenoh-bridge-dds.

How to build it

⚠️ WARNING ⚠️ : Zenoh and its ecosystem are under active development. When you build from git, make sure you also build from git any other Zenoh repository you plan to use (e.g. binding, plugin, backend, etc.). It may happen that some changes in git are not compatible with the most recent packaged Zenoh release (e.g. deb, docker, pip). We put particular effort in maintaining compatibility between the various git repositories in the Zenoh project.

⚠️ WARNING ⚠️ : As Rust doesn't have a stable ABI, the plugins should be built with the exact same Rust version than zenohd, and using for zenoh dependency the same version (or commit number) than 'zenohd'. Otherwise, incompatibilities in memory mapping of shared types between zenohd and the library can lead to a "SIGSEV" crash.

In order to build the zenoh bridge for DDS you need first to install the following dependencies:

Rust. If you already have the Rust toolchain installed, make sure it is up-to-date with:
```
$ rustup update
```
On Linux, make sure the llvm and clang development packages are installed:
- on Debians do: sudo apt install llvm-dev libclang-dev
- on CentOS or RHEL do: sudo yum install llvm-devel clang-devel
- on Alpine do: apk install llvm11-dev clang-dev
CMake (to build CycloneDDS which is a native dependency)

Once these dependencies are in place, you may clone the repository on your machine:

$ git clone https://github.com/eclipse-zenoh/zenoh-plugin-dds.git
$ cd zenoh-plugin-dds
$ cargo build --release

The standalone executable binary zenoh-bridge-dds and a plugin shared library (*.so on Linux, *.dylib on Mac OS, *.dll on Windows) to be dynamically loaded by the zenoh router zenohd will be generated in the target/release subdirectory.

Enabling Cyclone DDS Shared Memory Support

Cyclone DDS Shared memory support is provided by the Iceoryx PSMX plugin based on the Iceoryx library. Iceoryx introduces additional system requirements which are documented here.

Note: To ensure successful communication the entire system should be built to use the same version of the Iceoryx Library. The Zenoh DDS Plugin currently uses Iceoryx v2.0.5.

To build the zenoh bridge for DDS with support for shared memory the dds_shm optional feature must be enabled during the build process as follows:

plugin library:

$ cargo build --release -p zenoh-plugin-dds --features dds_shm

standalone executable binary:

$ cargo build --release -p zenoh-bridge-dds --features dds_shm

Note: Iceoryx does not need to be installed to build the bridge when the dds_shm feature is enabled. Iceoryx will be automatically downloaded, compiled, and statically linked into the zenoh bridge as part of the cargo build process.

When the zenoh bridge is configured to use DDS shared memory (see Configuration) the Iceoryx RouDi daemon (iox-roudi) must be running in order for the bridge to start successfully. If not started the bridge will wait for a period of time for the daemon to become available before timing out and terminating.

When building the zenoh bridge with the dds_shm feature enabled the iox-roudi daemon is also built for convenience. The daemon can be found under target/debug|release/build/cyclors-<hash>/out/iceoryx-build/bin/iox-roudi.

See here for more details of shared memory support in Cyclone DDS.

Shared Memory Limitations

The following limitations apply to Cyclone DDS shared memory support in the plugin:

Shared memory is not supported on Windows systems.
When DDS shared memory is enabled the Iceoryx PSMX plugin will be instantiated with the default configuration. If additional configuration is required the Iceoryx plugin should be configured via the CYCLONEDDS_URI instead.
In forward discovery mode DDS samples will not be forwarded via Zenoh unless the DDS data type is memcpy safe. A data type is memcpy safe if it does not contain indirections.

ROS 2 package

⚠️ Please consider using zenoh-bridge-ros2dds which is dedicated to ROS 2.

If you're a ROS 2 user, you can also build zenoh-bridge-dds as a ROS package running:

rosdep install --from-paths . --ignore-src -r -y
colcon build --packages-select zenoh_bridge_dds --cmake-args -DCMAKE_BUILD_TYPE=Release

The rosdep command will automatically install Rust and clang as build dependencies.

If you want to cross-compile the package on x86 device for any target, you can use the following command:

rosdep install --from-paths . --ignore-src -r -y
colcon build --packages-select zenoh_bridge_dds --cmake-args -DCMAKE_BUILD_TYPE=Release  --cmake-args -DCROSS_ARCH=<target>

where <target> is the target architecture (e.g. aarch64-unknown-linux-gnu). The architecture list can be found here.

The cross-compilation uses zig as a linker. You can install it with instructions in here. Also, the zigbuild package is required to be installed on the target device. You can install it with instructions in here.

Docker image

The zenoh-bridge-dds standalone executable is also available as a Docker images for both amd64 and arm64. To get it, do:

docker pull eclipse/zenoh-bridge-dds:latest for the latest release
docker pull eclipse/zenoh-bridge-dds:main for the main branch version (nightly build)

⚠️ However, notice that it's usage is limited to Docker on Linux and using the --net host option.
The cause being that DDS uses UDP multicast and Docker doesn't support UDP multicast between a container and its host (see cases moby/moby#23659, moby/libnetwork#2397 or moby/libnetwork#552). The only known way to make it work is to use the --net host option that is only supported on Linux hosts.

Usage: docker run --init --net host eclipse/zenoh-bridge-dds
It supports the same command line arguments than the zenoh-bridge-dds (see below or check with -h argument).

Usage

The use cases of this Zenoh plugin for DDS are various:

integration of a DDS System with a Zenoh System
communication between DDS System and embedded devices thanks to zenoh-pico
bridging between different DDS Systems, across various transports, via a Zenoh infrastructure (i.e. some routers or directly in peer-to-peer between the bridges)
scaling a DDS system up to the Cloud with Zenoh routers
integration with any technology supported by other Zenoh Plugins (MQTT, ROS 2 ...) or Storages technology (InfluxDB, RocksDB)

Configuration

zenoh-bridge-dds can be configured via a JSON5 file passed via the -cargument. You can see a commented example of such configuration file: DEFAULT_CONFIG.json5.

The "dds" part of this same configuration file can also be used in the configuration file for the zenoh router (within its "plugins" part). The router will automatically try to load the plugin library (zenoh-plugin_dds) at startup and apply its configuration.

zenoh-bridge-dds also accepts the following arguments. If set, each argument will override the similar setting from the configuration file:

zenoh-related arguments:
- -c, --config <FILE> : a config file
- -m, --mode <MODE> : The zenoh session mode. Default: peer Possible values: peer or client.
  See zenoh documentation for more details.
- -l, --listen <LOCATOR> : A locator on which this router will listen for incoming sessions. Repeat this option to open several listeners. Example of locator: tcp/localhost:7447.
- -e, --peer <LOCATOR> : A peer locator this router will try to connect to (typically another bridge or a zenoh router). Repeat this option to connect to several peers. Example of locator: tcp/<ip-address>:7447.
- --no-multicast-scouting : disable the zenoh scouting protocol that allows automatic discovery of zenoh peers and routers.
- -i, --id <hex_string> : The identifier (as an hexadecimal string - e.g.: 0A0B23...) that the zenoh bridge must use. WARNING: this identifier must be unique in the system! If not set, a random UUIDv4 will be used.
- --rest-http-port <rest-http-port> : set the REST API http port (default: 8000)
DDS-related arguments:
- -d, --domain <ID> : The DDS Domain ID. By default set to 0, or to "$ROS_DOMAIN_ID" is this environment variable is defined.
- --dds-localhost-only : If set, the DDS discovery and traffic will occur only on the localhost interface (127.0.0.1). By default set to false, unless the "ROS_LOCALHOST_ONLY=1" environment variable is defined.
- --dds-enable-shm : If set, DDS will be configured to use the Iceoryx shared memory PSMX plugin with default config. Requires the bridge to be built with the 'dds_shm' feature for this option to valid. By default set to false.
- -f, --fwd-discovery : When set, rather than creating a local route when discovering a local DDS entity, this discovery info is forwarded to the remote plugins/bridges. Those will create the routes, including a replica of the discovered entity. More details here
- -s, --scope <String> : A string used as prefix to scope DDS traffic when mapped to zenoh keys.
- -a, --allow <String> : A regular expression matching the set of 'partition/topic-name' that must be routed via zenoh. By default, all partitions and topics are allowed.
  If both 'allow' and 'deny' are set a partition and/or topic will be allowed if it matches only the 'allow' expression.
  Repeat this option to configure several topic expressions. These expressions are concatenated with '|'. Examples of expressions:
  - .*/TopicA will allow only the TopicA to be routed, whatever the partition.
  - PartitionX/.* will allow all the topics to be routed, but only on PartitionX.
  - cmd_vel|rosout will allow only the topics containing cmd_vel or rosout in their name or partition name to be routed.
- --deny <String> : A regular expression matching the set of 'partition/topic-name' that must NOT be routed via zenoh. By default, no partitions and no topics are denied.
  If both 'allow' and 'deny' are set a partition and/or topic will be allowed if it matches only the 'allow' expression.
  Repeat this option to configure several topic expressions. These expressions are concatenated with '|'.
- --max-frequency <String>... : specifies a maximum frequency of data routing over zenoh per-topic. The string must have the format "regex=float" where:
  - "regex" is a regular expression matching the set of 'partition/topic-name' for which the data (per DDS instance) must be routedat no higher rate than associated max frequency (same syntax than --allow option).
  - "float" is the maximum frequency in Hertz; if publication rate is higher, downsampling will occur when routing.
  (usable multiple times)
- --queries-timeout <Duration>: A duration in seconds (default: 5.0 sec) that will be used as a timeout when the bridge queries any other remote bridge for discovery information and for historical data for TRANSIENT_LOCAL DDS Readers it serves (i.e. if the query to the remote bridge exceed the timeout, some historical samples might be not routed to the Readers, but the route will not be blocked forever).
- -w, --generalise-pub <String> : A list of key expressions to use for generalising the declaration of the zenoh publications, and thus minimizing the discovery traffic (usable multiple times). See this blog for more details.
- -r, --generalise-sub <String> : A list of key expressions to use for generalising the declaration of the zenoh subscriptions, and thus minimizing the discovery traffic (usable multiple times). See this blog for more details.

Admin space

The zenoh bridge for DDS exposes an administration space allowing to browse the DDS entities that have been discovered (with their QoS), and the routes that have been established between DDS and zenoh. This administration space is accessible via any zenoh API, including the REST API that you can activate at zenoh-bridge-dds startup using the --rest-http-port argument.

Starting from version 0.11.0-rc.2, the zenoh-bridge-dds exposes this administration space with paths prefixed by @/<uuid>/dds (where <uuid> is the unique identifier of the bridge instance). The information is then organized with such paths:

@/<uuid>/dds/version : the bridge version
@/<uuid>/dds/config : the bridge configuration
@/<uuid>/dds/participant/<gid>/reader/<gid>/<topic> : a discovered DDS reader on <topic>
@/<uuid>/dds/participant/<gid>/writer/<gid>/<topic> : a discovered DDS reader on <topic>
@/<uuid>/dds/route/from_dds/<zenoh-resource> : a route established from a DDS writer to a zenoh key named <zenoh-resource> (see mapping rules).
@/<uuid>/dds/route/to_dds/<zenoh-resource> : a route established from a zenoh key named <zenoh-resource> (see mapping rules)..

For previous versions, see the corresponding version of README.md: 0.10.1-rc.

Example of queries on administration space using the REST API with the curl command line tool (don't forget to activate the REST API with --rest-http-port 8000 argument):

List all the DDS entities that have been discovered:
```
curl http://localhost:8000/@/*/dds/participant/**
```

List all established routes:

curl http://localhost:8000/@/*/dds/route/**

List all discovered DDS entities and established route for topic cmd_vel:
```
curl http://localhost:8000/@/*/dds/**/cmd_vel
```

Pro tip: pipe the result into jq command for JSON pretty print or transformation.

Architecture details

The zenoh bridge for DDS discovers all DDS Writers and Readers in a DDS system and routes each DDS publication on a topic T as a Zenoh publication on key expression T. In the other way, assuming a DDS Reader on topic T is discovered, it routes each Zenoh publication on key expression T as a DDS publication on topic T.

The bridge doesn't deserialize the DDS data which are received from DDS Writer as a SerializedPayload with the representation defined in §10 of the DDS-RTPS specification. Therefore, the payload published from any Zenoh application for a DDS Reader served by the bridge must have such format:

 0...2...........8...............16..............24..............32
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |   representation_identifier   |    representation_options     |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 ~                                                               ~
 ~ ... Bytes of data representation using a format that ...      ~
 ~ ... depends on the RepresentationIdentifier and options ...   ~
 ~                                                               ~
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Where the first 4 bytes (representation_identifier and representation_options) are usually {0x00, 0x0} for Big Endian encoding or {0x00, 0x01} for Little Endian encoding, and the remaining bytes are the data encoded in CDR.

In details, whether it's built as a library or as a standalone executable, it does the same things:

in default mode:
- it discovers the DDS readers and writers declared by any DDS application, via the standard DDS discovery protocol (that uses UDP multicast)
- it creates a mirror DDS writer or reader for each discovered reader or writer (using the same QoS)
- if maps the discovered DDS topics and partitions to zenoh keys (see mapping details below)
- it forwards user's data from a DDS topic to the corresponding zenoh key, and vice versa
- it does not forward to the remote bridge any DDS discovery information
in "forward discovery" mode
- each bridge will forward via zenoh the local DDS discovery data to the remote bridges (in a more compact way than the original DDS discovery traffic)
- each bridge receiving DDS discovery data via zenoh will create a replica of the DDS reader or writer, with similar QoS. Those replicas will serve the route to/from zenoh, and will be discovered by the ROS2 nodes.
- for ROS 2 systems, each bridge will forward the ros_discovery_info data (in a less intensive way than the original publications) to the remote bridges. On reception, the remote bridges will convert the original entities' GIDs into the GIDs of the corresponding replicas, and re-publish on DDS the ros_discovery_info. The full ROS graph can then be discovered by the ROS 2 nodes on each host.

Mapping of DDS topics to zenoh keys

The mapping between DDS and zenoh is rather straightforward: given a DDS Reader/Writer for topic A without the partition QoS set, then the equivalent zenoh key will have the same name: A. If a partition QoS P is defined, the equivalent zenoh key will be named as P/A.

Optionally, the bridge can be configured with a scope that will be used as a prefix to each zenoh key. That is, for scope S the equivalent zenoh key will be:

S/A for a topic A without partition
S/P/A for a topic A and a partition P

Mapping ROS 2 names to zenoh keys

The mapping from ROS 2 topics and services name to DDS topics is specified here. Notice that ROS 2 does not use the DDS partitions.
As a consequence of this mapping and of the DDS to zenoh mapping specified above, here are some examples of mapping from ROS 2 names to zenoh keys:

ROS2 names	DDS Topics names	zenoh keys (no scope)	zenoh keys (if scope="`myscope`")
topic: `/rosout`	`rt/rosout`	`rt/rosout`	`myscope/rt/rosout`
topic: `/turtle1/cmd_vel`	`rt/turtle1/cmd_vel`	`rt/turtle1/cmd_vel`	`myscope/rt/turtle1/cmd_vel`
service: `/turtle1/set_pen`	`rq/turtle1/set_penRequest` `rr/turtle1/set_penReply`	`rq/turtle1/set_penRequest` `rr/turtle1/set_penReply`	`myscope/rq/turtle1/set_penRequest` `myscope/rr/turtle1/set_penReply`
action: `/turtle1/rotate_absolute`	`rq/turtle1/rotate_absolute/_action/send_goalRequest` `rr/turtle1/rotate_absolute/_action/send_goalReply` `rq/turtle1/rotate_absolute/_action/cancel_goalRequest` `rr/turtle1/rotate_absolute/_action/cancel_goalReply` `rq/turtle1/rotate_absolute/_action/get_resultRequest` `rr/turtle1/rotate_absolute/_action/get_resultReply` `rt/turtle1/rotate_absolute/_action/status` `rt/turtle1/rotate_absolute/_action/feedback`	`rq/turtle1/rotate_absolute/_action/send_goalRequest` `rr/turtle1/rotate_absolute/_action/send_goalReply` `rq/turtle1/rotate_absolute/_action/cancel_goalRequest` `rr/turtle1/rotate_absolute/_action/cancel_goalReply` `rq/turtle1/rotate_absolute/_action/get_resultRequest` `rr/turtle1/rotate_absolute/_action/get_resultReply` `rt/turtle1/rotate_absolute/_action/status` `rt/turtle1/rotate_absolute/_action/feedback`	`myscope/rq/turtle1/rotate_absolute/_action/send_goalRequest` `myscope/rr/turtle1/rotate_absolute/_action/send_goalReply` `myscope/rq/turtle1/rotate_absolute/_action/cancel_goalRequest` `myscope/rr/turtle1/rotate_absolute/_action/cancel_goalReply` `myscope/rq/turtle1/rotate_absolute/_action/get_resultRequest` `myscope/rr/turtle1/rotate_absolute/_action/get_resultReply` `myscope/rt/turtle1/rotate_absolute/_action/status` `myscope/rt/turtle1/rotate_absolute/_action/feedback`
all parameters for node `turtlesim`	`rq/turtlesim/list_parametersRequest` `rr/turtlesim/list_parametersReply` `rq/turtlesim/describe_parametersRequest` `rr/turtlesim/describe_parametersReply` `rq/turtlesim/get_parametersRequest` `rr/turtlesim/get_parametersReply` `rr/turtlesim/get_parameter_typesReply` `rq/turtlesim/get_parameter_typesRequest` `rq/turtlesim/set_parametersRequest` `rr/turtlesim/set_parametersReply` `rq/turtlesim/set_parameters_atomicallyRequest` `rr/turtlesim/set_parameters_atomicallyReply`	`rq/turtlesim/list_parametersRequest` `rr/turtlesim/list_parametersReply` `rq/turtlesim/describe_parametersRequest` `rr/turtlesim/describe_parametersReply` `rq/turtlesim/get_parametersRequest` `rr/turtlesim/get_parametersReply` `rr/turtlesim/get_parameter_typesReply` `rq/turtlesim/get_parameter_typesRequest` `rq/turtlesim/set_parametersRequest` `rr/turtlesim/set_parametersReply` `rq/turtlesim/set_parameters_atomicallyRequest` `rr/turtlesim/set_parameters_atomicallyReply`	`myscope/rq/turtlesim/list_parametersRequest` `myscope/rr/turtlesim/list_parametersReply` `myscope/rq/turtlesim/describe_parametersRequest` `myscope/rr/turtlesim/describe_parametersReply` `myscope/rq/turtlesim/get_parametersRequest` `myscope/rr/turtlesim/get_parametersReply` `myscope/rr/turtlesim/get_parameter_typesReply` `myscope/rq/turtlesim/get_parameter_typesRequest` `myscope/rq/turtlesim/set_parametersRequest` `myscope/rr/turtlesim/set_parametersReply` `myscope/rq/turtlesim/set_parameters_atomicallyRequest` `myscope/rr/turtlesim/set_parameters_atomicallyReply`
specific ROS discovery topic	`ros_discovery_info`	`ros_discovery_info`	`myscope/ros_discovery_info`

Name		Name	Last commit message	Last commit date
Latest commit History 639 Commits
.cargo		.cargo
.github		.github
zenoh-bridge-dds		zenoh-bridge-dds
zenoh-plugin-dds		zenoh-plugin-dds
.gitignore		.gitignore
.pre-commit-config.yaml		.pre-commit-config.yaml
CMakeLists.txt		CMakeLists.txt
CONTRIBUTING.md		CONTRIBUTING.md
CONTRIBUTORS.md		CONTRIBUTORS.md
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
Cross.toml		Cross.toml
DEFAULT_CONFIG.json5		DEFAULT_CONFIG.json5
Dockerfile		Dockerfile
LICENSE		LICENSE
NOTICE.md		NOTICE.md
README.md		README.md
package.xml		package.xml
rust-toolchain.toml		rust-toolchain.toml
zenoh-dragon.png		zenoh-dragon.png

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Eclipse Zenoh

DDS plugin and standalone `zenoh-bridge-dds`

Background

⚠️ On usage with ROS 2 ⚠️

Plugin or bridge ?

How to install it

Manual installation (all platforms)

Linux Debian

How to build it

Enabling Cyclone DDS Shared Memory Support

Shared Memory Limitations

ROS 2 package

Docker image

Usage

Configuration

Admin space

Architecture details

Mapping of DDS topics to zenoh keys

Mapping ROS 2 names to zenoh keys

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eclipse-zenoh/zenoh-plugin-dds

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Eclipse Zenoh

DDS plugin and standalone zenoh-bridge-dds

Background

⚠️ On usage with ROS 2 ⚠️

Plugin or bridge ?

How to install it

Manual installation (all platforms)

Linux Debian

How to build it

Enabling Cyclone DDS Shared Memory Support

Shared Memory Limitations

ROS 2 package

Docker image

Usage

Configuration

Admin space

Architecture details

Mapping of DDS topics to zenoh keys

Mapping ROS 2 names to zenoh keys

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DDS plugin and standalone `zenoh-bridge-dds`

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