Using ros2-web-bridge for Node-Red implementation

[a-pastore]

Hello all,

i would like to ask you if anyone here already has experience with the connection between ROS2 and node-red. I was hoping to use the ros2-web-bridge in combination with the following node-red-module to create a web-based joystick, for instance.

node-red-contrib-ros

The following system is used in a VM:

• Ubuntu 20.04 LTS
• ROS2: Foxy Fitzroy
• ros2-web-bridge: 0.3.0
• node: 10.19.0
• npm: 6.14.11
• node-red: 1.2.2

Can someone please assist with the following confusion? Is it enough to directly access the websocket ws://127.0.0.1:9090 to access the ROS2 Topics? Or does the ros2-web-bridge differ in this respect from the ROSbridge based on this tutorial?

The connection status of the Node-Red pub/sub indicates a successful connection. Unfortunately, ROS2 messages neither get in nor out. After connecting for the first time, the following is output in the webbridge terminal:

(node:13026) DeprecationWarning: Deep requiring like const uuidv4 = require('uuid/v4');is deprecated as of uuid@7.x. Please require the top-level module when using the Node.js CommonJS module or use ECMAScript Modules when bundling for the browser. See https://github.com/uuidjs/uuid#deep-requires-now-deprecated for more information.

Thank you for your time

[minggangw]

Theoretically, I think it's feasible to use ros2-web-bridge to replace the ROS bridge because ros2-web-bridge is designed to be compatible with roslibjs and follows the rosbridge v2 protocol.

The warning you mentioned is not critical, please try to run the ros2-web-bridge:

DEBUG=ros2-web-bridge* node bin/rosbridge.js

to find any meaningful output. For Node.js, I suggest you upgrade to v12.20.1.

[vkuehn]

@a-pastore interesting project !
It looks like you are using an older node version. Look here Node Red Supported Versions.
Maybe you want to forward ROS2 as an issue to https://github.com/namgk/node-red-contrib-ros ?