added host argument and new default for 0.0.0.0

[techtasie]

It makes sense to allow connections from remote hosts if you want to run FlexBE on a robot and the WebUI on your PC.

[Maik13579]

You must replace localhost in ros_subscriber.js. (line 6)
Without this change, you can modify behaviors but can't execute them.
Tested on the Jazzy branch.

https://github.com/FlexBE/flexbe_webui/blob/main/flexbe_webui/app/ros/ros_subscriber.js?plain=1#L6

[dcconner]

@techtasie

Sorry for the delay, I'm getting back to this, and hope to get this merged this month.

Our normal mode is that the OCS (mirror + server + client) runs remote from the robot, but we should allow multiple computers on OCS network to run client, so I appreciate this PR.

I'm inclined to make 127.0.0.1 the default not 0.0.0.0 to make the default more secure and limit access by default.

For @Maik13579 's comment, ChatGPT suggests:

const wsProto = window.location.protocol === "https:" ? "wss:" : "ws:";
const wsHost = window.location.host;  // e.g., "192.168.1.20:8000" or "mydomain.com"
const ws = new WebSocket(`${wsProto}//${wsHost}/ws/${topic.replaceAll('/', '-')}`);

This is currently untested.

I need to run these changes by some folks more attuned to cybersecurity than I am.

[dcconner]

See https://github.com/FlexBE/flexbe_webui/tree/pr/8 for latest code.

@Maik13579 or @techtasie can you test the branch pr/8 branch on your systems?

I'm keeping this PR open for discussion, but plan to close and merge from that branch if it checks out as pr/8 branch is rebased with latest changes .