Auto detect robot IP address (web servers/services)

[Balnian]

Description:

Add a UDP listener on a predetermined port to listen to a broadcast from a robot containing the robot's rosbridge and video server address.

Broadcast will come from a node on the robot.
The broadcast will contain a Robot Web Services ( RWS ) message which is a JSON structure giving:

• Version of the protocol (1.0.0)
• Robot's Name (Takin)
• Web API provider address (Rosbridge)
• Web Video Server address (Web_video_server)

This would be connected to a Combo Box in the UI to display a list of broadcast received to choose from and still allow to enter a manual address and have cached values.

Preliminary numbers:

• Broadcast is every 0.5 seconds

• Values stored expire after 1.5 seconds after last broadcast received (aka every broadcast reset the expiration timer)

Tasks:

• UDP listener in electron
• Combo box in UI
• Backing store???

[IceSentry]

I'm not sure it should be a combo box. Maybe it should just detect the IP, but if it detects a change to the input box then stop looking for an IP and use the one given by the user.

Or maybe a button with "Configure IP" and this will toggle enable status of the input box.

[lit-af]

I think I found a backend package for this!
https://fkie.github.io/multimaster_fkie/master_discovery.html