Connect To Ez-b Or ARC Via Html5 Web Socket

Question

I saw that you can open up a telnet connection to ARC .

That's very cool.

I really want to use JavaScript to program my robot.

If I could connect to ARC via an html5 web socket, where all data that comes in from the ez-b is transferred across the connection, that would be very cool.

Will ez-robot ever support something like this?

mcbaker01 · Answer

https://en.wikipedia.org/wiki/WebSocket

GIjim · Answer

Looks like you could use javascript now, if you were to implement the other end of the websocket to talk to telnet. Kinda overcomplicating things, but it would be possible.

mcbaker01 · Answer

Yeah, I could but its a hack. Also, I'm asking about new functionality. In a component config panel, I imagine there would be an "event definition" section. For example, an accelerometers config panel would allow: If the x vector reaches value N trigger event "tip" sending values x and N. If the x vector changes at a rate (r) above value M, trigger event "bump" sending values x, r and M These "events" would be pushed out over the socket along with contextual event data. Also, web sockets allow for binary data transfer while telnet is text only. This would allow a camera on a robot to send image data to ARC which would then send an event "photograph" along with raw image data. Implementing a web socket event server would be a programmers dream come true

mattbrailsford · Answer

Maybe something like SignalR could be used? It's based on .NET and will be part of the next .NET framework release. I've used it a few times and it's very cool. Worth looking into at least.

DJ Sures · Answer

What is it you would like to do? - The camera image can already be obtained by the built-in HTTP server - Enabling the Connection Control TCP Server but disabling Script Interfae will allow direct EZ-Robot Protocol Commands to be sent. This can either be another ARC instance, or your own application. To reference the EZ-Robot Protocol, visit the EZ-OpenBot library: https://code.google.com/p/ez-openbot I could add an EZ-Script interface to the HTTP Server. It is now added to the to-do list

mcbaker01 · Answer

Could events be defined in ARC which would be pushed out to a web socket? For example, for an ARC temperature control, if the temp hits say 90C, event "hot" occurs which pushes "hot:90" out the web socket. The parameters and names for these event would be user entered of course.

DJ Sures · Answer

Sure, use the ez-script browse() command There is a large manual of ez-script commands in ARC. Click the link to install. The add control button will allow you to scroll throug the categories of controls with the arrow keys The scripting section might be of most interest to you

DJ Sures · Answer

https://synthiam.com/Community/Questions/2334

mcbaker01 · Answer

Cool, new features! Thanks!

I'll play around with it, see if I can make it work.

It will be interesting to see how the HTTP service works out.

HTTP is stateless, not a dedicated connection so it seems like it would be more useful for some operations more than others.

mcbaker01

Connect To Ez-B Or ARC Via Html5 Web Socket

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