Trigger open frameworks over network by php [solved]

beginners
#1

Hi all,

I’d like to ask advice on what approach/package to use for the following task:
I have a pi with openFrameworks inside a Network. I have a Computer running a CMS (TYPO3) without openFramewoks in the same Network. I now like to trigger the pi from the CMS directly, that is, by using php/html.

I would be happy for any hints.

Thanks!
oe

#2

Your TYPO3 app could publish a page with a message, and the raspberry could read that message.
Have a look at this ofHttpRequest and ofHttpResponse, and at some thread in the forum searching for this keywords, like this Raspberry Pi2 problems with HTTP requests

#3

Thanks edapx!
I checked into this and it would definetely be a possibility. But if I understand correct, this means that my pi would continously call a web page, so causes traffic all day long. Because I have to work in a busy network, I hope to find a possibility where the php does the call, only if necessary. And the pi just waits for being pinged.
Is there an approach for this, too?

#4

In this case, your Typo3 will publish a message that trig an event on the raspberry. You can use websockets http://viget.com/extend/web-interfacing-with-arduino

If you are familiar with ruby, have a look at http://blog.meinside.pe.kr/Sending-notifications-through-Pushbullet-on-Raspberry-Pi/

#5

also ofxHttpServer and ofxHttp have an http server implementation that you can use to get pinged from another machine

#6

I was experimenting with OSC and a wordpress backend, using http://opensoundcontrol.org/implementation/open-sound-control-php.
There is an example in test_osc_lib function.

#7

similar to thomas’ suggestion: i’ve used a lightweight command line osc sender which was triggered from a php page using the php’s shell_exec function. (in php: shell_exec (’./oscSender localhost 7777 /doThisThing’);

The OF app used ofxOscReceiver to receive the php triggers.

#8

Hi all, OSC is tempting but as far as I understood the php version is using UPD, not TCP as Protocol. For I have a busy network and I will need error checking this is not the way to go. I’ll learn about networks, ofxHttpServer and ofxHttp and keep you updated - in case I find a solution.

#9

Hi all,

Thanks to all who helped me in this. Here’s what I did:
I set up an App with ofxHTTP. I basically used the example for Basic Post Server. Inside this there is a function called:

void ofApp::onHTTPPostEvent(ofx::HTTP::PostEventArgs& args)

which is triggered every time a POST form is sent. In this funtion I also get the arguments transmitted by the form. So the solution is easy in the end:
I change the form which is provided by the example to a very simple Form only using one hidden field. I then use Javascript to read the arguments I pass in an URL, fill these arguments to the hidden field and send the form.

<script type="text/javascript">
  window.onload = function(){
    var getString = window.location.search.replace("?", "");
    var getVideoID = getString.replace("videoId=", "");  
    document.getElementById('videoInputField').value=getVideoID;
    document.forms['videoForm'].submit();
  }
</script>
    
    ...
    
<form role="form" action="/post" id="videoForm" method="post" enctype="text/plain">
  <div class="form-group">
     <input type="hidden" id="videoInputField" name="run_video" value="1"></input>
  </div>
  <button type="submit" class="btn btn-default">Submit</button>
</form>

So in the end I call a URL like

192.168.5.25/runVideo.html?videoId=2

Javascript reads the arguments ("?videoId=2"), prepares them, fills the value “2” in the hidden field and sends the form. In openFrameworks the function “onHTTPPostEvent” is fired, I get a string like

run_video=2

as argument. I just have to prepare it again and that’s it: I can trigger an event by calling a URL and pass on a variable at the same time.

Have a good day!
oe

1 Like
#10

Nice!