Start of connecting ofxLibwebsockets with socket.io. Not finished and probably won't ever be...

ofxLibwebsockets_socketio_client.h

#include "ofApp.h"

string sid = "";

//--------------------------------------------------------------
void ofApp::setup(){
    ofSetLogLevel(OF_LOG_VERBOSE);
    ofxLibwebsockets::ClientOptions opts = ofxLibwebsockets::defaultClientOptions();
    opts.channel = "/socket.io/1/websocket?EIO=2&transport=websocket&sid=";
    opts.port = 3000;
    client.connect(opts);
//    client.connect("echo.websocket.org", true); // optionally use SSL
    ofSetLogLevel(OF_LOG_ERROR);
    
    client.addListener(this);
    ofSetFrameRate(60);
}

//--------------------------------------------------------------
void ofApp::update(){
}

//--------------------------------------------------------------
void ofApp::draw(){
}

//--------------------------------------------------------------
void ofApp::onConnect( ofxLibwebsockets::Event& args ){
    cout<<"on connected"<<endl;
}

//--------------------------------------------------------------
void ofApp::onOpen( ofxLibwebsockets::Event& args ){
    cout<<"on open"<<endl;
}

//--------------------------------------------------------------
void ofApp::onClose( ofxLibwebsockets::Event& args ){
    cout<<"on close"<<endl;
}

//--------------------------------------------------------------
void ofApp::onIdle( ofxLibwebsockets::Event& args ){
    cout<<"on idle"<<endl;
}

//--------------------------------------------------------------
void ofApp::onMessage( ofxLibwebsockets::Event& args ){
    cout<<"got message "<<args.message<<endl;
    // control is first char of message
    int control = ofToInt(args.message.substr(0,1));
    
    bool bGoodJson = false;
    
    // messages with len > 1 have some sort of data
    if ( args.message.length() > 1 ){
        string m = args.message.substr(1);
        static Json::Reader reader;
        reader.parse(m, args.json);
        bGoodJson = !args.json.isNull();
    }
    if ( bGoodJson ){
        switch (control) {
            case 0:
                if ( args.json["sid"] != NULL ) {
                    sid = args.json["sid"].asString();
                    cout << sid << endl;
                }
                break;
            case 1:
                //??
                break;
            case 2:
            {
                //Ping->Pong
                stringstream out;
                out<<"3:"<<args.json;
                client.send(out.str());
            }
                break;
            case 3:
                // message
                break;
            case 4:
                // control event
                break;
            case 5:
                //Upgrade Required
                break;
            case 6:
                //Noop
                break;
                
            default:
                break;
        }
    }
}

//--------------------------------------------------------------
void ofApp::onBroadcast( ofxLibwebsockets::Event& args ){
    cout<<"got broadcast "<<args.message<<endl;    
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

    client.send("{\"type\":\"message\", \"data\":\"Hello\"}");
	cout << "sending hello" <<endl;
}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){

}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){
}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}