/**
 * connect to server
 */ 
async function connect() {
    // hide modal
    $('#entranceModal').modal('hide');
    // disable controls
    cControls.muteInput();
    //create peer connection
    const pc = new RTCPeerConnection();
    //get config object for room creation
    const roomConfig = cControls.roomConfig();
    //kick off connect to server and local room creation
    try {
        const session = await sfu.createRoom(roomConfig);
        // Now we connected to the server (if no exception was thrown)
        session.on(constants.SFU_EVENT.FAILED, function (e) {
            if (e.status && e.statusText) {
                displayError("CONNECTION FAILED: " + e.status + " " + e.statusText);
            } else if (e.type && e.info) {
                displayError("CONNECTION FAILED: " + e.info);
            } else {
                displayError("CONNECTION FAILED: " + e);
            }
        }).on(constants.SFU_EVENT.DISCONNECTED, function (e) {
            displayError("DISCONNECTED. Refresh the page to enter the room again");
        });
        const room = session.room();
        room.on(constants.SFU_ROOM_EVENT.FAILED, function (e) {
            displayError(e);
        }).on(constants.SFU_ROOM_EVENT.OPERATION_FAILED, function (e) {
            displayError(e.operation + " failed: " + e.error);
        })

        // create local display to show local streams
        localDisplay = initLocalDisplay(document.getElementById("localDisplay"));
        // display audio and video control tables
        await cControls.displayTables();
        cControls.onTrack(async function (s) {
            await publishNewTrack(room, pc, s);
        });
        //create and bind chat to the new room
        const chatDiv = document.getElementById('messages');
        const chatInput = document.getElementById('localMessage');
        const chatButton = document.getElementById('sendMessage');
        createChat(room, chatDiv, chatInput, chatButton);

        //setup remote display for showing remote audio/video tracks
        const remoteDisplay = document.getElementById("display");
        initDefaultRemoteDisplay(room, remoteDisplay, {quality: true},{thresholds: [
                {parameter: "nackCount", maxLeap: 10},
                {parameter: "freezeCount", maxLeap: 10},
                {parameter: "packetsLost", maxLeap: 10}
            ], abrKeepOnGoodQuality: ABR_KEEP_ON_QUALITY, abrTryForUpperQuality: ABR_TRY_UPPER_QUALITY, interval: ABR_QUALITY_CHECK_PERIOD});

        //get configured local video streams
        let streams = cControls.getVideoStreams();
        //combine local video streams with audio streams
        streams.push.apply(streams, cControls.getAudioStreams());

        // Publish preconfigured streams
        publishPreconfiguredStreams(room, pc, streams);
    } catch (e) {
        console.error(e);
        displayError(e);
    }
}