Help!! After a while Django no longer send information to client

Here is My Django code

@channel_session

def ws_connect(message):

    # Extract the room from the message. This expects message.path to be of the

    # form /chat/{label}/, and finds a Room if the message path is applicable,

    # and if the Room exists. Otherwise, bails (meaning this is a some othersort

    # of websocket). So, this is effectively a version of _get_object_or_404.

    try:

        # prefix, label = message['path'].decode('ascii').strip('/').split('/')

        prefix, label = message['path'].strip('/').split('/')

        if prefix != 'chat':

            log.debug('invalid ws path=%s', message['path'])

            return

        room, created = Room.objects.get_or_create(label=label)

    except ValueError:

        log.debug('invalid ws path=%s', message['path'])

        return

    except Room.DoesNotExist:

        log.debug('ws room does not exist label=%s', label)

        return

    log.debug('chat connect room=%s client=%s:%s',

              room.label, message['client'][0], message['client'][1])

    # Need to be explicit about the channel layer so that testability works

    # This may be a FIXME?

    Group('chat-' + label, channel_layer=message.channel_layer).add(message.reply_channel)

    message.channel_session['room'] = room.label

@channel_session

def ws_receive(message):

    # Look up the room from the channel session, bailing if it doesn't exist

    try:

        label = message.channel_session['room']

        room = Room.objects.get(label=label)

    except KeyError:

        log.debug('no room in channel_session')

        return

    except Room.DoesNotExist:

        log.debug('recieved message, buy room does not exist label=%s', label)

        return

    # Parse out a chat message from the content text, bailing if it doesn't

    # conform to the expected message format.

    try:

        # data = json.loads(message['bytes'].decode(errors='replace'))

        tcl_json_info = message['bytes'].decode('utf-8', errors="replace").strip()

        tcl_json_info = tcl_json_info.replace("\n", "\\n")

        tcl_json_info = tcl_json_info.replace("\r", "\\r")

        tcl_json_info = tcl_json_info.replace("\t", "\\t")

        # data = json.loads(tcl_json_info)

        data = ast.literal_eval(tcl_json_info)

    except ValueError:

        log.debug("ws message isn't json binary=%s", data)

        return

    if set(data.keys()) != set(('newline', 'mf', 'message', 'level', 'timestamp', 'color', 'type')):

        log.debug("ws message unexpected format data=%s", data)

        return

    if data:

        log.debug('chat message room=%s timestamp=%s newline=%s mf=%s level=%s color=%s type=%s message=%s',

                  room.label, data['timestamp'], data['newline'], data['mf'], data['level'], data['color'], data['type'], data['message'])

        # with transaction.atomic():

        #     m = room.messages.create(**data)

        # m = room.messages.create(**data)

        # See above for the note about Group

        # Group('chat-' + label, channel_layer=message.channel_layer).send({'text': json.dumps(m.as_dict())})

        Group('chat-' + label, channel_layer=message.channel_layer).send({'text': json.dumps(data)})

Here is my javascript code:

    ws.onopen = function (evt) {

      var keepAliveMsg = {newline: '1', mf: '0',message: '',level: 'info',timestamp: '0',color: 'black',type: 'buffer'};

      // var byteArray = new Uint8Array(keepAliveMsg);

      var blob = new Blob([JSON.stringify(keepAliveMsg)]);

      ws.interval_event = $interval(function () {

        ws.send(blob);

      }, 5000)

    };

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