def send_message(host, data, timeout=None, properties=None):
    """
    Send message to given `host`.

    Args:
        host (str): Specified host: aleph/ftp/whatever available host.
        data (str): JSON data.
        timeout (int, default None): How much time wait for connection.
    """
    channel = _get_channel(host, timeout)

    if not properties:
        properties = pika.BasicProperties(
            content_type="application/json",
            delivery_mode=2,
            headers={"UUID": str(uuid.uuid4())}
        )

    parameters = settings.get_amqp_settings()[host]

    channel.basic_publish(
        exchange=parameters["exchange"],
        routing_key=parameters["in_key"],
        properties=properties,
        body=data
    )