Constant CEILING_14 

const CEILING_14: &str = "If a Request ID equal to or larger than this is received by the endpoint \
                          that sent the MAX_REQUEST_ID in any request message (PUBLISH_NAMESPACE, \
                          FETCH, SUBSCRIBE, SUBSCRIBE_NAMESPACE, SUBSCRIBE_UDPATE or \
                          TRACK_STATUS), the endpoint MUST close the session with an error of \
                          TOO_MANY_REQUESTS.";