3.1.6 Timer Events
Retry Timer Event: If the client receives an HTTP 429 response code from the device management service, the retry timer (see section 3.1.2 Timers) SHOULD<14> use the “Retry-After” field value in the response specified by the device management service before resubmitting a request. The HTTP 429 response code indicates the user has sent too many requests in a given amount of time to the device management service.