UPF Registration
Once the minimal configuration is done, the UPF triggers the registration procedure toward the NRF. The Nrfmgr proclet receives the configuration from the SessCtrl, and selects the endpoint with the lowest priority-number. If Nrfmgr does not receive response from the NRF for a retry, then Nrfmgr selects the endpoint with the next lowest priority-number. This process continues with all the endpoints endlessly. To stop this process, you must delete the configuration.