[LoRaWAN] 1. [Pre-Certification] 2. Added certification test items for DUTs classified as END-DEVICE, as defined in the Relay Mechanism Test Specification. [RF Performance] ​3. Added system clock offset vs. PER function to RX Sensitivity. The system clock offset is adjusted in ppm units. This function ​tests how much clock offset the device can tolerate by varying the system clock of packets transmitted from the RWC5020X ​ ​and measuring the reception limit. This function is available only for RWC5020B/M [NST] ​4. [Link Analyzer] ​5. Added End-device under Relay test mode to EDT. When RELAY_MODE is set to ON, the RWC5020X emulates the ​ ​complete system including Network Server, Gateway, and Relay. In this mode, the RWC5020x receives WOR messages ​ ​sent by the DUT and responds with WOR ACK as needed, providing an environment that simulates DUT communication with a Relay. ​6. When calculating the MIC for the FragSessionSetupReq used in FUOTA, we originally included the message padding. Due to a customer request, we modified the firmware in V1.513 ​to exclude the padding from the MIC calculation. However, we believe this change was incorrect. We have therefore reverted the modification once again include the padding in the MIC calculation. | 