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LoRaWAN ® Certification Protocol Specification TS009-1.2.1 ©2024 LoRa Alliance ® Page 22 of 27 The authors reserve the right to change specifications without notice. 5.16 Class B Beacon Counter Commands (BeaconCntReq, 525 BeaconCntAns, BeaconCntRstReq) 526 527 The BeaconCntReq command requests the DUT to provide the current BeaconCnt value. 528 This command has no payload. 529 530 The DUT answers the BeaconCntReq with a BeaconCntAns command. 531 532 Size (octets) 2 Field BeaconCnt Table 16: BeaconCntAns 533 The BeaconCntRstReq command requests the DUT to reset the BeaconCnt value to 0. This 534 command has no payload. 535 536 The TCL can verify the correct operation of the BeaconCntRstReq command by issuing a 537 BeaconCntReq command. 538 5.17 SCHC Message Commands (SCHCMsgSendReq, 539 SCHCMsgSendAns) 540 541 The SCHCMsgSendReq command requests the DUT to send an uplink SCHC message 542 where the UDPAppPort and DataSize are specified.. The UDPAppPort must be used by 543 the DUT in building the UDP header. The DataSize provides the size (in bytes) of the data 544 (all zeros) to add in the message payloads. 545 546 Size (octets) 2 2 Fields UDPAppPort DataSize Table 17: SCHCMessageSendReq 547 The DUT answers the SCHCMsgSendReq with a SCHCMsgSendAns command. The 548 SCHCMsgSendAns has no payload. 549 5.18 SCHC Acknowledge Indication Command (SCHCACKInd) 550 551 The SCHCACKInd command SHALL be sent from the DUT to the TCL after it has received 552 the complete downlink session from the TCL. The SCHCACKInd payload contains the IPv6 553 headers, UDP headers, and data. 554 555 Size (bits) 4 8 20 16 8 8 64 64 Fields IPv6 version IPv6 Diffserv IPv6 Flow label IPv6 length IPv6 next header IPv6 Hop limit IPv6 DevPrefix IPv6 DevIID 556 557 558 Size (bits) 64 64 16 16 16 16 [8- 480] Fields IPv6 AppPrefix IPv6 AppIID UDP DevPort UDP AppPort UDP length UDP checksum Data

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