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LoRaWAN ® Certification Protocol Specification TS009-1.1.0 ©2023 LoRa Alliance ® Page 22 of 26 The authors reserve the right to change specifications without notice. 5.16 Class B Beacon Counter Commands (BeaconCntReq, 520 BeaconCntAns, BeaconCntRstReq) 521 522 The BeaconCntReq command requests the DUT to provide the current BeaconCnt value. 523 This command has no payload. 524 525 The DUT answers the BeaconCntReq with a BeaconCntAns command. 526 527 Size (octets) 2 Field BeaconCnt Table 16: BeaconCntAns 528 The BeaconCntRstReq command requests the DUT to reset the BeaconCnt value to 0. This 529 command has no payload. 530 531 The TCL can verify the correct operation of the BeaconCntRstReq command by issuing a 532 BeaconCntReq command. 533 5.17 SCHC Message Commands (SCHCMsgSendReq, 534 SCHCMsgSendAns) 535 536 The SCHCMsgSendReq command requests the DUT to send an uplink SCHC message 537 where the UDPAppPort and DataSize are specified.. The UDPAppPort must be used by 538 the DUT in building the UDP header. The DataSize provides the size (in bytes) of the data 539 (all zeros) to add in the message payloads. 540 541 Size (octets) 2 2 Fields UDPAppPort DataSize Table 17: SCHCMessageSendReq 542 The DUT answers the SCHCMsgSendReq with a SCHCMsgSendAns command. The 543 SCHCMsgSendAns has no payload. 544 5.18 SCHC Acknowledge Indication Command (SCHCACKInd) 545 546 The SCHCACKInd command SHALL be sent from the DUT to the TCL after it has received 547 the complete downlink session from the TCL. The SCHCACKInd payload contains the IPv6 548 headers, UDP headers, and data. 549 550 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 551 552 553 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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