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TS005-2.0.0 Remote Multicast Setup

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LoRaWAN ® Remote Multicast Setup Specification TS005-2.0.0 ©2022 LoRa Alliance ® Page 12 of 21 The authors reserve the right to change specifications without notice. Note: As LoRaWAN FCnt is transported over a 2-octet field, it is 360 recommended that when setting a multicast group, the value of the 361 McFCnt range is as small as possible to avoid multiple checks if the 362 MIC computation using the current 2 upper octets of FCnt is not valid. 363 364 The end-device SHALL acknowledge the reception of this message by sending an 365 McGroupSetupAns message with the following payload: 366 367 Size (octets) 1 Field McGroupIDHeader Table 10: McGroupSetupAns 368 Where: 369 Bits 7:3 2 1:0 McGroupIDHeader Fields RFU IDerror McGroupID Table 11: McGroupSetupAns McGroupIDHeader format 370 When set, the IDerror bit indicates that the end-device does not support the multicast 371 context indexed by the McGroupID requested by the server. For example, an end-device 372 MAY only support a single multicast group (McGroupID=0). If the server tries to create a 373 second multicast group with McGroupID=1, the end-device SHALL respond with 374 IDerror=1. 375 4.4 Multicast Group Delete Commands (McGroupDeleteReq, 376 McGroupDeleteAns) 377 378 These commands are used to delete a multicast group from an end-device. The command 379 payload is: 380 381 Size (octets) 1 Field McGroupIDHeader Table 12: McGroupDeleteReq 382 Where: 383 Bits 7:2 1:0 McGroupIDHeader Fields RFU McGroupID Table 13: McGroupDeleteReq McGroupIDHeader format 384 The end-device SHALL answer with McGroupDeleteAns with the following payload: 385 386 Size (octets) 1 Field McGroupIDHeader Table 14: McGroupDeleteAns 387 Where: 388 Bits 7:3 2 1:0 McGroupIDHeader Fields RFU MCGroupUndefined McGroupID Table 15: McGroupDeleteAns McGroupIDHeader format 389 MCGroupUndefined is set to 1 if the McGroupID specified by the command is not 390 defined in the end-device (was not created before calling the delete command). Otherwise, 391

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