Issue link: https://read.uberflip.com/i/1464684
LoRaWAN ® Remote Multicast Setup Specification TS005-2.0.0 ©2022 LoRa Alliance ® Page 13 of 21 The authors reserve the right to change specifications without notice. McGroupUndefined is set to 0 and McGroupID is set to the ID of the deleted multicast 392 group. 393 4.5 Multicast Class C Session Commands (McClassCSessionReq, 394 McClassCSessionAns) 395 396 These commands are used to set up a temporary Class C multicast session associated with 397 a multicast context. 398 399 The following unicast and multicast class combinations are allowed: 400 Multicast Class C Session Unicast Class A Allowed and can have different parameters (unicast Class A takes priority) Unicast Class A+B Not allowed simultaneously Unicast Class A+C Allowed and can have different parameters (unicast Class A takes priority, then multicast Class C, then unicast Class C) 401 Note: Unicast Class B-enabled devices should disable Class B before 402 participating in multicast Class C sessions. 403 404 "A given class taking priority" means that the end-device tunes its receiver to the channel 405 parameters of the said class even when there is overlapping reception of another class. 406 407 The payload of the message is: 408 409 Size (octets) 1 4 1 3 1 Field McGroupIDHeader Session Time SessionTimeOut DLFreq DR Table 16: McClassCSessionReq 410 Where: 411 Bits 7:2 1:0 McGroupIDHeader Fields RFU McGroupID Table 17: McClassCSessionReq McGroupIDHeader format 412 McGroupID is the identifier of the multicast group being used. 413 414 SessionTime is the start of the Class C window and is expressed as the time in seconds 415 since 00:00:00, Sunday 6 th of January 1980 (start of the GPS epoch) modulo 2 32 . Note that 416 this is the same format as the Time field in the LoRaWAN Class B beacon frame described 417 in the LoRaWAN Link Layer Specification [TS001]. 418 Note: This command can only schedule Class C sessions up to about 419 194 days in the future because the McClassCSessionAns 420 TimeToStart field size is 3 bytes. 421 422 Bits 7:4 3:0 SessionTimeOut Fields RFU TimeOut Table 18: McClassCSessionReq SessionTimeOut format 423