Issue link: https://read.uberflip.com/i/1428350
LoRaWAN Remote Multicast Setup v1.0.0 Specification ©2018 LoRa Alliance™ Page 15 of 18 The authors reserve the right to change specifications without notice. The end-device acknowledges the reception of this message by sending a 455 McClassBSessionAns message on the same port with the following payload: 456 457 Field Status&McGroupID (cond)TimeToStart Size (bytes) 1 3 Table 23: McClassBSessionAns 458 Where: 459 460 Status&McGroupID Fields RFU McGroupUndefined FreqError DRError McGroupID Size (bits) 3bits 1bit 1bit 1bit 2bits Table 24: McClassBSessionAns Status&McGroupID field 461 462 FreqError bit is set to 1 if the DLFrequ frequency set by the network is not usable for the 463 end-device. 464 465 DRError bit is set to 1 if the classB downlink Data Rate set by the network is not defined. 466 467 McGroupUndefined is set 1 if the McGroupID specified by the command is not defined in the 468 end-device (was not created before calling this command). 469 470 If no errors are present, the TimeToStart field encodes the number of seconds from the 471 McClassBSessionAns uplink to the beginning of the multicast fragmentation session. This 472 allows the server to check that the end-device clock is roughly synchronized and that it will 473 effectively start acquiring the classB beacon at the right moment (before the beginning of the 474 classB multicast session with some margin). 475