TheLoRaWAN1.0.3nowfullysupportsunicast&multicastclassBdevices.TheclassAandclassCsectionsareunchangedcomparedtoLoRaWAN1.0.2withtheexceptionofanewMACcommand"DeviceTimeRequest"usedtosynchronizetherealtimeclockofadevice.FordevicesoperatinginclassAorclassC,thereisnoneedtoup