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LoRaWAN® Application Layer Clock Synchronization Specification v1.0.0

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LoRaWAN Application Layer Clock Synchronization v1.0.0 Specification ©2018 LoRa Alliance™ Page 6 of 13 The authors reserve the right to change specifications without notice. 3 Clock synchronization Message Package 125 126 The identifier of the clock synchronization package is 1. The version of this package is 127 version 1. 128 129 The following messages are sent to/from each end-device individually using Unicast uplink 130 or downlink on a port specifically used for the clock synchronization package. The default 131 port value is 202. These messages MUST NOT be sent using multicast. If these messages 132 are received on a multicast address the end-device MUST drop them silently. 133 134 All unicast control messages use the same format: 135 Command1 Command1 Payload Command2 Command2 payload …. 136 A message MAY carry more than one command. The length of each command's payload is 137 fixed and a function of the command. Commands are executed from first to last. Each 138 command MUST be individually acknowledged by the end-device. 139 140 The following table summarizes the list of the clock synchronization messages 141 142 CID Command name Transmitted by Short Description End- device server 0x00 PackageVersionReq x Used by the AS to request the package version implemented by the end-device 0x00 PackageVersionAns x Conveys the answer to PackageVersionReq 0x01 AppTimeReq x Used by end-device to request clock correction 0x01 AppTimeAns x Conveys the clock timing correction 0x02 DeviceAppTimePeriodicityReq x Used by the application server for 2 purposes: Set the periodicity at which the end- device shall transmit AppTimeReq messages and request an immediate transmission of end-device time 0x02 DeviceAppTimePeriodicityAns x 0x03 ForceDeviceResyncReq x Used by the application server to the end-device to trigger a clock resynchronization. Table 1: Clock Synchronization messages summary 143 144 145 146 147 148

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