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TR007 Developing LoRaWAN® Devices © 2021 LoRa Alliance® Page 4 of 26 The authors reserve the right to change specifications without notice. 3.5.2 Recommended Practice ................................................................................... 15 97 3.6 DevNonce Values SHALL Not Be Reused ............................................................. 15 98 3.6.1 Description ....................................................................................................... 15 99 3.6.2 Recommended Practice ................................................................................... 16 100 3.7 Avoiding Synchronous Behavior ............................................................................. 16 101 3.7.1 Description ....................................................................................................... 16 102 3.7.2 Recommended Practice ................................................................................... 16 103 3.8 Avoiding Congestion Collapse................................................................................ 16 104 3.8.1 Description ....................................................................................................... 16 105 3.8.2 Recommended Practice ................................................................................... 17 106 3.9 Discontinuing Retransmissions .............................................................................. 18 107 3.9.1 Description ....................................................................................................... 18 108 3.9.2 Recommended Practice ................................................................................... 18 109 3.10 Default Channels.................................................................................................... 19 110 3.10.1 Description ....................................................................................................... 19 111 3.10.2 Recommended Practice ................................................................................... 19 112 3.11 FcntUp/FcntDown SHALL Use 32 Bits ................................................................... 19 113 3.11.1 Description ....................................................................................................... 19 114 3.11.2 Recommended practice .................................................................................... 19 115 3.12 Frame Counters Incremented only with Frame Transmission ................................. 20 116 3.12.1 Description ....................................................................................................... 20 117 3.12.2 Recommended Practice ................................................................................... 20 118 3.13 OTAA Required Persistent Values ......................................................................... 20 119 3.13.1 Description ....................................................................................................... 20 120 3.13.2 Recommended Practice ................................................................................... 20 121 3.14 ABP Required Persistent Values ............................................................................ 21 122 3.14.1 Description ....................................................................................................... 21 123 3.14.2 Recommended Practice ................................................................................... 21 124 3.15 ADR (Adaptive Data Rate) Support ........................................................................ 21 125 3.15.1 Description ....................................................................................................... 21 126 3.15.2 Recommended Practice ................................................................................... 22 127 3.16 ADR Back Off ......................................................................................................... 22 128 3.16.1 Description ....................................................................................................... 22 129

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