Version 26.1 by Mengting Qiu on 2023/11/24 14:26
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1 **Table of Contents:**
2
3 {{toc/}}
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10 = 1. introduction =
11
12 This chapter describes switch LoRaWAN server by rejoin feature.
13
14
15 = 2. What is the rejoin feature? =
16
17 rejoin feature is that if the ACK packet sent by the platform to the node is not received within the set time range, the offline detection will be started.
18
19 == 2.1offline rejoining （LWS007) ==
20
21
22 (% style="color:blue" %)**AT Command: AT+DDETECT**
23
24 AT+DDETECT=<Flag>,<ACK_Timout_1>,<ACK_Timout_2> (Default Value: AT+DDETECT=1,1440,2880)
25
26 * ACK_Timout_1: Unit: min
27
28 * ACK_Timout_2: Unit: min
29
30 (% border="1" style="background-color:#f2f2f2; width:562px" %)
31 |(% style="background-color:#4f81bd; color:white; width:160px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:272px" %)**Function**|(% style="background-color:#4f81bd; color:white; width:89px" %)**Response**
32 |(% style="width:160px" %)(((
33 AT+DDETECT=1,1440,2880
34
35 value1
36 )))|(% style="width:272px" %)Enable online detect|(% style="width:89px" %)(((
37 1
38
39 OK
40 )))
41 |(% style="width:160px" %)(((
42 AT+DDETECT=1,?,2880
43
44 value2
45 )))|(% style="width:272px" %)Online detection packet sending time|(% style="width:89px" %)(((
46
47
48 OK
49 )))
50 |(% style="width:160px" %)(((
51 AT+DDETECT=1,1440,？
52
53 value3
54 )))|(% style="width:272px" %)Process rejoin|(% style="width:89px" %)(((
55
56
57 OK
58 )))
59
60 (% style="color:blue" %)**Downlink Command: 0x32**
61
62 Format: Command Code (0x32) followed by 2 bytes mode value.
63
64 If the downlink payload=320105A00B40, it means set end node to use confirm mode, while type code is 32.
65
66 * **Example 1:** Downlink Payload: 320105A00B40  ~/~/ Set AT+DDETECT=1,1440,2880
67
68 *
69 ** 0x01** : Flag**
70
71 **0x05A0 **: ACK_Timout_1 : 1440minutes (24 hours)
72
73 **0x0B40 **: ACK_Timout_2 : 2880minutes (48 hours)
74
75 * **Explain**: Enable Online Detect, if end node doesn't receive any downlink within ACK_Timout_1( 1440 minutes or 24 hours). End node will use confirmed uplink to send packets during ACK_Timout_1 (the 24th hour) to ACK_Timout_2 ( the 48th hour). If from the 24th to 48th hour, end node got an downlink from server, it will switch back to unconfirmed uplink. end node will restart ACK_Timout_1. If from the 24th to 48th hour, end node still not got any downlink, means device doesn't get ACK from server within last 48 hours. Device will process rejoin, rejoin request interval is AT+RJTDC period. For AU915/ US915, device will use the sub-band used for last join.
76
77 == 2.2 Change Uplink Interval ==
78
79 Feature: Change LoRaWAN End Node Transmit Interval.
80
81
82 (% style="color:blue" %)**AT Command: AT+TDC**
83
84 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:727.222px" %)
85 |(% style="background-color:#4f81bd; color:white; width:165px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:227px" %)**Function**|(% style="background-color:#4f81bd; color:white; width:329px" %)**Response**
86 |(% style="width:165px" %)AT+TDC=?|(% style="width:227px" %)Show current transmit Interval|(% style="width:329px" %)30000(((
87 OK
88
89 the interval is 30000ms = 30s
90 )))
91 |(% style="width:165px" %)AT+TDC=60000|(% style="width:227px" %)Set Transmit Interval|(% style="width:329px" %)OK(((
92 Set transmit interval to 60000ms = 60 seconds
93 )))
94
95 (((
96 (% style="color:blue" %)**Downlink Command: 0x01**
97
98 Format: Command Code (0x01) followed by 3 bytes time value.
99 )))
100
101 (((
102 If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
103 )))
104
105 * **Example 1**: Downlink Payload:** 0100001E**  ~/~/ Set Transmit Interval (TDC) = 30 seconds
106
107 * **Example 2**: Downlink Payload:** 0100003C**  ~/~/ Set Transmit Interval (TDC) = 60 seconds
108
109 (% style="display:none" %) (%%)
110
111
112 = 3. Examples and Explanations =
113
114 (% style="color:blue" %)**Switching platforms by rejoin function: Use device LHT65N to switch from TTN to ChirpStack as an example.**
115
116 The following example shows the parameters of the LHT65N. Users need to check the Wiki instructions to confirm the parameters of the equipment they have purchased.
117 ([[User Manual for LoRaWAN End Nodes)>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes]])
118
119
120 == 3.1 Configure appropriate operation times ==
121
122 (% style="color:blue" %)**Firstly, the user sent downlink commands through the original registration platform (TTN) to modify the required TDC time and offline detection time.**(%%) 
123
124 (% style="color:red" %)**Note: Users need to set the TDC time shorter than the offline detection ACK_Timeout_1, the best offline detection time is more than twice the TDC time.**
125
126
127 * Configuration via TTN downlink：
128
129 [[image:image-20231123170814-4.png||height="631" width="696"]]
130
131 (% style="color:red" %)**Note: When configuring the device using downlink commands, you need to wait for the original TDC time, and the platform plans downlink after the end node complete uplink.**
132
133 TDC changed successfully:
134
135 [[image:image-20231124102601-1.png||height="543" width="617"]]
136
137
138 Confirm that the TDC configuration is successful, and then configure the offline detection time:
139
140
141 [[image:image-20231123170339-2.png||height="566" width="715"]]
142
143
144 * Configure using the AT commands by Serial Port Utility:
145
146 [[image:image-20231124103318-2.png||height="538" width="738"]]
147
148
149 == 3.2 Delete the device and add the device to the new platform ==
150
151
152 Delete device：
153
154 [[image:image-20231124104002-3.png||height="302" width="653"]]
155
156 [[image:image-20231124104014-4.png||height="210" width="654"]]
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158
159 Register the device on the new platform and wait for the offline detection time for the device to automatically request to join the network.
160
161 [[image:image-20231124112845-8.png||height="449" width="935"]]
162
163 [[image:image-20231124113011-9.png||height="450" width="935"]]
164
165 [[image:image-20231124111630-6.png||height="537" width="813"]]
166
167
168
169 == 3.3 Restore the default TDC time and the default offline detection time ==
170
171 * (% style="color:blue" %)**It is recommended to restore the factory reset directly:**
172
173 (% style="color:red" %)** downlink payload: 0x04FE**
174
175 [[image:image-20231124114451-10.png||height="377" width="826"]]
176
177 [[image:image-20231124115256-11.png||height="409" width="767"]]
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180 * (% style="color:blue" %)**If the device has other configurations to keep, users can also choose to configure the default TDC and default offline detection time separately.**
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