Last modified by Edwin Chen on 2025/01/29 20:30
<
From version < 30.1 >
edited by Xiaoling
on 2022/05/26 17:12
To version < 32.5 >
edited by Xiaoling
on 2022/07/13 15:02
>
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1 -**~ Contents:**
1 +**~ Table of Contents:**
2 2  
3 -(((
4 -
5 -)))
6 -
7 7  {{toc/}}
8 8  
9 9  
6 +
10 10  = 1. OTAA Join Process Debug =
11 11  
9 +
12 12  These pages are useful to check what is wrong on the Join process. Below shows the four steps that we can check the Join Process.
13 13  \\**If user has checked below steps and still can't solve the problem, please send us (support @ dragino.com) the sceenshots for each step to check. They include:**
14 14  
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64 64  
65 65  = 2. Notice of US915/CN470/AU915 Frequency band =
66 66  
65 +
67 67  (((
68 68  If user has problem to work with lorawan server in band US915/AU915/CN470, he can check:
69 69  )))
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106 106  
107 107  AU915 Channels
108 108  
108 +
109 109  [[image:image-20220526163941-8.png]]
110 110  
111 111  (((
112 112  CN470 Channels
113 +
114 +
113 113  )))
114 114  
115 115  (((
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120 120  
121 121  (((
122 122  TTN FREQUENCY PLAN
125 +
126 +
123 123  )))
124 124  
125 125  (((
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129 129  
130 130  = 3. Why i see data lost/unperiocially uplink data? Even the signal strength is good =
131 131  
136 +
132 132  In this case, we can check if the frequency band matches in End Node, Gateway and LoRaWAN server. A typical case is using US915 in ChirpStack server as below:
133 133  
134 134  * **End node** ~-~-> Use Sub-band2 (Channel 8,9,10,11,12,13,14,15) for Dragino Sensor. ADR is also enable, this is the default settings for dragino sensors.
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150 150  
151 151  = 4. Transmision on ABP Mode =
152 152  
158 +
153 153  (((
154 154  In ABP mode, there is a Frame Counter Checks. With this check enabled, the server will only accept the frame with a higher counter. If you reboot the device in ABP mode, the device will start from count 0, so you won't be able to see the frame update in server.
155 155  )))
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179 179  
180 180  == 5.1 How it work ==
181 181  
188 +
182 182  LoRaWAN End node will open two receive windows to receive the downstream data. If the downstream packets arrive the end node at these receive windows, the end node will be able to get this packet and process it.
183 183  
184 184  (((
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185 185  Depends on Class A or Class C, the receive windows will be a little difference,
186 186  )))
187 187  
188 -[[image:image-20220526164547-11.png]]
195 +[[image:image-20220531161828-1.png]]
189 189  
190 190  receive windows for Class A and Class C
191 191  
199 +
192 192  Below are the requirement for the End Device to receive the packets.
193 193  
194 194  * The End Device must open the receive windows: RX1 or RX2
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195 195  * The LoRaWAN server must send a downstream packet, and the gateway forward this downstream packet for this end node.
196 196  * This downstream packet must arrive to the end node while RX1 or RX2 is open.
197 197  * This packet must match the frequency of the RX1 or RX2 window.
198 -* This packet must match the DataRate of RX1(RX1DR) or RX2 (RX2DR). **This is the common fail point, because different lorawan server might use different RX2DR and they don't info End Node via ADR message so cause the mismatch. If this happen, user need to change the RX2DR to the right value in end node. In OTAA, LoRaWAN Server will send the RX2DR setting in Join Accept message so the end node will auto adjust. but ABP uplink doesn't support this auto change.**
206 +* This packet must match the DataRate of RX1(RX1DR) or RX2 (RX2DR). (% style="color:red" %)**This is the common fail point, because different lorawan server might use different RX2DR and they don't info End Node via ADR message so cause the mismatch. If this happen, user need to change the RX2DR to the right value in end node. In OTAA, LoRaWAN Server will send the RX2DR setting in Join Accept message so the end node will auto adjust. but ABP uplink doesn't support this auto change.**
199 199  
200 200  == 5.2 See Debug Info ==
201 201  
210 +
202 202  (((
203 -**For LoRaWAN Server**
212 +(% style="color:blue" %)**For LoRaWAN Server**
204 204  )))
205 205  
206 206  (((
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230 230  
231 231  
232 232  (((
233 -**For LoRaWAN Gateway**
242 +(% style="color:blue" %)**For LoRaWAN Gateway**
234 234  )))
235 235  
236 236  (((
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245 245  
246 246  
247 247  (((
248 -**For End Node**
257 +(% style="color:blue" %)**For End Node**
249 249  )))
250 250  
251 251  (((
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253 253  )))
254 254  
255 255  (((
265 +(% style="color:#037691" %)**AT+RX2FQ=869525000**  (%%) **~-~-->**  The RX2 Window frequency
266 +(% style="color:#037691" %)**AT+RX2DR=3**          (%%) **~-~-->**  The RX2 DataRate
267 +(% style="color:#037691" %)**AT+RX1DL=1000**       (%%) ** ~-~-->**  Receive Delay 1
268 +(% style="color:#037691" %)**AT+RX2DL=2000**       (%%) **~-~--> ** Receive Delay 2
269 +
256 256  
257 257  )))
258 258  
259 259  (((
260 -(% class="box infomessage" %)
261 -(((
262 -AT+RX2FQ=869525000     ~-~--> The RX2 Window frequency
263 -AT+RX2DR=3      ~-~--> The RX2 DataRate
264 -AT+RX1DL=1000   ~-~--> Receive Delay 1
265 -AT+RX2DL=2000   ~-~--> Receive Delay 2
274 +(% style="color:blue" %)**when the device running, we can see below info:**
266 266  )))
267 -)))
268 268  
269 -(((
270 -**when the device running, we can see below info:**
271 -)))
272 -
273 273  {{{ [12502]***** UpLinkCounter= 0 *****
274 274   [12503]TX on freq 868500000 Hz at DR 0
275 275   [13992]txDone
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283 283  )))
284 284  
285 285  (((
286 -**Another message:**
290 +(% style="color:blue" %)**Another message:**
287 287  )))
288 288  
289 289  {{{ [12502]***** UpLinkCounter= 0 *****
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339 339  (% class="box infomessage" %)
340 340  (((
341 341  **Change to ABP Mode: AT+NJM=0**
342 -)))
343 -
344 -(% class="box infomessage" %)
345 -(((
346 346  **Change to fix frequency: AT+CHS=904900000**
347 -)))
348 -
349 -(% class="box infomessage" %)
350 -(((
351 351  **Change to fix DR: AT+DR=0**
352 352  )))
353 353  
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436 436  * (((
437 437  Some node decoders may not have filtering function, or you need decoders of other servers and formats. Please send an email to [[david.huang@dragino.cc>>mailto:david.huang@dragino.cc]]
438 438  
439 -
440 440  
441 441  )))
442 442  
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496 496  
497 497  (((
498 498  (Any combination of 16 bit codes can be used）
494 +
495 +
496 += 12. I set my device is LoRaWAN Class C mode, why i still see Class A after boot? =
499 499  )))
500 500  
501 501  
500 +Class C only refers to status after OTAA Join successfully. The OTAA Join Process will use Class A mode.
501 +
502 +
503 +
502 502  (% class="wikigeneratedid" %)
503 503  
image-20220531161828-1.png
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1 +XWiki.Xiaoling
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