Last modified by Edwin Chen on 2025/01/29 20:30
<
From version < 37.1 >
edited by Edwin Chen
on 2022/12/15 22:33
To version < 42.1 >
edited by Mengting Qiu
on 2024/01/23 15:07
>
Change comment: Uploaded new attachment "image-20240123150720-1.png", version {1}

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Author
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1 -XWiki.Edwin
1 +XWiki.ting
Content
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4 4  
5 5  
6 6  
7 -= 1. OTAA Join Process Debug =
7 += 1.(% style="display:none" %) (%%) OTAA Join Process Debug =
8 8  
9 9  
10 10  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.
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11 11  \\**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:**
12 12  
13 13  * End node console to show the Join freuqency and DR. (If possible)
14 +
14 14  * Gateway (from gateway UI) traffic to show the packet got from end node and receive from Server. (If possible)
16 +
15 15  * Gateway traffic (from server UI) to shows the data exchange between gateway and server. (Normaly possible)
18 +
16 16  * End Node traffic (from server UI) to shows end node activity in server. (Normaly possible)
20 +
17 17  * End Node Keys screen shot shows in end node and server. so we can check if the keys are correct. (In most case, we found keys doesn't match, especially APP EUI)
18 18  
19 -
20 20  (% style="color:blue" %)**1. End Device Join Screen shot, we can check:**
21 21  
22 22  * If the device is sending join request to server?
26 +
23 23  * What frequency the device is sending?
24 24  
25 -[[image:image-20220526164956-15.png]]
29 +[[image:image-20220526164956-15.png||height="591" width="1153"]]
26 26  
27 27  Console Output from End device to see the transmit frequency
28 28  
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31 31  (% style="color:blue" %)**2. Gateway packet traffic in gateway web or ssh. we can check:**
32 32  
33 33  * If the gateway receive the Join request packet from sensor? (If this fail, check if the gateway and sensor works on the match frequency)
38 +
34 34  * If the gateway gets the Join Accept message from server and transmit it via LoRa?
35 35  
36 36  [[image:image-20220526163608-2.png]]
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42 42  (% style="color:blue" %)**3. Gateway Traffic Page in LoRaWAN Server**
43 43  
44 44  * If the Join Request packet arrive the gateway traffic in server? If not, check the internet connection and gateway LoRaWAN server settings.
50 +
45 45  * If the server send back a Join Accept for the Join Request? if not, check if the keys from the device match the keys you put in the server, or try to choose a different server route for this end device.
52 +
46 46  * If the Join Accept message are in correct frequency? If you set the server to use US915 band, and your end node and gateway is EU868, you will see the Join Accept message are in US915 band so no possible to Join success.
47 47  
48 48  [[image:image-20220526163633-3.png]]
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65 65  Check if OTAA Keys match the keys in device
66 66  
67 67  
68 -
69 69  = 2. Notice of US915/CN470/AU915 Frequency band =
70 70  
71 71  
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130 130  (((
131 131  TTN FREQUENCY PLAN
132 132  
133 -
139 +(% style="display:none" %) (%%)
134 134  )))
135 135  
136 136  (((
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137 137  In dragino end node, user can use AT+CHE command to set what frequencies set the end node will use. The default settings for Dragino end node are preconfigure for TTN server, so use 8~~15 channels, which is **AT+CHE=2**. (AT+CHE=1 for first 8 channels, AT+CHE=2 for second 8 channels.. etc, and AT+CHE=0 for all 72 channels. )
138 138  )))
139 139  
146 +(% style="display:none" %) (%%)
140 140  
141 -
142 142  = 3. Why i see data lost/unperiocially uplink data? Even the signal strength is good =
143 143  
144 144  
145 145  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:
146 146  
147 -* **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.
148 -* **Gateway** ~-~-> Use Sub-band2 (Channel 8,9,10,11,12,13,14,15) for Dragino Gateway. this is the default settings for dragino sensors.
149 -* **LoRaWAN server** ~-~-> ChirpStack default installation and use Sub-band1, **enabled_uplink_channels=[0, 1, 2, 3, 4, 5, 6, 7]** in the file chirpstack-network-server.toml.
153 +* (% style="color:blue" %)**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.
150 150  
155 +* (% style="color:blue" %)**Gateway** (%%) ~-~-> Use Sub-band2 (Channel 8,9,10,11,12,13,14,15) for Dragino Gateway. this is the default settings for dragino sensors.
156 +
157 +* (% style="color:blue" %)**LoRaWAN server**  (%%) ~-~-> ChirpStack default installation and use Sub-band1, **enabled_uplink_channels=[0, 1, 2, 3, 4, 5, 6, 7]** in the file chirpstack-network-server.toml.
158 +
151 151  (((
152 152  When Sensor power on, it will use sub-band2 to join the network, the frequency matches the settings in gateway so all Join Request will be passed to the server for Join. Server will ask the sensor to change to Sub-band1 in the Join Accept downlink message. Sensor will change to sub-band1 for data upload. This cause the sensor and gateway have different frequencies so user see lost of most data or even no data.
153 153  )))
154 154  
155 -(((
156 -
157 -)))
158 158  
159 159  (((
160 160  Use Subband2 as a default subband cause the sensor to have problem to work with the LoRaWAN server which use other subband, and use need to access to the end node to change the subband by console. that is not user frendily,. So since Dragino LoRaWAN Stack version DLS-005(release on end of 2020), we have changed the device to use All Subbands for OTAA join, for example, device will use the first frequency in Sub-Band1 as firt OTAA join packet, then use the first frequency in Sub-Band 2 , then first frequency in sub-band 3, and so on. LoRaWAN server will normally provide the required subband in the OTAA accept process, so end node will know what subband it use after join. If LoRaWAN server doesn't provide subband info in OTAA join, end node will use the subband which join success as the working subband. So the new method cause a longer OTAA Join time but will be compatible with all LoRaWAN server. And new method won't affect the normal uplink after Join Success.
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161 161  )))
162 162  
163 163  
164 -
165 165  = 4. Transmision on ABP Mode =
166 166  
167 167  
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170 170  )))
171 171  
172 172  (((
173 -
174 -)))
175 -
176 -(((
177 177  So in ABP mode, first check if the packet already arrive your gateway, if the packet arrive gatewat but didn't arrive server. Please check if this is the issue.
178 178  )))
179 179  
180 180  (((
181 -
182 -)))
183 -
184 -(((
185 185  To solve this, disable the Frame Counter Check will solve this issue , or reset the frame counter in the device page.
186 186  )))
187 187  
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190 190  Disable Frame Counter Check in ABP Mode
191 191  
192 192  
193 -
194 194  = 5. Downstream Debug =
195 195  
196 196  == 5.1 How it work ==
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210 210  Below are the requirement for the End Device to receive the packets.
211 211  
212 212  * The End Device must open the receive windows: RX1 or RX2
208 +
213 213  * The LoRaWAN server must send a downstream packet, and the gateway forward this downstream packet for this end node.
210 +
214 214  * This downstream packet must arrive to the end node while RX1 or RX2 is open.
212 +
215 215  * This packet must match the frequency of the RX1 or RX2 window.
214 +
216 216  * 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.**
217 217  
218 -
219 219  == 5.2 See Debug Info ==
220 220  
221 221  
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275 275  )))
276 276  
277 277  (((
278 -(% style="color:#037691" %)**AT+RX2FQ=869525000**  (%%) **~-~-->**  The RX2 Window frequency
279 -(% style="color:#037691" %)**AT+RX2DR=3**          (%%) **~-~-->**  The RX2 DataRate
280 -(% style="color:#037691" %)**AT+RX1DL=1000**       (%%) ** ~-~-->**  Receive Delay 1
281 -(% style="color:#037691" %)**AT+RX2DL=2000**       (%%) **~-~--> ** Receive Delay 2
276 +* (% style="color:#037691" %)**AT+RX2FQ=869525000**  (%%) **~-~-->**  The RX2 Window frequency
282 282  
278 +* (% style="color:#037691" %)**AT+RX2DR=3**          (%%) **~-~-->**  The RX2 DataRate
283 283  
284 -
280 +* (% style="color:#037691" %)**AT+RX1DL=1000**       (%%) ** ~-~-->**  Receive Delay 1
281 +
282 +* (% style="color:#037691" %)**AT+RX2DL=2000**       (%%) **~-~--> ** Receive Delay 2
285 285  )))
286 286  
287 287  (((
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318 318   1:0012345678}}}
319 319  
320 320  
321 -
322 322  == 5.3 If problem doesn't solve ==
323 323  
324 324  
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325 325  (% style="color:red" %)**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:**
326 326  
327 327  * End node console to show the transmit freuqency and DR.
325 +
328 328  * Gateway (from gateway UI) traffic to show the packet got from end node and receive from Server.
327 +
329 329  * Gateway traffic (from server UI) to shows the data exchange between gateway and server.
329 +
330 330  * End Node traffic (from server UI) to shows end node activity in server.
331 331  
332 -
333 333  = 6. Downlink Issue ~-~- Packet REJECTED, unsupported frequency =
334 334  
335 335  
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356 356  )))
357 357  
358 358  
359 -
360 360  = 7. Decrypt a LoRaWAN Packet =
361 361  
362 362  
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363 363  (% style="color:blue" %)**1. LHT65 End device configure:**
364 364  
365 365  **Change to ABP Mode:  AT+NJM=0**
364 +
366 366  **Change to fix frequency:  AT+CHS=904900000**
366 +
367 367  **Change to fix DR:  AT+DR=0**
368 368  
369 369  
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404 404  )))
405 405  
406 406  
407 -
408 408  = 8. Why i see uplink 0x00 periodcally on the LHT65 v1.8 firmware =
409 409  
410 410  
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411 411  Since firmware v1.8, LHT65 will send MAC command to request time, in the case if DR only support max 11 bytes, this MAC command will be bundled to a separate uplink payload with 0x00.
412 412  
413 413  
414 -
415 415  = 9. Why do I see a "MIC Mismatch" error message from the server? =
416 416  
417 417  
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437 437  
438 438  * (((
439 439  If a node is registered with multiple servers, it may also cause the "mic mismatch" error.
438 +)))
440 440  
440 +(% class="wikigeneratedid" %)
441 +3）Wrong Regional Parameters version selected
442 + We generally use versions above 1.0.2
441 441  
444 +(% class="wikigeneratedid" %)
445 +[[image:image-20230322163227-1.png]]
442 442  
443 -
444 -)))
447 +(% class="wikigeneratedid" %)
448 +4）We have had cases where it was automatically fixed the next day despite no manual changes, probably a server side issue
445 445  
450 +
446 446  = 10. Why i got the payload only with "0x00" or "AA~=~="? =
447 447  
448 448  
449 -**Why this happen:**
454 +(% style="color:blue" %)**Why sensor sends 0x00?**
450 450  
451 -For US915, AU915 or AS923 frequencies.It is possible because: .
456 +For US915, AU915 or AS923 frequencies, the max payload lenght is 11 bytes for DR0. Some times sensor needs to send MAC command to server, because the payload is 11 bytes, The MAC command + Payload will exceed 11 bytes and LoRaWAN server will ignore the uplink. In this case, Sensor will send two uplinks together: one uplink is the payload without MAC command, another uplink is **0x00 payload + MAC Command.**  For the second uplink, in the server side, it will shows the payload is 0x00. Normally, there are several case this will happen.
452 452  
453 -When using the frequency mentioned above, the server sometimes adjusts the Data Rate (DR) of the node, because the end node has Adaptive Data Rate (ADR) Enabled.
458 +**Possible Case 1**:
454 454  
455 -When the server adjusts end node data rate to 0, the maximum payload length is 11 bytes. The server sometimes sends an ADR packet to the end node, and the node will reply to the server after receiving the ADR packet, but the number of payload bytes exceeds the limit, so it will send a normal uplink packet, and following an additional 00 data packet to handle this MAC command response.
460 +Sensor has ADR=1 enable and sensor need to reply server MAC command (ADR request) while sensor has DR=0.
456 456  
457 457  
458 -**How to solve:**
463 +**Possible Case 2:**
459 459  
460 -Solution: Use the decoder to filter out this 0x00 packet.
465 +For the sensor which has Datalog Feature enable, the sensor will send TimeRequest MAC Command to sync the time. This Time Request will be sent once Sensor Join Network and Every 10 days. While they send such command with DR=0, sensor will send this command with 0x00 payload.
461 461  
462 -Some node decoders may not have the filter function, or you need decoders of other servers and formats. Please send an email to [[support@dragino.com>>mailto:support@dragino.com]]
463 463  
468 +(% style="color:blue" %)**How to solve:**
464 464  
470 +Solution:
465 465  
472 +~1. Use the decoder to filter out this 0x00 packet. (**Recommand**)
473 +
474 +2. Data rate changed from DR3 to DR5, increasing upload byte length
475 +AT+ADR=0
476 +AT+DR=3
477 +
478 +Downlink：
479 +
480 +[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H7.4DataRate>>http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H7.4DataRate]]
481 +
482 +Some node decoders may not have the filter function, or you need decoders of other servers and formats. Please send an email to [[support@dragino.com>>mailto:support@dragino.com]]
483 +
484 +
466 466  = 11. Why my Dev EUI and APP EUI is 0x000000000000, how to solve? =
467 467  
468 468  
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524 524  (Any combination of 16 bit codes can be used）
525 525  
526 526  
527 -
528 528  = 12. I set my device is LoRaWAN Class C mode, why i still see Class A after boot? =
529 529  )))
530 530  
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