Last modified by Edwin Chen on 2025/01/29 20:30
<
From version < 37.2 >
edited by Xiaoling
on 2022/12/16 10:46
To version < 45.1 >
edited by Mengting Qiu
on 2024/01/23 16:17
>
Change comment: Uploaded new attachment "image-20240123161737-4.png", version {1}

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1 -XWiki.Xiaoling
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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 19  (% style="color:blue" %)**1. End Device Join Screen shot, we can check:**
20 20  
21 21  * If the device is sending join request to server?
26 +
22 22  * What frequency the device is sending?
23 23  
24 24  [[image:image-20220526164956-15.png||height="591" width="1153"]]
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30 30  (% style="color:blue" %)**2. Gateway packet traffic in gateway web or ssh. we can check:**
31 31  
32 32  * 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 +
33 33  * If the gateway gets the Join Accept message from server and transmit it via LoRa?
34 34  
35 35  [[image:image-20220526163608-2.png]]
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41 41  (% style="color:blue" %)**3. Gateway Traffic Page in LoRaWAN Server**
42 42  
43 43  * If the Join Request packet arrive the gateway traffic in server? If not, check the internet connection and gateway LoRaWAN server settings.
50 +
44 44  * 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 +
45 45  * 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.
46 46  
47 47  [[image:image-20220526163633-3.png]]
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206 206  
207 207  * 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.**
208 208  
209 -
210 -
211 211  == 5.2 See Debug Info ==
212 212  
213 213  
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267 267  )))
268 268  
269 269  (((
270 -(% style="color:#037691" %)**AT+RX2FQ=869525000**  (%%) **~-~-->**  The RX2 Window frequency
271 -(% style="color:#037691" %)**AT+RX2DR=3**          (%%) **~-~-->**  The RX2 DataRate
272 -(% style="color:#037691" %)**AT+RX1DL=1000**       (%%) ** ~-~-->**  Receive Delay 1
273 -(% style="color:#037691" %)**AT+RX2DL=2000**       (%%) **~-~--> ** Receive Delay 2
276 +* (% style="color:#037691" %)**AT+RX2FQ=869525000**  (%%) **~-~-->**  The RX2 Window frequency
274 274  
278 +* (% style="color:#037691" %)**AT+RX2DR=3**          (%%) **~-~-->**  The RX2 DataRate
275 275  
276 -
280 +* (% style="color:#037691" %)**AT+RX1DL=1000**       (%%) ** ~-~-->**  Receive Delay 1
281 +
282 +* (% style="color:#037691" %)**AT+RX2DL=2000**       (%%) **~-~--> ** Receive Delay 2
277 277  )))
278 278  
279 279  (((
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316 316  (% 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:**
317 317  
318 318  * End node console to show the transmit freuqency and DR.
325 +
319 319  * Gateway (from gateway UI) traffic to show the packet got from end node and receive from Server.
327 +
320 320  * Gateway traffic (from server UI) to shows the data exchange between gateway and server.
329 +
321 321  * End Node traffic (from server UI) to shows end node activity in server.
322 322  
323 -
324 -
325 325  = 6. Downlink Issue ~-~- Packet REJECTED, unsupported frequency =
326 326  
327 327  
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354 354  (% style="color:blue" %)**1. LHT65 End device configure:**
355 355  
356 356  **Change to ABP Mode:  AT+NJM=0**
364 +
357 357  **Change to fix frequency:  AT+CHS=904900000**
366 +
358 358  **Change to fix DR:  AT+DR=0**
359 359  
360 360  
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426 426  
427 427  * (((
428 428  If a node is registered with multiple servers, it may also cause the "mic mismatch" error.
438 +)))
429 429  
440 +(% class="wikigeneratedid" %)
441 +3）Wrong Regional Parameters version selected
442 + We generally use versions above 1.0.2
430 430  
431 -
432 -)))
444 +(% class="wikigeneratedid" %)
445 +[[image:image-20230322163227-1.png]]
433 433  
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
449 +
450 +
434 434  = 10. Why i got the payload only with "0x00" or "AA~=~="? =
435 435  
436 436  
437 -**Why this happen:**
454 +(% style="color:blue" %)**Why sensor sends 0x00?**
438 438  
439 -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.
440 440  
441 -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**:
442 442  
443 -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.
444 444  
445 445  
446 -**How to solve:**
463 +**Possible Case 2:**
447 447  
448 -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.
449 449  
467 +
468 +(% style="color:blue" %)**How to solve:**
469 +
470 +Solution:
471 +
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 +
450 450  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]]
451 451  
452 452  
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