Wiki source code of LoRaWAN Communication Debug

Version 100.1 by Bei Jinggeng on 2025/04/29 13:36

version	line-number	content
32.2	1	~ Table of Contents:
1.1	2
	3	{{toc/}}
	4
	5
30.2	6
52.2	7	= 1. Join process page check =
1.1	8
52.2	9
1.1	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.
2.1	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:
1.1	12
	13	* End node console to show the Join freuqency and DR. (If possible)
37.3	14
1.1	15	* Gateway (from gateway UI) traffic to show the packet got from end node and receive from Server. (If possible)
37.3	16
1.1	17	* Gateway traffic (from server UI) to shows the data exchange between gateway and server. (Normaly possible)
37.3	18
1.1	19	* End Node traffic (from server UI) to shows end node activity in server. (Normaly possible)
37.3	20
1.1	21	* 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)
	22
32.14	23	(% style="color:blue" %)1. End Device Join Screen shot, we can check:
	24
1.1	25	* If the device is sending join request to server?
37.3	26
1.1	27	* What frequency the device is sending?
	28
61.1	29	[[image:image-20240129142147-2.png\|\|height="736" width="964"]]
1.1	30
52.1	31	Console Output from End device to see the transmit frequency.
1.1	32
32.16	33
32.14	34	(% style="color:blue" %)2. Gateway packet traffic in gateway web or ssh. we can check:
1.1	35
	36	* If the gateway receive the Join request packet from sensor? (If this fail, check if the gateway and sensor works on the match frequency)
37.3	37
1.1	38	* If the gateway gets the Join Accept message from server and transmit it via LoRa?
	39
61.1	40	[[image:image-20240129151608-6.jpeg\|\|height="725" width="1256"]]
1.1	41
	42	Console Output from Gateway to see packets between end node and server.
	43
	44
49.1	45	(% style="color:blue" %)3. Gateway Live data in LoRaWAN Server
1.1	46
49.1	47	* Does the gateway real-time data contain information about Join Request? If not, check the internet connection and gateway LoRaWAN server Settings.
37.3	48
49.1	49	* Does the server send back a Join Accept for the Join Request? If not, check that the key from the device matches the key you put into the server, or try to choose a different server route for that end device.
37.3	50
1.1	51	* 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.
	52
61.1	53	[[image:image-20240129150821-5.jpeg\|\|height="522" width="1264"]]
1.1	54
49.1	55	The Traffic for the End node in the server, use TTN as example.
1.1	56
	57
32.14	58	(% style="color:blue" %)4. Data Page in LoRaWAN server
1.1	59
	60	* If this data page shows the Join Request message from the end node? If not, most properly you have wrong settings in the keys. Keys in the server doesn't match the keys in End Node.
	61
61.1	62	[[image:image-20240129142557-3.png\|\|height="488" width="1267"]]
1.1	63
	64	The data for the end device set in server
	65
35.2	66
61.1	67	[[image:image-20240129142631-4.png\|\|height="637" width="1256"]]
1.1	68
49.1	69	Check if OTAA Keys match the keys in device.
1.1	70
	71
2.1	72	= 2. Notice of US915/CN470/AU915 Frequency band =
1.1	73
32.3	74
4.2	75	(((
50.1	76	If user has problem to work with LoRaWAN server in band US915/AU915/CN470, he can check:
4.2	77	)))
1.1	78
4.2	79	* (((
50.1	80	What sub-band the server support?
4.2	81	)))
	82	* (((
50.1	83	What is the sub-band the gateway support?
4.2	84	)))
	85	* (((
50.1	86	What is the sub-band the end node is using?
4.2	87	)))
1.1	88
4.2	89	(((
1.1	90	All of above should match so End Node can properly Join the server and don't have packet lost.
4.2	91	)))
1.1	92
4.2	93	(((
	94
	95	)))
	96
	97	(((
50.1	98	In LoRaWAN protocol, the frequency bands US915, AU915, CN470 each includes at least 72 frequencies. Many gateways support only 8 or 16 frequencies, and server might support 8 frequency only. In this case, the OTAA join time and uplink schedule is long and unpredictable while the end node is hopping in 72 frequencies, because the end node will send data in many frequency that the gateway or server doesn't support.
4.2	99	)))
1.1	100
4.2	101	(((
	102
	103	)))
	104
	105	(((
50.1	106	Here are the frequency tables for these bands as reference:
4.2	107	)))
1.1	108
14.2	109	[[image:image-20220526163801-6.png]]
1.1	110
	111	US915 Channels
	112
35.2	113
18.2	114	[[image:image-20220526163926-7.png]]
1.1	115
	116	AU915 Channels
	117
32.3	118
18.2	119	[[image:image-20220526163941-8.png]]
1.1	120
4.4	121	(((
1.1	122	CN470 Channels
32.3	123
	124
4.4	125	)))
1.1	126
4.3	127	(((
1.1	128	If we look at the [[TTN network server frequency plan>>url:https://www.thethingsnetwork.org/docs/lorawan/frequency-plans.html]], we can see the US915 frequency band use the channel 8~~15.So the End Node must work at the same frequency in US915 8~~15 channels for TTN server.
4.3	129	)))
1.1	130
49.1	131	[[image:image-20240123151225-3.png\|\|height="434" width="902"]]
1.1	132
4.4	133	(((
1.1	134	TTN FREQUENCY PLAN
32.3	135
37.2	136	(% style="display:none" %) (%%)
4.4	137	)))
1.1	138
4.3	139	(((
1.1	140	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. )
4.3	141	)))
1.1	142
37.2	143	(% style="display:none" %) (%%)
1.1	144
49.1	145	= 3. Why I see data lost/ is not periodically uplink？ Even the signal strength is good =
1.1	146
32.3	147
1.1	148	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:
	149
37.2	150	* (% 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.
1.1	151
37.2	152	* (% 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.
	153
	154	* (% 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.
	155
4.3	156	(((
1.1	157	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.
4.3	158	)))
1.1	159
4.3	160
	161	(((
1.1	162	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.
4.3	163	)))
1.1	164
	165
99.1	166	= 4. Why i see packet lost =
1.1	167
99.1	168	== 1. Signal problem ==
32.3	169
99.1	170
	171	1) (% style="color:blue" %)ADR automatic adjustment (%%)
	172
	173	Reason:
	174
	175	When the signal is at a critical value, the server may configure the node to adjust to a lower power DR.
	176	At this time, the server is at risk of losing uplink.
	177
	178
	179	Solution:
	180
	181	Users can manually fix the DR value.
	182
	183
	184	(% style="color:red" %)
	185	Notice:
	186
	187	* User need to set Adaptive Data Rate(ADR)=0 first. otherwise device will respond to server's ADR command and change the DR according to server auto-adjustment.
	188
	189	* Data Rate specifies Spreading Factor. The mapping varies in different frequency bands. User can check this link for detail. [[rp2-1.0.3-lorawan-regional-parameters.pdf>>https://lora-alliance.org/resource_hub/rp2-1-0-3-lorawan-regional-parameters/]]
	190
	191	(% style="color:blue" %)AT Command: AT+DR
	192
	193	(% border="1" cellspacing="4" style="background-color:#f2f2f2; width:409px" %)
	194	\|(% style="background-color:#4f81bd; color:white; width:156px" %)Command Example\|(% style="background-color:#4f81bd; color:white; width:147px" %)Function\|(% style="background-color:#4f81bd; color:white; width:100px" %)Response
	195	\|(% style="width:156px" %)AT+DR=?\|(% style="width:147px" %)Get the Data Rate.\|(% style="width:100px" %)5(((
	196	OK
	197	)))
	198	\|(% style="width:156px" %)AT+DR=2\|(% style="width:147px" %)Set the Data Rate.\|(% style="width:100px" %)OK(((
	199
	200	)))
	201
	202	(% style="color:blue" %)Downlink Command: 0x2200aaFF
	203
	204	If the downlink payload=220001FF, it means setting the data rate to 1, while type code is 22 00 aa FF.
	205
	206	* Example 1: Downlink Payload: 220001FF ~/~/ Set AT+DR=1.
	207
	208	* Example 2: Downlink Payload: 220000FF ~/~/ Set AT+DR=0.
	209
	210	(% style="display:none" %) (%%)
	211
	212
	213	2) (% style="color:blue" %)Node antenna problem
	214
	215	Reason:
	216
	217	Node antenna is loose
	218
	219
	220	Solution:
	221
	222	Please check whether the antenna interface and module interface are detached
	223
	224	[[image:image-20250429114526-1.png\|\|height="429" width="303"]]
	225
	226
	227
	228	3) (% style="color:blue" %)Gateway antenna problem
	229
	230	Reason:
	231	Gateway uses antenna with wrong frequency band
	232
	233	For example: 868-band gateway uses antenna with 915-band, which will cause the signal to be greatly reduced
	234
	235
	236	Solution:
	237
	238	Please check whether the silk screen on the antenna conflicts with the frequency you set.
	239
	240	[[image:image-20250429115124-2.png]][[image:image-20250429115159-3.png\|\|height="550" width="224"]]
	241
	242
	243	4) (% style="color:blue" %)Gateway module problem
	244
	245	Reason:
	246
	247	Gateway uses module with wrong frequency band
	248	For example: 868-band gateway uses module with 915-band, which will cause the signal to be greatly reduced
	249
	250
	251	Solution:
	252
	253	Please check whether the silkscreen of the module conflicts with the frequency you set.
	254
	255	[[image:image-20250429115951-5.png\|\|height="288" width="384"]][[image:image-20250429120030-6.png\|\|height="284" width="378"]]
	256
	257
	258	== 2. Frequency point problem ==
	259
	260	The frequency point of the gateway or server is wrong or missing.
	261
	262
	263	== 3. Frequency band problem ==
	264
	265	When there are multiple gateways, the node cannot lock the frequency band.
	266
	267
	268
	269	= 5. Transmision on ABP Mode =
	270
	271
4.3	272	(((
1.1	273	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.
4.3	274	)))
1.1	275
4.3	276	(((
1.1	277	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.
4.3	278	)))
1.1	279
4.3	280	(((
1.1	281	To solve this, disable the Frame Counter Check will solve this issue , or reset the frame counter in the device page.
49.1	282
	283	[[image:image-20240123161737-4.png\|\|height="395" width="763"]]
4.3	284	)))
1.1	285
49.1	286	[[image:image-20240123161853-6.png\|\|height="599" width="771"]]
1.1	287
	288	Disable Frame Counter Check in ABP Mode
	289
	290
99.1	291	= 6. Downstream Debug =
1.1	292
99.1	293	== 6.1 How it work ==
1.1	294
32.3	295
1.1	296	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.
	297
4.3	298	(((
92.1	299	Depends on Class A or Class C, the receive windows will be a little difference. The main difference between Class A and Class C:
	300
	301	* Class A : Suitable for Battery powered end node. Class A will save a lot of power but it can only receive downlink after each uplink
	302	* Class C: End node can receive downlink immediately but have higher power consumption.
	303
	304
4.3	305	)))
1.1	306
31.2	307	[[image:image-20220531161828-1.png]]
1.1	308
	309	receive windows for Class A and Class C
	310
32.3	311
1.1	312	Below are the requirement for the End Device to receive the packets.
	313
	314	* The End Device must open the receive windows: RX1 or RX2
37.2	315
1.1	316	* The LoRaWAN server must send a downstream packet, and the gateway forward this downstream packet for this end node.
37.2	317
1.1	318	* This downstream packet must arrive to the end node while RX1 or RX2 is open.
37.2	319
1.1	320	* This packet must match the frequency of the RX1 or RX2 window.
37.2	321
32.3	322	* 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.
1.1	323
99.1	324	== 6.2 See Debug Info ==
1.1	325
32.3	326
4.6	327	(((
32.3	328	(% style="color:blue" %)For LoRaWAN Server
4.6	329	)))
1.1	330
4.6	331	(((
1.1	332	We can check if there is downlink message for this end node, use TTN for example:
4.6	333	)))
1.1	334
4.6	335	(((
49.1	336	Configure a downlink to the end device
61.1	337
	338	[[image:image-20240129152412-8.png\|\|height="486" width="1206"]]
4.6	339	)))
1.1	340
	341
4.6	342	(((
1.1	343	Set a downstream in TTN and see it is sent
4.6	344	)))
1.1	345
63.1	346	(% style="color:red" %)Note: After the downlink command is successfully sent from the platform to the node, the downlink command is executed only after the platform receives the next uplink package from the node.
1.1	347
63.1	348
4.3	349	(((
63.1	350	This downlink info will then pass to the gateway downlink list. and the DR which is used (SF7BW500) in US915 is DR5.
4.3	351	)))
1.1	352
61.1	353	[[image:image-20240129152049-7.png\|\|height="463" width="1166"]]
1.1	354
4.6	355	(((
63.1	356	Gateway Traffic can see this downlink info
4.6	357	)))
1.1	358
	359
32.16	360
4.6	361	(((
32.3	362	(% style="color:blue" %)For LoRaWAN Gateway
4.6	363	)))
1.1	364
4.3	365	(((
63.1	366	When the downlink packet appear on the traffic of Gateway page. The LoRaWAN gateway can get it from LoRaWAN server and transmit it. In Dragino Gateway, this can be checked by running "logread -f" in the SSH console. and see below:
4.3	367	)))
1.1	368
63.1	369	[[image:image-20240129154321-9.png]]
1.1	370
4.6	371	(((
1.1	372	Gateway Sent out this packet
4.6	373	)))
1.1	374
	375
32.16	376
4.6	377	(((
32.3	378	(% style="color:blue" %)For End Node
4.6	379	)))
1.1	380
4.8	381	(((
1.1	382	we can use AT Command (AT+CFG) to check the RX1 configure and RX2 configure. as below:
4.8	383	)))
1.1	384
4.9	385	(((
37.3	386	* (% style="color:#037691" %)AT+RX2FQ=869525000 (%%) ~-~--> The RX2 Window frequency
32.4	387
37.3	388	* (% style="color:#037691" %)AT+RX2DR=3 (%%) ~-~--> The RX2 DataRate
32.16	389
37.3	390	* (% style="color:#037691" %)AT+RX1DL=1000 (%%) ~-~--> Receive Delay 1
	391
	392	* (% style="color:#037691" %)AT+RX2DL=2000 (%%) ~-~--> Receive Delay 2
4.9	393	)))
	394
	395	(((
32.3	396	(% style="color:blue" %)when the device running, we can see below info:
4.7	397	)))
1.1	398
4.8	399	{{{ [12502]*** UpLinkCounter= 0 ***
	400	[12503]TX on freq 868500000 Hz at DR 0
	401	[13992]txDone
4.13	402	[15022]RX on freq 868500000 Hz at DR 0 --> RX1 window open at frequency: 868500000, DR0, after 15022-13992= 1030ms of txdone
	403	[15222]rxTimeOut --> no packet arrive in RX1 window. (duration: 200ms)
	404	[15987]RX on freq 869525000 Hz at DR 3 --> RX2 window open at frequency: 869525000, DR3, after 15987-13992= 1995ms of txdone
	405	[16027]rxTimeOut --> no packet arrive in RX2 window. (duration: 40 ms)}}}
1.1	406
4.3	407	(((
4.5	408
32.16	409
	410
4.5	411	)))
	412
4.7	413	(((
32.3	414	(% style="color:blue" %)Another message:
4.7	415	)))
4.5	416
4.8	417	{{{ [12502]*** UpLinkCounter= 0 ***
	418	[12503]TX on freq 868100000 Hz at DR 0
	419	[13992]txDone
	420	[15022]RX on freq 868100000 Hz at DR 0
	421	[15222]rxTimeOut
	422	[15987]RX on freq 869525000 Hz at DR 3
4.13	423	[16185]rxDone --> We have got the downstream packet.
4.8	424	Rssi= -64
	425	Receive data
	426	1:0012345678}}}
4.5	427
22.2	428
99.1	429	== 6.3 If problem doesn't solve ==
1.1	430
32.6	431
23.2	432	(% 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:
1.1	433
	434	* End node console to show the transmit freuqency and DR.
37.3	435
1.1	436	* Gateway (from gateway UI) traffic to show the packet got from end node and receive from Server.
37.3	437
1.1	438	* Gateway traffic (from server UI) to shows the data exchange between gateway and server.
37.3	439
1.1	440	* End Node traffic (from server UI) to shows end node activity in server.
	441
99.1	442	= 7. Downlink Issue ~-~- Packet REJECTED, unsupported frequency =
1.1	443
32.7	444
4.5	445	(((
63.1	446	In LoRaWAN, the gateway will use the frequency specify by the server to transmit a packet as downlink purpose. Each Frequency band has different downlink frequency. and the gateway has a frequency range limited to transmit downlink.
4.5	447	)))
1.1	448
4.5	449	(((
	450
	451	)))
	452
	453	(((
1.1	454	So if the LoRaWAN server is an AS923 server which ask the gateway to transmit at 923.2Mhz frequency, but the gateway is IN868 frequency band (support 865~~867Mhz to transmit). In the gateway log it will show something like below:
4.5	455	)))
1.1	456
4.7	457	{{{Sat Nov 21 08:04:17 2020 daemon.info lora_pkt_fwd[1680]: ERROR~ Packet REJECTED, unsupported frequency - 923200000 (min:865000000,max:867000000)}}}
1.1	458
4.5	459	(((
4.6	460
	461	)))
	462
	463	(((
1.1	464	In this case, please double check the gateway frequency and the server frequency band.
4.5	465	)))
1.1	466
	467
99.1	468	= 8. Decrypt a LoRaWAN Packet =
1.1	469
	470
70.1	471	(% style="color:blue" %)1. LHT65N End device configure:
1.1	472
32.7	473	Change to ABP Mode: AT+NJM=0
37.3	474
70.1	475	Change to fix frequency: AT+CHE=1
37.3	476
32.7	477
70.1	478	AT+CFG(Print configuration):
32.12	479
80.1	480	[[image:image-20240129170603-7.png\|\|height="697" width="545"]][[image:image-20240129163741-3.png\|\|height="694" width="565"]]
1.1	481
29.2	482
32.16	483
70.1	484	Configuration:
1.1	485
70.1	486	[[image:image-20240129164219-4.png\|\|height="612" width="440"]]
1.1	487
29.2	488
1.1	489
70.1	490	(% style="color:blue" %)2. In LPS8-v2, configure to receive above message
1.1	491
70.1	492	[[image:image-20240129164326-5.png\|\|height="506" width="1114"]]
29.2	493
32.16	494
70.1	495	In LPS8-v2 console, we can see the Base64 receive are:
1.1	496
70.1	497	[[image:image-20240129170137-6.png\|\|height="459" width="1116"]]
1.1	498
70.1	499
	500
91.1	501	(% style="color:blue" %)3. Decode the info in CMD(Command prompt window)
70.1	502
91.1	503	LoRa packet Base64 format: QP~/~/~/~/+AFQACZv8Hjmc8gFTAkhMzU+75 (from LPS8-v2)
1.1	504
80.1	505	Then the instructions and format parsed in SecureCRT are: ./node_modules/.bin/lora-packet-decode ~-~-base64 QP~/~/~/~/+AFQACZv8Hjmc8gFTAkhMzU+75
1.1	506
	507
91.1	508	Step1: Open CMD, Enter the gateway IP and port.(ssh root@gateway IP -p 22)
32.9	509
91.1	510	[[image:image-20240129190752-17.png\|\|height="338" width="901"]]
1.1	511
91.1	512	[[image:image-20240129191937-21.png\|\|height="450" width="901"]]
1.1	513
	514
91.1	515	Step2: Enter the command to download the LoRa parsing package.(npm install lora-packet)
80.1	516
91.1	517	[[image:image-20240129192239-22.png\|\|height="416" width="902"]]
80.1	518
91.1	519	[[image:image-20240129192549-23.png\|\|height="459" width="898"]]
80.1	520
	521
91.1	522	Step3: Parse the gateway raw payload.(./node_modules/.bin/lora-packet-decode ~-~-base64 QP~/~/~/~/+AFQACZv8Hjmc8gFTAkhMzU+75)
80.1	523
	524
	525
	526
91.1	527	[[image:image-20240129192908-24.png\|\|height="477" width="907"]]
80.1	528
	529
91.1	530	[[image:image-20240129192954-25.png\|\|height="485" width="916"]]
80.1	531
91.1	532
	533
	534
	535
	536
	537
99.1	538	= 9. Why I see uplink 0x00 periodically on the LHT65 v1.8 firmware =
1.1	539
32.9	540
1.1	541	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.
	542
29.3	543
99.1	544	= 10. Why do I see a "MIC Mismatch" error message from the server? =
1.1	545
32.9	546
4.7	547	(((
32.9	548	1) If the user receives a "MIC Mismatch" message after registering the node on the server.
4.7	549	)))
1.1	550
4.7	551	(((
1.1	552	It is likely that the user filled in the wrong APPKEY when registering the node. Many users fill in "APPSKEY".
4.7	553	)))
1.1	554
4.7	555	* (((
	556	Please note the distinction between "APPKEY" and "APPSKEY".
	557	)))
1.1	558
4.7	559	(((
1.1	560	2）If the node works on the server for a period of time, the device stops working and receives a "MIC Mismatch" message.
4.7	561	)))
1.1	562
4.7	563	(((
1.1	564	The user needs a USB-TTL adapter to connect the serial port to modify the node APPKEY.
4.7	565	)))
1.1	566
4.7	567	* (((
	568	If a node is registered with multiple servers, it may also cause the "mic mismatch" error.
39.1	569	)))
5.1	570
39.1	571	(% class="wikigeneratedid" %)
	572	3）Wrong Regional Parameters version selected
	573	We generally use versions above 1.0.2
32.9	574
39.1	575	(% class="wikigeneratedid" %)
	576	[[image:image-20230322163227-1.png]]
1.1	577
39.1	578	(% class="wikigeneratedid" %)
	579	4）We have had cases where it was automatically fixed the next day despite no manual changes, probably a server side issue
	580
39.2	581
99.1	582	= 11. Why I got the payload only with "0x00" or "AA~=~="? =
1.1	583
32.9	584
41.1	585	(% style="color:blue" %)Why sensor sends 0x00?
35.1	586
41.1	587	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.
1.1	588
41.1	589	Possible Case 1:
1.1	590
41.1	591	Sensor has ADR=1 enable and sensor need to reply server MAC command (ADR request) while sensor has DR=0.
40.1	592
1.1	593
41.1	594	Possible Case 2:
33.1	595
41.1	596	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.
40.1	597
41.1	598
37.3	599	(% style="color:blue" %)How to solve:
35.1	600
40.1	601	Solution:
35.1	602
41.1	603	~1. Use the decoder to filter out this 0x00 packet. (Recommand)
40.1	604
	605	2. Data rate changed from DR3 to DR5, increasing upload byte length
	606	AT+ADR=0
	607	AT+DR=3
	608
	609	Downlink：
	610
	611	[[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]]
	612
34.1	613	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]]
6.1	614
32.9	615
99.1	616	= 12. Why my Dev EUI and APP EUI is 0x000000000000, how to solve? =
5.1	617
32.9	618
29.4	619	(((
7.1	620	It is possible the keys is erased during upgrading of firmware. and the console output shows below after AT+CFG
29.4	621	)))
5.1	622
29.4	623	(((
5.1	624	AT+APPKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
29.4	625	)))
5.1	626
29.4	627	(((
5.1	628	AT+NWKSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
29.4	629	)))
5.1	630
29.4	631	(((
5.1	632	AT+APPSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
29.4	633	)))
5.1	634
29.4	635	(((
5.1	636	AT+APPEUI=00 00 00 00 00 00 00 00
29.4	637	)))
5.1	638
29.4	639	(((
	640
	641	)))
5.1	642
29.4	643	(((
5.1	644	You can get the keys from the box sticker or send mail to Dragino Support to check keys with the provided SN number.
29.4	645	)))
5.1	646
29.4	647	(((
5.1	648	You can rewrites the keys by running commands in AT Console
32.9	649
	650
29.4	651	)))
5.1	652
29.4	653	(((
	654	For example：
	655	)))
5.1	656
29.4	657	(((
8.1	658	AT+APPKEY=85 41 47 20 45 58 28 14 16 82 A0 F0 80 0D DD EE
29.4	659	)))
5.1	660
29.4	661	(((
8.1	662	AT+NWKSKEY=AA CC B0 20 30 45 37 32 14 1E 14 93 E2 3B 20 11
29.4	663	)))
8.1	664
29.4	665	(((
8.1	666	AT+APPSKEY=11 23 02 20 30 20 30 60 80 20 20 30 30 20 10 10
29.4	667	)))
8.1	668
29.4	669	(((
8.1	670	AT+APPEUI=2C 45 47 E3 24 12 23 24
29.4	671	)))
8.1	672
29.4	673	(((
8.1	674	(Any combination of 16 bit codes can be used）
32.1	675
	676
99.1	677	= 13. I set my device is LoRaWAN Class C mode, why I still see Class A after boot? =
29.4	678	)))
8.1	679
	680
32.1	681	Class C only refers to status after OTAA Join successfully. The OTAA Join Process will use Class A mode.
	682
	683
99.1	684	= 14. Why it takes longer time for OTAA joined in US915/CN470/AU915 band? =
32.1	685
37.1	686
50.1	687	In US915, AU915 or CN470 frequency band, there are 8 sub-bands, totally 72 channels. and LoRaWAN server normally use only one sub-band, for example Sub-band 2 in TTN. The gateway also configured to Sub-band 2 and cover eight channels in this sub-band. If the end node transfer data in Sub-band 2, it will reach to gateway and to the LoRaWAN server. If the end node transfer packets in other sub-bands, for example sub-band 1, the packet won't arrive both gateway or LoRaWAN server.
37.1	688
	689
50.1	690	In Dragino Sensors old version firmware (before early 2022), the sub-band is fixed the sub-band to 2 , but this cause a problem, the end node is hard to use in other subband and need program. So the new logic is as below:
37.1	691
50.1	692	We have improved this, the end node will use frequency 1 from sub-band1, then frequency 1 from sub-band2, then frequency 1 from sub-band3, etc to process the OTAA join, in this case, in this case, the end node can support LoRaWAN servers with different sub-bands. To make sure the end node will only transmit the proper sub-band after OTAA Joined successfully, the end node will:
37.1	693
	694	* (((
50.1	695	Check what sub-band the LoRaWAN server ask from the OTAA Join Accept message and switch to that sub-band.
37.1	696	)))
	697	* (((
50.1	698	Use the Join successful sub-band if the server doesn't include sub-band info in the OTAA Join Accept message (TTN v2 doesn't include).
37.1	699	)))
	700
50.1	701	This change will make the activation time a little longer but make sure the device can be used in any sub-band.
37.1	702
	703
50.1	704	Below is a photo to show why it takes longer time for OTAA Join. We can see in 72 channels mode, why it takes more time to join success. If users want to have faster OTAA Join success, he can change default CHE to the sub-band he uses.
37.1	705
	706
	707	[[image:image-20221215223215-1.png\|\|height="584" width="1280"]]

Wiki source code of LoRaWAN Communication Debug

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