Wiki source code of LoRaWAN Communication Debug

Version 50.1 by Mengting Qiu on 2024/01/23 17:11

version	line-number	content
32.2	1	~ Table of Contents:
1.1	2
	3	{{toc/}}
	4
	5
30.2	6
50.1	7	= 1.Join process page check =
1.1	8
	9	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	10	\\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	11
	12	* End node console to show the Join freuqency and DR. (If possible)
37.3	13
1.1	14	* Gateway (from gateway UI) traffic to show the packet got from end node and receive from Server. (If possible)
37.3	15
1.1	16	* Gateway traffic (from server UI) to shows the data exchange between gateway and server. (Normaly possible)
37.3	17
1.1	18	* End Node traffic (from server UI) to shows end node activity in server. (Normaly possible)
37.3	19
1.1	20	* 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)
	21
32.14	22	(% style="color:blue" %)1. End Device Join Screen shot, we can check:
	23
1.1	24	* If the device is sending join request to server?
37.3	25
1.1	26	* What frequency the device is sending?
	27
37.2	28	[[image:image-20220526164956-15.png\|\|height="591" width="1153"]]
1.1	29
	30	Console Output from End device to see the transmit frequency
	31
	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
10.2	40	[[image:image-20220526163608-2.png]]
1.1	41
	42	Console Output from Gateway to see packets between end node and server.
	43
	44
35.2	45
49.1	46	(% style="color:blue" %)3. Gateway Live data in LoRaWAN Server
1.1	47
49.1	48	* Does the gateway real-time data contain information about Join Request? If not, check the internet connection and gateway LoRaWAN server Settings.
37.3	49
49.1	50	* 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	51
1.1	52	* 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.
	53
13.2	54	[[image:image-20220526163633-3.png]]
1.1	55
49.1	56	The Traffic for the End node in the server, use TTN as example.
1.1	57
	58
35.2	59
32.14	60	(% style="color:blue" %)4. Data Page in LoRaWAN server
1.1	61
	62	* 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.
	63
49.1	64	[[image:image-20240123150720-1.png\|\|height="459" width="1182"]]
1.1	65
	66	The data for the end device set in server
	67
35.2	68
49.1	69	[[image:image-20240123150943-2.png\|\|height="556" width="1179"]]
1.1	70
49.1	71	Check if OTAA Keys match the keys in device.
1.1	72
	73
2.1	74	= 2. Notice of US915/CN470/AU915 Frequency band =
1.1	75
32.3	76
4.2	77	(((
50.1	78	If user has problem to work with LoRaWAN server in band US915/AU915/CN470, he can check:
4.2	79	)))
1.1	80
4.2	81	* (((
50.1	82	What sub-band the server support?
4.2	83	)))
	84	* (((
50.1	85	What is the sub-band the gateway support?
4.2	86	)))
	87	* (((
50.1	88	What is the sub-band the end node is using?
4.2	89	)))
1.1	90
4.2	91	(((
1.1	92	All of above should match so End Node can properly Join the server and don't have packet lost.
4.2	93	)))
1.1	94
4.2	95	(((
	96
	97	)))
	98
	99	(((
50.1	100	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	101	)))
1.1	102
4.2	103	(((
	104
	105	)))
	106
	107	(((
50.1	108	Here are the frequency tables for these bands as reference:
4.2	109	)))
1.1	110
14.2	111	[[image:image-20220526163801-6.png]]
1.1	112
	113	US915 Channels
	114
35.2	115
18.2	116	[[image:image-20220526163926-7.png]]
1.1	117
	118	AU915 Channels
	119
32.3	120
18.2	121	[[image:image-20220526163941-8.png]]
1.1	122
4.4	123	(((
1.1	124	CN470 Channels
32.3	125
	126
4.4	127	)))
1.1	128
4.3	129	(((
1.1	130	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	131	)))
1.1	132
49.1	133	[[image:image-20240123151225-3.png\|\|height="434" width="902"]]
1.1	134
4.4	135	(((
1.1	136	TTN FREQUENCY PLAN
32.3	137
37.2	138	(% style="display:none" %) (%%)
4.4	139	)))
1.1	140
4.3	141	(((
1.1	142	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	143	)))
1.1	144
37.2	145	(% style="display:none" %) (%%)
1.1	146
49.1	147	= 3. Why I see data lost/ is not periodically uplink？ Even the signal strength is good =
1.1	148
32.3	149
1.1	150	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:
	151
37.2	152	* (% 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	153
37.2	154	* (% 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.
	155
	156	* (% 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.
	157
4.3	158	(((
1.1	159	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	160	)))
1.1	161
4.3	162
	163	(((
1.1	164	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	165	)))
1.1	166
	167
2.1	168	= 4. Transmision on ABP Mode =
1.1	169
32.3	170
4.3	171	(((
1.1	172	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	173	)))
1.1	174
4.3	175	(((
1.1	176	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	177	)))
1.1	178
4.3	179	(((
1.1	180	To solve this, disable the Frame Counter Check will solve this issue , or reset the frame counter in the device page.
49.1	181
	182	[[image:image-20240123161737-4.png\|\|height="395" width="763"]]
4.3	183	)))
1.1	184
49.1	185	[[image:image-20240123161853-6.png\|\|height="599" width="771"]]
1.1	186
	187	Disable Frame Counter Check in ABP Mode
	188
	189
2.1	190	= 5. Downstream Debug =
1.1	191
2.1	192	== 5.1 How it work ==
1.1	193
32.3	194
1.1	195	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.
	196
4.3	197	(((
49.1	198	Depends on Class A or Class C, the receive windows will be a little difference.
4.3	199	)))
1.1	200
31.2	201	[[image:image-20220531161828-1.png]]
1.1	202
	203	receive windows for Class A and Class C
	204
32.3	205
1.1	206	Below are the requirement for the End Device to receive the packets.
	207
	208	* The End Device must open the receive windows: RX1 or RX2
37.2	209
1.1	210	* The LoRaWAN server must send a downstream packet, and the gateway forward this downstream packet for this end node.
37.2	211
1.1	212	* This downstream packet must arrive to the end node while RX1 or RX2 is open.
37.2	213
1.1	214	* This packet must match the frequency of the RX1 or RX2 window.
37.2	215
32.3	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.
1.1	217
49.1	218	== ==
	219
2.1	220	== 5.2 See Debug Info ==
1.1	221
32.3	222
4.6	223	(((
32.3	224	(% style="color:blue" %)For LoRaWAN Server
4.6	225	)))
1.1	226
4.6	227	(((
1.1	228	We can check if there is downlink message for this end node, use TTN for example:
4.6	229	)))
1.1	230
4.6	231	(((
49.1	232	Configure a downlink to the end device
4.6	233	)))
1.1	234
49.1	235	[[image:image-20240123163307-7.png\|\|height="330" width="1125"]]
1.1	236
4.6	237	(((
1.1	238	Set a downstream in TTN and see it is sent
4.6	239	)))
1.1	240
	241
4.3	242	(((
1.1	243	This downstream info will then pass to the gateway downstream list. and include the DR which is used (SF9BW125) in EU868 is DR3
4.3	244	)))
1.1	245
22.2	246	[[image:image-20220526164650-13.png]]
1.1	247
4.6	248	(((
1.1	249	Gateway Traffic can see this downstream info
4.6	250	)))
1.1	251
	252
32.16	253
4.6	254	(((
32.3	255	(% style="color:blue" %)For LoRaWAN Gateway
4.6	256	)))
1.1	257
4.3	258	(((
1.1	259	When the downstream packet appear on the traffic of Gateway page. The LoRaWAN gateway can get it from LoRaWAN server and transmit it. In Dragion Gateway, this can be checked by runinng "logread -f" in the SSH console. and see below:
4.3	260	)))
1.1	261
22.2	262	[[image:image-20220526164734-14.png]]
1.1	263
4.6	264	(((
1.1	265	Gateway Sent out this packet
4.6	266	)))
1.1	267
	268
32.16	269
4.6	270	(((
32.3	271	(% style="color:blue" %)For End Node
4.6	272	)))
1.1	273
4.8	274	(((
1.1	275	we can use AT Command (AT+CFG) to check the RX1 configure and RX2 configure. as below:
4.8	276	)))
1.1	277
4.9	278	(((
37.3	279	* (% style="color:#037691" %)AT+RX2FQ=869525000 (%%) ~-~--> The RX2 Window frequency
32.4	280
37.3	281	* (% style="color:#037691" %)AT+RX2DR=3 (%%) ~-~--> The RX2 DataRate
32.16	282
37.3	283	* (% style="color:#037691" %)AT+RX1DL=1000 (%%) ~-~--> Receive Delay 1
	284
	285	* (% style="color:#037691" %)AT+RX2DL=2000 (%%) ~-~--> Receive Delay 2
4.9	286	)))
	287
	288	(((
32.3	289	(% style="color:blue" %)when the device running, we can see below info:
4.7	290	)))
1.1	291
4.8	292	{{{ [12502]*** UpLinkCounter= 0 ***
	293	[12503]TX on freq 868500000 Hz at DR 0
	294	[13992]txDone
4.13	295	[15022]RX on freq 868500000 Hz at DR 0 --> RX1 window open at frequency: 868500000, DR0, after 15022-13992= 1030ms of txdone
	296	[15222]rxTimeOut --> no packet arrive in RX1 window. (duration: 200ms)
	297	[15987]RX on freq 869525000 Hz at DR 3 --> RX2 window open at frequency: 869525000, DR3, after 15987-13992= 1995ms of txdone
	298	[16027]rxTimeOut --> no packet arrive in RX2 window. (duration: 40 ms)}}}
1.1	299
4.3	300	(((
4.5	301
32.16	302
	303
4.5	304	)))
	305
4.7	306	(((
32.3	307	(% style="color:blue" %)Another message:
4.7	308	)))
4.5	309
4.8	310	{{{ [12502]*** UpLinkCounter= 0 ***
	311	[12503]TX on freq 868100000 Hz at DR 0
	312	[13992]txDone
	313	[15022]RX on freq 868100000 Hz at DR 0
	314	[15222]rxTimeOut
	315	[15987]RX on freq 869525000 Hz at DR 3
4.13	316	[16185]rxDone --> We have got the downstream packet.
4.8	317	Rssi= -64
	318	Receive data
	319	1:0012345678}}}
4.5	320
22.2	321
32.6	322	== 5.3 If problem doesn't solve ==
1.1	323
32.6	324
23.2	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:
1.1	326
	327	* End node console to show the transmit freuqency and DR.
37.3	328
1.1	329	* Gateway (from gateway UI) traffic to show the packet got from end node and receive from Server.
37.3	330
1.1	331	* Gateway traffic (from server UI) to shows the data exchange between gateway and server.
37.3	332
1.1	333	* End Node traffic (from server UI) to shows end node activity in server.
	334
2.1	335	= 6. Downlink Issue ~-~- Packet REJECTED, unsupported frequency =
1.1	336
32.7	337
4.5	338	(((
1.1	339	In LoRaWAN, the gatewat 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	340	)))
1.1	341
4.5	342	(((
	343
	344	)))
	345
	346	(((
1.1	347	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	348	)))
1.1	349
4.7	350	{{{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	351
4.5	352	(((
4.6	353
	354	)))
	355
	356	(((
1.1	357	In this case, please double check the gateway frequency and the server frequency band.
4.5	358	)))
1.1	359
	360
2.1	361	= 7. Decrypt a LoRaWAN Packet =
1.1	362
	363
32.7	364	(% style="color:blue" %)1. LHT65 End device configure:
1.1	365
32.7	366	Change to ABP Mode: AT+NJM=0
37.3	367
32.7	368	Change to fix frequency: AT+CHS=904900000
37.3	369
32.7	370	Change to fix DR: AT+DR=0
	371
32.12	372
29.2	373	[[image:image-20220526165525-16.png]]
1.1	374
29.2	375
32.16	376
32.7	377	(% style="color:blue" %)2. In LG02 , configure to receive above message
1.1	378
29.2	379	[[image:image-20220526165612-17.png]]
1.1	380
29.2	381
1.1	382	In LG02 console, we can see the hex receive are:
	383
29.2	384	[[image:image-20220526171112-21.png]]
1.1	385
29.2	386
32.16	387
32.7	388	(% style="color:blue" %)3. Decode the info in web
1.1	389
	390	[[https:~~/~~/lorawan-packet-decoder-0ta6puiniaut.runkit.sh>>url:https://lorawan-packet-decoder-0ta6puiniaut.runkit.sh/]]
	391
	392	Need these three fields:
	393
	394	LoRa packet hex format: 40c1190126800100024926272bf18bbb6341584e27e23245 (from LG02)
	395
	396	AT+NWKSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 11 (End node Network Session Key)
	397
	398	AT+APPSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 11 (End Node App Session Key)
	399
32.9	400
1.1	401	[[https:~~/~~/lorawan-packet-decoder-0ta6puiniaut.runkit.sh/?data=40c1190126800100024926272bf18bbb6341584e27e23245&nwkskey=00000000000000000000000000000111&appskey=00000000000000000000000000000111>>url:https://lorawan-packet-decoder-0ta6puiniaut.runkit.sh/?data=40c1190126800100024926272bf18bbb6341584e27e23245&nwkskey=00000000000000000000000000000111&appskey=00000000000000000000000000000111]]
	402
29.2	403	[[image:image-20220526171029-20.png]]
1.1	404
4.10	405	(((
4.11	406	The FRMPayload is the device payload.
4.10	407	)))
1.1	408
	409
50.1	410	= 8. Why I see uplink 0x00 periodically on the LHT65 v1.8 firmware =
1.1	411
32.9	412
1.1	413	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.
	414
29.3	415
2.1	416	= 9. Why do I see a "MIC Mismatch" error message from the server? =
1.1	417
32.9	418
4.7	419	(((
32.9	420	1) If the user receives a "MIC Mismatch" message after registering the node on the server.
4.7	421	)))
1.1	422
4.7	423	(((
1.1	424	It is likely that the user filled in the wrong APPKEY when registering the node. Many users fill in "APPSKEY".
4.7	425	)))
1.1	426
4.7	427	* (((
	428	Please note the distinction between "APPKEY" and "APPSKEY".
	429	)))
1.1	430
4.7	431	(((
1.1	432	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	433	)))
1.1	434
4.7	435	(((
1.1	436	The user needs a USB-TTL adapter to connect the serial port to modify the node APPKEY.
4.7	437	)))
1.1	438
4.7	439	* (((
	440	If a node is registered with multiple servers, it may also cause the "mic mismatch" error.
39.1	441	)))
5.1	442
39.1	443	(% class="wikigeneratedid" %)
	444	3）Wrong Regional Parameters version selected
	445	We generally use versions above 1.0.2
32.9	446
39.1	447	(% class="wikigeneratedid" %)
	448	[[image:image-20230322163227-1.png]]
1.1	449
39.1	450	(% class="wikigeneratedid" %)
	451	4）We have had cases where it was automatically fixed the next day despite no manual changes, probably a server side issue
	452
39.2	453
2.1	454	= 10. Why i got the payload only with "0x00" or "AA~=~="? =
1.1	455
32.9	456
41.1	457	(% style="color:blue" %)Why sensor sends 0x00?
35.1	458
41.1	459	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	460
41.1	461	Possible Case 1:
1.1	462
41.1	463	Sensor has ADR=1 enable and sensor need to reply server MAC command (ADR request) while sensor has DR=0.
40.1	464
1.1	465
41.1	466	Possible Case 2:
33.1	467
41.1	468	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	469
41.1	470
37.3	471	(% style="color:blue" %)How to solve:
35.1	472
40.1	473	Solution:
35.1	474
41.1	475	~1. Use the decoder to filter out this 0x00 packet. (Recommand)
40.1	476
	477	2. Data rate changed from DR3 to DR5, increasing upload byte length
	478	AT+ADR=0
	479	AT+DR=3
	480
	481	Downlink：
	482
	483	[[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]]
	484
34.1	485	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	486
32.9	487
5.1	488	= 11. Why my Dev EUI and APP EUI is 0x000000000000, how to solve? =
	489
32.9	490
29.4	491	(((
7.1	492	It is possible the keys is erased during upgrading of firmware. and the console output shows below after AT+CFG
29.4	493	)))
5.1	494
29.4	495	(((
5.1	496	AT+APPKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
29.4	497	)))
5.1	498
29.4	499	(((
5.1	500	AT+NWKSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
29.4	501	)))
5.1	502
29.4	503	(((
5.1	504	AT+APPSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
29.4	505	)))
5.1	506
29.4	507	(((
5.1	508	AT+APPEUI=00 00 00 00 00 00 00 00
29.4	509	)))
5.1	510
29.4	511	(((
	512
	513	)))
5.1	514
29.4	515	(((
5.1	516	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	517	)))
5.1	518
29.4	519	(((
5.1	520	You can rewrites the keys by running commands in AT Console
32.9	521
	522
29.4	523	)))
5.1	524
29.4	525	(((
	526	For example：
	527	)))
5.1	528
29.4	529	(((
8.1	530	AT+APPKEY=85 41 47 20 45 58 28 14 16 82 A0 F0 80 0D DD EE
29.4	531	)))
5.1	532
29.4	533	(((
8.1	534	AT+NWKSKEY=AA CC B0 20 30 45 37 32 14 1E 14 93 E2 3B 20 11
29.4	535	)))
8.1	536
29.4	537	(((
8.1	538	AT+APPSKEY=11 23 02 20 30 20 30 60 80 20 20 30 30 20 10 10
29.4	539	)))
8.1	540
29.4	541	(((
8.1	542	AT+APPEUI=2C 45 47 E3 24 12 23 24
29.4	543	)))
8.1	544
29.4	545	(((
8.1	546	(Any combination of 16 bit codes can be used）
32.1	547
	548
	549	= 12. I set my device is LoRaWAN Class C mode, why i still see Class A after boot? =
29.4	550	)))
8.1	551
	552
32.1	553	Class C only refers to status after OTAA Join successfully. The OTAA Join Process will use Class A mode.
	554
	555
37.1	556	= 13. Why it takes longer time for OTAA joined in US915/CN470/AU915 band? =
32.1	557
37.1	558
50.1	559	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	560
	561
50.1	562	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	563
50.1	564	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	565
	566	* (((
50.1	567	Check what sub-band the LoRaWAN server ask from the OTAA Join Accept message and switch to that sub-band.
37.1	568	)))
	569	* (((
50.1	570	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	571	)))
	572
50.1	573	This change will make the activation time a little longer but make sure the device can be used in any sub-band.
37.1	574
	575
50.1	576	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	577
	578
	579	[[image:image-20221215223215-1.png\|\|height="584" width="1280"]]
	580
29.3	581	(% class="wikigeneratedid" %)
	582

Wiki source code of LoRaWAN Communication Debug

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