Wiki source code of LWL02 -- LoRaWAN Water Leak Sensor User Manual

Last modified by Bei Jinggeng on 2024/04/25 11:41

version	line-number	content
61.5	1
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2.2	3	(% style="text-align:center" %)
48.2	4	[[image:image-20220927133941-2.png]]
1.1	5
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36.1	8
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33.4	13	Table of Contents:
1.1	14
17.3	15	{{toc/}}
1.1	16
	17
	18
17.3	19
	20
36.2	21
	22
	23
	24
2.2	25	= 1. Introduction =
1.1	26
2.2	27	== 1.1 What is LWL02 LoRaWAN Water Leak Sensor ==
1.1	28
	29
3.2	30	(((
2.2	31	The Dragino LWL02 is a (% style="color:#4f81bd" %)LoRaWAN Water Sensor(%%). When there is water between the two metal probes, LWL02 indicates a water leak event and uplink to IoT server via LoRaWAN network.
3.2	32	)))
1.1	33
3.2	34	(((
2.2	35	LWL02 is powered by (% style="color:#4f81bd" %)2 x AAA batteries(%%) and target for long time use, these two batteries can provide about 16,000 ~~ 70,000 uplink packets, which result in 2 ~~ 10 years battery life. After battery running out, user can easily open the enclosure and replace with 2 common AAA batteries.
3.2	36	)))
1.2	37
3.2	38	(((
2.2	39	The LWL02 will send periodically data every day as well as for each water leak event. It also (% style="color:#4f81bd" %)counts the water leak times(%%) and (% style="color:#4f81bd" %)calculate last water leak duration(%%). User can also disable the uplink for each water leak event, instead, device can count each event and uplink periodically.
3.2	40	)))
1.2	41
3.2	42	(((
	43	Each LWL02 is (% style="color:#4f81bd" %)pre-load with a set of unique keys(%%) for LoRaWAN registration, register these keys to LoRaWAN server and it will auto connect after power on.
41.2	44
	45
3.2	46	)))
1.2	47
44.2	48	[[image:image-20220927113420-3.png]]
1.2	49
	50
3.3	51	== 1.2 Features ==
1.2	52
40.2	53
1.2	54	* LoRaWAN Class A v1.0.3
	55	* Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865/RU864
	56	* SX1262 LoRa Core
	57	* Water Leak detect
	58	* 2 x AAA LR03 Batteries
	59	* AT Commands to change parameters
	60	* Uplink on periodically and open/close action
	61	* Remote configure parameters via LoRa Downlink
	62	* Firmware upgradable via program port
	63
61.4	64	== 1.3 Storage & Operation Temperature ==
3.4	65
40.2	66
61.3	67	-10 ~~ 50 °C or -40 ~~ 60 °C (depends on battery type, see [[FAQ>>\|\|anchor="H7.6Whyiseedifferentworkingtemperatureforthedevice3F"]])
	68
	69
	70	== 1.4 Applications ==
	71
	72
1.2	73	* Smart Buildings & Home Automation
	74	* Logistics and Supply Chain Management
	75	* Smart Metering
	76	* Smart Agriculture
	77	* Smart Cities
	78	* Smart Factory
	79
61.3	80	== 1.5 Dimension ==
40.2	81
61.3	82
5.2	83	[[image:image-20220608143952-2.png]]
1.2	84
41.2	85
5.2	86	[[image:1654670405145-346.png]]
1.2	87
5.2	88
61.3	89	== 1.6 Firmware Change log ==
5.2	90
40.2	91
26.8	92	(((
40.2	93	LWL02 use the same firmware as LDS01: [[https:~~/~~/www.dropbox.com/sh/6ls5i0zsvujvbc8/AABe3V5aQXdy7zSxEdEA3DHOa?dl=0>>https://www.dropbox.com/sh/6ls5i0zsvujvbc8/AABe3V5aQXdy7zSxEdEA3DHOa?dl=0]]
26.8	94	)))
1.2	95
	96
5.2	97	= 2. Power ON LWL02 =
1.2	98
40.2	99
5.3	100	When receive the LWL02, please open the enclosure and add 2 x AAA batteries to power it. The [[LED>>\|\|anchor="H4.7LEDs"]] will blink when device is powered.
1.2	101
	102
7.2	103	= 3. How to install LWL02 =
1.2	104
61.1	105	Fixed way:
40.2	106
61.1	107	* Open the shell, screw through the reserved mounting hole, fix the bottom of the shell at the fixed position, and install the main body of the node.
	108
	109	[[image:image-20231222114059-1.jpeg\|\|height="412" width="624"]]
	110
	111	* Stick the double-sided glue on the bottom of the shell, and stick it directly in the fixed position.
	112
	113	[[image:image-20231222114211-2.jpeg\|\|height="409" width="613"]]
	114
	115
7.4	116	(((
37.5	117	When install the LWL02 on wall. Please install as below so the water leak probe will be soak in water for water detect purpose. The LWL02 main body is not water proof. Please don't let water go inside the LWL02 main body.
40.2	118
	119
7.4	120	)))
1.2	121
7.2	122	[[image:image-20220608144447-4.png]]
1.2	123
	124
7.2	125	= 4. Operation Mode =
1.2	126
7.2	127	== 4.1 How it works? ==
1.2	128
40.2	129
26.5	130	(((
7.3	131	The LWL02 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and [[power on>>\|\|anchor="H2.PowerONLWL02"]] the LWL02. It will auto join the network via OTAA.
26.5	132	)))
1.2	133
26.5	134	(((
37.5	135	In case user can't set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>\|\|anchor="H6.UseATCommand"]] to set the keys in the devices.
26.5	136	)))
1.2	137
	138
7.3	139	== 4.2 Example to join LoRaWAN network ==
7.2	140
40.2	141
1.6	142	Here shows an example for how to join the [[TTN V3 Network>>url:https://eu1.cloud.thethings.network/]]. Below is the network structure, we use [[LG308>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/140-lg308.html]] as LoRaWAN gateway here.
1.2	143
44.2	144	[[image:image-20220927113401-2.png]]
1.2	145
	146
9.6	147	(((
1.2	148	The LWL02 has water leak detect probe as above. When there is water between these two detect probe, they will be short and generate the water leak event. and send the status to LoRaWAN server. The LWL02 will uplink two type of messages to the server.
9.6	149	)))
1.2	150
9.6	151	* (((
	152	A keep-alive message which send once per day.
	153	)))
	154	* (((
24.9	155	An emergency event message when detect a water leak. ([[Alarm event can be disabled>>\|\|anchor="H7.3CanIdisableuplinkforeacheventtosavebatterylife3F"]])
9.6	156	)))
	157	* (((
	158	A periodically update at every 10 minutes when in water leak.
	159	)))
	160	* (((
17.5	161	A message when switch from water leak to none water leak. ([[Alarm event can be disabled>>\|\|anchor="H7.3CanIdisableuplinkforeacheventtosavebatterylife3F"]])
9.6	162	)))
1.2	163
9.6	164	(((
29.2	165
	166
1.2	167	The LG308 is already set to connect to [[TTN V3 network >>url:https://eu1.cloud.thethings.network/]]. What we need to now is only configure the TTN V3:
9.6	168	)))
1.2	169
9.6	170	(((
9.5	171	(% style="color:blue" %)Step 1(%%): Create a device in TTN V3 with the OTAA keys from LWL02.
9.6	172	)))
1.2	173
9.6	174	(((
1.2	175	Each LWL02 is shipped with a sticker with unique device EUI:
9.6	176	)))
1.2	177
58.2	178	[[image:image-20230426084834-1.png\|\|height="239" width="515"]]
1.2	179
	180
	181	User can enter this key in their LoRaWAN Server portal. Below is TTN V3 screen shot:
	182
40.2	183
14.3	184	Add APP EUI in the application
1.2	185
11.2	186	[[image:1654671794691-956.png]]
1.2	187
	188
11.2	189	[[image:1654671809850-574.png]]
1.2	190
12.2	191	[[image:1654671820156-640.png]]
1.2	192
	193
13.2	194	[[image:1654671832011-696.png]]
1.2	195
	196
14.2	197	Add APP KEY and DEV EUI
1.2	198
32.7	199	[[image:1654671889112-678.png]]
1.2	200
32.7	201
40.2	202
24.10	203	(% style="color:blue" %)Step 2(%%): [[Power on>>\|\|anchor="H2.PowerONLWL02"]] LWL02 and it will auto join to the TTN V3 network. After join success, it will start to upload message to TTN V3 and user can see in the panel.
1.2	204
	205
33.2	206	[[image:1654681465260-713.png]]
1.2	207
32.8	208
14.5	209	== 4.3 Uplink Payload ==
	210
26.11	211
49.1	212	Uplink Payload total 10 bytes.
1.2	213
61.5	214	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:500px" %)
61.6	215	\|(% style="background-color:#4f81bd; color:white; width:60px" %)Size(bytes)\|(% style="background-color:#4f81bd; color:white; width:60px" %)2\|(% style="background-color:#4f81bd; color:white; width:60px" %)1\|(% style="background-color:#4f81bd; color:white; width:100px" %)3\|(% style="background-color:#4f81bd; color:white; width:110px" %)3\|(% style="background-color:#4f81bd; color:white; width:110px" %)1
61.5	216	\|value\|Status&BAT\|(((
49.1	217	MOD
	218	Always:0x02
49.2	219	)))\|(% style="width:126px" %)Total_water_leak_events\|(% style="width:140px" %)(((
49.1	220	Last water leak duration(unit:min)
49.2	221	)))\|(% style="width:186px" %)(((
49.11	222	Alarm status(Only used in
58.3	223	LWL02)Always:0x00
49.1	224	)))
	225
16.2	226	Example:
1.2	227
16.2	228	[[image:1654672186477-234.png]]
1.2	229
	230
16.3	231	(((
58.5	232	Example Payload Decoder in TTN V3: [[https:~~/~~/github.com/dragino/dragino-end-node-decoder>>https://github.com/dragino/dragino-end-node-decoder/tree/main/LWL02]]
16.3	233	)))
1.2	234
	235
16.4	236	== 4.4 Downlink Payload ==
1.2	237
26.9	238
61.5	239	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:505px" %)
	240	\|=(% style="width: 182px;background-color:#4F81BD;color:white" %)Downlink Control Type\|=(% style="width: 96px;background-color:#4F81BD;color:white" %)Type Code\|=(% style="width: 227px;background-color:#4F81BD;color:white" %)Downlink payload size(bytes)
16.7	241	\|(% style="width:180px" %)TDC (Transmit Time Interval—Keep Alive Interval)\|(% style="width:80px" %)0x01\|(% style="width:150px" %)4
	242	\|(% style="width:180px" %)RESET\|(% style="width:80px" %)0x04\|(% style="width:224px" %)2
17.4	243	\|(% style="width:180px" %)[[Set confirmed mode>>\|\|anchor="HTypeCode0x05"]]\|(% style="width:80px" %)0x05\|(% style="width:150px" %)2
	244	\|(% style="width:180px" %)[[Clear Counting>>\|\|anchor="HTypeCode0xA6"]]\|(% style="width:80px" %)0xA6\|(% style="width:150px" %)2
	245	\|(% style="width:180px" %)[[Enable/Disable Alarm>>\|\|anchor="HTypeCode0xA7"]]\|(% style="width:80px" %)0xA7\|(% style="width:150px" %)2
	246	\|(% style="width:180px" %)[[Control ADR/DR>>\|\|anchor="HTypeCode0xA8"]]\|(% style="width:80px" %)0xA8\|(% style="width:150px" %)3
	247	\|(% style="width:180px" %)[[Set Alarm Timeout>>\|\|anchor="HTypeCode0xA9"]]\|(% style="width:80px" %)0xA9\|(% style="width:150px" %)4
1.2	248
	249	Example Downlink payload setting in TTN V3:
	250
17.2	251	[[image:1654673412319-976.png]]
1.2	252
	253
17.3	254	=== (% style="color:#037691" %)Type Code 0x01(%%) ===
1.2	255
37.6	256	If the payload=0100003C, means to control the LWL02's Keep Alive interval to 0x00003C=60(S)
1.2	257
	258
17.3	259	=== (% style="color:#037691" %)Type Code 0x04(%%) ===
1.2	260
	261	If payload = 0x04FF, it will reset the LWL02.
	262
	263
17.3	264	=== (% style="color:#037691" %)Type Code 0x05(%%) ===
1.2	265
	266	0x05 00: Set uplink to LoRaWAN unconfirmed mode
	267
	268	0x05 01: Set uplink to LoRaWAN confirmed mode
	269
	270
17.3	271	=== (% style="color:#037691" %)Type Code 0xA6(%%) ===
1.2	272
	273	Example: 0xA601: Clear Counting
	274	For LWL02: reset both count number and time.
	275
	276
17.3	277	=== (% style="color:#037691" %)Type Code 0xA7(%%) ===
1.2	278
	279	0xA7 01 : Equal to AT+DISALARM=1
	280
	281	0xA7 00 : Equal to AT+DISALARM=0
	282
	283
17.3	284	=== (% style="color:#037691" %)Type Code 0xA8(%%) ===
1.2	285
	286	Format: 0xA8 aa bb
	287
	288	aa: 1: Enable ADR; 0: Disable ADR (Same as AT+CADR command)
	289
	290	bb: set DR (Same as AT+CDATARATE ,only valid after ADR=0)
	291
	292	Example: 0x A8 00 02 : Set ADR=0 and DR=1
	293
	294
17.3	295	=== (% style="color:#037691" %)Type Code 0xA9(%%) ===
1.2	296
17.7	297	See [[Alarm Base Timeout>>\|\|anchor="H4.6AlarmBaseonTimeout"]] for detail.
1.2	298
	299
17.8	300	== 4.5 Integrate with Datacake ==
1.2	301
40.2	302
21.5	303	(((
1.2	304	Datacake provides a human friendly interface to show the sensor data, once we have data in TTN V3, we can use Datacake to connect to TTN V3 and see the data in Datacake. Below are the steps:
21.5	305	)))
1.2	306
	307
19.2	308	(% style="color:blue" %)Step 1(%%): Be sure that your device is programmed and properly connected to the network at this time.
1.2	309
19.2	310	(% style="color:blue" %)Step 2(%%): To configure the Application to forward data to Datacake you will need to add integration. To add the Datacake integration, perform the following steps:
1.2	311
	312
19.2	313	[[image:1654674520913-519.png]]
1.2	314
	315
19.2	316	[[image:1654674530910-914.png]]
1.2	317
	318
21.2	319	[[image:1654674543078-401.png]]
1.2	320
	321
21.3	322	(% style="color:blue" %)Step 3(%%): Create an account or log in Datacake.
1.2	323
21.3	324	(% style="color:blue" %)Step 4(%%): Search LWL02 and add DevEUI.
1.2	325
21.2	326	[[image:1654674556510-911.png]]
1.2	327
	328
17.8	329	== 4.6 Alarm Base on Timeout ==
1.2	330
40.2	331
23.4	332	(((
39.1	333	LWL02 can monitor the timeout for a status change, this feature can be used to monitor some event such as monitoring water leakage duration etc.
41.1	334
	335	(% style="color:red" %)(This command is only applicable to LDS02.In lwl02, this command can only open the alarm, but the alarm time is fixed to 10 minutes）
23.4	336	)))
1.2	337
23.4	338	(((
1.2	339	User configure this feature by using:
23.4	340	)))
1.2	341
23.4	342	(((
	343
	344	)))
1.2	345
23.4	346	(((
21.5	347	(% style="color:blue" %)AT Command(%%) to configure:
23.4	348	)))
1.2	349
23.4	350	* (((
40.2	351	(% style="color:red" %)AT+TTRIG=1,30 (%%) ~-~-> When status change from close to open, and device keep in open
23.4	352	)))
1.2	353
23.4	354	(((
1.2	355	status for more than 30 seconds. LWL02 will send an uplink packet, the Alarm bit (the lowest bit of 10^^th^^ byte of payload) on this uplink packet is set to 1.
23.4	356	)))
1.2	357
23.4	358	* (((
40.2	359	(% style="color:red" %)AT+TTRIG=0,0 (%%) ~-~-> Default Value, disable timeout Alarm.
	360
	361
	362
23.4	363	)))
1.2	364
23.4	365	(((
21.5	366	(% style="color:blue" %)Downlink Command(%%) to configure:
23.4	367	)))
1.2	368
23.4	369	(((
21.6	370	Command: 0xA9 aa bb cc
23.4	371	)))
1.2	372
23.4	373	(((
1.2	374	A9: Command Type Code
23.4	375	)))
1.2	376
23.4	377	(((
1.2	378	aa: status to be monitor
23.4	379	)))
1.2	380
23.4	381	(((
1.2	382	bb cc: timeout.
23.4	383	)))
1.2	384
23.4	385	(((
	386
	387	)))
1.2	388
23.4	389	(((
1.2	390	If user send 0xA9 01 00 1E: equal to AT+TTRIG=1,30
23.4	391	)))
1.2	392
23.4	393	(((
1.2	394	Or
23.4	395	)))
1.2	396
23.4	397	(((
1.2	398	0xA9 00 00 00: Equal to AT+TTRIG=0,0. Disable timeout Alarm.
40.2	399
	400
23.4	401	)))
1.2	402
17.8	403	== 4.7 LEDs ==
1.2	404
25.9	405
61.5	406	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:463px" %)
	407	\|=(% style="width: 186px;background-color:#4F81BD;color:white" %)Action\|=(% style="width: 277px;background-color:#4F81BD;color:white" %)LED behavior
21.7	408	\|(% style="width:184px" %)Power On\|(% style="width:275px" %)(% style="color:green" %)GREEN on 1s, (% style="color:red" %)RED on 1s,(%%) (% style="color:blue" %)BLUE on 1s(%%)
	409	\|(% style="width:184px" %)Joined successful\|(% style="width:275px" %)(% style="color:green" %)GRENN LED (%%)on 5s
	410	\|(% style="width:184px" %)Send an uplink message\|(% style="width:275px" %)(% style="color:green" %)GREEN LED(%%) blinks once
	411	\|(% style="width:184px" %)Got a downlink message\|(% style="width:275px" %)(% style="color:blue" %)BLUE LED(%%) blinks once
1.2	412
21.8	413	= 5. Battery & How to replace =
	414
	415	== 5.1 Battery Type and replace ==
	416
40.2	417
22.3	418	(((
58.1	419	LWL02 is equipped with 2 x AAA LR03 batteries. If the batteries running low(see 2.3~~2.5v in the platform). User can buy generic AAA battery and replace it. Note:
22.3	420	)))
1.2	421
22.3	422	1. (((
37.6	423	The LWL02 doesn't have any screw, use can use nail to open it by the middle.
22.3	424	)))
	425	1. (((
	426	Make sure the direction is correct when install the AAA batteries.
	427	)))
1.2	428
22.3	429	(((
37.7	430	(% style="color:red" %)Important Notice: Make sure use new AAA LR03 battery and the battery doesn't have broken surface.
22.3	431	)))
1.2	432
22.3	433	(((
	434
	435	)))
1.2	436
22.3	437	(((
1.2	438	Example of AAA LR03 batter:
22.3	439	)))
1.2	440
22.2	441	[[image:1654675278044-307.png]]
1.2	442
	443
22.4	444	== 5.2 Power Consumption Analyze ==
	445
40.2	446
26.6	447	(((
1.2	448	Dragino battery powered products are all run in Low Power mode. User can check the guideline from this link to calculate the estimate battery life:
26.6	449	)))
1.2	450
26.6	451	(((
1.2	452	[[https:~~/~~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf>>url:https://www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf]]
26.6	453	)))
1.2	454
	455
22.4	456	= 6. Use AT Command =
1.2	457
22.4	458	== 6.1 Access AT Command ==
	459
40.2	460
1.2	461	LWL02 supports AT Command set. User can use a USB to TTL adapter to configure LWL02 via use AT command, as below.
	462
52.1	463	[[image:image-20221226104917-1.png\|\|height="557" width="850"]]
40.2	464
1.2	465
24.3	466	(((
24.2	467	In PC, User needs to set (% style="color:#037691" %)serial tool(%%)(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)115200(%%) to access to access serial console of LWL02. Below is the output for reference:
24.3	468	)))
1.2	469
24.3	470	(((
24.2	471	The AT Access password is (% style="color:red" %)123456.
24.3	472	)))
1.2	473
24.2	474	[[image:1654675618022-630.png]]
1.2	475
40.2	476
26.7	477	(((
24.4	478	Each AT Command need to (% style="color:red" %)add an ENTER(%%) at the end before send.
26.7	479	)))
1.2	480
26.7	481	(((
40.2	482	When entering the first command, the (% style="color:red" %)RED LED(%%) will on and user can now input AT Commands. After input all needed AT Commands, please input AT+CLPM=1 to set the device to work in Low Power mode and (% style="color:red" %)RED LED(%%) will be off.
26.7	483	)))
1.2	484
26.7	485	(((
1.2	486	More detail AT Command manual can be found at [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDS01/]]
26.7	487	)))
1.2	488
	489
1.5	490	= 7. FAQ =
	491
	492	== 7.1 How to upgrade the image? ==
	493
40.2	494
62.1	495	User can upgrade the of LWL02 for bug fix, new features, or change working region. The upgrade instruction is here: [[LDS02/LWL02 Update method>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDS02%20-%20LoRaWAN%20Door%20Sensor%20User%20Manual/#H7.1Howtoupgradetheimage3F]]
1.2	496
	497
1.5	498	== 7.2 How to change the LoRa Frequency Bands/Region? ==
1.2	499
40.2	500
24.7	501	If user has for example US915 frequency and want to change it to AS923 frequency. User can follow the introduction for [[how to upgrade image>>\|\|anchor="H7.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1.2	502
	503
1.5	504	== 7.3 Can I disable uplink for each event to save battery life? ==
	505
40.2	506
1.2	507	Yes, User can use below method to disable this:
	508
	509
40.2	510	(% style="color:blue" %)via AT Command:
1.2	511
40.3	512	(% style="color:red" %)AT+DISALARM=1(%%), End node will only send packet in TDC time.
1.2	513
40.3	514	(% style="color:red" %)AT+DISALARM=0(%%), End node will send packet in TDC time or status change for door sensor.
33.9	515
1.2	516
40.2	517	(% style="color:blue" %)via LoRaWAN downlink Command:
1.2	518
40.3	519	(% style="color:red" %)0xA701 (%%): Equal to AT+DISALARM=1
1.2	520
40.3	521	(% style="color:red" %)0xA700 (%%): Equal to AT+DISALARM=0
1.2	522
40.2	523
53.1	524	== 7.4 How to change Sub-Band for LWL02? ==
40.2	525
53.1	526
56.2	527	(% style="color:blue" %)Before v1.6 firmware(%%): LWL02 works in Subband 2 by default in AU915 / US915 band. So if the LoRaWAN server works in other subband, there will be issue for LWL02 to Join the server. In this case, User can use AT COmmand to change the subband. See AT Command chapther for the hardware connection. Below are the steps to change sub-band:
	528
	529	* Press rest button.
	530	* Send (% style="color:#037691" %)123456(%%) password
	531	* Send command (% style="color:#037691" %)AT+CFREQBANDMASK=0001 (%%)( 0001 for subband 1, 0002 for subband 2, etc..)
	532	* Press rest button to restart to new subband
	533	* Example output:
	534
54.1	535	(% class="mark small" %)[3369]DRAGINO LWL01 Device
	536	[3370]Frequency Band: US915 v1.5
	537	[3373]OTAA
	538	[3374]DevEui= 7896785455246354
	539	[3377]class type A
55.1	540	[3379]freq mode intra(%%)
	541	(% class="mark mark small small" %)[3381]scan chn mask 0x0002 ~-~-> use subband 2
53.1	542
54.1	543	(% class="mark small" %)LM502:~~# [10793]txDone
55.1	544	123456 ~-~-> ENTER PASSWORD
	545	Correct Password
53.1	546
54.1	547	(% class="mark small" %)[105115]rxTimeOut
55.1	548	AT+CFREQBANDMASK=0001 ~-~-> Change to Subband1
	549	OK
53.1	550
54.1	551	(% class="mark small" %)[3371]DRAGINO LWL01 Device
55.1	552	[3373]Frequency Band: US915 v1.5
	553	[3376]OTAA
	554	[3377]DevEui= 7896785455246354
	555	[3380]class type A
	556	[3382]freq mode intra
	557	[3384]scan chn mask 0x0001 ~-~-> reboot and works on Subband1 now
54.1	558
	559
56.2	560	(% style="color:blue" %)Since firmware v1.6: (%%)LWL02 works in chn mask 0x0000. where cover all subbands. so no need to use AT Commands to change subband and it can works for every subband.
54.1	561
	562
56.1	563	== 7.5 My sensor works for Helium AU915 before but not it doesn't work, Why? ==
55.1	564
56.2	565
56.1	566	It is sub-band issue, See chapter 7.4.Helium Change the Subband for AU915 from subband2 to Subband1 which cause the sensor doesn't work.
	567
	568
61.2	569	== 7.6 Why i see different working temperature for the device? ==
	570
	571
	572	The working temperature range of device depends on the battery user choose.
	573
	574	* Normal AAA Battery can support -10 ~~ 50°C working range.
	575	* Special AAA battery can support -40 ~~ 60 °C working range. For example: [[Energizer L92>>url:https://data.energizer.com/pdfs/l92.pdf]]
	576
1.5	577	= 8. Order Info =
1.2	578
40.2	579
1.6	580	Part Number: (% style="color:blue" %)LWL02-XXX(%%)
1.2	581
1.6	582	(% style="color:blue" %)XXX:
1.2	583
1.10	584	* (% style="color:red" %)EU433(%%): frequency bands EU433
	585	* (% style="color:red" %)EU868(%%): frequency bands EU868
	586	* (% style="color:red" %)KR920(%%): frequency bands KR920
1.6	587	* (% style="color:red" %)CN470(%%): frequency bands CN470
1.10	588	* (% style="color:red" %)AS923(%%): frequency bands AS923
1.6	589	* (% style="color:red" %)AU915(%%): frequency bands AU915
1.10	590	* (% style="color:red" %)US915(%%): frequency bands US915
	591	* (% style="color:red" %)IN865(%%): frequency bands IN865
1.6	592	* (% style="color:red" %)CN779(%%): frequency bands CN779
1.2	593
1.4	594	= 9. Packing Info =
	595
40.2	596
1.2	597	Package Includes:
	598
	599	* LWL02 x 1
	600
31.2	601	= 10. Support =
1.2	602
40.2	603
1.2	604	* Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.
	605	* Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]].
56.2	606
58.3	607

Wiki source code of LWL02 -- LoRaWAN Water Leak Sensor User Manual

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