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1		-Contents:
	1	+**Table of Contents:**
2	2
	3	+{{toc/}}
3	3
	5	+
	6	+
4	4	= 1. Introduction =
5	5
	9	+
6	6	The Dragino LoRaWAN gateway can commuicate with LoRaWAN ABP End Node without the need of LoRaWAN server. It can be used in some cases such as:
7	7
8	8	* No internet connection.
9		-* User wants to get data forward in gateway and forward to their server base on MQTT/HTTP, etc. (Combine ABP communication method and [[MQTT forward together>>url:https://wiki.dragino.com/index.php/MQTT_Forward_Instruction]]).
10	10
	14	+* User wants to get data forward in gateway and forward to their server base on MQTT/HTTP, etc. (Combine ABP communication method and [[MQTT forward together>>MQTT Forward Instruction]]).
11	11
12		-The basic of this feature is the decoding of LoRaWAN ABP End Node. Requirements:
	16	+(((
	17	+The basic of this feature is the decoding of (% style="color:red" %)**LoRaWAN ABP End Node**(%%). Requirements:
	18	+)))
13	13
14		-1. LoRaWAN End Node in ABP mode. Make sure your end node works in this mode. End node most are default set to OTAA mode
15		-1. LoRaWAN Gateway model: [[LPS8>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/148-lps8.html]], [[LG308>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/140-lg308.html]], [[DLOS8>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/160-dlos8.html]] ,[[LIG16>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/171-lig16.html]]
16		-1. Firmware version for below instruction:[[Since LG02_LG08~~-~~-build-v5.4.1593400722-20200629-1120>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/Release/]]
	20	+* LoRaWAN End Node in ABP mode. Make sure your end node works in this mode. End node most are default set to OTAA mode
17	17
	22	+* LoRaWAN Gateway model: [[LPS8>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/148-lps8.html]], [[LG308>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/140-lg308.html]], [[DLOS8>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/160-dlos8.html]] ,[[LIG16>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/171-lig16.html]]
18	18
	24	+* Firmware version for below instruction:  **[[(% style="color:purple" %)Since LG02_LG08~~-~~-build-v5.4.1593400722-20200629-1120>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/Release/]](%%)**
	25	+
	26	+
	27	+
19	19	= 2. How it works =
20	20
21	21
22		-Video Instruction: [[https:~~/~~/youtu.be/ZBjXwmp7rwM>>url:https://youtu.be/ZBjXwmp7rwM]]
	31	+(% style="color:#037691" %)**Video Instruction**(%%): **[[https:~~/~~/youtu.be/ZBjXwmp7rwM>>url:https://youtu.be/ZBjXwmp7rwM]]**
23	23
	33	+
24	24	Assume we have the LoRaWAN tracker LGT92 which works in ABP mode and US915 band. It has below keys:
25	25
26		-{{{AT+NWKSKEY=72 32 63 95 dd 8f e2 b2 13 66 e4 35 93 8f 55 df
	36	+(% class="box infomessage" %)
	37	+(((
	38	+**AT+NWKSKEY=72 32 63 95 dd 8f e2 b2 13 66 e4 35 93 8f 55 df
27	27	AT+APPSKEY=b3 17 f8 14 7a 43 27 8a 6a 31 c4 47 3d 55 5d 33
28		-AT+DADDR=2602111D
29		-}}}
	40	+AT+DADDR=2602111D**
	41	+)))
30	30
	43	+(((
31	31	and we have the LG308 works and US915 band and support ABP decryption. User can input these keys in LG308 so the LG308 can communicate with LGT92.
32	32
	46	+
	47	+)))
	48	+
33	33	We need to input above keys in LG308 and enable ABP decryption.
34	34
35		-[[image:https://wiki.dragino.com/images/thumb/5/55/LG308_MQTT_1.png/600px-LG308_MQTT_1.png||height="329" width="600"]]
36	36
	52	+[[image:image-20220527161119-1.png]]
	53	+
	54	+
37	37	Input the ABP keys in LG308
38	38
39	39
40	40	== 2.1 Upstream ==
41	41
	60	+
42	42	Now when this End Node (Dev Addr=2602111D) send a uplink packet. When this packet arrive LG308, LG308 will decode it and put the decode data on the file /var/iot/channels/2602111D . So we have this data for further process with other applications in LG308.
43	43
44		-We can see the log of LG308 to know this packet arrive
	63	+(((
	64	+We can see the log of LG308 to know this packet arrive.
45	45
46		-[[image:https://wiki.dragino.com/images/thumb/1/16/ABP_DECODE_2.png/600px-ABP_DECODE_2.png||height="205" width="600"]]
	66	+
	67	+)))
47	47
48		-LG308 log by "logread -f" command
	69	+[[image:image-20220527161149-2.png]]
49	49
50	50
	72	+LG308 log by "(% style="color:red" %)**logread -f**" (%%)command
	73	+
	74	+
	75	+
51	51	The data of End Node is stored in the file /var/iot/channels/2602111D. We can use hexdump command to check it.
52	52
53		-{{{root@dragino-1d25dc:~# hexdump /var/iot/channels/2602111D
54		-0000000 4646 4646 4646 3946 3030 3030 3030 3546 --> Got RSSI and SNR
55		-0000010 cc0c 0b63 0266 017f ff7f ff00 --> Payload
	78	+(% class="box" %)
	79	+(((
	80	+root@dragino-1d25dc:~~# hexdump /var/iot/channels/2602111D
	81	+0000000 (% style="color:#037691" %)**4646 4646 4646 3946 3030 3030 3030 3546**(%%)      ~-~-> Got RSSI and SNR
	82	+0000010 (% style="color:#037691" %)**cc0c 0b63 0266 017f ff7f ff00 **(%%) ~-~-> Payload
56	56	000001c
57		-}}}
	84	+)))
58	58
59		-* RSSI: 4646 4646 4646 3946 = 0xFFFF FF9F : So RSSI = (0xFFFF FF9F - 0x100000000) = -97
60		-* SNR: 3030 3030 3030 3546 = 0x0000 005F = 95, need to divide 10 so SNR is 9.5
61		-* Payload: 0xcc0c 0b63 0266 017f ff7f ff00
	86	+* **RSSI**: 4646 4646 4646 3946 = 0xFFFF FF9F : So RSSI = (0xFFFF FF9F - 0x100000000) = -97
62	62
	88	+* **SNR**: 3030 3030 3030 3546 = 0x0000 005F = 95, need to divide 10 so SNR is 9.5
63	63
64		-{{{Notice 1: The data file stored in LG308 for the end node is bin file. If the end node sends ASCII string to gateway, the output will as below:
65		-in LGT92, use AT+SEND=12:hello world to send ASCII string
66		-root@dragino-1d25dc:~# hexdump /var/iot/channels/2602111D
	90	+* **Payload**: 0xcc0c 0b63 0266 017f ff7f ff00
	91	+
	92	+(% class="box" %)
	93	+(((
	94	+(% style="color:red" %)**Notice 1**(%%): The data file stored in LG308 for the end node is bin file. If the end node sends ASCII string to gateway, the output will as below:
	95	+in LGT92, use (% style="color:#037691" %)**AT+SEND=12:hello world** (%%)to send ASCII string
	96	+root@dragino-1d25dc:~~# hexdump /var/iot/channels/2602111D
67	67	0000000 4646 4646 4646 3946 3030 3030 3030 3546
68		-0000010 6865 6c6c 6f20 776f 726c 6400 --> Got ASCII code "hello world"
	98	+0000010 6865 6c6c 6f20 776f 726c 6400      ~-~-> Got ASCII code "hello world"
69	69	000001c
70		-}}}
	100	+)))
71	71
72		-{{{Notice 2: The upstream payload length should match the LoRaWAN length requirement (max length depends on Frequency and DR), otherwise the gateway can't decode the payload.
73		-}}}
74	74
	103	+(% class="box" %)
	104	+(((
	105	+(% style="color:red" %)**Notice 2**(%%): The upstream payload length should match the LoRaWAN length requirement (max length depends on Frequency and DR), otherwise the gateway can't decode the payload.
	106	+)))
	107	+
	108	+
75	75	=== 2.2.1 Decode Method ===
76	76
77		-The decode methods: ASCII String, Decode_LHT65 doesn't affect how the sensor data is stored, they are to define how should the sensor data to be sent.
78	78
	112	+The decode methods: (% style="color:#037691" %)**ASCII String, Decode_LHT65**(%%) doesn't affect how the sensor data is stored, they are to define how should the sensor data to be sent.
	113	+
79	79	For example we have a LHT65 , works in ABP mode and gateway successful get the data, which are:
80	80
81		-{{{root@dragino-1baf44:~# hexdump /var/iot/channels/01826108
	116	+(% class="box" %)
	117	+(((
	118	+root@dragino-1baf44:~~# hexdump /var/iot/channels/01826108
82	82	0000000 4646 4646 4646 4537 3030 3030 3030 3438
83		-0000010 ccd1 7fff 7fff 017f ff7f ff00
	120	+0000010 ccd1 7fff 7fff 017f ff7f ff00
84	84	000001c
85		-}}}
	122	+)))
86	86
	124	+
87	87	If we choose ASCII decoder, the MQTT process will send out with mqtt-data:
88	88
89		-{{{Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
	127	+(% class="box" %)
	128	+(((
	129	+Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
90	90	Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:decoder: ASCII
91		-Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:mqtt_data[-m]: ffffffe700000048ccd17fff7fff017fff7fff00
92		-}}}
	131	+Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:mqtt_data[-m]: (% style="color:#037691" %)**ffffffe700000048ccd17fff7fff017fff7fff00**
	132	+)))
93	93
	134	+
94	94	If we choose Decode_LHT65, the MQTT process will send out with mqtt-data
95	95
96		-{{{Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
	137	+(% class="box" %)
	138	+(((
	139	+Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
97	97	Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:decoder: Dragino_LHT65
98		-Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:mqtt_data[-m]: {"Hum_SHT":32.7,"BatV":3.281,"TempC_DS":32.9,
99		-"EXT":"Temperature Sensor","RSSI":-24,"TempC_SHT":85.0,"SNR":8.2,"ext_sensor":0}
100		-}}}
	141	+Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:mqtt_data[-m]:** (% style="color:#037691" %){"Hum_SHT":32.7,"BatV":3.281,"TempC_DS":32.9,
	142	+"EXT":"Temperature Sensor","RSSI":-24,"TempC_SHT":85.0,"SNR":8.2,"ext_sensor":0}(%%)**
	143	+)))
101	101
102	102	Above scripts are store in /etc/lora/decoder/. User can put their scripts here and select it in the UI.
103	103
...	...	@@ -104,94 +104,130 @@
104	104
105	105	=== 2.2.2 How to Decode My End Node ===
106	106
107		-1/ Configure the ABP keys for your end node in the gateway. enable ABP decode in Web UI
108	108
109		-2/ Don't choose MQTT service, use LoRaWAN.
	151	+**1.** Configure the ABP keys for your end node in the gateway. enable ABP decode in Web UI
110	110
111		-3/ When your end node send a message to the gateway, there will be a file store in /var/iot/channels. full path should be /var/iot/channels/END_NODE_DEV_ADDR
	153	+**2. **Don't choose MQTT service, use LoRaWAN.
112	112
113		-4/ Use the /etc/lora/decoder/Dragino_LHT65 as template to decode your payload. This script is written in Lua language. User can manually call this script when you see the data file in /var/iot/channels by running:
	155	+**3.** When your end node send a message to the gateway, there will be a file store in /var/iot/channels. full path should be /var/iot/channels/END_NODE_DEV_ADDR
114	114
	157	+**4.** Use the /etc/lora/decoder/Dragino_LHT65 as template to decode your payload. This script is written in Lua language. User can manually call this script when you see the data file in /var/iot/channels by running:
	158	+
115	115	{{{/etc/lora/decoder/Dragino_LHT65 END_NODE_DEV_ADDR
116	116	}}}
117	117
118		-5/ What you see as output is the MQTT data device will upload, user's end node has different payload compare with LHT65, most properly this file will report with error. User need to modify to match the actual payload. Some notice:
	162	+**5.** What you see as output is the MQTT data device will upload, user's end node has different payload compare with LHT65, most properly this file will report with error. User need to modify to match the actual payload.
119	119
	164	+
	165	+(% style="color:red" %)
	166	+**Some notice:**
	167	+
120	120	* RSSI and SNR are added when gateway receive the packet, so there is always this field.
	169	+
121	121	* If you rename the file, please make it executable.
	171	+
122	122	* See this link for lua.bit module: [[http:~~/~~/luaforge.net/projects/bit/>>url:http://luaforge.net/projects/bit/]]
	173	+
123	123	* Lua json module: [[http:~~/~~/json.luaforge.net/>>url:http://json.luaforge.net/]]
	175	+
124	124	* the last line return is what will be used for MQTT
	177	+
125	125	* User can use other language ,not limited to Lua, just make sure the return is what you want to send.
126	126
	180	+
	181	+
127	127	== 2.2 Downstream ==
128	128
	184	+
129	129	In LG308, we can create a file in the directory /var/iot/push for downstream purpose. We recommend using each command to generate this file. This file will be used for transmission and auto-deleted after used
130	130
131	131	The file should use below format:
132	132
	189	+(% style="color:#037691" %)**dev_addr,imme/time,txt/hex,payload**
133	133
134		-dev_addr,imme/time,txt/hex,payload
135	135
136		-Since fimware > Dragino-v2 lgw-5.4.1608518541 . Support more option
	192	+Since fimware > [[Dragino lgw~~-~~-build-v5.4.1668567157>>https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LG308-LG301/Firmware/Release/]] . Support more option
137	137
138		-dev_addr,imme/time,txt/hex,payload,txpw,txbw,SF,frequency,rxwindow
	194	+(% style="color:#037691" %)**dev_addr,imme/time,txt/hex,payload,txpw,txbw,SF,frequency,rxwindow,Fport**
139	139
140		-* dev_addr: Inptu the device address
141		-* imme/time:
	196	+* **dev_addr:** Inptu the device address
	197	+
	198	+* **imme/time:**
142	142	** imme: send downstream immediately,For Class C end node.
143	143	** time: send downstream after receive device's uplink. For Class A end node
144		-* txt/hex:
	201	+
	202	+* **txt/hex:**
145	145	** txt: send payload in ASCII
146	146	** hex: send payload in HEX
147		-* payload: payload to be sent, payload lenght should match the LoRaWAN protocol requirement.
148		-* txpw: Transmit Power. example: 20
149		-* txbw: bandwidth:
	205	+
	206	+* **payload: **payload to be sent, payload lenght should match the LoRaWAN protocol requirement.
	207	+
	208	+* **txpw:** Transmit Power. example: 20
	209	+
	210	+* **txbw:** bandwidth:
150	150	** 1: 500 kHz
151	151	** 2: 250 kHz
152	152	** 3: 125 kHz
153	153	** 4: 62.5 kHz
154		-* SF: Spreading Factor : SF7/SF8/SF9/SF10/SF11/SF12
155		-* Frequency: Transmit Frequency: example: 923300000
156		-* rxwindow: transmit on Rx1Window or Rx2Window.
	215	+* **SF:** Spreading Factor : SF7/SF8/SF9/SF10/SF11/SF12
157	157
	217	+* **Frequency:** Transmit Frequency: example: 923300000
158	158
159		-Completely exmaple:
	219	+* **rxwindow:** transmit on Rx1Window or Rx2Window.
160	160
161		-* Old version: echo 018193F4,imme,hex,0101 > /var/iot/push/test
162		-* New version: echo 018193F4,imme,hex,0101,20,1,SF12,923300000,2 > /var/iot/push/test
	221	+* **Fport: **Transmit port,example:8
163	163
164	164
165		-Downstream Frequency
	224	+(% style="color:blue" %)**Completely exmaple:**
166	166
	226	+* **Old version:** echo 018193F4,imme,hex,0101 > /var/iot/push/test
	227	+
	228	+* **New version:** echo 018193F4,imme,hex,0101,20,1,SF12,923300000,2,8 > /var/iot/push/test
	229	+
	230	+
	231	+Downstream(% style="color:#037691" %)** Frequency:**
	232	+
167	167	The LG308 will use the RX2 window info to send the downstream payload, use the default LoRaWAN settings, as below:
168	168
169	169	* EU868: 869.525Mhz, DR0(SF12BW125)
	236	+
170	170	* US915: 923.3Mhz, SF12 BW500
	238	+
171	171	* CN470: 505.3Mhz, SF12 BW125
	240	+
172	172	* AU915: 923.3Mhz, SF12 BW500
	242	+
173	173	* AS923: 923.2Mhz, SF10 BW125
	244	+
174	174	* KR920: 921.9Mhz, SF12 BW125
	246	+
175	175	* IN865: 866.55Mhz, SF10 BW125
	248	+
176	176	* RU864: 869.1Mhz, SF12 BW125
177	177
178	178
179		-Examples:
180	180
181		-{{{we can use echo command to create files in LG308 for downstream.
182		-root@dragino-1d25dc:~# echo 2602111D,time,hex,12345678 > /var/iot/push/test
	253	+(% style="color:#037691" %)**Examples:**
183	183
184		-1) From logread -f of gateway, we can see it has been added as pedning.
185		-lora_pkt_fwd[4286]: INFO~ [DNLK]Looking file : test
186		-lora_pkt_fwd[4286]: INFO~ [DNLK]devaddr:2602111D, txmode:time, pdfm:hex, size:4, payload1:4Vx,payload_hex:77C1BB90
187		-lora_pkt_fwd[4286]: INFO~ [DNLK] DNLINK PENDING!(1 elems).
	255	+(% class="box" %)
	256	+(((
	257	+we can use echo command to create files in LG308 for downstream.
	258	+root@dragino-1d25dc:~~# echo 2602111D,time,hex,12345678 > /var/iot/push/test
188	188
189		-2) When there is an upstrea from end node, this downstream will be sent and shows:
	260	+
	261	+**1)** From logread -f of gateway, we can see it has been added as pedning.
	262	+lora_pkt_fwd[4286]: INFO~~ [DNLK]Looking file : test
	263	+lora_pkt_fwd[4286]: INFO~~ [DNLK]devaddr:2602111D, txmode:time, pdfm:hex, size:4, payload1:4Vx,payload_hex:77C1BB90
	264	+lora_pkt_fwd[4286]: INFO~~ [DNLK] DNLINK PENDING!(1 elems).
	265	+
	266	+
	267	+**2)** When there is an upstrea from end node, this downstream will be sent and shows:
190	190	lora_pkt_fwd[4286]: INFO: tx_start_delay=1497 (1497.000000) - (1497, bw_delay=0.000000, notch_delay=0.000000)
191	191	lora_pkt_fwd[4286]: [LGWSEND]lgw_send done: count_us=3537314420, freq=923300000, size=17
192	192
193		-3) and the end node will got:
194		-[5764825]***** UpLinkCounter= 98 *****
	271	+
	272	+**3)** and the end node will got:
	273	+[5764825]~*~*~*~** UpLinkCounter= 98 ~*~*~*~**
195	195	[5764827]TX on freq 905300000 Hz at DR 0
196	196	Update Interval: 60000 ms
197	197	[5765202]txDone
...	...	@@ -201,11 +201,11 @@
201	201	[5767501]rxDone
202	202	Rssi= -41
203	203	Receive data
204		-2:12345678 --> Hex
205		-}}}
	283	+(% style="color:#037691" %)**2:12345678**  (%%) ~-~-> Hex
206	206
207		-{{{4) If we use the command "echo 2602111D,time,txt,12345678 > /var/iot/push/test" for downstream, the end node will got:
208		-[5955877]***** UpLinkCounter= 102 *****
	285	+
	286	+**4) **If we use the command "echo 2602111D,time,txt,12345678 > /var/iot/push/test" for downstream, the end node will got:
	287	+[5955877]~*~*~*~** UpLinkCounter= 102 ~*~*~*~**
209	209	[5955879]TX on freq 904100000 Hz at DR 0
210	210	Update Interval: 60000 ms
211	211	[5956254]txDone
...	...	@@ -215,114 +215,142 @@
215	215	[5958595]rxDone
216	216	Rssi= -37
217	217	Receive data
218		-2:3132333435363738 --> ASCII string "12345678"
219		-}}}
	297	+(% style="color:#037691" %)**2:3132333435363738**(%%) ~-~-> ASCII string "12345678"
	298	+)))
220	220
	300	+
221	221	= 3. Example 1: Communicate with LT-22222-L =
222	222
	303	+
223	223	Script can be download from: [[Example Script 1>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/customized_script/&file=talk_to_lt-22222-l_v0.1.sh]]
224	224
225		-{{{#!/bin/sh
	306	+(% class="box" %)
	307	+(((
	308	+//#!/bin/sh
226	226	# This scripts shows how to use LPS8/LG308/DLOS8 to communicate with two LoRaWAN End Nodes, without the use of internet or LoRaWAN server
227	227	#
228		-# Hardware Prepare:
229		-# 1. LT-22222-L x 2, both are configured to work in
230		-# a) Class C ;
231		-# b) ABP Mode ;
	311	+# Hardware Prepare:
	312	+# 1. LT-22222-L x 2, both are configured to work in
	313	+#   a) Class C ;
	314	+# b) ABP Mode ;
232	232	# c) AT+Mod=1
233		-# 2. LPS8,
234		-# a) Firmware version >
235		-# b) Input the LT-22222-L keys in LPS so LPS8 can talk with them.
236		-# c) Lorawan server choose built-in
237		-# d) in Custom page, select custom script to point to this script. (put this script in /etc/iot/scripts directory)
238		-#
239		-# How it works?
240		-# a) Devices 1 sends a uplink payload to LPS8. LPS8 will get the DI1 and DI2 info from the payload
241		-# b) LPS8 will send a message to Device 2 to set the Device2 DO1 = Device1 DI1, and Device DO2 = Device DI2.
242		-# c) Device2 will change DO1 and DO2 to according to the message from LPS8, and send back a message to LPS8 with the its DO1
243		-# and DO2 value. LPS8 will ask Device1 to change its DO1 to same as Device 2, and change the DO2 to the same as Device 2.
244		-# ( The purpose of this step is to show that the Device2 has already do the change there).
245		-#
246		-# For example: If current status of Device1 and Device2 leds shows:
247		-# Device1: DI1: ON, DI2: ON , DO1: OFF, DO2: OFF
248		-# Device2: DI1: OFF, DI2: OFF , DO1: OFF, DO2: OFF
	316	+# 2. LPS8,
	317	+#   a) Firmware version >
	318	+#   b) Input the LT-22222-L keys in LPS so LPS8 can talk with them.
	319	+#   c) Lorawan server choose built-in
	320	+#   d) in Custom page, select custom script to point to this script. (put this script in /etc/iot/scripts directory)
249	249	#
250		-# Step2 will cause below change:
251		-# Device1: DI1: ON, DI2: ON , DO1: OFF, DO2: OFF
252		-# Device2: DI1: OFF, DI2: OFF , DO1: ON, DO2: ON
253		-#
254		-# Step3 will cause below change:
255		-# Device1: DI1: ON, DI2: ON , DO1: ON, DO2: ON
256		-# Device2: DI1: OFF, DI2: OFF , DO1: ON, DO2: ON
257		-# So if a person is in the Device 1 location, he can check if the DO LED match DI LEDs on Device 1 to confirm
258		-# whether the Device 2 has been changed.}}}
	322	+# How it works?
	323	+#   a) Devices 1 sends a uplink payload to LPS8. LPS8 will get the DI1 and DI2 info from the payload
	324	+#   b) LPS8 will send a message to Device 2 to set the Device2 DO1 = Device1 DI1, and Device DO2 = Device DI2.
	325	+#   c) Device2 will change DO1 and DO2 to according to the message from LPS8, and send back a message to LPS8 with the its DO1
	326	+#   and DO2 value. LPS8 will ask Device1 to change its DO1 to same as Device 2, and change the DO2 to the same as Device 2.
	327	+#   ( The purpose of this step is to show that the Device2 has already do the change there).
	328	+#
	329	+#  For example: If current status of Device1 and Device2 leds shows:
	330	+#  Device1: DI1: ON, DI2: ON , DO1: OFF,  DO2: OFF
	331	+#  Device2: DI1: OFF, DI2: OFF , DO1: OFF,  DO2: OFF
	332	+#
	333	+#  Step2  will cause below change:
	334	+#  Device1: DI1: ON, DI2: ON , DO1: OFF,  DO2: OFF
	335	+#  Device2: DI1: OFF, DI2: OFF , DO1: ON,  DO2: ON
	336	+#
	337	+#  Step3 will cause below change:
	338	+#  Device1: DI1: ON, DI2: ON , DO1: ON,  DO2: ON
	339	+#  Device2: DI1: OFF, DI2: OFF , DO1: ON,  DO2: ON
	340	+#  So if a person is in the Device 1 location, he can check if the DO LED match DI LEDs on Device 1 to confirm
	341	+#  whether the Device 2 has been changed.//
	342	+)))
259	259
260		-~1. Input keys
261	261
262		-[[image:https://wiki.dragino.com/images/thumb/b/bf/LPS8_LT-22222_1.png/600px-LPS8_LT-22222_1.png||height="335" width="600"]]
	345	+(% style="color:blue" %)**1. Input keys**
263	263
	347	+
	348	+[[image:image-20220527162450-3.png]]
	349	+
264	264	Input Keys in LPS8
265	265
266		-2. Make sure the LPS8 and LT use the same frequency bands, choose EU868 in this test.
267	267
268		-3. Choose Built-in server
269	269
270		-[[image:https://wiki.dragino.com/images/thumb/d/d7/LPS8_LT-22222_2.png/600px-LPS8_LT-22222_2.png||height="264" width="600"]]
	354	+(% style="color:blue" %)**2. Make sure the LPS8 and LT use the same frequency bands, choose EU868 in this test.**
271	271
	356	+
	357	+(% style="color:blue" %)**3. Choose Built-in server**
	358	+
	359	+
	360	+[[image:image-20220527162518-4.png]]
	361	+
272	272	Choose Built-in server
273	273
274		-4. Run the script.
275	275
276		-[[image:https://wiki.dragino.com/images/thumb/3/39/LPS8_LT-22222_3.png/600px-LPS8_LT-22222_3.png||height="389" width="600"]]
277	277
	366	+(% style="color:blue" %)**4. Run the script.**
	367	+
	368	+
	369	+[[image:image-20220722115213-2.png]]
	370	+
278	278	Run the script
279	279
280		-5. Output:
281	281
282		-[[image:https://wiki.dragino.com/images/thumb/f/fe/LPS8_LT-22222_4.png/600px-LPS8_LT-22222_4.png||height="433" width="600"]]
283	283
	375	+(% style="color:blue" %)**5. Output:**
	376	+
	377	+
	378	+[[image:image-20220722115133-1.png]]
	379	+
284	284	Output from LPS8
285	285
286	286
287	287	= 4. Example 2: Communicate to TCP Server =
288	288
289		-[[image:https://wiki.dragino.com/images/thumb/7/75/LPS8_TCP_0.png/600px-LPS8_TCP_0.png||height="370" width="600"]]
290	290
	386	+[[image:image-20220527162648-7.png]]
	387	+
291	291	Network Structure
292	292
293	293
294	294	Full instruction video inlcude how to write scripts to fit server needed is here:
295	295
	393	+(% style="color:#037691" %)**Video Instruction**(%%): **[[https:~~/~~/youtu.be/-nevW6U2TsE>>url:https://youtu.be/-nevW6U2TsE]]**
296	296
297		-Video Instruction: [[https:~~/~~/youtu.be/-nevW6U2TsE>>url:https://youtu.be/-nevW6U2TsE]]
	395	+(% style="display:none" %) (%%)
298	298
	397	+(% style="color:red" %)**Note: Firmware version must be higher than lgw-5.4.1607519907**
299	299
300		-Note: Firmware version must be higher than lgw-5.4.1607519907
301	301
302	302	Assume we already set up ABP keys in the gateway:
303	303
304		-[[image:https://wiki.dragino.com/images/thumb/b/bf/LPS8_LT-22222_1.png/600px-LPS8_LT-22222_1.png||height="335" width="600"]]
	402	+[[image:image-20220527162852-8.png]]
305	305
306	306	Input Keys in LPS8
307	307
308		-run socket tool in PC
309	309
310		-[[image:https://wiki.dragino.com/images/thumb/4/4b/LPS8_TCP_2.png/600px-LPS8_TCP_2.png||height="212" width="600"]]
311	311
	408	+(% style="color:blue" %)**run socket tool in PC**
	409	+
	410	+
	411	+[[image:image-20220527163028-9.png]]
	412	+
	413	+
312	312	Socket tool
313	313
314	314
315		-Input Server address and port
316	316
317		-[[image:https://wiki.dragino.com/images/thumb/c/c6/LPS8_TCP_3.png/600px-LPS8_TCP_3.png||height="306" width="600"]]
	418	+(% style="color:blue" %)**Input Server address and port**
318	318
	420	+
	421	+[[image:image-20220527163106-10.png]]
	422	+
319	319	Input Server address and port
320	320
321	321
322		-See value receive in socket tool. :
323	323
324		-[[image:https://wiki.dragino.com/images/thumb/2/20/LPS8_TCP_4.png/600px-LPS8_TCP_4.png||height="219" width="600"]]
	427	+(% style="color:blue" %)**See value receive in socket tool:**
325	325
	429	+
	430	+[[image:image-20220527163144-11.png||height="502" width="1371"]]
	431	+
326	326	value receive in socket tool
327	327
	434	+
328	328	If user want to modify the TCP connection method. He can refer: [[https:~~/~~/github.com/dragino/dragino-packages/blob/lg02/haserl-ui/root/usr/bin/tcp_process.sh>>url:https://github.com/dragino/dragino-packages/blob/lg02/haserl-ui/root/usr/bin/tcp_process.sh]]. Same script is on /usr/bin of gateway.

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