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1		-**~ Contents：**
	1	+Contents：
2	2
3	3	{{toc/}}
4	4
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12	12	This MQTT forward instruction is for below devices:
13	13
14	14	* Firmware Version > LG02_LG08-5.3.1580178039 [[Firmware Download>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/Release/]]
15		-* LG01N, OLG01N ((% class="mark" %)**Warning**(%%): LG01-P LG01-S use another instruction: [[MQTT for LG01-P/LG01S>>url:https://wiki.dragino.com/index.php/Through_MQTT_to_upload_data]])
	15	+* LG01N, OLG01N (Warning: LG01-P LG01-S use another instruction: [[MQTT for LG01-P/LG01S>>url:https://wiki.dragino.com/index.php/Through_MQTT_to_upload_data]])
16	16	* LG02, OLG02
17	17	* LG308, DLOS8
18	18	* LPS8
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22	22
23	23	= 2. Firmware Change Log for MQTT feature =
24	24
25		-(((
26	26	This instruction is wrote start from LG02_LG08-5.3.1580178039. Below is related change log since this version of firmware.
27		-)))
28	28
29	29	* LG02_LG08-5.3.1580178039
30	30	** Initiate version
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39	39	* For Uplink: The sensor sends data to LoRa Gateway via LoRa wireless, The gateway will process these data and forward to remote MQTT Broker via Internet.
40	40	* For Downlink: The gateway subscribe a topic in the MQTT broker, when there is update on the topic, the gateway will know and broadcast the data to Local LoRa network,
41	41
42		-[[image:https://wiki.dragino.com/images/thumb/4/45/MQTT_Forward_1.png/600px-MQTT_Forward_1.png||height="348" width="600"]]
	40	+[[~[~[image:https://wiki.dragino.com/images/thumb/4/45/MQTT_Forward_1.png/600px-MQTT_Forward_1.png~|~|height="348" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:MQTT_Forward_1.png]]
43	43
44	44	General MQTT structure
45	45
46		-
47	47	== 3.2 How sensor data is forwarded ==
48	48
49	49	In this MQTT forward feature, the key point is how the gateway process the sensor data.
50	50
51		-
52	52	=== 3.2.1 Upstream ===
53	53
54	54	Assume there are two sensor nodes, their ID are Node1 ID: 6734 , Node2 ID: 7456. In the remote MQTT broker there are two topics: Topic1: /channel/765800, Topic2: /channel/367860. We can set up in the gateway to map Node1 to Topic1 and Node2 to Topic2. So when there is a sensor data from Node1, the gateway will forward the data to Topic1, when there is sensor data from Node2, the gateway will forward to Topic2.
55	55
56		-(((
57	57	The data flow works as below diagram.
58		-)))
59	59
60	60	[[~[~[image:https://wiki.dragino.com/images/thumb/2/2a/MQTT_Forward_2.png/600px-MQTT_Forward_2.png~|~|height="355" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:MQTT_Forward_2.png]]
61	61
62		-(((
63	63	Upstream path
64		-)))
65	65
66		-(((
67	67	Note: The sensor data can base or LoRa or other method, as long as there are data on the file /var/iot/channels. /span>
68		-)))
69	69
70		-(((
71		-
72		-)))
73		-
74	74	=== 3.2.2 Downstream ===
75	75
76	76	The gateway subscribes to a topic of the remote MQTT broker topic. When there is some one publish a value on this topic. The gateway will get it and broadcast to local LoRa Network.
77	77
78		-(((
79	79	Below are the data flow for downstream.
80		-)))
81	81
82		-[[image:https://wiki.dragino.com/images/thumb/3/3a/MQTT_Forward_3.png/600px-MQTT_Forward_3.png||height="368" width="600"]]
	66	+[[~[~[image:https://wiki.dragino.com/images/thumb/3/3a/MQTT_Forward_3.png/600px-MQTT_Forward_3.png~|~|height="368" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:MQTT_Forward_3.png]]
83	83
84	84	Downstream path
85	85
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387	387	downstream simulation
388	388
389	389
	374	+\\
390	390
391	391	== 4.5 Add LoRa support to communicate with remote sensor ==
392	392
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429	429	When use test this feature, please use the version higher then : LG02_LG08~-~-build-v5.4.1593400722-20200629-1120, in this version, the upload format is changed and readable, which is easier for integration.
430	430
431	431
432		-
433		-Video Instruction:[[https:~~/~~/youtu.be/qJTY441-t90>>url:https://youtu.be/qJTY441-t90]]
	417	+\\Video Instruction:[[https:~~/~~/youtu.be/qJTY441-t90>>url:https://youtu.be/qJTY441-t90]]
434	434
435	435
436	436	Step 1: Refer [[Communicate with ABP End Node>>url:https://wiki.dragino.com/index.php/Communication_with_ABP_End_Node]] to know how to set up LG308 to work with LoRaWAN End node.
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511	511	[[AWS Examples>>url:https://wiki.dragino.com/index.php/MQTT_Forward_to_Amazon_AWS-IOT]]
512	512	)))
513	513
	498	+
514	514	= 6. How to Debug =
515	515
516	516	User can login the gateway's console and run **logread -f**. It will shows the output when there is packet arrive.User can see if it is correct.