Changes for page MQTT Forward Instruction

Last modified by Kilight Cao on 2024/08/31 16:26
<
From version < 44.1 >
edited by Kilight Cao
on 2022/06/13 19:35
To version < 45.1 >
edited by Xiaoling
on 2022/07/14 15:59
>
Change comment: Uploaded new attachment "image-20220714155901-1.png", version {1}

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1 -XWiki.Kilight
1 +XWiki.Xiaoling
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1 -**~ Contents：**
1 +**~ Table of Contents：**
2 2  
3 3  {{toc/}}
4 4  
5 5  
6 -= 1. Introduction =
6 += 1.  Introduction =
7 7  
8 +
8 8  Dragino LoRa/LoRaWAN gateway support MQTT forwarding. It can forward the sensor data from LoRa network to MQTT server , and vice verse.
9 9  
10 10  
11 -== 1.1 Support Devices ==
12 +== 1.1  Support Devices ==
12 12  
14 +
13 13  This MQTT forward instruction is for below devices:
14 14  
15 15  * Firmware Version > LG02_LG08-5.3.1580178039 [[Firmware Download>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LPS8/Firmware/Release/]]
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21 21  * MS14 series if installed with the same firmware. (in this case, the MQTT forward will work , but no LoRa support)
22 22  
23 23  
24 -= 2. Firmware Change Log for MQTT feature =
25 25  
27 += 2.  Firmware Change Log for MQTT feature =
28 +
29 +
26 26  (((
27 27  This instruction is wrote start from LG02_LG08-5.3.1580178039. Below is related change log since this version of firmware.
28 28  )))
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31 31  ** Initiate version
32 32  
33 33  
34 -= 3. MQTT forward operating principle =
35 35  
36 -== 3.1 Network Structure ==
39 += 3.  MQTT forward operating principle =
37 37  
41 +
42 +== 3.1  Network Structure ==
43 +
44 +
38 38  Below shows the network structure for MQTT forwarding.
39 39  
40 -* 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.
41 -* 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,
47 +* **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.
48 +* **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,
42 42  
43 43  [[image:image-20220527133547-1.png]]
44 44  
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45 45  General MQTT structure
46 46  
47 47  
48 -== 3.2 How sensor data is forwarded ==
55 +== 3.2  How sensor data is forwarded ==
49 49  
57 +
50 50  In this MQTT forward feature, the key point is how the gateway process the sensor data.
51 51  
52 52  
53 -=== 3.2.1 Upstream ===
61 +=== 3.2.1  Upstream ===
54 54  
55 55  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.
56 56  
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62 62  
63 63  (((
64 64  Upstream path
73 +
74 +
65 65  )))
66 66  
67 67  (((
68 -Note: The sensor data can base or LoRa or other method, as long as there are data on the file /var/iot/channels. /span>
78 +(% style="color:red" %)**Note: The sensor data can base or LoRa or other method, as long as there are data on the file /var/iot/channels. /span>**
69 69  )))
70 70  
71 71  (((
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72 72  
73 73  )))
74 74  
75 -=== 3.2.2 Downstream ===
85 +=== 3.2.2  Downstream ===
76 76  
87 +
77 77  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.
78 78  
79 79  (((
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85 85  Downstream path
86 86  
87 87  
88 -== 3.3 Macro Definition ==
99 +== 3.3  Macro Definition ==
89 89  
101 +
90 90  The MQTT publish command use Macro settings to generate flexible upstream payload for MQTT publish.
91 91  
92 92  (((
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95 95  
96 96  )))
97 97  
98 -=== 3.3.1 -t topic macro ===
110 +=== 3.3.1  -t topic macro ===
99 99  
112 +
100 100  * CHANNEL: Remote Channel ID
101 101  * CLIENTID: Client ID , Same as -i
102 102  * WRITE_API: Remote Channel Write API
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104 104  * HOSTNAME: Device Hostname
105 105  
106 106  
107 -=== 3.3.2 -m message macro ===
108 108  
121 +
122 +=== 3.3.2  -m message macro ===
123 +
124 +
109 109  * HOSTNAME: Device Hostname
110 110  * CHANNEL: Remote Channel ID
111 111  * DATA: Sensor Data without time stamp and rssi
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113 113  * JSON: Convert META to json format.
114 114  
115 115  
116 -=== 3.3.3 Example for Macro ===
117 117  
133 +
134 +=== 3.3.3  Example for Macro ===
135 +
136 +
118 118  [[image:image-20220527134251-4.png]]
119 119  
120 120  MQTT Publish configure
121 121  
122 122  
123 -Above screen shots shows below format:
142 +**Above screen shots shows below format:**
124 124  
125 125  * -t: CLIENTID/CHANNEL/data
126 126  * -m: DATA
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137 137  )))
138 138  
139 139  
140 -== 3.4 Modify the MQTT to support more options ==
141 141  
160 +== 3.4  Modify the MQTT to support more options ==
161 +
162 +
142 142  The MQTT Client Utility used in Dragino is **mosquitto_pub** and **mosquitto_sub**. User can add more options to the mqtt commands. User can check the valid options by command mosquitto_pub ~-~-help. as below:
143 143  
144 144  (% class="box" %)
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156 156   [-u username [-P password]]
157 157   [~-~-will-topic [~-~-will-payload payload] [~-~-will-qos qos] [~-~-will-retain]]
158 158   [{~-~-cafile file | ~-~-capath dir} [~-~-cert file] [~-~-key file]
159 - [~-~-ciphers ciphers] [~-~-insecure]
160 - [~-~-tls-alpn protocol]
161 - [~-~-tls-engine engine] [~-~-keyform keyform] [~-~-tls-engine-kpass-sha1]]
180 + [~-~-ciphers ciphers] [~-~-insecure]
181 + [~-~-tls-alpn protocol]
182 + [~-~-tls-engine engine] [~-~-keyform keyform] [~-~-tls-engine-kpass-sha1]]
162 162   [~-~-psk hex-key ~-~-psk-identity identity [~-~-ciphers ciphers]]
163 163   [~-~-proxy socks-url]
164 164   [~-~-property command identifier value]
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263 263  )))
264 264  
265 265  
266 -= 4. Example to communicate to a simple MQTT server =
267 267  
268 -== 4.1 Overview ==
288 += 4.  Example to communicate to a simple MQTT server =
269 269  
290 +
291 +== 4.1  Overview ==
292 +
293 +
270 270  This section is an example to show how to set up LG01-N to communicate with a MQTT server. The MQTT server is a simple utility set up in a local PC. Note: User can set up same server via [[this instruction>>url:http://www.steves-internet-guide.com/install-mosquitto-broker/]].
271 271  
272 272  
273 -== 4.2 Simulate via MQTT.fx utility ==
297 +== 4.2  Simulate via MQTT.fx utility ==
274 274  
299 +
275 275  The [[MQTT.fx>>url:http://mqttfx.jensd.de/index.php/download]] is a MQTT client tool. We can use this to simulate a MQTT connection to our MQTT broker first to make sure the MQTT broker works. This will also help us understand how it works.
276 276  
277 277  (((
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297 297  Downstream: Subscribe a topic to get downstream
298 298  
299 299  
300 -== 4.3 Simulate via Dragino Command Line ==
301 301  
326 +== 4.3  Simulate via Dragino Command Line ==
327 +
302 302  For first try of MQTT connection, simulate via command line is recommend, there are many servers / connection type for MQTT. They are using different connection parameters. Simulating the connection via command line will help us rapidly connect to server and debug.
303 303  
304 304  In the Dragino Gateway, we use [[mosquitto client>>url:https://mosquitto.org/]] for MQTT connection.
305 305  
306 306  
307 -(% style="color:#4f81bd" %)**For Upstream**
333 +(% style="color:blue" %)**For Upstream**
308 308  
309 309  command is [[mosquitto_pub>>url:https://mosquitto.org/man/mosquitto_pub-1.html]]
310 310  
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317 317  mosquitto_pub
318 318  
319 319  
320 -(% style="color:#4f81bd" %)**For Downstream**
321 321  
347 +(% style="color:blue" %)**For Downstream**
348 +
322 322  Use [[mosquitto_sub>>url:https://mosquitto.org/man/mosquitto_sub-1.html]] to subscribe the change on the topic.
323 323  
324 324  [[image:image-20220527135440-10.png]]
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