Last modified by Xiaoling on 2023/04/20 18:14
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From version < 1.7 >
edited by Xiaoling
on 2022/05/12 17:54
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... ... @@ -12,7 +12,7 @@
12 12  
13 13  (((
14 14  
15 -The basic of this feature is the decoding of LoRaWAN ABP End Node. Requirements:
15 +The basic of this feature is the decoding of **LoRaWAN ABP End Node**. Requirements:
16 16  )))
17 17  
18 18  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
... ... @@ -23,16 +23,20 @@
23 23  = 2. How it works =
24 24  
25 25  
26 -Video Instruction: [[https:~~/~~/youtu.be/ZBjXwmp7rwM>>url:https://youtu.be/ZBjXwmp7rwM]]
26 +**Video Instruction**: [[https:~~/~~/youtu.be/ZBjXwmp7rwM>>url:https://youtu.be/ZBjXwmp7rwM]]
27 27  
28 28  Assume we have the LoRaWAN tracker LGT92 which works in ABP mode and US915 band. It has below keys:
29 29  
30 -{{{AT+NWKSKEY=72 32 63 95 dd 8f e2 b2 13 66 e4 35 93 8f 55 df
30 +(% class="box infomessage" %)
31 +(((
32 +AT+NWKSKEY=72 32 63 95 dd 8f e2 b2 13 66 e4 35 93 8f 55 df
31 31  AT+APPSKEY=b3 17 f8 14 7a 43 27 8a 6a 31 c4 47 3d 55 5d 33
32 32  AT+DADDR=2602111D
33 -}}}
35 +)))
34 34  
37 +(((
35 35  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.
39 +)))
36 36  
37 37  We need to input above keys in LG308 and enable ABP decryption.
38 38  
... ... @@ -45,7 +45,9 @@
45 45  
46 46  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.
47 47  
52 +(((
48 48  We can see the log of LG308 to know this packet arrive
54 +)))
49 49  
50 50  [[image:https://wiki.dragino.com/images/thumb/1/16/ABP_DECODE_2.png/600px-ABP_DECODE_2.png||height="205" width="600"]]
51 51  
... ... @@ -54,54 +54,65 @@
54 54  
55 55  The data of End Node is stored in the file /var/iot/channels/2602111D. We can use hexdump command to check it.
56 56  
57 -{{{root@dragino-1d25dc:~# hexdump /var/iot/channels/2602111D
58 -0000000 4646 4646 4646 3946 3030 3030 3030 3546 --> Got RSSI and SNR
59 -0000010 cc0c 0b63 0266 017f ff7f ff00 --> Payload
63 +(% class="box" %)
64 +(((
65 +root@dragino-1d25dc:~~# hexdump /var/iot/channels/2602111D
66 +0000000 (% class="mark" %)**4646 4646 4646 3946 3030 3030 3030 3546**(%%)      ~-~-> Got RSSI and SNR    
67 +0000010 (% class="mark" %)**cc0c 0b63 0266 017f ff7f ff00 **(%%) ~-~-> Payload
60 60  000001c
61 -}}}
69 +)))
62 62  
63 63  * RSSI: 4646 4646 4646 3946 = 0xFFFF FF9F : So RSSI = (0xFFFF FF9F - 0x100000000) = -97
64 64  * SNR: 3030 3030 3030 3546 = 0x0000 005F = 95, need to divide 10 so SNR is 9.5
65 65  * Payload: 0xcc0c 0b63 0266 017f ff7f ff00
66 66  
67 -
68 -{{{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:
69 -in LGT92, use AT+SEND=12:hello world to send ASCII string
70 -root@dragino-1d25dc:~# hexdump /var/iot/channels/2602111D
75 +(% class="box" %)
76 +(((
77 +(% class="mark" %)**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:
78 +in LGT92, use **AT+SEND=12**:hello world to send ASCII string
79 +root@dragino-1d25dc:~~# hexdump /var/iot/channels/2602111D
71 71  0000000 4646 4646 4646 3946 3030 3030 3030 3546
72 -0000010 6865 6c6c 6f20 776f 726c 6400 --> Got ASCII code "hello world"
81 +0000010 6865 6c6c 6f20 776f 726c 6400      ~-~-> Got ASCII code "hello world"    
73 73  000001c
74 -}}}
83 +)))
75 75  
76 -{{{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.
77 -}}}
85 +(% class="box" %)
86 +(((
87 +(% class="mark" %)**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.
88 +)))
78 78  
79 79  === 2.2.1 Decode Method ===
80 80  
81 -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.
92 +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.
82 82  
83 83  For example we have a LHT65 , works in ABP mode and gateway successful get the data, which are:
84 84  
85 -{{{root@dragino-1baf44:~# hexdump /var/iot/channels/01826108
96 +(% class="box" %)
97 +(((
98 +root@dragino-1baf44:~~# hexdump /var/iot/channels/01826108
86 86  0000000 4646 4646 4646 4537 3030 3030 3030 3438
87 -0000010 ccd1 7fff 7fff 017f ff7f ff00
100 +0000010 ccd1 7fff 7fff 017f ff7f ff00         
88 88  000001c
89 -}}}
102 +)))
90 90  
91 91  If we choose ASCII decoder, the MQTT process will send out with mqtt-data:
92 92  
93 -{{{Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
106 +(% class="box" %)
107 +(((
108 +Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
94 94  Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:decoder: ASCII
95 95  Sun Sep 27 04:33:16 2020 user.notice root: [IoT.MQTT]:mqtt_data[-m]: ffffffe700000048ccd17fff7fff017fff7fff00
96 -}}}
111 +)))
97 97  
98 98  If we choose Decode_LHT65, the MQTT process will send out with mqtt-data
99 99  
100 -{{{Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
115 +(% class="box" %)
116 +(((
117 +Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:pub_topic[-t]: dragino-1baf44/01826108/data
101 101  Sun Sep 27 04:36:45 2020 user.notice root: [IoT.MQTT]:decoder: Dragino_LHT65
102 102  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,
103 103  "EXT":"Temperature Sensor","RSSI":-24,"TempC_SHT":85.0,"SNR":8.2,"ext_sensor":0}
104 -}}}
121 +)))
105 105  
106 106  Above scripts are store in /etc/lora/decoder/. User can put their scripts here and select it in the UI.
107 107  

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