Last modified by Xiaoling on 2023/04/20 18:14
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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 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