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23	23
24	24	(% style="color:#037691" %)**Video Instruction**(%%): **[[https:~~/~~/youtu.be/ZBjXwmp7rwM>>url:https://youtu.be/ZBjXwmp7rwM]]**
25	25
	26	+
26	26	Assume we have the LoRaWAN tracker LGT92 which works in ABP mode and US915 band. It has below keys:
27	27
28	28	(% class="box infomessage" %)
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38	38
39	39	We need to input above keys in LG308 and enable ABP decryption.
40	40
41		-[[image:https://wiki.dragino.com/images/thumb/5/55/LG308_MQTT_1.png/600px-LG308_MQTT_1.png||height="329" width="600"]]
	42	+[[image:image-20220527161119-1.png]]
42	42
43	43	Input the ABP keys in LG308
44	44
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51	51	We can see the log of LG308 to know this packet arrive
52	52	)))
53	53
54		-[[image:https://wiki.dragino.com/images/thumb/1/16/ABP_DECODE_2.png/600px-ABP_DECODE_2.png||height="205" width="600"]]
	55	+[[image:image-20220527161149-2.png]]
55	55
56	56	LG308 log by "logread -f" command
57	57
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61	61	(% class="box" %)
62	62	(((
63	63	root@dragino-1d25dc:~~# hexdump /var/iot/channels/2602111D
64		-0000000 (% class="mark" %)**4646 4646 4646 3946 3030 3030 3030 3546**(%%)      ~-~-> Got RSSI and SNR
65		-0000010 (% class="mark" %)**cc0c 0b63 0266 017f ff7f ff00 **(%%) ~-~-> Payload
	65	+0000000 (% style="color:#037691" %)**4646 4646 4646 3946 3030 3030 3030 3546**(%%)      ~-~-> Got RSSI and SNR
	66	+0000010 (% style="color:#037691" %)**cc0c 0b63 0266 017f ff7f ff00 **(%%) ~-~-> Payload
66	66	000001c
67	67	)))
68	68
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72	72
73	73	(% class="box" %)
74	74	(((
75		-(% 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:
76		-in LGT92, use **AT+SEND=12**:hello world to send ASCII string
	76	+(% 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:
	77	+in LGT92, use **(% style="color:#037691" %)AT+SEND=12:hello world** (%%)to send ASCII string
77	77	root@dragino-1d25dc:~~# hexdump /var/iot/channels/2602111D
78	78	0000000 4646 4646 4646 3946 3030 3030 3030 3546
79	79	0000010 6865 6c6c 6f20 776f 726c 6400      ~-~-> Got ASCII code "hello world"
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82	82
83	83	(% class="box" %)
84	84	(((
85		-(% 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.
	86	+(% style="color:#037691" %)**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.
86	86	)))
87	87
88	88	=== 2.2.1 Decode Method ===

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