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42	42
43	43	Input connection info
44	44
45		-[[image:https://wiki.dragino.com/images/thumb/4/44/Stack_v3_downlink_4.png/600px-Stack_v3_downlink_4.png||height="437" width="600"]]
	45	+[[image:image-20220526142512-5.png]]
46	46
47	47	Input MQTT connection info
48	48
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49	49
50	50	Send a downstream
51	51
52		-[[image:https://wiki.dragino.com/images/thumb/e/ec/Stack_v3_downlink_5.png/600px-Stack_v3_downlink_5.png||alt="Stack v3 downlink 5.png" height="438" width="600"]]
	52	+[[image:image-20220526142539-6.png]]
53	53
54	54	Gateway traffic for downstream
55	55
56		-[[image:https://wiki.dragino.com/images/thumb/8/8a/Stack_v3_downlink_8.png/600px-Stack_v3_downlink_8.png||alt="Stack v3 downlink 8.png" height="235" width="600"]]
	56	+[[image:image-20220526142616-7.png||height="579" width="1407"]]
57	57
58	58
59	59	Downstream data flow will like below:
60	60
61		-[[image:https://wiki.dragino.com/images/thumb/d/d1/Stack_v3_downlink_6.png/600px-Stack_v3_downlink_6.png||alt="Stack v3 downlink 6.png" height="233" width="600"]]
	61	+[[image:image-20220526142741-8.png]]
62	62
63		-[[image:https://wiki.dragino.com/images/1/1f/Stack_v3_downlink_7.png||alt="Stack v3 downlink 7.png" height="371" width="453"]]
	63	+[[image:image-20220526142826-9.png]]
64	64
	65	+
65	65	= 3. Trouble Shooting =
66	66
67	67	== 3.1 Problem when register a device to TTNv3 if it is already register to TTNv2 ==
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68	68
69	69	When you register the device in V2 and V3 with the same key and EUI, the device can only connect to V2.
70	70
71		-[[image:https://wiki.dragino.com/images/thumb/0/0d/V3v2.png/600px-V3v2.png||alt="V3v2.png" height="403" width="600"]]
	72	+[[image:image-20220526142914-10.png]]
72	72
73		-[[image:https://wiki.dragino.com/images/thumb/b/b9/V2v3.png/600px-V2v3.png||alt="V2v3.png" height="352" width="600"]]
	74	+[[image:image-20220526143018-11.png||height="619" width="1049"]]
74	74
75	75	If you want the device to connect to V3. You must change your key and EUI, or delete the device registered on V2.
76	76
	78	+
77	77	== 3.2 MIC Mismatch or MIC Failed ==
78	78
79	79	(((
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88	88	)))
89	89	)))
90	90
91		-[[image:https://wiki.dragino.com/images/thumb/d/dd/MIC_mismatch.png/600px-MIC_mismatch.png||height="208" width="600"]]
	93	+[[image:image-20220526143057-12.png]]
92	92
93	93	MIC Mismatch

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