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...	...	@@ -36,14 +36,16 @@
36	36
37	37	[[image:image-20220526142338-3.png]]
38	38
39		-find -h : broker address , -p port and -u: user name
	39	+**find -h : broker address , -p port and -u: user name**
40	40
41	41
	42	+
42	42	[[image:image-20220526142307-2.png]]
43	43
44		-find -P : Password
	45	+**find -P : Password**
45	45
46	46
	48	+
47	47	User MQTT.FX to simulate a downlink
48	48
49	49	[[image:image-20220526142421-4.png]]
...	...	@@ -51,6 +51,7 @@
51	51	Use MQTT.FX to simulate downlink
52	52
53	53
	56	+
54	54	Input connection info
55	55
56	56	[[image:image-20220526142512-5.png]]
...	...	@@ -58,6 +58,7 @@
58	58	Input MQTT connection info
59	59
60	60
	64	+
61	61	Send a downstream
62	62
63	63	[[image:image-20220526142539-6.png]]
...	...	@@ -65,9 +65,11 @@
65	65	Gateway traffic for downstream
66	66
67	67
	72	+
68	68	[[image:image-20220526142616-7.png||height="579" width="1407"]]
69	69
70	70
	76	+
71	71	Downstream data flow will like below:
72	72
73	73	[[image:image-20220526142741-8.png]]
...	...	@@ -75,21 +75,27 @@
75	75	[[image:image-20220526142826-9.png]]
76	76
77	77
78		-= 3. Trouble Shooting =
79	79
80		-== 3.1 Problem when register a device to TTNv3 if it is already register to TTNv2 ==
	85	+= 3.  Trouble Shooting =
81	81
	87	+== 3.1  Problem when register a device to TTNv3 if it is already register to TTNv2 ==
	88	+
	89	+
82	82	When you register the device in V2 and V3 with the same key and EUI, the device can only connect to V2.
83	83
	92	+
84	84	[[image:image-20220526142914-10.png]]
85	85
86	86	[[image:image-20220526143018-11.png||height="619" width="1049"]]
87	87
	97	+
88	88	If you want the device to connect to V3. You must change your key and EUI, or delete the device registered on V2.
89	89
90	90
91		-== 3.2 MIC Mismatch or MIC Failed ==
92	92
	102	+== 3.2  MIC Mismatch or MIC Failed ==
	103	+
	104	+
93	93	(((
94	94	(((
95	95	When the device is registered or the device is working normally, the problem of MIC mismatch and MIC failed occurs.
...	...	@@ -99,6 +99,8 @@
99	99	(((
100	100	(((
101	101	Under normal circumstances, users need to change the APPKEY to solve this problem.
	114	+
	115	+
102	102	)))
103	103	)))
104	104