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1		-{{box cssClass="floatinginfobox" title="**Contents**"}}
2		-{{toc/}}
3		-{{/box}}
	1	+Contents:
4	4
5		-= Paragraph 1 =
6	6
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	4	+= 1. Introduction =
8	8
9		-== Sub-paragraph ==
	6	+Notes for using Dragino Devices with TTN Stack3.
10	10
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	8	+= 2. Downlink =
12	12
13		-== Sub-paragraph ==
	10	+Use MQTT API for downlink: Reference: [[TTN Stack v3 MQTT reference>>url:https://thethingsstack.io/v3.1.0/guides/getting-started/mqtt/]]
14	14
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16	16
17		-=== Sub-sub paragraph ===
	13	+**Download command is:**
18	18
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	15	+(% class="box" %)
	16	+(((
	17	+mosquitto_pub -h eu1.cloud.thethings.industries -p 1883 -t v3/akXXXXXps@XXXXXX/devices/lsn50/down/push -u akXXXXXps@XXXXXX -P NNSXS.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.LVQZECLX5FZ3XO5ACOW47IZ6HM54DMBBU776C53ZQHPLPQALIXYA -m '{"downlinks":[{"f_port": 2,"frm_payload":"AwAA","priority": "HIGH","confirmed": true}]}'
	18	+)))
20	20
21	21
22		-= Paragraph 2 =
	21	+The MQTT command use (% style="color:#4f81bd" %)**-h,-p,-u,-P** (%%)options. We can find them in the website.
23	23
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	23	+[[image:https://wiki.dragino.com/images/thumb/2/2f/Stack_v3_downlink_1.png/600px-Stack_v3_downlink_1.png||height="375" width="600"]]
25	25
26		-== Sub-paragraph ==
	25	+find -h : broker address , -p port and -u: user name
27	27
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	27	+[[image:https://wiki.dragino.com/images/thumb/a/a6/Stack_v3_downlink_2.png/600px-Stack_v3_downlink_2.png||height="395" width="600"]]
29	29
30		-== Sub-paragraph ==
	29	+find -P : Password
31	31
32		-Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
	31	+
	32	+User MQTT.FX to simulate a downlink
	33	+
	34	+[[image:https://wiki.dragino.com/images/thumb/5/5c/Stack_v3_downlink_3.png/600px-Stack_v3_downlink_3.png||height="439" width="600"]]
	35	+
	36	+Use MQTT.FX to simulate downlink
	37	+
	38	+
	39	+Input connection info
	40	+
	41	+[[image:https://wiki.dragino.com/images/thumb/4/44/Stack_v3_downlink_4.png/600px-Stack_v3_downlink_4.png||height="437" width="600"]]
	42	+
	43	+Input MQTT connection info
	44	+
	45	+
	46	+Send a downstream
	47	+
	48	+[[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"]]
	49	+
	50	+Gateway traffic for downstream
	51	+
	52	+[[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"]]
	53	+
	54	+
	55	+Downstream data flow will like below:
	56	+
	57	+[[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"]]
	58	+
	59	+[[image:https://wiki.dragino.com/images/1/1f/Stack_v3_downlink_7.png||alt="Stack v3 downlink 7.png" height="371" width="453"]]
	60	+
	61	+= 3. Trouble Shooting =
	62	+
	63	+== 3.1 Problem when register a device to TTNv3 if it is already register to TTNv2 ==
	64	+
	65	+When you register the device in V2 and V3 with the same key and EUI, the device can only connect to V2.
	66	+
	67	+[[image:https://wiki.dragino.com/images/thumb/0/0d/V3v2.png/600px-V3v2.png||alt="V3v2.png" height="403" width="600"]]
	68	+
	69	+[[image:https://wiki.dragino.com/images/thumb/b/b9/V2v3.png/600px-V2v3.png||alt="V2v3.png" height="352" width="600"]]
	70	+
	71	+If you want the device to connect to V3. You must change your key and EUI, or delete the device registered on V2.
	72	+
	73	+== 3.2 MIC Mismatch or MIC Failed ==
	74	+
	75	+(((
	76	+When the device is registered or the device is working normally, the problem of MIC mismatch and MIC failed occurs.
	77	+)))
	78	+
	79	+(((
	80	+Under normal circumstances, users need to change the APPKEY to solve this problem.
	81	+)))
	82	+
	83	+[[image:https://wiki.dragino.com/images/thumb/d/dd/MIC_mismatch.png/600px-MIC_mismatch.png||height="208" width="600"]]
	84	+
	85	+MIC Mismatch