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1		-Contents:
	1	+**~ Contents:**
2	2
	3	+{{toc/}}
3	3
4	4	= 1. Introduction =
5	5
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9	9
10	10	Use MQTT API for downlink: Reference: [[TTN Stack v3 MQTT reference>>url:https://thethingsstack.io/v3.1.0/guides/getting-started/mqtt/]]
11	11
12		-
	13	+(((
13	13	**Download command is:**
	15	+)))
14	14
15	15	(% class="box" %)
16	16	(((
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17	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	18	)))
19	19
20		-
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21	21	The MQTT command use (% style="color:#4f81bd" %)**-h,-p,-u,-P** (%%)options. We can find them in the website.
	24	+)))
22	22
23	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"]]
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73	73	== 3.2 MIC Mismatch or MIC Failed ==
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75	75	(((
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76	76	When the device is registered or the device is working normally, the problem of MIC mismatch and MIC failed occurs.
77	77	)))
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78	78
79	79	(((
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80	80	Under normal circumstances, users need to change the APPKEY to solve this problem.
81	81	)))
	88	+)))
82	82
83	83	[[image:https://wiki.dragino.com/images/thumb/d/dd/MIC_mismatch.png/600px-MIC_mismatch.png||height="208" width="600"]]
84	84