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1		-Contents:
	1	+**~ Contents:**
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	3	+{{toc/}}
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4	4	= 1. Introduction =
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10	10	Use MQTT API for downlink: Reference: [[TTN Stack v3 MQTT reference>>url:https://thethingsstack.io/v3.1.0/guides/getting-started/mqtt/]]
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12		-
13	13	**Download command is:**
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15	15	(% class="box" %)
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73	73	== 3.2 MIC Mismatch or MIC Failed ==
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75	75	(((
	76	+(((
76	76	When the device is registered or the device is working normally, the problem of MIC mismatch and MIC failed occurs.
77	77	)))
	79	+)))
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79	79	(((
	82	+(((
80	80	Under normal circumstances, users need to change the APPKEY to solve this problem.
81	81	)))
	85	+)))
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83	83	[[image:https://wiki.dragino.com/images/thumb/d/dd/MIC_mismatch.png/600px-MIC_mismatch.png||height="208" width="600"]]
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