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356	356	[[image:https://wiki.dragino.com/images/thumb/e/e8/V3_MQTT4.jpg/600px-V3_MQTT4.jpg||alt="V3 MQTT4.jpg" height="326" width="600"]]
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358	358	(((
	359	+(((
359	359	Downlinks can be scheduled by publishing the message to the topic v3/{application id}@{tenant id}/devices/{device id}/down/push.
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	362	+)))
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	365	+(((
363	363	Note: Remember that the format of this topic for The Things Stack Open Source deployment would be v3/{application id}/devices/{device id}/down/push.
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	368	+)))
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	371	+(((
367	367	Instead of /push, you can also use /replace to replace the downlink queue. Replacing with an empty array clears the downlink queue. Example:
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	374	+)))
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370	370	[[image:https://wiki.dragino.com/images/thumb/e/e8/V3_MQTT5.png/600px-V3_MQTT5.png||alt="V3 MQTT5.png" height="289" width="600"]]
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477	477
478	478	**3. Gateway Traffic Page in LoRaWAN Server**
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480		-* If the Join Request packet arrive the gateway traffic in server? If not, check the internet connection and gateway LoRaWAN server settings.
481		-* If the server send back a Join Accept for the Join Request? if not, check if the keys from the device match the keys you put in the server, or try to choose a different server route for this end device.
482		-* If the Join Accept message are in correct frequency? If you set the server to use US915 band, and your end node and gateway is EU868, you will see the Join Accept message are in US915 band so no possible to Join success.
	486	+* (((
	487	+If the Join Request packet arrive the gateway traffic in server? If not, check the internet connection and gateway LoRaWAN server settings.
	488	+)))
	489	+* (((
	490	+If the server send back a Join Accept for the Join Request? if not, check if the keys from the device match the keys you put in the server, or try to choose a different server route for this end device.
	491	+)))
	492	+* (((
	493	+If the Join Accept message are in correct frequency? If you set the server to use US915 band, and your end node and gateway is EU868, you will see the Join Accept message are in US915 band so no possible to Join success.
	494	+)))
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484	484	[[image:https://wiki.dragino.com/images/thumb/d/da/LoRaWAN_Communication_Debug22.png/600px-LoRaWAN_Communication_Debug22.png||height="268" width="600"]]
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493	493	**4. Data Page in LoRaWAN server**
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495	495	* (((
	508	+(((
496	496	If this data page shows the Join Request message from the end node? If not, most properly you have wrong settings in the keys. Keys in the server doesn't match the keys in End Node.
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	511	+)))
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499	499	[[image:https://wiki.dragino.com/images/thumb/9/99/LoRaWAN_Communication_Debug4.png/600px-LoRaWAN_Communication_Debug4.png||height="222" width="600"]]
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