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264	264	This section is an example to show how to set up LG01-N to communicate with a MQTT server. The MQTT server is a simple utility set up in a local PC. Note: User can set up same server via [[this instruction>>url:http://www.steves-internet-guide.com/install-mosquitto-broker/]].
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266		-
267	267	== 4.2 Simulate via MQTT.fx utility ==
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269	269	The [[MQTT.fx>>url:http://mqttfx.jensd.de/index.php/download]] is a MQTT client tool. We can use this to simulate a MQTT connection to our MQTT broker first to make sure the MQTT broker works. This will also help us understand how it works.
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272	272	In this test, the MQTT broker and MQTT.fx are installed in the same PC, so the MQTT server address in MQTT.fx should be localhost. Below shows how to connect to the server.
273	273	)))
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275		-[[image:image-20220527134929-6.png]]
	274	+[[image:https://wiki.dragino.com/images/thumb/0/06/MQTT_Forward_4.png/600px-MQTT_Forward_4.png||height="201" width="600"]]
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277	277	Connect to MQTT Broker
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280	280	After connected, use publish to public some thing to MQTT server. This to simulate upsteam
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282		-[[image:image-20220527135037-7.png]]
	280	+[[image:https://wiki.dragino.com/images/thumb/b/bd/MQTT_Forward_5.png/600px-MQTT_Forward_5.png||height="149" width="600"]]
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284	284	Upstream: Publish message to MQTT Broker
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287	287	To simulate a downstream, use MQTT.fx to subscribe a topic, and publish something to this topic. as Below:
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289	289	[[image:https://wiki.dragino.com/images/thumb/3/3d/MQTT_Forward_6.png/600px-MQTT_Forward_6.png||height="279" width="600"]]

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