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13	13	Below is the network structure. The end device use CoAP to connect our Emqx server via NB-IoT network. EMQ X broker will further process the data for the actually application.
14	14	)))
15	15
16		-[[image:https://wiki.dragino.com/images/thumb/2/25/CoAP_1.png/600px-CoAP_1.png||height="219" width="600"]]
	16	+[[image:image-20220530084843-1.png]]
17	17
18	18	Network structure
19	19
	20	+
20	20	= 2. Install CoAP server =
21	21
22	22	Set up example in Ubuntu 18.04
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32	32	./bin/emqx_ctl plugins load emqx_coap # Run COAP service
33	33	)))
34	34
	36	+(((
35	35	(% style="color:red" %)**Notice: CoAP default port use 5683, if you install EMQX in a cloud server, make sure you open the UDP port 5683. So can receive the packets from NB-IoT.**
	38	+)))
36	36
37	37	= 3. Test CoAP Server =
38	38
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57	57
58	58	Install Copper APP
59	59
60		-[[image:https://wiki.dragino.com/images/thumb/7/70/CoAP_Test_3.png/600px-CoAP_Test_3.png||height="523" width="600"]]
	63	+[[image:https://wiki.dragino.com/images/thumb/7/70/CoAP_Test_3.png/687px-CoAP_Test_3.png||alt="File:CoAP Test 3.png"]]
61	61
62	62	Install APP Successful
63	63
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97	97
98	98	Connect to CoAP server
99	99
100		-
101	101	== 3.3 Test CoAP Uplink ==
102	102
103	103	(((
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118	118
119	119	MQTT.fx get the update of this topic on CoAP server
120	120
121		-
122	122	== 3.4 Test CoAP Downlink ==
123	123
124	124	(((
125	125	Try to use MQTT.fx to publish a message to the topic (topic0) in the server. CoAP extension will see this incomming message.
126	126	)))
127		-
128		-
129		-Use MQTT.fx to publish the topic
130		-
131		-
132		-CoAP extension see the incoming message

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