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1		-**~ Contents:**
	1	+**~ Table of Contents:**
2	2
3	3	{{toc/}}
4	4
5	5
6	6
7		-= 1. Introduction =
	7	+= 1.  Introduction =
8	8
	9	+
9	9	(((
10	10	In this chapter, we set up a CoAP/ MQTT server by using Open Source MQTT Broker : [[EMQX.IO>>url:https://www.emqx.io/]]. And show how to communicate it with CoAP and MQTT.
11	11	)))
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12	12
13	13	(((
14	14	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.
	16	+
	17	+
15	15	)))
16	16
17	17	[[image:image-20220530084843-1.png]]
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19	19	Network structure
20	20
21	21
22		-= 2. Install CoAP server =
23	23
	26	+= 2.  Install CoAP server =
	27	+
	28	+
24	24	Set up example in Ubuntu 18.04
25	25
26	26	(% class="box" %)
...	...	@@ -37,6 +37,7 @@
37	37	(((
38	38	(% 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.**
39	39
	45	+
40	40
41	41	)))
42	42
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44	44
45	45	== 3.1 Install Copper in Chrome ==
46	46
	53	+
47	47	(((
48	48	~1. Download Copper4Cr from [[https:~~/~~/github.com/mkovatsc/Copper4Cr>>url:https://github.com/mkovatsc/Copper4Cr]] and unpack it.
49	49	)))
...	...	@@ -51,6 +51,7 @@
51	51	(((
52	52	2. Run install.bat in the directory.
53	53
	61	+
54	54	[[image:image-20220530085327-2.png]]
55	55	)))
56	56
...	...	@@ -57,6 +57,7 @@
57	57	Run install.bat
58	58
59	59
	68	+
60	60	3. Load the unpacked CoAP APP in Google Chrome:
61	61
62	62	[[image:image-20220530085423-3.png||height="241" width="1250"]]
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64	64	Install Copper APP
65	65
66	66
	76	+
67	67	[[image:image-20220530085531-4.png]]
68	68
69	69	Install APP Successful
70	70
71	71
	82	+
72	72	4. Load the unpacked CoAP extension in Google Chrome:
73	73
74	74	[[image:image-20220530085638-5.png||height="338" width="1320"]]
...	...	@@ -81,6 +81,7 @@
81	81	Install Extension Successful
82	82
83	83
	95	+
84	84	5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID
85	85
86	86	[[image:image-20220530090444-10.png]]
...	...	@@ -88,6 +88,7 @@
88	88	Replace ID
89	89
90	90
	103	+
91	91	6. Open the Copper extension. If you see below message, means install successfully.
92	92
93	93	[[image:image-20220530090404-9.png||height="658" width="1238"]]
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95	95	Install Finished
96	96
97	97
98		-== 3.2 Test CoAP connection ==
99	99
	112	+== 3.2  Test CoAP connection ==
	113	+
	114	+
100	100	(((
101	101	Use Chrome Copper externsion to connect to the CoAP server. Input coap:~/~/COAP_SERVER_IP/mqtt/topic0?c=t1 to connect to the MQTT topic0 in CoAP server. Replace COAP_SERVER_IP with your COAP Server IP address, and refer [[here>>url:https://github.com/emqx/emqx-coap]] for the CoAP detail in EMQX. When connection ok, you can see below window.
102	102
	118	+
103	103	[[image:image-20220530090848-13.png||height="616" width="1154"]]
104	104	)))
105	105
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106	106	Connect to CoAP server
107	107
108	108
109		-== 3.3 Test CoAP Uplink ==
110	110
	126	+== 3.3  Test CoAP Uplink ==
	127	+
	128	+
111	111	(((
112	112	Try to use MQTT.fx to subscribe a the topic (topic0) in the server. And use CoAP to send a message to this topic, we can see the message arrive the topic0 and shown in MQTT.fx.
113	113
	132	+
114	114	[[image:image-20220530090939-14.png]]
115	115	)))
116	116
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117	117	Use MQTT.fx to subscribe the topic
118	118
119	119
	139	+
120	120	[[image:image-20220530091358-18.png||height="549" width="1035"]]
121	121
122	122	Use CoAP Exension to send a update to CoAP server
123	123
124	124
	145	+
125	125	[[image:image-20220530091237-17.png]]
126	126
127	127	MQTT.fx get the update of this topic on CoAP server
128	128
129	129
130		-== 3.4 Test CoAP Downlink ==
131	131
	152	+== 3.4  Test CoAP Downlink ==
	153	+
	154	+
132	132	(((
133	133	Try to use MQTT.fx to publish a message to the topic (topic0) in the server. CoAP extension will see this incomming message.
134	134	)))