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1		-**~ Table of Contents:**
	1	+**~ Contents:**
2	2
3	3	{{toc/}}
4	4
5	5
6	6
7		-= 1.  Introduction =
	7	+= 1. Introduction =
8	8
9		-
10	10	(((
11	11	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.
12	12	)))
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13	13
14	14	(((
15	15	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		-
18	18	)))
19	19
20	20	[[image:image-20220530084843-1.png]]
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22	22	Network structure
23	23
24	24
	22	+= 2. Install CoAP server =
25	25
26		-= 2.  Install CoAP server =
27		-
28		-
29	29	Set up example in Ubuntu 18.04
30	30
31	31	(% class="box" %)
...	...	@@ -42,7 +42,6 @@
42	42	(((
43	43	(% 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.**
44	44
45		-
46	46
47	47	)))
48	48
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50	50
51	51	== 3.1 Install Copper in Chrome ==
52	52
53		-
54	54	(((
55	55	~1. Download Copper4Cr from [[https:~~/~~/github.com/mkovatsc/Copper4Cr>>url:https://github.com/mkovatsc/Copper4Cr]] and unpack it.
56	56	)))
...	...	@@ -58,7 +58,6 @@
58	58	(((
59	59	2. Run install.bat in the directory.
60	60
61		-
62	62	[[image:image-20220530085327-2.png]]
63	63	)))
64	64
...	...	@@ -65,7 +65,6 @@
65	65	Run install.bat
66	66
67	67
68		-
69	69	3. Load the unpacked CoAP APP in Google Chrome:
70	70
71	71	[[image:image-20220530085423-3.png||height="241" width="1250"]]
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73	73	Install Copper APP
74	74
75	75
76		-
77	77	[[image:image-20220530085531-4.png]]
78	78
79	79	Install APP Successful
80	80
81	81
82		-
83	83	4. Load the unpacked CoAP extension in Google Chrome:
84	84
85	85	[[image:image-20220530085638-5.png||height="338" width="1320"]]
...	...	@@ -92,7 +92,6 @@
92	92	Install Extension Successful
93	93
94	94
95		-
96	96	5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID
97	97
98	98	[[image:image-20220530090444-10.png]]
...	...	@@ -100,7 +100,6 @@
100	100	Replace ID
101	101
102	102
103		-
104	104	6. Open the Copper extension. If you see below message, means install successfully.
105	105
106	106	[[image:image-20220530090404-9.png||height="658" width="1238"]]
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108	108	Install Finished
109	109
110	110
	98	+== 3.2 Test CoAP connection ==
111	111
112		-== 3.2  Test CoAP connection ==
113		-
114		-
115	115	(((
116	116	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.
117	117
118		-
119	119	[[image:image-20220530090848-13.png||height="616" width="1154"]]
120	120	)))
121	121
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122	122	Connect to CoAP server
123	123
124	124
	109	+== 3.3 Test CoAP Uplink ==
125	125
126		-== 3.3  Test CoAP Uplink ==
127		-
128		-
129	129	(((
130	130	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.
131	131
132		-
133	133	[[image:image-20220530090939-14.png]]
134	134	)))
135	135
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136	136	Use MQTT.fx to subscribe the topic
137	137
138	138
139		-
140	140	[[image:image-20220530091358-18.png||height="549" width="1035"]]
141	141
142	142	Use CoAP Exension to send a update to CoAP server
143	143
144	144
145		-
146	146	[[image:image-20220530091237-17.png]]
147	147
148	148	MQTT.fx get the update of this topic on CoAP server
149	149
150	150
	130	+== 3.4 Test CoAP Downlink ==
151	151
152		-== 3.4  Test CoAP Downlink ==
153		-
154		-
155	155	(((
156	156	Try to use MQTT.fx to publish a message to the topic (topic0) in the server. CoAP extension will see this incomming message.
157	157	)))