Wiki source code of Set up CoAP Server

Last modified by Xiaoling on 2024/08/19 16:01

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16.3	1	~ Table of Contents:
1.1	2
1.3	3	{{toc/}}
1.1	4
1.3	5
16.1	6
16.3	7	= 1. Introduction =
1.1	8
16.3	9
1.2	10	(((
	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	)))
1.1	13
1.2	14	(((
	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.
16.3	16
	17
1.2	18	)))
1.1	19
2.2	20	[[image:image-20220530084843-1.png]]
1.1	21
1.2	22	Network structure
1.1	23
2.2	24
16.3	25	= 2. Install CoAP server =
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	27
1.2	28	Set up example in Ubuntu 18.04
1.1	29
1.2	30	(% class="box" %)
	31	(((
	32	sudo apt-get update
	33	sudo apt-get upgrade
	34	wget [[https:~~/~~/www.emqx.io/downloads/broker/v3.2.7/emqx-ubuntu18.04-v3.2.7_amd64.deb>>url:https://www.emqx.io/downloads/broker/v3.2.7/emqx-ubuntu18.04-v3.2.7_amd64.deb]] #download the installation package.
	35	sudo dpkg –i emqx-ubuntu18.04-v3.2.4_amd64.deb #install EMQX
	36	emqx start # Start EMQX service
	37	emqx_ctl status #check if EMQX is running
	38	./bin/emqx_ctl plugins load emqx_coap # Run COAP service
	39	)))
1.1	40
1.5	41	(((
1.2	42	(% 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.
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1.5	45	)))
1.1	46
16.4	47	= 3. Test CoAP Server =
1.1	48
16.4	49	== 3.1 Install Copper in Chrome ==
1.1	50
16.3	51
1.2	52	(((
16.4	53	(% style="color:blue" %)1. Download Copper4Cr from [[https:~~/~~/github.com/mkovatsc/Copper4Cr>>url:https://github.com/mkovatsc/Copper4Cr]] and unpack it.
1.2	54	)))
1.1	55
1.2	56	(((
16.4	57	(% style="color:blue" %)2. Run install.bat in the directory.
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16.3	59
6.2	60	[[image:image-20220530085327-2.png]]
1.2	61	)))
1.1	62
1.2	63	Run install.bat
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	65
16.4	66	(% style="color:blue" %)3. Load the unpacked CoAP APP in Google Chrome:
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16.1	68	[[image:image-20220530085423-3.png\|\|height="241" width="1250"]]
1.2	69
	70	Install Copper APP
	71
	72
6.2	73	[[image:image-20220530085531-4.png]]
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1.2	75	Install APP Successful
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16.4	78	(% style="color:blue" %)4. Load the unpacked CoAP extension in Google Chrome:
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7.3	80	[[image:image-20220530085638-5.png\|\|height="338" width="1320"]]
1.2	81
	82	Install Copper Extension
	83
15.1	84
16.1	85	[[image:image-20220530090104-7.png\|\|height="389" width="1282"]]
1.2	86
	87	Install Extension Successful
	88
	89
16.4	90	(% style="color:blue" %)5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID
1.2	91
9.2	92	[[image:image-20220530090444-10.png]]
1.2	93
	94	Replace ID
	95
	96
16.6	97	(% style="color:blue" %)6. Open the Copper extension. If you see below message, means install successfully.
1.2	98
8.4	99	[[image:image-20220530090404-9.png\|\|height="658" width="1238"]]
1.2	100
	101	Install Finished
	102
	103
16.3	104	== 3.2 Test CoAP connection ==
	105
	106
1.2	107	(((
	108	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.
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16.3	110
10.2	111	[[image:image-20220530090848-13.png\|\|height="616" width="1154"]]
1.2	112	)))
	113
	114	Connect to CoAP server
	115
9.2	116
16.3	117	== 3.3 Test CoAP Uplink ==
	118
	119
1.2	120	(((
	121	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.
11.2	122
16.3	123
11.2	124	[[image:image-20220530090939-14.png]]
1.2	125	)))
	126
	127	Use MQTT.fx to subscribe the topic
	128
	129
13.4	130	[[image:image-20220530091358-18.png\|\|height="549" width="1035"]]
1.2	131
	132	Use CoAP Exension to send a update to CoAP server
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	134
13.2	135	[[image:image-20220530091237-17.png]]
1.2	136
	137	MQTT.fx get the update of this topic on CoAP server
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11.4	139
16.3	140	== 3.4 Test CoAP Downlink ==
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	142
1.3	143	(((
1.2	144	Try to use MQTT.fx to publish a message to the topic (topic0) in the server. CoAP extension will see this incomming message.
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	146
1.3	147	)))

Wiki source code of Set up CoAP Server

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