Wiki source code of Set up CoAP Server

Version 16.4 by Xiaoling on 2022/07/22 16:48

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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
1.1	25
16.3	26	= 2. Install CoAP server =
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	28
1.2	29	Set up example in Ubuntu 18.04
1.1	30
1.2	31	(% class="box" %)
	32	(((
	33	sudo apt-get update
	34	sudo apt-get upgrade
	35	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.
	36	sudo dpkg –i emqx-ubuntu18.04-v3.2.4_amd64.deb #install EMQX
	37	emqx start # Start EMQX service
	38	emqx_ctl status #check if EMQX is running
	39	./bin/emqx_ctl plugins load emqx_coap # Run COAP service
	40	)))
1.1	41
1.5	42	(((
1.2	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.
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16.3	45
6.2	46
1.5	47	)))
1.1	48
16.4	49	= 3. Test CoAP Server =
1.1	50
16.4	51	== 3.1 Install Copper in Chrome ==
1.1	52
16.3	53
1.2	54	(((
16.4	55	(% style="color:blue" %)1. Download Copper4Cr from [[https:~~/~~/github.com/mkovatsc/Copper4Cr>>url:https://github.com/mkovatsc/Copper4Cr]] and unpack it.
1.2	56	)))
1.1	57
1.2	58	(((
16.4	59	(% style="color:blue" %)2. Run install.bat in the directory.
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16.3	61
6.2	62	[[image:image-20220530085327-2.png]]
1.2	63	)))
1.1	64
1.2	65	Run install.bat
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	67
16.3	68
16.4	69	(% style="color:blue" %)3. Load the unpacked CoAP APP in Google Chrome:
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16.1	71	[[image:image-20220530085423-3.png\|\|height="241" width="1250"]]
1.2	72
	73	Install Copper APP
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	75
16.3	76
6.2	77	[[image:image-20220530085531-4.png]]
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1.2	79	Install APP Successful
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16.4	83	(% style="color:blue" %)4. Load the unpacked CoAP extension in Google Chrome:
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7.3	85	[[image:image-20220530085638-5.png\|\|height="338" width="1320"]]
1.2	86
	87	Install Copper Extension
	88
15.1	89
16.1	90	[[image:image-20220530090104-7.png\|\|height="389" width="1282"]]
1.2	91
	92	Install Extension Successful
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	94
16.3	95
16.4	96	(% style="color:blue" %)5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID
1.2	97
9.2	98	[[image:image-20220530090444-10.png]]
1.2	99
	100	Replace ID
	101
	102
16.3	103
1.2	104	6. Open the Copper extension. If you see below message, means install successfully.
	105
8.4	106	[[image:image-20220530090404-9.png\|\|height="658" width="1238"]]
1.2	107
	108	Install Finished
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	110
	111
16.3	112	== 3.2 Test CoAP connection ==
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	114
1.2	115	(((
	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.
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16.3	118
10.2	119	[[image:image-20220530090848-13.png\|\|height="616" width="1154"]]
1.2	120	)))
	121
	122	Connect to CoAP server
	123
9.2	124
1.2	125
16.3	126	== 3.3 Test CoAP Uplink ==
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	128
1.2	129	(((
	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.
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16.3	132
11.2	133	[[image:image-20220530090939-14.png]]
1.2	134	)))
	135
	136	Use MQTT.fx to subscribe the topic
	137
	138
16.3	139
13.4	140	[[image:image-20220530091358-18.png\|\|height="549" width="1035"]]
1.2	141
	142	Use CoAP Exension to send a update to CoAP server
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	144
16.3	145
13.2	146	[[image:image-20220530091237-17.png]]
1.2	147
	148	MQTT.fx get the update of this topic on CoAP server
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11.4	150
1.2	151
16.3	152	== 3.4 Test CoAP Downlink ==
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	154
1.3	155	(((
1.2	156	Try to use MQTT.fx to publish a message to the topic (topic0) in the server. CoAP extension will see this incomming message.
1.3	157	)))

Wiki source code of Set up CoAP Server

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