Wiki source code of Set up CoAP Server

Version 11.4 by Xiaoling on 2022/05/30 09:12

version	line-number	content
1.3	1	~ Contents:
1.1	2
1.3	3	{{toc/}}
1.1	4
1.3	5
1.2	6	= 1. Introduction =
1.1	7
1.2	8	(((
	9	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.
	10	)))
1.1	11
1.2	12	(((
	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	)))
1.1	15
2.2	16	[[image:image-20220530084843-1.png]]
1.1	17
1.2	18	Network structure
1.1	19
2.2	20
1.2	21	= 2. Install CoAP server =
1.1	22
1.2	23	Set up example in Ubuntu 18.04
1.1	24
1.2	25	(% class="box" %)
	26	(((
	27	sudo apt-get update
	28	sudo apt-get upgrade
	29	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.
	30	sudo dpkg –i emqx-ubuntu18.04-v3.2.4_amd64.deb #install EMQX
	31	emqx start # Start EMQX service
	32	emqx_ctl status #check if EMQX is running
	33	./bin/emqx_ctl plugins load emqx_coap # Run COAP service
	34	)))
1.1	35
1.5	36	(((
1.2	37	(% 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.
6.2	38
	39
1.5	40	)))
1.1	41
1.2	42	= 3. Test CoAP Server =
1.1	43
1.2	44	== 3.1 Install Copper in Chrome ==
1.1	45
1.2	46	(((
	47	~1. Download Copper4Cr from [[https:~~/~~/github.com/mkovatsc/Copper4Cr>>url:https://github.com/mkovatsc/Copper4Cr]] and unpack it.
	48	)))
1.1	49
1.2	50	(((
	51	2. Run install.bat in the directory.
6.2	52
	53	[[image:image-20220530085327-2.png]]
1.2	54	)))
1.1	55
1.2	56
	57	Run install.bat
	58
	59
	60	3. Load the unpacked CoAP APP in Google Chrome:
	61
6.2	62	[[image:image-20220530085423-3.png]]
1.2	63
	64	Install Copper APP
	65
	66
6.2	67	[[image:image-20220530085531-4.png]]
	68
1.2	69	Install APP Successful
	70
	71
	72	4. Load the unpacked CoAP extension in Google Chrome:
	73
7.3	74	[[image:image-20220530085638-5.png\|\|height="338" width="1320"]]
1.2	75
	76	Install Copper Extension
	77
7.2	78	[[image:image-20220530090104-7.png]]
1.2	79
6.2	80
1.2	81	Install Extension Successful
	82
	83
	84	5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID
	85
9.2	86	[[image:image-20220530090444-10.png]]
1.2	87
8.3	88
1.2	89	Replace ID
	90
	91
	92	6. Open the Copper extension. If you see below message, means install successfully.
	93
8.4	94	[[image:image-20220530090404-9.png\|\|height="658" width="1238"]]
1.2	95
	96	Install Finished
	97
	98
	99	== 3.2 Test CoAP connection ==
	100
	101	(((
	102	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.
10.2	103
	104	[[image:image-20220530090848-13.png\|\|height="616" width="1154"]]
1.2	105	)))
	106
	107
	108	Connect to CoAP server
	109
9.2	110
1.2	111	== 3.3 Test CoAP Uplink ==
	112
	113	(((
	114	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	115
	116	[[image:image-20220530090939-14.png]]
1.2	117	)))
	118
	119
	120	Use MQTT.fx to subscribe the topic
	121
	122
	123
	124	Use CoAP Exension to send a update to CoAP server
	125
	126
	127
	128	MQTT.fx get the update of this topic on CoAP server
	129
11.4	130
1.2	131	== 3.4 Test CoAP Downlink ==
	132
1.3	133	(((
1.2	134	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	135	)))

Wiki source code of Set up CoAP Server

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