Set up CoAP Server

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**~ Contents:**

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= 1. Introduction =

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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.

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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.

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[[image:image-20220530084843-1.png]]

Network structure

= 2. Install CoAP server =

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Set up example in Ubuntu 18.04

(% class="box" %)

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sudo apt-get update

sudo apt-get upgrade

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.

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sudo dpkg –i emqx-ubuntu18.04-v3.2.4_amd64.deb #install EMQX

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emqx start # Start EMQX service

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emqx_ctl status #check if EMQX is running

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./bin/emqx_ctl plugins load emqx_coap # Run COAP service

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(% 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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= 3. Test CoAP Server =

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== 3.1 Install Copper in Chrome ==

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~1. Download Copper4Cr from [[https:~~/~~/github.com/mkovatsc/Copper4Cr>>url:https://github.com/mkovatsc/Copper4Cr]] and unpack it.

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2. Run install.bat in the directory.

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[[image:image-20220530085327-2.png]]

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Run install.bat

3. Load the unpacked CoAP APP in Google Chrome:

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[[image:image-20220530085423-3.png]]

Install Copper APP

[[image:image-20220530085531-4.png]]

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Install APP Successful

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4. Load the unpacked CoAP extension in Google Chrome:

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[[image:image-20220530085638-5.png||height="338" width="1320"]]

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Install Copper Extension

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[[image:image-20220530090104-7.png]]

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Install Extension Successful

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5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID

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[[image:image-20220530090444-10.png]]

Replace ID

6. Open the Copper extension. If you see below message, means install successfully.

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[[image:image-20220530090404-9.png||height="658" width="1238"]]

Install Finished

== 3.2 Test CoAP connection ==

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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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[[image:image-20220530090848-13.png||height="616" width="1154"]]

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Connect to CoAP server

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== 3.3 Test CoAP Uplink ==

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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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[[image:image-20220530090939-14.png]]

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Use MQTT.fx to subscribe the topic

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[[image:image-20220530091358-18.png||height="549" width="1035"]]

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Use CoAP Exension to send a update to CoAP server

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[[image:image-20220530091237-17.png]]

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MQTT.fx get the update of this topic on CoAP server

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== 3.4 Test CoAP Downlink ==

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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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Wiki source code of Set up CoAP Server

Applications

Navigation

author	version	line-number	content
		1	~ Contents:
		2
		3	{{toc/}}
		4
		5
		6	= 1. Introduction =
		7
		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	)))
		11
		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	)))
		15
		16	[[image:image-20220530084843-1.png]]
		17
		18	Network structure
		19
		20
		21	= 2. Install CoAP server =
		22
		23	Set up example in Ubuntu 18.04
		24
		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	)))
		35
		36	(((
		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.
		38
		39
		40	)))
		41
		42	= 3. Test CoAP Server =
		43
		44	== 3.1 Install Copper in Chrome ==
		45
		46	(((
		47	~1. Download Copper4Cr from [[https:~~/~~/github.com/mkovatsc/Copper4Cr>>url:https://github.com/mkovatsc/Copper4Cr]] and unpack it.
		48	)))
		49
		50	(((
		51	2. Run install.bat in the directory.
		52
		53	[[image:image-20220530085327-2.png]]
		54	)))
		55
		56	Run install.bat
		57
		58
		59	3. Load the unpacked CoAP APP in Google Chrome:
		60
		61	[[image:image-20220530085423-3.png]]
		62
		63	Install Copper APP
		64
		65
		66	[[image:image-20220530085531-4.png]]
		67
		68	Install APP Successful
		69
		70
		71	4. Load the unpacked CoAP extension in Google Chrome:
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		73	[[image:image-20220530085638-5.png\|\|height="338" width="1320"]]
		74
		75	Install Copper Extension
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		77
		78	[[image:image-20220530090104-7.png]]
		79
		80	Install Extension Successful
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		82
		83	5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID
		84
		85	[[image:image-20220530090444-10.png]]
		86
		87	Replace ID
		88
		89
		90	6. Open the Copper extension. If you see below message, means install successfully.
		91
		92	[[image:image-20220530090404-9.png\|\|height="658" width="1238"]]
		93
		94	Install Finished
		95
		96
		97	== 3.2 Test CoAP connection ==
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		99	(((
		100	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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		102	[[image:image-20220530090848-13.png\|\|height="616" width="1154"]]
		103	)))
		104
		105	Connect to CoAP server
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		107
		108	== 3.3 Test CoAP Uplink ==
		109
		110	(((
		111	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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		113	[[image:image-20220530090939-14.png]]
		114	)))
		115
		116	Use MQTT.fx to subscribe the topic
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		118
		119	[[image:image-20220530091358-18.png\|\|height="549" width="1035"]]
		120
		121	Use CoAP Exension to send a update to CoAP server
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		123
		124	[[image:image-20220530091237-17.png]]
		125
		126	MQTT.fx get the update of this topic on CoAP server
		127
		128
		129	== 3.4 Test CoAP Downlink ==
		130
		131	(((
		132	Try to use MQTT.fx to publish a message to the topic (topic0) in the server. CoAP extension will see this incomming message.
		133	)))