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22	22	Network structure
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25	25	= 2.  Install CoAP server =
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41	41	(((
42	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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45	45	)))
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63	63	Run install.bat
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66	66	(% style="color:blue" %)**3. Load the unpacked CoAP APP in Google Chrome:**
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68	68	[[image:image-20220530085423-3.png||height="241" width="1250"]]
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70	70	Install Copper APP
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73	73	[[image:image-20220530085531-4.png]]
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75	75	Install APP Successful
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78	78	(% style="color:blue" %)**4. Load the unpacked CoAP extension in Google Chrome:**
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80	80	[[image:image-20220530085638-5.png||height="338" width="1320"]]
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87	87	Install Extension Successful
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90	90	(% style="color:blue" %)**5. Replace the appID in file extension\endpoint\ClientPortChrome.js to Copper (Cu4Cr) Application ID**
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92	92	[[image:image-20220530090444-10.png]]
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94	94	Replace ID
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97	97	(% style="color:blue" %)**6. Open the Copper extension. If you see below message, means install successfully.**
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99	99	[[image:image-20220530090404-9.png||height="658" width="1238"]]
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101	101	Install Finished
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	111	+
104	104	== 3.2  Test CoAP connection ==
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114	114	Connect to CoAP server
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117	117	== 3.3  Test CoAP Uplink ==
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127	127	Use MQTT.fx to subscribe the topic
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130	130	[[image:image-20220530091358-18.png||height="549" width="1035"]]
131	131
132	132	Use CoAP Exension to send a update to CoAP server
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135	135	[[image:image-20220530091237-17.png]]
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137	137	MQTT.fx get the update of this topic on CoAP server
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	151	+
140	140	== 3.4  Test CoAP Downlink ==
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143	143	(((
144	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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147	147	)))