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MQTTS-Verify Server and Client 통신연습 

MQTT (Message Queuing Telemetry Transport) is a lightweight broker-based publish/subscribe messaging protocol.

It is a machine-to-machine (M2M)/”Internet of Things” connectivity protocol.

It was designed as an extremely lightweight publish/subscribe messaging transport.

It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.

 

 

 

 

1. 통신시스템: MQTTS-Verify Server and Client

 

 

 

2. 명령시퀀스: MQTTS-Verify Server and Client

 

No Command Response Description
1 PDP Context 설정    
2.1

AT+CCERTDOWN=

“server_ca.pem”,1602

   
       
3.1

AT+CCERTDOWN=

“client_cert.pem”,1740

   
       
 4.1

AT+CCERTDOWN=

“client_cert.key.pem”,8383\r

   
       
AT+CCERTLIST    
AT+CCERTDELE=”server_ca.pem”    
5 AT+CSSLCFG=”sslversion”,0,4\   Set the SSL version of the first SSL context
6 AT+CSSLCFG=”authmode”,0,1  

Set the authentication mode(verify server)

of the first SSL context

7

AT+CSSLCFG=”cacert”,0,

“server_ca.pem”

   
8 AT+CSSLCFG=”clientcert”,0,”cert.pem”\r    
9 AT+CSSLCFG=”clientkey”,0,”cert.key.pem”\r    
10 AT+CMQTTSTART

+CMQTTSTART: 0

OK

Start MQTT service, activate PDP context
11 AT+CMQTTACCQ=0, “client test0” OK

Acquire one client which will connect to

a MQTT server without SSL/TLS.

12 AT+CMQTTSSLCFG=0,0 OK

Set the first SSL context

to be used in the SSL connection

13.1 AT+CMQTTWILLTOPIC=0,10 > Set the topic of the will
13.2 >Topic_will OK Input 10 Character as topic
14.1 AT+CMQTTWILLMSG=0,6,1 > Set the will message
14.2 >qwerty OK Input 6 Character
15

AT+CMQTTCONNECT=0,

“tcp://hooleeping.com:8883”,60,1

OK

+CMQTTCONNECT: 0,0

Connect to a MQTT server,

input the right server and port.

       
       
16.1 AT+CMQTTTOPIC=0,13 > Set the topic for the PUBLISH message
16.2 >dddrrrggghhhk OK Input topic to publish
17.1 AT+CMQTTPAYLOAD=0,60 > Set the payload for the PUBLISH message
17.2

>012345678901234567890123456789

012345678901234567890123456789

OK Input message
18 AT+CMQTTPUB=0,1,60   Publish a message
19.1 AT+CMQTTSUBTOPIC=0,9,1 > Set one topic for the SUBSCRIBE message
19.2 >123456789 OK  
20 AT+CMQTTSUB=0 OK
+CMQTTSUB: 0,0
Subscribe a message
20.1 AT+CMQTTSUB=0,9,0 >  
20.2 >simcommsg    
21.1 AT+CMQTTUNSUB=0,9,0 > Unsubscribe one topic from the server
21.2 >simcommsg

OK

+CMQTTUNSUB: 0,0

 
23 AT+CMQTTDISC=0,120

OK

+CMQTTDISC: 0,0

Disconnect from server
24 AT+CMQTTREL=0 OK Release the client
25 AT+CMQTTSTOP

+CMQTTSTOP: 0

OK

+CMQTTNONET

Stop MQTT Service

 

 

 

 

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