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MQTT(No Security) 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. MQTT(No Security) 통신시스템

 

 

 

2. MQTT(No Security) 명령시퀀스 

No Command Response Description
1 PDP Context 설정    
2 AT+CMQTTSTART

+CMQTTSTART: 0

OK

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

Acquire one client which will connect to

a MQTT server without SSL/TLS.

4.1 AT+CMQTTWILLTOPIC=0,10 > Set the topic of the will
4.2 >0123456789 OK Input 10 Character as topic
5.1 AT+CMQTTWILLMSG=0,6,1 > Set the will message
5.2 >qwerty OK Input 6 Character
6

AT+CMQTTCONNECT=0,

“tcp://test.mosquitto.org:1883”,60,1

OK

+CMQTTCONNECT: 0,0

Connect to a MQTT server
7.1 AT+CMQTTSUB=0,10,1 > Subscribe one topic from the server
7.2 >simcomtest

OK

+CMQTTSUB: 0,0

Input topic to subscribe
8.1 AT+CMQTTTOPIC=0,10 > Set the topic for the PUBLISH message
8.2 >simcomtest OK Input topic to publish
9.1 AT+CMQTTPAYLOAD=0,8 > Set the payload for the PUBLISH message
9.2 >Hi, MOMO OK Input message
10 AT+CMQTTPUB=0,1,60

OK

+CMQTTRXSTART: 0,10,8
+CMQTTRXTOPIC: 0,10
simcomtest
+CMQTTRXPAYLOAD: 0,8
Hi, MOMO
+CMQTTRXEND: 0

+CMQTTPUB: 0,0

Publish a message(검정색)

 

Subscribed a Message(파랑색)

– 자신이 발송한 메시지를 자신이 수신

11.1 AT+CMQTTSUBTOPIC=0,9,1 > Set one topic for the SUBSCRIBE message
11.2 >123456789 OK  
12 AT+CMQTTSUB=0 OK
+CMQTTSUB: 0,0
Subscribe a message
13.1 AT+CMQTTUNSUB=0,9,0 > Unsubscribe one topic from the server
13.2 >simcommsg

OK

+CMQTTUNSUB: 0,0

 
14 AT+CMQTTDISC=0,120

OK

+CMQTTDISC: 0,0

Disconnect from server <–> AT+CMATTCONNECT
15 AT+CMQTTREL=0 OK Release the client <–> AT+CMQTTACCQ
16 AT+CMQTTSTOP

+CMQTTSTOP: 0

OK

+CMQTTNONET

Stop MQTT Service<–> AT+CMATTSTART

 

 

 

 

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