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MQTT(No Security) – Without Checking UTF8 Coding

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: MQTT(No Security) – Without Checking UTF8 Coding

 

 

 

2. 명령시퀀스: MQTT(No Security) – Without Checking UTF8 Coding

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 AT+CMQTTCFG=”checkUTF8″,0,0 OK Set the topic of the will
5

AT+CMQTTCONNECT=0,

“tcp://test.mosquitto.org:1883”,60,1

OK

+CMQTTCONNECT: 0,0

Connect to a MQTT server
6.1 AT+CMQTTSUB=0,9,1 >

Subscribe one topic which is not UTF8 coding.

The data can input by hexadecimal fo

6.2 >Hi,모모

OK

+CMQTTSUB: 0,0

Input topic to subscribe
7.1 AT+CMQTTTOPIC=0,10 > Set the topic for the PUBLISH message
7.2 >Hi,모모 OK Input topic to publish
AT+CMQTTPAYLOAD=0,9 > 메시지 설정
>Hi,안녕   메시지 입력
8 AT+CMQTTPUB=0,1,60

+CMQTTRXSTART: 0,9,9

+CMQTTRXTOPIC: 0,9

Hi,모모

+CMQTTRXPAYLOAD: 0,9

Hi,안녕

+CMQTTRXEND: 0

+CMQTTPUB: 0,0

PUBLISH message

 

파랑색은 메시지를 설정한 경우로

자신이 발송한 메시지를 자신이 수신한 것임.

9 AT+CMQTTDISC=0,120

OK

+CMQTTDISC: 0,0

Disconnect from server
10 AT+CMQTTREL=0 OK Release the client
11 AT+CMQTTSTOP

+CMQTTSTOP: 0

OK

+CMQTTNONET

Stop MQTT Service

 

 

 

 

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