MQTTS-Verify Server 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
2. 명령시퀀스: MQTTS – Verify Server
| No | Command | Response | Description |
| 1 | PDP Context 설정 | ||
| 2.1 | AT+CCERTDOWN=”server_ca.pem”,1602 |
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| 2.2 |
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| – | AT+CCERTLIST |
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| – | AT+CCERTDELE=”server_ca.pem” |
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| 3 | AT+CSSLCFG=”sslversion”,0,4\ |
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Set the SSL version of the first SSL context |
| 4 | AT+CSSLCFG=”authmode”,0,1 |
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Set the authentication mode(verify server) of the first SSL context |
| 5 |
AT+CSSLCFG=”cacert”,0, “server_ca.pem” |
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| 6 | AT+CMQTTSTART |
+CMQTTSTART: 0 OK |
Start MQTT service, activate PDP context |
| 7 | AT+CMQTTACCQ=0, “client test0” | OK |
Acquire one client which will connect to a MQTT server without SSL/TLS. |
| 8 | AT+CMQTTSSLCFG=0,0 | OK |
Set the first SSL context to be used in the SSL connection |
| 4.1 | AT+CMQTTWILLTOPIC=0,10 | > | Set the topic of the will |
| 4.2 | >Topic_will | 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://mqtts_server:port”,60,1 |
OK +CMQTTCONNECT: 0,0 |
Connect to a MQTT server, input the right server and port. |
| 7.1 | AT+CMQTTTOPIC=0,13 | > | Set the topic for the PUBLISH message |
| 7.2 | >dddrrrggghhhk | OK | Input topic to publish |
| 8.1 | AT+CMQTTPAYLOAD=0,60 | > | Set the payload for the PUBLISH message |
| 8.2 |
>012345678901234567890123456789 012345678901234567890123456789 |
OK | Input message |
| 9 | AT+CMQTTPUB=0,1,60 |
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Publish a message |
| 10.1 | AT+CMQTTSUBTOPIC=0,9,1 | > | Set one topic for the SUBSCRIBE message |
| 10.2 | >123456789 | OK | |
| 11 | AT+CMQTTSUB=0 | OK +CMQTTSUB: 0,0 |
Subscribe a message |
| 12.1 | AT+CMQTTUNSUB=0,9,1 | > | Unsubscribe one topic from the server |
| 12.2 | >simcommsg |
OK +CMQTTUNSUB: 0,0 |
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| 13 | AT+CMQTTDISC=0,120 |
OK +CMQTTDISC: 0,0 |
Disconnect from server |
| 14 | AT+CMQTTREL=0 | OK | Release the client |
| 15 | AT+CMQTTSTOP |
+CMQTTSTOP: 0 OK +CMQTTNONET |
Stop MQTT Service |
WiFi IoT Module
Bluetooth Module
5G/LTE/CAT-M1/NB-IoT
