MQTT, MQTTS, SSL, TLS, Client, Mosquitto → MQTT Message Topic, Publish, Subscribe 

 

MQTT SSL/TLS message exchange → Using Mosquitto Client

We will try MQTT communication by applying MQTT SSL/TLS security using the mosquitto client.

See How to Create a Certificate and Key with OpenSSL for SSL/TLS → § TCP, SSL/TLS, 키와 인증서 만들기 | momoiot 

The test system configuration is as follows.

 

 

 

 

 

 

1.  MQTT Broker/Server Setup

♦ Open the mosquitto configuration file (conf) → TLS/SSL settings for communication → Save

Modify mosquitto.conf Description port 8883   cafile D:\cert\ca.crt Specifies the ca certificate file certfile D:\cert\server.crt Specifies the server certificate file. keyfile D:\cert\server.key Specifies the server security key. require_certificate true

 

 

 

2. Start MQTT Broker

Run the Mosquitto broker from a Windows command on your PC. → D:\mosquitto>mosquitto -v -c mosquitto.conf

 

 

 

 

3. Run an MQTT client subscribing to the topic “/momo”.

Run a Mosquitto client that subscribes to MQTT messages published to the topic “/momo”.

→ D:\mosquitto>mosquitto_sub -v -t /momo -p 8883 -h 192.168.0.2 –cafile D:\cert\ca.crt –cert D:\cert\client.crt –key D:\cert\client.key

 

 

 

♦ The log message output from the MQTT server according to the connection of a new client is as follows.

 

 

 

 

4. Launch an MQTT client that publishes messages on the topic “/momo”.

Run the Mosquitto client that publish MQTT messages to the topic “/momo”.

→ D:\mosquitto>mosquitto_pub -t /momo -p 8883 -h 192.168.0.2 –cafile d:\cert\ca.crt –cert d:\cert\client.crt –key d:\cert\client.key -m “hello, momo!”

 

 

 

♦ The message reception result of the MQTT client subscribing to the topic “/momo” is as follows.