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Learning CenterApplies to Models: Select Hanwha Cameras
Summary
This article details installing and using Mosquitto MQTT with Hanwha cameras that support this function. MQTT is a simple messaging protocol designed for constrained devices with low bandwidth. MQTT is the perfect solution for exchanging data between multiple IoT devices. MQTT communications work as a publish and subscribe system. Devices publish messages on a specific topic, and all devices subscribed to that topic receive the message. Since Mosquitto is free software, this article should be treated as a proof of concept. We do not know how much traffic a Mosquitto server can handle.
Configuring MQTT
- Download and install Mosquitto onto your PC.
- Navigate to C:\Program Files\mosquitto and edit the mosquitto.conf file. Add the following to the bottom of the mosquitto.conf file:
-
- listener 1883 0.0.0.0 # TCP
- allow_anonymous true
- log_timestamp_format %Y-%m-%dT%H:%M:%S
-
- Open the Command Prompt and navigate to the mosquitto directory. Enter the following command for logging to commence:
- C:\Program Files\mosquitto> mosquitto.exe -c mosquitto.conf -v
- C:\Program Files\mosquitto> mosquitto.exe -c mosquitto.conf -v
- Login to your source camera.
- Select Setup > Event > MQTT > Client Setup section.
NOTE: Your camera does NOT support MQTT if it does not have an MQTT section. - Use the settings below in the MQTT > Client Setup screen.
- MQTT: Enable
- Address: This is the IP address of the pc running the Mosquitto application
- Port: This is the listener port from mosquitto.conf file
- Username: Your choice
- Transport Protocol: TCP
- Custom Client ID: Enable
- Client ID: Your choice
- Keep Alive Interval: 30
- Connect Timeout: 60
- Auto Reconnect: Enable
- Clean Session: Enable
-
Default Topic Prefix: Your choice
- Select MQTT > Publication/subscription and click Add on the Publication tab.
- Enter a Name, Topic, and Payload message.
- Select Event > Event Rule and click Add.
- Select an Event Trigger, and select the Name you created in step 8 under the MQTT drop-down.
- Click OK.
- On the PC where Mosquitto is installed, test the subscription. You must switch to the mosquitto directory to run the commands below.
Enter: mosquitto_sub.exe –h <Mosquitto server IP> –p [port] –t [topic] –i mosq_sub –c -d
Example:
C:\Program Files\mosquitto>Mosquitto_sub.exe -h 10.1.4.88 -p 1883 -t testpublish -i mosq_sub -c -d
Once MD is triggered, the camera publishes the topic you defined in step 8. You can see this in the mosquitto subscription test.
Other MQTT-enabled cameras or IoT devices can subscribe to the publication rule we have configured.
- Under the Event Trigger column, select the MQTT subscription, click on the Subscription drop-down, select your subscription, then click Apply.
- The MQTT subscription will update the camera's Event Log if no Event Action is selected.