MQTT-Simulator

MQTT simulator for some basic elements like thermometers, cameras or some actuators.

You can configure your simulation with config.json file or in the actual program in the table. There is a possibility to change the broker IP address and port, add/remove devices and change them at runtime.

You will need to install PyQT5 with sudo apt-get install python3-pyqt5 or with pip install PyQt5 Or you can run pip install -r requirements.txt to install all the required packages for both simulators

Arguments:

• -n --no-ui - will run this script without showing the UI (for terminal usage)
• -h --help - shows the help message and ends the script with code 1
• -c --config - sets the configuration file(json format) that should be used for the app. Default "config.json".

Configuration file example (JSON format)

{
    "broker": "192.168.1.100",
    "broker-port": 1883,
    "mqtt_devices": [
        {
            "device_type": "thermometer",
            "images_dir": "None",
            "json_dir": "None",
            "name": "Teplomer pokoj",
            "publish_time": 1000,
            "subscribe": 0,
            "topic": "home/living-room/temperature",
            "type": "value",
            "value": "20",
            "value_low": "15",
            "value_top": "25"
        },
        {
            "device_type": "camera",
            "images_dir": "images",
            "json_dir": "None",
            "name": "Kamera vstup",
            "publish_time": 0,
            "subscribe": 0,
            "topic": "home/entry/camera",
            "type": "image",
            "value": "None",
            "value_low": "None",
            "value_top": "None"
        },
        {
            "device_type": "humidity meter",
            "images_dir": "None",
            "json_dir": "None",
            "name": "Vlhkomer lo\u017enice",
            "publish_time": 1000,
            "subscribe": 0,
            "topic": "home/bedroom/humidity",
            "type": "value",
            "value": "30",
            "value_low": "45",
            "value_top": "70"
        }
    ]
}

Device configuration description

• device_type - type of device like thermometer or camera. Just for organization.
• images_dir - path to the directory from where the images should be taken from. Relevant only when the type is set to "image".
• json_dir - path to the directory from where the json files should be taken from. Relevant only when the type is set to "json".
• name - name of the device, just for organization.
• publish_time - time interval that specifies how often the message should be published. Format is in milliseconds.
• subscribe - if this value is set to the 1 the device will update the value field if some message is published to the topic. The value 0 is changed to No and 1 is changed to Yes.
• topic - the topic associated with the device.
• type - type of message that will be send. Possible types are "value", "image", "json".
• value - current value presented on the device. This field is used only if the type is set to "value". After this field is changed in the UI message will be published to the associated topic.
• value_low - this field is the lowest value that can be published to the topic associated with the device. Only relevant if the type is set to "value".
• value_top - this field is the highest value that can be published to the topic associated with the device. Only relevant if the type is set to "value". value_low and value_top sets the borders. Every time the message of the device with type value should be published, random value between these borders will be published.

Known bugs

If you want to remove the device you will need to select cell of the device you want to remove.

(Bug) - After the device is removed the app will be restarted for simplicity (UI only)

(Bug) - If you start the script with all the publish_time set to 0 you will need to restart the app after any of the publish_time is set to non zero value. If there is any device with a non zero publish_time you don't have to restart after setting the publish_time on any other device.

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MQTT Camera Simulator

Script to simulate a security camera with a default system camera.

This script will work with Raspberry Pi that has CSI or USB camera. Also, it can work with an ordinary laptop with a webcam.

Arguments:

• -a --address - MQTT broker IP address. The camera image will be send to this broker. Default: 127.0.0.1
• -p --port - MQTT broker port. Default: 1883
• -u --update - Camera image update time in seconds. Default: 1 second
• -t --topic - Topic that will define the camera image on broker. Default: home/living-room/camera

Example: python cameraToMQTT.py --address 192.168.1.150 --port 1990 --update 10 --topic "home/bedroom/camera"