device_camera

README

Camera Device Service

About

The EdgeX Camera Device Service is developed to control/communicate ONVIF-compliant cameras accessible via http in an EdgeX deployment

Tested Devices

The following devices have been tested in a development environment, but ONVIF-compliant cameras should be compatible.

• Wisenet XND-6080RV
• Bosch NBN-832V-IP
• Hikvision DS-2CD2342WD-I

Dependencies

This device service is built using the onvif4go library. It provides a developer-friendly ONVIF client to use with ONVIF-compliant cameras.

Build Instructions

1. Clone the device-camera-go repo with the following command:

    git clone https://github.com/edgexfoundry/device-camera-go.git
   

2. Build a docker image by using the following command:

    docker build . -t device-camera-go
   

3. Alternatively the device service can be run natively with make build and the ./run.sh script.

By default, the configuration and profile files used by the service are available in the 'cmd/res' folder. Notably, the configuration.toml file cmd/res should be changed to reflect the correct device profile and host/IP address for the camera(s). The configuration-drive.toml file in the same directory should be updated with the camera's access credentials.

Notes

Parameters for PUT commands

EdgeX Put commands (as-of writing) take a single parameter. For commands like "create a user" or "set the device system time", this is problematic. To workaround this limitation, the device service expects the parameters for several of the PUT commands to be a single string value containing string-escaped JSON. Some examples:

{"OnvifDateTime": 
    "{
        \"Hour\":21,
        \"Minute\":35,
        \"Second\":6,
        \"Year\":2019,
        \"Month\":10,
        \"Day\":4
    }"
}

{"OnvifUser":
    "{
        \"Username\":\"newadmin2\", 
        \"Password\":\"newadmin234\", 
        \"UserLevel\":\"Operator\"
    }"
}

Removing a Device from EdgeX

During the course of testing or deployment you may end up with EdgeX devices in the system that you want to remove. With this device service potentially starting listener goroutines for its devices, this becomes more relevant.

To remove devices from EdgeX:

1. Issue a request to the EdgeX core metadata service to get the Names for all devices.

    GET http://edgex-core-metadata:59881/api/v2/device/all
   

2. Issue a request to the EdgeX core metadata service to delete a device by ID.

    DELETE http://edgex-core-metadata:59881/api/v2/device/name/{{device_name_here}}
   

This will remove the device from EdgeX and, as long as it does not remain in the device list inside this device service's configuration.toml file, will prevent this device service from attempting to initialize the device at startup.

Example Usage

There are many ways to interact with this device service. This example shows how to emit a snapshot image from your camera at regular intervals by leveraging EdgeX device service auto events.

1. For this example we will run this in a docker container, so modify the pre-defined devices found here to add your IP camera device. Note that at a minimum you must populate the Address value using the correct IP address for your device.

   # Pre-defined Camera Device(s)
   [[DeviceList]]
   # Unique device name
   Name = "CasualWatcher001"
   # Using default ONVIF camera profile
   Profile = "camera"
   # Human friendly description
   Description = "Camera on east wall facing the loading dock."
   [DeviceList.Protocols]
       [DeviceList.Protocols.HTTP]
       Address = "10.22.34.144"
   # Emit a CBOR-encoded image from this camera, as an EdgeX event, every 30 seconds
   [[DeviceList.AutoEvents]]
       Interval   = "30s"
       OnChange   = false
       SourceName = "onvif_snapshot"
   

2. Build docker image named edgexfoundry/device-camera-go:0.0.0-dev.

   make docker
   

3. Generate compose file with device-camera added by running following commands:

   git clone https://github.com/edgexfoundry/edgex-compose.git
   git checkout <release-branch> # i.e. hanoi
   cd compose-builder/
   make gen no-secty ds-camera
   

4. Launch the service using docker-compose up device-camera. You should see informational log entries of CBOR events being emitted after 30 seconds, and each 30 seconds thereafter.

   device-camera     | level=INFO msg="Device Service device-camera-go exists"
   device-camera     | level=INFO msg="*Service Start() called, name=device-camera-go, version=1.0.0"
   device-camera     | level=INFO msg="Listening on port: 59985"
   device-camera     | level=INFO msg="Service started in: 65.358268ms"
   device-camera     | level=INFO Content-Type=application/cbor correlation-id=a452e6b5-75b0-46c5-8558-a1c07269bf42 msg="SendEvent: Pushed event to core data"
   device-camera     | level=INFO Content-Type=application/cbor correlation-id=45e53484-6a7e-41e6-9fd5-794f8a002819 msg="SendEvent: Pushed event to core data"
   

Integrate Into Applications

Refer to simple-cbor-filter, update the ValueDescriptors in res/configuration.toml and run the example:

[ApplicationSettings]
ValueDescriptors = "onvif_snapshot"

Documentation

Index

• Variables

Variables

var Version string = "to be replaced by makefile"

Global version for device-sdk-go