如何实现Edgex设备服务

2 min read

加载设备配置文件

device-sdk-go:
service.init.go:   
       driver.Initialize
             initializeOnvifClient
                onvif4go.NewOnvifDevice.Initialize()
       provision.LoadProfiles(ds.config.Device.ProfilesDir, dic)
       provision.LoadDevices

驱动服务客户端初始化与核心数据和命令服务

clients.BootstrapHandler -> InitDependencyClients

// InitDependencyClients triggers Service Client Initializer to establish connection to Metadata and Core Data Services
// through Metadata Client and Core Data Client.
// Service Client Initializer also needs to check the service status of Metadata and Core Data Services,
// because they are important dependencies of Device Service.
// The initialization process should be pending until Metadata Service and Core Data Service are both available.

驱动

func (d *Driver) Initialize     ->    loadCameraConfig

diff --git a/internal/driver/driver.go b/internal/driver/driver.go

@@ -388,7 +389,7 @@ func (d *Driver) Initialize(lc logger.LoggingClient, asyncCh 
-
+       debug.PrintStack()

runtime/debug.Stack()
        C:/local/go/src/runtime/debug/stack.go:24 +0x7a
runtime/debug.PrintStack()
        C:/local/go/src/runtime/debug/stack.go:16 +0x19
github.com/edgexfoundry/device-camera-go/internal/driver.(*Driver).Initialize(0xc00034fa00, {0x14495f0, 0xc0003714a0}, 0xc000480060, 0x0)        
        D:/code/go/src/github.com/edgexfoundry/device-camera-go/internal/driver/driver.go:392 +0xc7
github.com/edgexfoundry/device-sdk-go/v2/pkg/service.(*Bootstrap).BootstrapHandler(0xc0000d26e0, {0x14408d8, 0xc00036b0c0}, 0xc000388680, {{0xc08
38af7a5288f3c, 0xf37d35, 0x17238c0}, 0xdf8475800, 0x3b9aca00}, 0xc00034fa80)
        D:/code/go/pkg/mod/github.com/edgexfoundry/device-sdk-go/[email protected]/pkg/service/init.go:55 +0x62d
github.com/edgexfoundry/go-mod-bootstrap/v2/bootstrap.RunAndReturnWaitGroup({0x14408d8, 0xc00036b0c0}, 0xc0003827f0, {0x1446b90, 0xc000351500}, {
0x13d7f8f, 0xd}, {0x13d868d, 0xe}, {0x1445710, ...}, ...)
        D:/code/go/pkg/mod/github.com/edgexfoundry/go-mod-bootstrap/[email protected]/bootstrap/bootstrap.go:158 +0xa33
github.com/edgexfoundry/go-mod-bootstrap/v2/bootstrap.Run({0x14408d8, 0xc00036b0c0}, 0xc0003827f0, {0x1446b90, 0xc000351500}, {0x13d7f8f, 0xd}, {
0x13d868d, 0xe}, {0x1445710, ...}, ...)
        D:/code/go/pkg/mod/github.com/edgexfoundry/go-mod-bootstrap/[email protected]/bootstrap/bootstrap.go:184 +0x19c
github.com/edgexfoundry/device-sdk-go/v2/pkg/service.Main({0x13d7f8f, 0xd}, {0x13e0370, 0x1a}, {0x1391bc0, 0xc00034fa00}, {0x14408d8, 0xc00036b0c
0}, 0xc0003827f0, 0xc0002c1bc0)
        D:/code/go/pkg/mod/github.com/edgexfoundry/device-sdk-go/[email protected]/pkg/service/main.go:66 +0x9b3
github.com/edgexfoundry/device-sdk-go/v2/pkg/startup.Bootstrap({0x13d7f8f, 0xd}, {0x13e0370, 0x1a}, {0x1391bc0, 0xc00034fa00})
        D:/code/go/pkg/mod/github.com/edgexfoundry/device-sdk-go/[email protected]/pkg/startup/bootstrap.go:19 +0x11a
main.main()
        D:/code/go/src/github.com/edgexfoundry/device-camera-go/cmd/main.go:22 +0x4c

OnvifClient

onvif4go

ONVIF网络视频设备

ONVIF提供一系列被清楚定义的网络服务给符合ONVIF标准的设备及客户。此外，一些条件功能只能在特定的产品中才能实现。例如要实现摄像机的PTZ功能，必须要在接口处提供特定的支持服务才可以实现，可选的服务也都须被定义。产品必须详细说明所支持的服务及功能。在开发上非常简便，软件客户端可以查询符合ONVIF标准的设备，获取产品的服务与功能列表。例如图像服务是可选受理的服务，客户端可以通过设备管理服务的“能力获取”（GetCapabilities）查询该服务的可用性。这意味着集成商可以在软件中自动侦测产品所支持的服务及功能

device-usb-camera

wget https://raw.githubusercontent.com/pimlie/ubuntu-mainline-kernel.sh/master/ubuntu-mainline-kernel.sh

ubuntu-mainline-kernel.sh -i v5.10.0

wget http://launchpadlibrarian.net/520233550/linux-libc-dev_5.10.0-14.15_amd64.deb
dpkg -i linux-libc-dev_5.10.0-14.15_amd64.deb

sudo  dpkg-query -L linux-libc-dev | grep videodev2.h
/usr/include/linux/videodev2.h

export EDGEX_SECURITY_SECRET_STORE=false

device profile for OnvifSnapshot

deviceResources:
  - name: "OnvifSnapshot"
      description: "snapshot from first ONVIF MediaProfile"
      properties:
        valueType: "Binary"
        readWrite: "R"
        mediaType: "image/jpeg"
deviceCommands:
  - name: "OnvifSnapshot"
    isHidden: false
    readWrite: "R"
    resourceOperations:
      - { deviceResource: "OnvifSnapshot" }

http://:59985/api/v2/device/name/Camera001/OnvifSnapshot

下载的文件为CBOR编码。

IOT

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