onvif camera discovery

cam.js

Cam {
  hostname: '192.168.0.4',
  username: undefined,
  password: undefined,
  port: 80,
  path: '/onvif/device_service',
  timeout: 120000,
  agent: false,
  preserveAddress: false,
  events: {},
  timeShift: -891,
  capabilities:
   { device:
      { XAddr: 'http://192.168.0.4/onvif/device_service',
        network: [Object],
        system: [Object],
        IO: [Object],
        security: [Object] },
     events:
      { XAddr: 'http://192.168.0.4/onvif/Events',
        WSSubscriptionPolicySupport: true,
        WSPullPointSupport: true,
        WSPausableSubscriptionManagerInterfaceSupport: true },
     imaging: { XAddr: 'http://192.168.0.4/onvif/Imaging' },
     media:
      { XAddr: 'http://192.168.0.4/onvif/Media',
        streamingCapabilities: [Object] },
     PTZ: { XAddr: 'http://192.168.0.4/onvif/PTZ' },
     extension: { deviceIO: [Object] } },
  uri:
   { ptz:
      Url {
        protocol: 'http:',
        slashes: true,
        auth: null,
        host: '192.168.0.4',
        port: null,
        hostname: '192.168.0.4',
        hash: null,
        search: null,
        query: null,
        pathname: '/onvif/PTZ',
        path: '/onvif/PTZ',
        href: 'http://192.168.0.4/onvif/PTZ' },
     media:
      Url {
        protocol: 'http:',
        slashes: true,
        auth: null,
        host: '192.168.0.4',
        port: null,
        hostname: '192.168.0.4',
        hash: null,
        search: null,
        query: null,
        pathname: '/onvif/Media',
        path: '/onvif/Media',
        href: 'http://192.168.0.4/onvif/Media' },
     imaging:
      Url {
        protocol: 'http:',
        slashes: true,
        auth: null,
        host: '192.168.0.4',
        port: null,
        hostname: '192.168.0.4',
        hash: null,
        search: null,
        query: null,
        pathname: '/onvif/Imaging',
        path: '/onvif/Imaging',
        href: 'http://192.168.0.4/onvif/Imaging' },
     events:
      Url {
        protocol: 'http:',
        slashes: true,
        auth: null,
        host: '192.168.0.4',
        port: null,
        hostname: '192.168.0.4',
        hash: null,
        search: null,
        query: null,
        pathname: '/onvif/Events',
        path: '/onvif/Events',
        href: 'http://192.168.0.4/onvif/Events' },
     device:
      Url {
        protocol: 'http:',
        slashes: true,
        auth: null,
        host: '192.168.0.4',
        port: null,
        hostname: '192.168.0.4',
        hash: null,
        search: null,
        query: null,
        pathname: '/onvif/device_service',
        path: '/onvif/device_service',
        href: 'http://192.168.0.4/onvif/device_service' },
     deviceIO:
      Url {
        protocol: 'http:',
        slashes: true,
        auth: null,
        host: '192.168.0.4',
        port: null,
        hostname: '192.168.0.4',
        hash: null,
        search: null,
        query: null,
        pathname: '/onvif/DeviceIO',
        path: '/onvif/DeviceIO',
        href: 'http://192.168.0.4/onvif/DeviceIO' } },
  profiles:
   [ { '$': [Object],
       name: 'profile0_0',
       videoSourceConfiguration: [Object],
       videoEncoderConfiguration: [Object],
       videoAnalyticsConfiguration: [Object],
       PTZConfiguration: [Object] },
     { '$': [Object],
       name: 'profile0_1',
       videoSourceConfiguration: [Object],
       videoEncoderConfiguration: [Object],
       videoAnalyticsConfiguration: [Object],
       PTZConfiguration: [Object] } ],
  videoSources:
   [ { '$': [Object],
       framerate: 15,
       resolution: [Object],
       imaging: [Object] } ],
  defaultProfiles:
   [ { '$': [Object],
       name: 'profile0_0',
       videoSourceConfiguration: [Object],
       videoEncoderConfiguration: [Object],
       videoAnalyticsConfiguration: [Object],
       PTZConfiguration: [Object] } ],
  activeSources:
   [ { sourceToken: 'VideoSource0',
       profileToken: 'profile0_0',
       encoding: 'H264',
       width: 1920,
       height: 1080,
       fps: undefined,
       bitrate: 1280,
       ptz: [Object] } ],
  defaultProfile:
   { '$': { fixed: true, token: 'profile0_0' },
     name: 'profile0_0',
     videoSourceConfiguration:
      { '$': [Object],
        name: 'VideoSourceConfiguration0',
        useCount: 2,
        sourceToken: 'VideoSource0',
        bounds: [Object] },
     videoEncoderConfiguration:
      { '$': [Object],
        name: 'VideoEncoderConfiguration0_0',
        useCount: 1,
        encoding: 'H264',
        resolution: [Object],
        quality: 5,
        rateControl: [Object],
        H264: [Object],
        multicast: [Object],
        sessionTimeout: 'PT30M' },
     videoAnalyticsConfiguration:
      { '$': [Object],
        name: 'video_analytics_config0',
        useCount: 1,
        analyticsEngineConfiguration: [Object],
        ruleEngineConfiguration: [Object] },
     PTZConfiguration:
      { '$': [Object],
        name: 'ansjer_ptz_0',
        useCount: 2,
        nodeToken: 'ansjer_ptz_0',
        defaultContinuousPanTiltVelocitySpace:
         'http://www.onvif.org/ver10/tptz/PanTiltSpaces/VelocityGenericSpace',
        defaultContinuousZoomVelocitySpace:
         'http://www.onvif.org/ver10/tptz/ZoomSpaces/VelocityGenericSpace',
        defaultPTZTimeout: 'PT10S' } },
  activeSource:
   { sourceToken: 'VideoSource0',
     profileToken: 'profile0_0',
     encoding: 'H264',
     width: 1920,
     height: 1080,
     fps: undefined,
     bitrate: 1280,
     ptz: { name: 'ansjer_ptz_0', token: 'ansjer_ptz_0' } } }