On hyper-local web pages
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Transcript of On hyper-local web pages
![Page 1: On hyper-local web pages](https://reader031.fdocuments.in/reader031/viewer/2022030303/587c04341a28ab7c668b7383/html5/thumbnails/1.jpg)
On hyper-local web pages
Dmitry Namiot, Manfred Sneps-SneppeLomonosov Moscow State University,
Ventspils University College
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Network proximity
• A special model for context-aware services
• Context described as a set of wireless networks (nodes)
• Wi-Fi access points, Bluetooth nodes, Bluetooth tags
• Data could be directly associated with network nodes.
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Context
• Context is anything we can add to location• Models for context-aware systems:• Data exchange depending on the context• Situational awareness• Context-aware data discovery and data
search
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Network nodes
• Wi-Fi (Bluetooth) devices are everywhere• Wi-Fi (Bluetooth) is presented in every
mobile phone• Easy to measure (existing standards)• We can reuse existing infrastructure• There is no connection with location (geo-
coordinates)
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iBeacons
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Proximity-based services
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Information Service
• A set of rules:• Network fingerprint – > data chunks
(information)• Can use existing networks as well as
especially created wireless nodes
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Can we use it without applications ?
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Firefox OS
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Firefox OS
• This API is available on Firefox OS for internal applications only.
• This feature is not on a current W3C standards track
• Bluetooth API has got own interface• Can we separate connectivity and
availability?
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Proximity in HTML• IF (fingerprint) THEN { show content }• <div id=“Café” cond=“fingerprint”> Content• </div>• Web Intents• Local web-server• <script type=“text/javascript” src=
http://localhost:8080/proximity?f=callback• </script>
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WAP Proxy
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W3C Semantic Sensors• W3C Semantic Sensor Network Incubator Group (SSN-XG): • An ontology to describe sensors and their device, system and platform
related attributes. • A semantic markup and recommends methods to use ontology to
describe the data available based on the existing models such as the Open Geospatial Consortium’s (OGC) Sensor Web Enablement (SWE) standards:
• 1.Observations & Measurements Schema (O&M). It is the XML Schema for encoding observations and measurements from a sensor, both archived and real-time.
• 2.Sensor Model Language (SensorML). It is a set of standard models and XML Schema for describing sensors, systems and processes; provides information needed for discovery of sensors, location of sensor observations, processing of low-level sen- sor observations, and listing of their properties. Bluetooth node could be described as a ”standard” sensor with observable properties ”MAC-address” and ”RSSI”. In the terms of Sensor Ontology, it should be a simple element.
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W3C Semantic Sensors• 3.Transducer Markup Language (TransducerML or TML): the
conceptual model and XML Schema for describing transducers and supporting real-time streaming of data to and from sensor systems.
• 4.The Sensor Observations Service (SOS) provides a standard web service interface for requesting, filtering, and retrieving observations and sensor system information: the proxy between a client and an observation repository or near real-time sensor channel.
• 5.The Sensor Planning Service (SPS) is similar to SOS, but used for the management: provides a web service interface for requesting user-driven acquisitions and observations: the broker between a client and a sensor collection management environment.
• 6.The Sensor Alert Service (SAS) - provides a standard web service interface for publishing and subscribing to alerts from sensors.
• 7.The Web Notification Services (WNS) - provides a standard web service interface for asynchronous delivery of messages or alerts from SAS and SPS web services.
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W3C Web Applications WG• Create specifications that enable improved client-side
application development on the Web• APIs for client-side development and for markup
vocabularies for describing and controlling client-side application behavior.
• A part of the Rich Web Clients Activity in the W3C Interaction Domain:
• 1.Templates: chunks of the markup that are inert, but can be activated for use later.
• 2.Decorators: apply templates, based on CSS selectors• 3.Custom Elements: let authors (developers) define their
own elements, with new tag names and new script interfaces. There are so-called widgets.
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Widgets
• Widgets are defined as full-fledged client-side applications
• Widgets are authored using technologies such as HTML, then packaged for distribution and, typically, downloaded and installed on a client machine or device
• Could be run as standalone applications, and embedded into Web pages and run in a Web browser.
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W3C Ubiquitous Web Domain WG• Technologies to enable Web access for anyone, anywhere,
anytime, using any device: Web access from mobile phones as well as other emerging environments such as consumer electronics, interactive television, automobiles
• The Device APIs and Policy Working Group: client side programming interfaces and security polices to enable Web applications and widgets to access device services, including the calendar, contacts, camera, etc. Proximity Events interface:
• The DeviceProximityEvent interface provides web developers information about the distance between the hosting device and a nearby object.
• The UserProximityEvent interface provides web developers a user-agent and platform-specific approximation that the hosting device has sensed a nearby object.
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W3C Ubiquitous Web Domain WG• This is achieved by interrogating a proximity sensor of a device,
which is a sensor that can detect the presence of a physical object without physical contact.
• Not all devices contain a proximity sensor• Supports so-called proximity sensors. They can use radiation (e.g.,
an infrared light or a magnetic field), certain material properties can interfere with the sensor’s ability to sense the presence of a physical object.
• Conceptually, covers the network proximity too. But nobody threats wireless network nodes as potential things in proximity tasks.
• There is a sub-division of this group which targets Network API: declare the interest on the network connectivity only.
• The network proximity deserves a separate API. For example, there is an existing initiative for NFC related Web API, and we see no reasons why more widespread Bluetooth and Wi-Fi have not such development.
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Android Web View• As a workaround and prototype for this development, we
can present a custom WebView for Android.
• On Android platform is possible to access from JavaScript to Java code for a web page, loaded into WebView control.
• Java code will provide a list of nearby network nodes (calculate the network fingerprint).
• The key moment here is the need for an asynchronous call from JavaScript, because scanning for wireless networks in Java is the asynchronous process.
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Android Web View• On Android side we activate JavaScript interface:
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);WebView webView = new WebView(this); setContentView(webView);
WebSettings settings = webView.getSettings(); settings.setJavaScriptEnabled(true);webView.addJavascriptInterface(new MyJavascriptInterface(), ”Network”); }
• Now we can describe our Java code for getting network fingerprint. As a parameter, we will pass a name for callback function in JavaScript.
• @JavascriptInterfacepublic void getNetworks(final String callbackFunction) { }