Blackberry BROWSER VERSION 4.7.0 - FUNDAMENTALS GUIDE Основы - Страница 34

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Fundamentals Guide
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BlackBerry Internet Service Browsing: The BlackBerry Internet Service Browsing network gateway supports pushed content
delivery. Content is pushed to the BlackBerrydevice through web signals using a push/pull architecture. You can develop
a web signal to place an icon on the Home screen. The icon changes to notify the user that new content is available,
prompting the user to download the content.
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WAP network gateways: WAP network gateways support pushed content delivery, typically of SMS or UDP messages,
depending on the network. To support pushed content delivery through WAP network gateways, the WAP Push service
record must be provisioned on the BlackBerrydevice. WAP Push service records are typically provisioned when a
BlackBerrydevice is registered with the wireless service provider.

Pushed content supported by the BlackBerry MDS Connection Service

The BlackBerry® MDS Connection Service is designed to provide extensive support for pushing content or data to BlackBerry
devices. To push content to the BlackBerry device, you can develop server-side applications that make HTTP POST requests to
the BlackBerry MDS Connection Service. Requests include a list of the destination BlackBerry devices that are targeted to receive
the pushed content.
The BlackBerry MDS Connection Service sends the content to the appropriate BlackBerry devices using the users' email addresses.
The BlackBerry MDS Connection Service manages the connection to the wireless network and verifies that content is delivered
as soon as a user is in a wireless coverage area.
On the BlackBerry device, a separate browser listener thread listens on port 7874 for incoming messages and processes incoming
messages.
The BlackBerry MDS Connection Service supports the following content push protocols:
Content push protocol
RIM Push
WAP PAP Push
Supported push methods
Using the BlackBerry® MDS Connection Service, you can push content to the BlackBerry device using any of the following push
methods:
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Description
The RIM Push protocol sends the content as a byte stream to the destination
BlackBerry device to the port that is specified in the URL of the pushed message.
Pushed data can be stored in RAM on the BlackBerry MDS Connection Service
server or in the BlackBerry® Enterprise Server database.
The PAP protocol sends an HTTP POST request containing a PAP message. The
message is a MIME multipart message that includes the control entity and the
pushed content. The control entity is an XML document that specifies information
about the destination BlackBerry device address, message ID, delivery time stamps,
and so on.
Pushed content delivery