This manual provides instructions for developers who want to use the Unwired Planet SDK (UP.SDK) to create services for the UP.LinkTM platform.
The UP.Link platform provides owners of data-capable handheld devices, such as wireless phones, with wireless access to a wide array of services. These services include, but are not limited to, many of the services available on the Internet.
An UP.Link-enabled handheld device, or UP.Phone, connects to World Wide Web servers through a system called an UP.Link server. The UP.Phone functions much like a Web browser; the user presses keys on the UP.Phone to navigate and request URLs. The UP.Phone uses the data capabilities of conventional wireless networks to send the requests to an UP.Link server, which converts them into Hypertext Transport Protocol (HTTP) requests.
The UP.Link server sends HTTP requests over the Internet or direct lines to Web servers maintained by Unwired Planet or third-party developers. The applications on these Web servers that handle UP.Link requests are called HDML services. HDML services respond to the requests using Handheld Device Markup Language (HDML), an open language developed by Unwired Planet to interactively display information on small handheld devices. When an UP.Link server receives a response from an HDML service, it relays it back to the UP.Phone that originated the request. The UP.Phone displays the response to the user.
HDML services can also initiate communication with a user, by "pushing" alerts and information to an UP.Link, which pushes them to the user's UP.Phone. This process is called notification.