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Chapter 22: Wireless Wide-Area Networking

Windows CE 5.0 Connection

206 Psion Teklogix Mobile Devices SDK Developers Guide

Figure 22.1 Interaction Between Psion Teklogix WWAN And Windows Components

The WWAN functions in the Mobile Devices SDK provide extra features that are needed by a

WWAN connection, but not by an Ethernet or dial-up connection. These features include the

ability to:

• Query the radio signal strength

• Select one of several available networks

The Wireless Manager applet in the Control Panel allows you to configure settings for the WWAN

connection. This gives access to many of the WWAN driver functions, without the necessity of

writing code. This includes activities such as querying the signal strength. The Wireless Manager

applet uses RAS to connect and disconnect WWAN connections.

22.6.1 Windows CE 5.0 Connection

Windows CE 5.0 provides the RAS (Remote Access Service) API for making Internet connec-

tions. An application can use the Windows RAS API to set up and tear down a WWAN

connection.

See also “The DbGprs.csv File” on page 209

for information that may need to be provided to com-

plete the connection.

NDIS

WWAN NDIS-WAN

Miniport driver

Virtual serial port

Serial driver

WWAN modem

PPP

TCP/UDP

Winsock API

Packets

Application using Psion Teklogix Mobile Devices SDK

RAS

RAS API

NdisUio2

WWAN API

WWAN Control Panel

user interface