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Chapter 19: Wireless Wide-Area Networking
Using SMS (Short Message Service)
Psion Mobile Devices Developers Guide
214
19.11 Using SMS (Short Message Service)
SMS (Short Message Service) is available on GSM networks. It allows text messages of up to 160 characters
to be sent and received through the network operator’s SMS gateway. If the receiver is powered off or out
of range, messages are stored in the network and delivered at the first opportunity.
On Psion systems, SMS messages are stored on a SIM card, or in the WWAN modem. At startup, initializa-
tion of the SIM card takes more time than initialization of the modem.
When callbacks are used to track initialization, typically the application is notified of the ready status of the
modem, and then some time later it is notified of the ready status of the SIM card. Only then are the SMS
functions available. Some modems do not support SMS; in these cases the SMS ready status never occurs.
Incoming SMS messages are stored on one or several mailboxes. The mailbox is a logical entity. The mail-
boxes are numbered sequentially—the mailbox index—starting from 0 (zero) for the first mailbox. Within
each mailbox the messages are numbered sequentially—the message index.
Some mailboxes are writable, this means that sent messages can be stored in the mailbox.
When SMS functions are called, an SMS location structure is passed in as a parameter. The SMS location
structure holds the mailbox index and the message index within the mailbox.
If a callback is registered for incoming SMS messages, a location structure is returned by the callback that
specifies the mailbox index and the message index. This location structure can be passed to subsequent
SMS calls that process the incoming SMS message. It is recommended that applications query the location
of each message, and not make assumptions about where the modem put the message.
Most modems have only one mailbox that is stored on the SIM card. A few modems have a second mailbox
that is stored in the modem itself. The Mobile Devices SDK provides information on the number and struc-
ture of the mailboxes. Normally, the modem automatically selects the mailbox for an incoming message.
When one mailbox is full, the modem starts filling the next one. To make mailboxes portable between
hand-held computers, an application can force a mailbox to be on the SIM card.
19.11.1 SMS API Elements
C++: SMS on Windows CE-based computers is controlled using the PsionTeklogix::WWAN namespace.
Java: Not available.
.NET: SMS on Windows CE-based computers is controlled using the PsionTeklogix.WWAN namespace.
19.12 WWAN Supplementary Services
Some WWAN networks support supplementary services. These services can complement both voice calls
and data services. Setting and querying each supplementary service takes between 30 and 60 seconds, as
the computer must contact the WWAN network and wait for a reply. The Mobile Devices SDK provides
access to the following supplementary services, if they are supported by your WWAN network:
Incall Supplementary Services
Call Hold
This service enables the subscriber to interrupt an ongoing call and then subsequently re-establish the call.
The call hold service is only applicable to normal telephony.
Call Waiting
This service allows the mobile subscriber to be notified of an incoming call during a call. The subscriber can
answer, reject, or ignore the incoming call. Call waiting is applicable to all GSM telecommunications services
using a circuit-switched connection.
Multiparty Service (Conference Calls)
The multiparty service enables a mobile subscriber to establish a multiparty conversation—that is, a simul-
taneous conversation between from three to six subscribers. This service is only applicable to
normal telephony.
- MOBILE DEVICES 1
- TA B L E O F 5
- CONTENTS 5
- Chapter 4: Reset 6
- Chapter 5: Display 6
- Chapter 6: Indicators 6
- Chapter 8: Peripherals 6
- Chapter 9: Card Slots 7
- Chapter 10: Serial Ports 7
- Chapter 13: Scanners 7
- Chapter 14: Audio 8
- Chapter 16: Windows Shell 9
- Chapter 17: Trigger Control 9
- Table of Contents 10
- Chapter 21: GPS 11
- Chapter 22: Sensors 11
- Chapter 23: Other Features 12
- Appendices 12
- Appendix A: Resources 12
- Appendix B: Registry Keys 12
- INTRODUCTION 13
- 1.1 About This Manual 14
- 1.2 Text Conventions 15
- 1.3 Non-Psion Computers 15
- Chapter 1: Introduction 16
- BACKLIGHT 17
- 2.1 Backlighting 19
- 2.5 Backlight API Elements 25
- BATTERIES AND POWER 27
- MANAGEMENT 27
- 3.1 Suspend Timeout 29
- 3.2 Psion Power States 30
- 3.2.7 Power Off 31
- 3.6.1 Initiation of Suspend 34
- 3.9 Suspend API Elements 35
- 3.10 Power Management 35
- 3.11 Battery Information 36
- 3.11.3 Smart Batteries 37
- 4.1 Reset Types and Effects 41
- Chapter 4: Reset 42
- Reset Types and Effects 42
- 4.5 Code Samples for Resets 47
- 4.6 Reset API Elements 47
- DISPLAY 5 49
- 5.1 Display 51
- 5.4 Display API Elements 53
- INDICATORS 55
- 6.1 Indicators 57
- 6.2 Using LED Colours 57
- 6.3 Controlling Pulses 58
- 6.7 Indicator API Elements 58
- KEYBOARD AND 59
- KEYBOARD REMAPPING 59
- 7.1 Key b o a rd 61
- 7.1.2 Disabling The Keyboard 62
- 7.2 Keyboard Remapping 63
- 7.2.1 ORANGE Key and SYM Key 64
- Function Description 65
- 7.3 Key Insertion 71
- Key Insertion API Elements 72
- PERIPHERALS 73
- 8.1 Overview 75
- 8.2 Definition of Terms 75
- 8.3 Events 75
- 8.4 Docking Station 75
- 8.5 Tether Ports 76
- Chapter 8: Peripherals 77
- CARD SLOTS 79
- 9.1 Card Slots 81
- Chapter 9: Card Slots 84
- SERIAL PORTS 85
- 10.1 Overview 87
- Port Assignments 89
- 10.9 Java 90
- Chapter 10: Serial Ports 91
- Serial Port API Elements 91
- PERMANENT STORAGE 93
- 11.1 Permanent Storage 95
- RAS (REMOTE ACCESS 97
- SERVICE) 97
- 12.1 Overview 99
- 12.3 RAS Architecture 100
- 12.5 Getting Started with RAS 100
- 12.6 Code Samples for RAS 100
- 12.7 RAS API Elements 101
- SCANNERS 103
- 13.1 Types Of Scanners 105
- 13.2 External Scanners 105
- Chapter 13: Scanners 106
- 13.3 Internal Scanners 107
- 13.4 Symbologies 109
- 13.5 Configuring Scanners 110
- Decoded Laser Scanner Options 116
- Scanner setting key = Decoded 116
- 13.6.2 Code 39 Settings 120
- 13.6.3 Trioptic Code Settings 122
- 13.6.4 Code 128 Settings 123
- 13.6.5 EAN 13 Settings 125
- 13.6.6 EAN 8 Settings 127
- 13.6.7 UPC A Settings 129
- 13.6.8 UPC E Settings 131
- 13.6.10 Codabar Settings 135
- 13.6.11 Code 93 Settings 137
- 13.6.12 Code 11 Settings 139
- 13.6.14 MSI Plessey Settings 143
- 13.6.17 IATA 2 of 5 Settings 147
- 13.6.18 Telepen Settings 148
- 13.6.20 PosiCode Settings 152
- 13.6.21 Composite Codes 152
- 13.6.22 TLC-39 Settings 154
- 13.6.23 PDF417 Settings 155
- 13.6.25 Code 16K Settings 157
- 13.6.26 Code 49 Settings 158
- 13.6.27 Codablock Settings 158
- 13.6.29 2D QR Code Settings 160
- 13.6.30 2D MaxiCode Settings 161
- 13.6.31 2D Aztec Settings 162
- 13.6.37 Postal - Kix Settings 167
- 13.7 Reading Bar Codes 171
- 13.8 Scanner Events 172
- AUDIO 14 173
- 14.1 Sound Hardware 175
- 14.6 Sound API Elements 176
- 14.7 Microphone 177
- 14.8 Audio Input 177
- 14.9 Audio Input API Elements 178
- SYSTEM INFORMATION 179
- 15.1 System Information 181
- 15.2 Machine Type 181
- 15.3 Model 181
- 15.5 Psion Build Codes 181
- 15.6 Psion Version Numbers 182
- WINDOWS SHELL 185
- 16.1 Windows Shell 187
- 16.2 Setting Windows Security 187
- TRIGGER CONTROL 189
- 17.1 Overview 191
- 17.2 Definition Of Terms 191
- 17.4 Trigger Source IDs 191
- 17.5 Trigger Associations 192
- 17.6 Double-Clicks 192
- 17.7 Events 193
- WIRELESS LOCAL-AREA 195
- NETWORKING 195
- 18.2 Supplicants 197
- 18.2.1 Namespaces 198
- 18.3 Configuring WLAN Radios 199
- 18.4 Authentication Modes 199
- 18.6.2 Encryption Modes 201
- 18.8 Summit Radio Features 202
- 18.11 Ad hoc Networks 203
- 18.12 Getting Started 203
- 18.13 Code Samples 203
- 18.14 WLAN API Elements 204
- WIRELESS WIDE-AREA 205
- 19.4 Supported WWAN Modems 208
- 19.4.2.2 Configuration 209
- 19.4.2.3 AT Commands 209
- 19.4.4 Packet Data 211
- 19.4.6 GSM Power Driver 211
- 19.5 Initializing WWAN 212
- WWAN Driver Status Flags 213
- Initializing the WWAN Driver 215
- 19.6 Closing WWAN 217
- Connecting to the Internet 218
- 19.7.3 The DbGprs.csv File 221
- 19.7.5 Roaming 222
- 19.8 Access Flags 223
- 19.10 WWAN API Elements 225
- 19.11.1 SMS API Elements 226
- 19.13 Voice Calls on a WWAN 227
- 19.13.1 Initializing WWAN 228
- Initializing Voice Over WWAN 229
- 19.13.4 Making a Phone Call 230
- 19.13.5 Voice Call States 231
- Voice Call States 232
- Receiving a Phone Call 233
- Processing Voice Calls 234
- Terminating Voice Calls 235
- 19.13.9 Call Forwarding 236
- Audio for Voice Over WWAN 237
- 19.14 Phone Books 238
- 19.14.2 Phone Book Types 239
- 19.15 Resource Materials 240
- REGISTRY-BASED WWAN 241
- 20.1 Overview 243
- 20.2.3 Network Status 245
- 20.2.4 Packet Data Status 245
- 20.2.5 Voice Call Status 246
- 20.5 Sample Source Code 248
- Sample Source Code 249
- 21.1.1 Built-in GPS 255
- 21.1.2 End-cap GPS 255
- 21.1.3 External GPS 255
- 21.3 GPS Configuration 256
- 21.4 Processing GPS Data 256
- 21.5 Getting Started with GPS 256
- 21.6 Code Samples for GPS 256
- 21.7 GPS API Elements 256
- SENSORS 22 257
- 22.1 Introduction 259
- 22.2 Accelerometer 259
- 22.3 Gyroscope 259
- ±9 milli-degrees per second 260
- ±4 gauss 260
- 22.5 Light Sensor 261
- 22.6 Proximity Sensor 261
- Chapter 22: Sensors 262
- OTHER FEATURES 263
- 23.1 Vibration 265
- 23.3 PsionVU 266
- APPENDIX: RESOURCES 267
- Manuals and URLs 268
- APPENDIX: REGISTRY 271
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