User Manual
Table Of Contents
- Access Server
- Table of Contents
- List of Tables
- Chapter 1. Introduction to Access Server
- Chapter 2. Getting Started with Access Server
- Chapter 3. Using the System
- 3.1. Network Interfaces
- 3.2. Bluetooth
- 3.3. Compact Flash Cards
- 3.4. USB Memory Dongles and Compact Flash Memory Cards
- 3.5. Servers
- 3.5.1. Finder
- 3.5.2. ObexSender
- 3.5.3. SMS Gateway Server
- 3.5.4. User Level Watchdog
- 3.5.5. Remote Management
- 3.5.5.1. Overview
- 3.5.5.2. Management Packet Format
- 3.5.5.3. Management Packet Information File Format
- 3.5.5.4. Management Operation Example: Hello World
- 3.5.5.5. Management Operation Example: Software Update
- 3.5.5.6. Management Operation Example: IPQUERY
- 3.5.5.7. Management with USB Memory Dongle or Compact Flash Memory Card
- 3.5.6. FTP
- 3.5.7. Web Server
- 3.5.8. SNMP
- 3.5.9. OpenVPN
- 3.5.10. SSH
- 3.5.11. Telnet
- 3.5.12. NTP
- 3.6. Utilities
- 3.7. Real Time Clock
- 3.8. Time Zone
- 3.9. System ReInstall and Upgrade
- Chapter 4. SPPoverIP
- Chapter 5. Obexsender
- Chapter 6. Software Development Kit
- 6.1. Introduction to SDK
- 6.2. Installing SDK
- 6.3. Creating Applications
- Chapter 7. iWRAP Bluetooth Interface
- 7.1. Terms
- 7.2. Starting the iWRAP Servers
- 7.3. Writing iWRAP Applications
- 7.4. Commands Controlling iWRAP
- INFO
- QUIT
- SET
- SAVE
- LOAD
- PING
- PONG
- ECHO
- LOCK
- UNLOCK
- SHUTDOWN
- SLEEP
- 7.5. Finding Bluetooth Devices
- INQUIRY
- NAME
- 7.6. Making a Bluetooth Connection
- CALL
- CONNECT
- NO CARRIER
- RING
- RINGING
- CLOSE
- LIST
- STATUS
- 7.7. Service Discovery
- SDPSEARCH
- SDPATTR
- SDPQUERY
- SDP bdaddr
- SDP ADD
- SDP DEL
- SDP LIST
- 7.8. Example Sessions
- 7.9. Error Codes
- Chapter 8. I/O API
- Chapter 9. Advanced Use Cases for Access Server
- Chapter 10. Certification Information and WEEE Compliance
- Appendix A. Directory Structure
- Appendix B. Setup Options
- Appendix C. Open Source Software Licenses
- Appendix D. Supported Hardware
Chapter 4. SPP-over-IP
requires that Access Server is equipped with a working GSM/GPRS compact flash card. See
Appendix D for supported cards.
Figure 4-3. SPP-over-IP over GPRS
Notice when using GPRS:
• Data upload rate is around 8-12kbps (depending on GPRS card)
• Data download rate is around 32-48kbps (depending on GPRS card)
• Data transmission delays can be very high, sometimes even seconds
• GPRS connection may be unreliable and break easily. This should be taken account when
designing the system. If GPRS connection breaks, all the TCP and Bluetooth connections will
also be closed.
4.1.4. Opening Connections from Access Server
In the basic SPP-over-IP use case, Access Server is in passive mode and only accepts incom-
ing connections. It is however possible to implement a system where Access Server opens the
Bluetooth connections to the defined static Bluetooth devices or, alternatively, on ad-hoc basis.
In this case, special software must be developed for Access Server, which handles the outgoing
connections and decides where they are opened to. This software can be developed with the
Access Server Software Development Kit (SDK). The software can be written with C, C++ or
standard Linux scripts.
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