7 connectblue’s modules – Philips Bluetooth QuickStart Kit User Manual

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Bluetooth QuickStart Kit Version 1.0 - User’s Guide

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incoming connection requests to the LAN Access Profile, the LAP role must be enabled in
that specific device. It is possible to enable several instances of the LAP role in order to
allow several parallel connections through the LAP. A device must take the DT role in order
to connect to other devices supporting the LAP role.

The data transfer takes place over PPP and TCP/IP, which encapsulate the actual user data.
The LAN Access profile only provides a transparent serial channel, much like SPP. Only
PPP is dictated by the profile, but TCP/IP is almost always used on top of PPP.

Also observe that the LAN must not be an actual LAN (like Ethernet). It can also be a
simulated LAN, which is very application specific.

LAP

Server

LAN Access Profile

Client

LAN Access Profile

Connect

Data transfer

(PPP, TCP/IP, user data)

LAN

Figure 9 – LAN Access Profile Roles

3.7 connectBlue’s Modules

The Bluetooth module (cB-OEMSPA-13i) from connectBlue that is used in the Bluetooth
QuickStart Kit can operate in one of several different profile modes:

• SPP server

The module waits for SPP clients to connect and establish transparent serial
channels. This mode is not used in the Bluetooth QuickStart Kit.

• SPP clients

The module tries to connect to SPP servers, in order to establish a transparent serial
channel. This mode is not used in the Bluetooth QuickStart Kit.

• LAN Access Server

This is the normal operating mode when using the Bluetooth QuickStart Kit. The
board behaves as a web server that can be accessed from LAN clients that connect
to the LAN server. The system waits for clients (i.e., web browsers) to connect.
There is no actual LAN that is accessed. Instead the TCP/IP stack and web server
on the board are accessed.

• LAN Access Client

This is an alternative operating mode when using the Bluetooth QuickStart Kit. In
this case, the system initiate connection requests (i.e., it is a client) to other LAN
access servers. These servers can be only web servers without any actual LAN
behind when, or they can be LAN access points. In the latter case, the servers act as
gateways between the Bluetooth world and (typically) a wired Ethernet world.