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Bluetooth QuickStart Kit Version 1.0 - User’s Guide Page 14
Copyright 2004-2005 © Embedded Artists AB
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
DT
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.