ODIN-W2 series - Getting Started
UBX-15017452 - R02 Advance Information Bluetooth configuration
Page 14 of 27
Figure 9 Multipoint in extended data mode
For the multipoint case, it is important to consider the master/slave role (which is not the same as client/server). If
a device has multiple Bluetooth connections active and if the device is master for all the connections, this is a
piconet. If the device is master for all of the connections expect one where it is the slave this is called a
scatternet. Performance for a piconet is better and more robust than scatternet. Only 6 parallel channels can be
achieved for a scatternet.
By default, the client becomes the master and the server becomes the slave. If a server wants to support multiple
channels and it wants to have a piconet for best performance, the server must request a master/slave switch for
every incoming connection. The AT+UBTMSP command can set the always master configuration, which requests
a master/slave switch for every incoming (not outgoing) connection.
5.5 Bluetooth security
With the introduction of simple pairing in Bluetooth 2.1, security became quite complex. Especially considering it
must still work between a Bluetooth 2.0 and a Bluetooth 2.1 device.
It is recommended to start with security mode 1 (AT+UBTSM=1), which is Bluetooth 2.0 security disabled and
Bluetooth 2.1 auto accept security for getting started. However, when finalizing the product, security must be
analyzed and a more secure solution may be appropriate.
5.6 Power Save
The power save mode is not implemented currently.
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