In
addition, the set of services available changes in an environment
when devices are in motion. Hence SDP is quite different from
service discovery in traditional network-based environments. SDP
is built on top of L2CAP.
??? Serial ports are one of the most common communications
interfaces used in computing and communication devices.
10 Chapter One: Introduction
The RFCOMM protocol provides emulation of serial ports over
L2CAP. RFCOMM provides transport capabilities for upper-level
services that use a serial interface as a transport mechanism.
RFCOMM provides multiple concurrent connections to one device
and provides connections to multiple devices.
??? Bluetooth-enabled devices will have the ability to form networks
and exchange information. For these devices to interoperate and
exchange information, a common packet format must be defined
to encapsulate layer 3 network protocols. The Bluetooth Network
Encapsulation Protocol (BNEP) [5] is an optional protocol that
encapsulates packets from various networking protocols. The packets
are transported directly over L2CAP.
??? Telephony Control Protocol Specification, Binary (TCS binary)
defines the call control signaling for establishment of voice and
data calls between Bluetooth devices. It is built on L2CAP.
??? Adopted protocols, such as OBEX and the Internet Protocol (IP), are
built on one of the protocols discussed earlier (e.
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