Radio Frequency Communication (RFCOMM) is a simple set of transport protocols that allow the emulating of RS232 serial ports over the L2CAP layer. It's possible to emulate multiple serial ports—up to 60 concurrent open connections are supported. The nine circuits of an RS232 interface are emulated through RFCOMM.
The SPP profile requires a device capable of supporting RFCOMM. This serves as a base for many other profiles such as DNP where a cell phone can be accessed like an old-school serial modem and dial into the Internet by sending the appropriate AT-commands and negotiating a PPP session with a remote Internet access server.
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