Base I/O subsystems

Modules
	Bluetooth LE (Low Energy) IO functions
	Bluetooth IO functions
	HID (Human Interface Device) IO functions
	Loopback (Simulation/Test) IO functions
	Made for iPod/iPhone/iPad IO functions
	Network I/O
	PIPE I/O functions
	Start a process and perform I/O using stdin, stdout, and stderr
	Serial Port I/O functions

Detailed Description

Some I/O layers are considered base layers and typically do not have any layers underneath them. These are subsystems that handle communication with an endpoint. While higher layers typically deal with manipulation of the data going into and out of the base end point layer. For example, Net is a base layer which handles sending and receiving data over a network socket. TLS is a layer above that manipulates (encrypts and decrypts) the data as it goes into and comes out of the Net layer.