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doc: net: ppp: Add PPP documentation

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Add information about PPP into Zephyr documentation.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
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Jukka Rissanen 2019-06-26 11:15:39 +03:00
commit c9515b4f50
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doc/reference/networking/net_tech.rst
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@ -9,3 +9,4 @@ Networking Technologies
ethernet.rst
ieee802154.rst
thread.rst
ppp.rst

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doc/reference/networking/ppp.rst Normal file
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.. _ppp:
Point-to-Point Protocol (PPP) Support
#####################################
.. contents::
:local:
:depth: 2
Overview
********
`Point-to-Point Protocol
<https://en.wikipedia.org/wiki/Point-to-Point_Protocol>`_ (PPP) is a data link
layer (layer 2) communications protocol used to establish a direct connection
between two nodes. PPP is used over many types of serial links since IP packets
cannot be transmitted over a modem line on their own, without some data link
protocol.
In Zephyr, each individual PPP link is modelled as a network interface. This
is similar to how Linux implements PPP.
PPP support must be enabled at compile time by setting option
:option:`CONFIG_NET_PPP` and :option:`CONFIG_NET_L2_PPP`.
See also the :zephyr_file:`samples/net/sockets/echo_server/overlay-ppp.conf`
file for configuration option examples.