netutils README.txt
^^^^^^^^^^^^^^^^^^^
Contents
--------
- uIP Applications
- Other Network Applications
- Tips for Using Telnetd
- Tips for Using DHCPC
uIP Applications
^^^^^^^^^^^^^^^^
This directory contains most of the network applications contained
under the uIP-1.0 apps directory. As the uIP apps/README says,
these applications "are not all heavily tested." These uIP-based
apps include:
dhcpc - Dynamic Host Configuration Protocol (DHCP) client. See
apps/include/netutils/dhcpc.h for interface information.
smtp - Simple Mail Transfer Protocol (SMTP) client. See
apps/include/netutils/smtp.h for interface information.
webclient - HTTP web client. See apps/include/netutils/webclient.h
for interface information.
webserver - HTTP web server. See apps/include/netutils/httpd.h
for interface information.
You may find additional information on these apps in the uIP forum
accessible through: http://www.sics.se/~adam/uip/index.php/Main_Page .
Some of these (such as the uIP web server) have grown some additional
functionality due primarily to NuttX user contributions.
Other Network Applications
^^^^^^^^^^^^^^^^^^^^^^^^^^
Additional applications that were not part of uIP (but which are
highly influenced by uIP) include:
dhcpd - Dynamic Host Configuration Protocol (DHCP) server. See
apps/include/netutils/dhcpd.h for interface information.
discover - This daemon is useful for discovering devices in local
networks, especially with DHCP configured devices. It
listens for UDP broadcasts which also can include a
device class so that groups of devices can be discovered.
It is also possible to address all classes with a kind of
broadcast discover. (Contributed by Max Holtzberg).
esp8266 - An ESP8266 networking layer contributed by Pierre-noel
Bouteville
json - cJSON is an ultra-lightweight, portable, single-file,
simple-as-can-be ANSI-C compliant JSON parser, under MIT
license. Embeddable Lightweight XML-RPC Server discussed at
http://www.drdobbs.com/web-development/an-embeddable-lightweight-xml-rpc-server/184405364.
This code was taken from http://sourceforge.net/projects/cjson/
and adapted for NuttX by Darcy Gong.
tftpc - TFTP client. See apps/include/netutils/tftp.h
for interface information.
telnetd - TELNET server. This is the Telnet logic adapted from
uIP and generalized for use as the front end to any
shell. The telnet daemon creates sessions that are
"wrapped" as character devices and mapped to stdin,
stdout, and stderr. Now the telnet session can be
inherited by spawned tasks.
ftpc - FTP client. See apps/include/netutils/ftpc.h for interface
information.
ftpd - FTP server. See apps/include/netutils/ftpd.h for interface
information.
ntpclient - This is a fragmentary NTP client. It neither well-tested
nor mature nor complete at this point in time.
thttpd - This is a port of Jef Poskanzer's THTTPD HTPPD server.
See http://acme.com/software/thttpd/ for general THTTPD
information. See apps/include/netutils/thttpd.h
for interface information. Applications using this thttpd
will need to provide the following definitions in the
defconfig file to select the appropriate netutils
libraries:
CONFIG_NETUTILS_NETLIB=y
CONFIG_NETUTILS_THTTPD=y
xmlrpc - The Embeddable Lightweight XML-RPC Server discussed at
http://www.drdobbs.com/web-development/an-embeddable-lightweight-xml-rpc-server/184405364
ping - This is an unfinished implementation of ping and ping6 using
raw sockets. It is not yet hooked into the configuration or
build systems.
Current ping/ping6 logic in NSH makes illegal calls into the
OS in order to implement ping/ping6. One correct
implementation would be to use raw sockets to implement ping/
ping6 as a user application. This is a first cut at such an
implementation.
Tips for Using Telnetd
^^^^^^^^^^^^^^^^^^^^^^
Telnetd is set up to be the front end for a shell. The primary use of
Telnetd in NuttX is to support the NuttShell (NSH) Telnet front end. See
apps/include/netutils/telnetd.h for information about how to incorporate
Telnetd into your custom applications.
To enable and link the Telnetd daemon, you need to include the following in
in your defconfig file:
CONFIG_NETUTILS_NETLIB=y
CONFIG_NETUTILS_TELNETD=y
Also if the Telnet console is enabled, make sure that you have the following
set in the NuttX configuration file or else the performance will be very bad
(because there will be only one character per TCP transfer):
CONFIG_STDIO_BUFFER_SIZE Some value >= 64
CONFIG_STDIO_LINEBUFFER=y Since Telnetd is line oriented, line buffering
is optimal.
Tips for Using DHCPC
^^^^^^^^^^^^^^^^^^^^
If you use DHCPC/D, then some special configuration network options are
required. These include:
CONFIG_NET=y Of course
CONFIG_NSOCKET_DESCRIPTORS And, of course, you must allocate some
socket descriptors.
CONFIG_NET_UDP=y UDP support is required for DHCP
(as well as various other UDP-related
configuration settings).
CONFIG_NET_BROADCAST=y UDP broadcast support is needed.
CONFIG_NET_ETH_MTU=650 The client must be prepared to receive
(or larger) DHCP messages of up to 576 bytes (excluding
Ethernet, IP, or UDP headers and FCS).
NOTE: Note that the actual MTU setting will
depend upon the specific link protocol.
Here Ethernet is indicated.
