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. resolv - uIP DNS resolver. See apps/include/netutils/resolv.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). 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/ftpc.h for interface information. ftpd - FTP server. See apps/include/netutils/ftpd.h for interface information. 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_UIPLIB=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 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_UIPLIB=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_BUFSIZE=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).