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== Test Environments ==

{| class="smalldiv"
| style="background-color:#F6F9ED" |
| style="background-color:#F6F9ED" | Hardware Comments
| style="background-color:#F6F9ED" | '''Nut/OS 4.6.4'''
| style="background-color:#F6F9ED" | '''Nut/OS 4.7.4'''
| style="background-color:#F6F9ED" | '''Nut/OS 4.8.0'''
|-
| Ethernut 1.3 H
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut13H-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut13H-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut13H-nutos-4.8.0.zip '''Binaries''']
|-
| Ethernut 2.1 B
|
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut21B-nutos-4.6.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut21B-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut21B-nutos-4.8.0.zip '''Binaries''']
|-
| Ethernut 3.0 E
|
| Compiler Error
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut30E-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-enut30E-nutos-4.8.0.zip '''Binaries''']
|-
| EIR 1.0 C
| Set jumper JP1 to DEBUG mode.
| Compiler Error
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-EIR1C-nutos-4.7.4.zip '''Binaries''']
| OK [http://ethernut.de/arc/WIKI_BINARIES_ZIPPED/discovery-EIR1C-nutos-4.8.0.zip '''Binaries''']
|-
| id="compilertd" colspan="5" |'''Compiler:''' ARM-GCC 4.2.2 ; AVR-GCC 4.3.0
|}

== Source Code ==

The code consists of two routines, the main routine and a discovery handler.

<source lang="c">
#include <dev/board.h>
#include <sys/timer.h>

#include <stdio.h>
#include <io.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <pro/dhcp.h>
#include <pro/discover.h>

static NutDiscoveryCallback default_handler;
static int MyHandler(uint32_t ip, uint16_t port, DISCOVERY_TELE * dist, int len);

int main(void)
{
u_long baud = 115200;

NutRegisterDevice(&DEV_DEBUG, 0, 0);
freopen(DEV_DEBUG_NAME, "w", stdout);
_ioctl(_fileno(stdout), UART_SETSPEED, &baud);
puts("Discovery Service Sample");

if (NutRegisterDevice(&DEV_ETHER, 0, 0)) {
puts("Registering " DEV_ETHER_NAME " failed.");
}
else if (NutDhcpIfConfig(DEV_ETHER_NAME, NULL, 0)) {
uint8_t initial_mac[6] = { 0x00, 0x06, 0x98, 0x00, 0x00, 0x00 };

if (NutDhcpIfConfig(DEV_ETHER_NAME, initial_mac, 0)) {
u_long initial_ip_addr = inet_addr("192.0.0.192");
u_long initial_ip_mask = inet_addr("255.255.255.0");

NutNetIfConfig(DEV_ETHER_NAME, initial_mac, initial_ip_addr, initial_ip_mask);
}
}
if (NutRegisterDiscovery(INADDR_BROADCAST, 0, DISF_INITAL_ANN)) {
printf("Discover Service failed");
} else {
default_handler = NutRegisterDiscoveryCallback(MyHandler);
}
for (;;) {
NutSleep(1000);
}
return 0;
}
</source>

<source lang="c">
static int MyHandler(uint32_t ip, uint16_t port, DISCOVERY_TELE * dist, int len)
{
char * tt;

switch (dist->dist_type) {
case DIST_REQUEST:
tt = "request";
break;
case DIST_ANNOUNCE:
tt = "announce";
break;
case DIST_APPLY:
tt = "apply";
break;
default:
tt = "telegram";
break;
}
printf("Discovery %s from %s\n", tt, inet_ntoa(ip));
return (*default_handler)(ip, port, dist, len);
}
</source>

== Output ==

[[Image:discoverer.png|right|thumb|Discoverer]]

On serial output you will see something like:
Discovery Service Sample
Discovery request from 192.168.192.246

The Nut/OS Discoverer will display your (one or more) ethernut board in a table.
By double clicking on the values, you can edit them and update your board.

== See also ==

* [[Network Configuration]] Overview
** [[Network Configuration Using Hard Coded Configuration]], the most basic way to get you up and running.
** [[Network Configuration Using Stored Configuration]]
** [[Network Configuration Using a Configuration Editor]], which may serve as a template for your advanced applications.
* More [[Nut/OS Examples]]

[[Category:Code Snippets]]

{{Languages}}

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