Subject:
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Re: lnp addressing messages
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 27 Aug 2002 11:56:03 GMT
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Viewed:
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5148 times
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nanobapt wrote:
> and how to configure address of computer ?
Martin Cornelius wrote a nice little piece on this and related isues. it can be
found at:
http://news.lugnet.com/robotics/rcx/legos/?n=788
in particular look for the sentence:
> . Can the host set its source address? If so, how?
and all shall be revealed :)
taken from luis villas legOS howto i initialize lnp on the PC with:
if(lnp_init(0,0,0,0,0)){
perror("lnp_init\n");
exit(1);
}else{
fprintf(stderr,"init Ok\n");
}
thus if you want to change the address of the PC you will have to change the
third parameter to the lnp_init function call.
f.eks:
if(lnp_init(0,0,1,0,0)){
perror("lnp_init\n");
exit(1);
}else{
fprintf(stderr,"init Ok\n");
}
would set the address of the PC to 0x10.
from left to right the parameters to lnp_init are:
-----------------------------------------
// parameters:
// tcp_hostname:
// host running lnpd to connect - ascii or dotted quad
// 0 means: default to localhost
// tcp_port:
// portnumber to connect to
// 0 means: default to 7776
// lnp_address:
// LNP hostaddress to use
// 0 means: default to 0x80
// lnp_mask:
// LNP hostmask to use
// 0 means: default to 0xF0
// flags:
// bitwise or of:
// LNP_DISCARD_WHILE_TX :
// discard all packets received while waiting for tx result
//
// returns:
// INIT_OK ok, connected to lnp-daemon
// INIT_BAD_PARAM bad parameters
// INIT_ERROR network error, errno is set
-----------------------------------
oki, guess that was it :)
kenneth
>
> nanobapt
> ----- Original Message -----
> From: kenneth johansen <kennethj@stud.cs.uit.no>
> To: nanobapt <nanobapt@nordnet.fr>; <lugnet.robotics.rcx.legos@lugnet.com>
> Sent: Monday, August 26, 2002 3:27 AM
> Subject: Re: lnp addressing messages
>
> > > I have some problem to understand the lnp addressing message. How to set
> > > addresse of computer. How to send a message etc ...
> >
> > hmmmm..okay.......ill give it a shot.
> > the line below:
> > result = lnp_addressing_write(data,len ,DEST_ADDR,MY_PORT_1);
> >
> > will send a message pointed to by data, consisting of len bytes of data to
> > the DEST_ADDR destination using my MY_PORT_1
> > port. in your case below you are sending a message to port 2 on host 0. • host
> > 0 is the default address for the PC.
> > DEST_ADDR is 1 byte consisting of DEST_HOST and DEST_PORT, each 4 bits. • dont
> > know if you are aware of this, but you must
> > also start a lnp daemon on the PC before any messages can be received. • Once
> > the daemon is up and running and you have created a program
> > on the PC that has a handler that listens on port 2 it should be able to
> > receive messages.
> >
> > hope this helps, if you need a better walkthrough let me know and ill c • what
> > i can do. mind you, i only know how to do this in linux :)
> >
> >
> > kenneth
> > kennethj@stud.cs.uit.no
> >
> > > I have an example (lnpd example but i don't understand this :
> > >
> > > #define DEST_ADDR ( DEST_HOST << 4 | DEST_PORT )
> > > result = lnp_addressing_write(data,len ,DEST_ADDR,MY_PORT_1);
> > >
> > > here is the complete program :
> > >
> > > //
> > > // kleines Testprogram für linux lnp
> > > //
> > >
> > > #include <stdio.h>
> > > #include <stdlib.h>
> > > #include <unistd.h>
> > > #include <sys/time.h>
> > > #include <sys/types.h>
> > >
> > > #include "liblnp.h"
> > >
> > > #define MY_PORT_1 7
> > > #define MY_PORT_2 8
> > >
> > > #define DEST_HOST 0
> > > #define DEST_PORT 2
> > > #define DEST_ADDR ( DEST_HOST << 4 | DEST_PORT )
> > > #define LEN 253
> > >
> > > void addr_handler_1(const unsigned char* data,unsigned char length, • unsigned
> > > char src)
> > > {
> > > char pbuf[100];
> > >
> > > sprintf(pbuf,">> Source:%2X Length:%u PacketNo:%u
> > > <<\n",(unsigned)src,(unsigned)length,(unsigned)data[0]);
> > >
> > > write(STDERR_FILENO,pbuf,strlen(pbuf));
> > > }
> > >
> > > void addr_handler_2(const unsigned char* data,unsigned char length, • unsigned
> > > char src)
> > > {
> > > char pbuf[100];
> > >
> > > sprintf(pbuf,">> Source:%2X Length:%u PacketNo:%u
> > > <<\n",(unsigned)src,(unsigned)length,(unsigned)data[0]);
> > >
> > > write(STDERR_FILENO,pbuf,strlen(pbuf));
> > > }
> > >
> > > void int_handler(const unsigned char* data,unsigned char length)
> > > {
> > > char pbuf[100];
> > >
> > > sprintf(pbuf,">> Integrity Length:%u PacketNo:%u
> > > <<\n",(unsigned)length,(unsigned)data[0]);
> > >
> > > write(STDERR_FILENO,pbuf,strlen(pbuf));
> > > }
> > >
> > > int main(int argc, char *argv[])
> > > {
> > > char data[253];
> > > int i;
> > > lnp_tx_result result;
> > > unsigned char len;
> > > int count = 0;
> > >
> > > for (i=0;i<sizeof(data);i++) data[i] = i;
> > >
> > > if ( lnp_init(0,0,0,0,0) )
> > > {
> > > perror("lnp_init");
> > > exit(1);
> > > }
> > >
> > > else fprintf(stderr,"init OK\n");
> > >
> > > lnp_addressing_set_handler (MY_PORT_1, addr_handler_1);
> > > lnp_addressing_set_handler (MY_PORT_2, addr_handler_2);
> > > lnp_integrity_set_handler (int_handler);
> > >
> > > while (1)
> > > {
> > > file://sleep(1000);
> > > file://continue;
> > > len = LEN; file://random() % 252 + 1;
> > > result = lnp_addressing_write(data,len ,DEST_ADDR,MY_PORT_1);
> > > switch (result)
> > > {
> > > case TX_SUCCESS:
> > > printf("Tansmitted %d : %d\n",len,count++);
> > > break;
> > > case TX_FAILURE:
> > > printf("Collision\n");
> > > break;
> > > default:
> > > perror("Transmit error");
> > > exit(1);
> > > }
> > > }
> > >
> > > return 0;
> > > }
> > >
> > >
> > > thanks
> > >
> > >
> > > nanobapt
> >
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Message is in Reply To:
 | | Re: lnp addressing messages
|
| (...) hmmmm..okay.......ill give it a shot. the line below: result = lnp_addressing_write(data,len ,DEST_ADDR,MY_PORT_1); will send a message pointed to by data, consisting of len bytes of data to the DEST_ADDR destination using my MY_PORT_1 port. (...) (24 years ago, 26-Aug-02, to lugnet.robotics.rcx.legos)
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