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direwolf/kissutil.c

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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2017 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
/*------------------------------------------------------------------
*
* Module: kissutil.c
*
* Purpose: Utility for talking to a KISS TNC.
*
* Description: Convert between KISS format and usual text representation.
* This might also serve as the starting point for an application
* that uses a KISS TNC.
* The TNC can be attached by TCP or a serial port.
*
* Usage: kissutil [ options ]
*
* Default is to connect to localhost:8001.
* See the "usage" functions at the bottom for details.
*
* FIXME: This is a rough prototype that needs more work.
*
*---------------------------------------------------------------*/
#include "direwolf.h" // Sets _WIN32_WINNT for XP API level needed by ws2tcpip.h
#if __WIN32__
#include <winsock2.h>
#include <ws2tcpip.h> // _WIN32_WINNT must be set to 0x0501 before including this
#else
#include <stdlib.h>
#include <sys/errno.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <assert.h>
#include <ctype.h>
#include <string.h>
#include <getopt.h>
#include <sys/types.h>
#include <dirent.h>
//#include "ax25_pad.h"
#include "textcolor.h"
#include "serial_port.h"
#include "kiss_frame.h"
#include "sock.h"
#include "dtime_now.h"
#include "audio.h" // for DEFAULT_TXDELAY, etc.
// TODO: define in one place, use everywhere.
#if __WIN32__
#define THREAD_F unsigned __stdcall
#else
#define THREAD_F void *
#endif
#if __WIN32__
#define DIR_CHAR "\\"
#else
#define DIR_CHAR "/"
#endif
static THREAD_F tnc_listen_net (void *arg);
static THREAD_F tnc_listen_serial (void *arg);
static void send_to_kiss_tnc (int chan, int cmd, char *data, int dlen);
static void hex_dump (unsigned char *p, int len);
// Why didn't I use send/recv for Linux?
#if __WIN32__
#define SOCK_SEND(s,data,size) send(s,data,size,0)
#define SOCK_RECV(s,data,size) recv(s,data,size,0)
#else
#define SOCK_SEND(s,data,size) write(s,data,size)
#define SOCK_RECV(s,data,size) read(s,data,size)
#endif
static void usage(void);
static void usage2(void);
/* Obtained from the command line. */
static char hostname[50] = "localhost"; /* -h option. */
/* DNS host name or IPv4 address. */
/* Some of the code is there for IPv6 but */
/* it needs more work. */
/* Defaults to "localhost" if not specified. */
static char port[30] = "8001"; /* -p option. */
/* If it begins with a digit, it is considered */
/* a TCP port number at the hostname. */
/* Otherwise, we treat it as a serial port name. */
static int using_tcp = 1; /* Are we using TCP or serial port for TNC? */
/* Use corresponding one of the next two. */
/* This is derived from the first character of port. */
static int server_sock = -1; /* File descriptor for socket interface. */
/* Set to -1 if not used. */
/* (Don't use SOCKET type because it is unsigned.) */
static MYFDTYPE serial_fd = (MYFDTYPE)(-1); /* Serial port handle. */
static int serial_speed = 9600; /* -s option. */
/* Serial port speed, bps. */
static int verbose = 0; /* -v option. */
/* Display the KISS protocol in hexadecimal for troubleshooting. */
static char transmit_from[120] = ""; /* -f option */
/* When specified, files are read from this directory */
/* rather than using stdin. Each file is one or more */
/* lines in the standard monitoring format. */
static char receive_output[120] = ""; /* -o option */
/* When specified, each received frame is stored as a file */
/* with a unique name here. */
/* Directory must already exist; we won't create it. */
static char timestamp_format[60] = ""; /* -T option */
/* Precede received frames with timestamp. */
/* Command line option uses "strftime" format string. */
#if __WIN32__
#define THREAD_F unsigned __stdcall
#else
#define THREAD_F void *
#endif
#if __WIN32__
static HANDLE tnc_th;
#else
static pthread_t tnc_tid;
#endif
static void process_input (char *stuff);
/* Trim any CR, LF from the end of line. */
static void trim (char *stuff)
{
char *p;
p = stuff + strlen(stuff) - 1;
while (strlen(stuff) > 0 && (*p == '\r' || *p == '\n')) {
*p = '\0';
p--;
}
} /* end trim */
/*------------------------------------------------------------------
*
* Name: main
*
* Purpose: Attach to KISS TNC and exchange information.
*
* Usage: See "usage" functions at end.
*
*---------------------------------------------------------------*/
int main (int argc, char *argv[])
{
text_color_init (0); // Turn off text color.
// It could interfere with trying to pipe stdout to some other application.
#if __WIN32__
#else
int e;
setlinebuf (stdout); // TODO: What is the Windows equivalent?
#endif
/*
* Extract command line args.
*/
while (1) {
int option_index = 0;
int c;
static struct option long_options[] = {
//{"future1", 1, 0, 0},
//{"future2", 0, 0, 0},
//{"future3", 1, 0, 'c'},
{0, 0, 0, 0}
};
/* ':' following option character means arg is required. */
c = getopt_long(argc, argv, "h:p:s:vf:o:T:",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'h': /* -h for hostname. */
strlcpy (hostname, optarg, sizeof(hostname));
break;
case 'p': /* -p for port, either TCP or serial device. */
strlcpy (port, optarg, sizeof(port));
break;
case 's': /* -s for serial port speed. */
serial_speed = atoi(optarg);
break;
case 'v': /* -v for verbose. */
verbose++;
break;
case 'f': /* -f for transmit files directory. */
strlcpy (transmit_from, optarg, sizeof(transmit_from));
break;
case 'o': /* -o for receive output directory. */
strlcpy (receive_output, optarg, sizeof(receive_output));
break;
case 'T': /* -T for receive timestamp. */
strlcpy (timestamp_format, optarg, sizeof(timestamp_format));
break;
case '?':
/* Unknown option message was already printed. */
usage ();
break;
default:
/* Should not be here. */
text_color_set(DW_COLOR_DEBUG);
dw_printf("?? getopt returned character code 0%o ??\n", c);
usage ();
}
} /* end while(1) for options */
if (optind < argc) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Warning: Unused command line arguments are ignored.\n");
}
/*
* If receive queue directory was specified, make sure that it exists.
*/
if (strlen(receive_output) > 0) {
// TODO
}
/* If port begins with digit, consider it to be TCP. */
/* Otherwise, treat as serial port name. */
using_tcp = isdigit(port[0]);
#if __WIN32__
if (using_tcp) {
tnc_th = (HANDLE)_beginthreadex (NULL, 0, tnc_listen_net, (void *)99, 0, NULL);
}
else {
tnc_th = (HANDLE)_beginthreadex (NULL, 0, tnc_listen_serial, (void *)99, 0, NULL);
}
if (tnc_th == NULL) {
printf ("Internal error: Could not create TNC listen thread.\n");
exit (EXIT_FAILURE);
}
#else
if (using_tcp) {
e = pthread_create (&tnc_tid, NULL, tnc_listen_net, (void *)(long)99);
}
else {
e = pthread_create (&tnc_tid, NULL, tnc_listen_serial, (void *)(long)99);
}
if (e != 0) {
perror("Internal error: Could not create TNC listen thread.");
exit (EXIT_FAILURE);
}
#endif
/*
* Process keyboard or other input source.
*/
char stuff[1000];
if (strlen(transmit_from) > 0) {
/*
* Process and delete all files in specified directory.
* When done, sleep for a second and try again.
* This doesn't take them in any particular order.
* A future enhancement might sort by name or timestamp.
*/
while (1) {
DIR *dp;
struct dirent *ep;
//text_color_set(DW_COLOR_DEBUG);
//dw_printf("Get directory listing...\n");
dp = opendir (transmit_from);
if (dp != NULL) {
while ((ep = readdir(dp)) != NULL) {
char path [300];
FILE *fp;
if (ep->d_name[0] == '.')
continue;
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Processing %s for transmit...\n", ep->d_name);
strlcpy (path, transmit_from, sizeof(path));
strlcat (path, DIR_CHAR, sizeof(path));
strlcat (path, ep->d_name, sizeof(path));
fp = fopen (path, "r");
if (fp != NULL) {
while (fgets(stuff, sizeof(stuff), fp) != NULL) {
trim (stuff);
text_color_set(DW_COLOR_DEBUG);
dw_printf ("%s\n", stuff);
// TODO: Don't delete file if errors encountered?
process_input (stuff);
}
fclose (fp);
unlink (path);
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf("Can't open for read: %s\n", path);
}
}
closedir (dp);
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf("Can't access transmit queue directory %s. Quitting.\n", transmit_from);
exit (EXIT_FAILURE);
}
SLEEP_SEC (1);
}
}
else {
/*
* Using stdin.
*/
while (fgets(stuff, sizeof(stuff), stdin) != NULL) {
process_input (stuff);
}
}
return (EXIT_SUCCESS);
} /* end main */
/*-------------------------------------------------------------------
*
* Name: process_input
*
* Purpose: Process frames/commands from user, either interactively or from files.
*
* Inputs: stuff - A frame is in usual format like SOURCE>DEST,DIGI:whatever.
* Commands begin with lower case letter.
* Note that it can be modified by this function.
*
* Later Enhancement: Return success/fail status. The transmit queue processing might want
* to preserve files that were not processed as expected.
*
*--------------------------------------------------------------------*/
static int parse_number (char *str, int de_fault)
{
int n;
while (isspace(*str)) {
str++;
}
if (strlen(str) == 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Missing number for KISS command. Using default %d.\n", de_fault);
return (de_fault);
}
n = atoi(str);
if (n < 0 || n > 255) { // must fit in a byte.
text_color_set(DW_COLOR_ERROR);
dw_printf ("Number for KISS command is out of range 0-255. Using default %d.\n", de_fault);
return (de_fault);
}
return (n);
}
static void process_input (char *stuff)
{
char *p;
int chan = 0;
/*
* Remove any end of line character(s).
*/
trim (stuff);
/*
* Optional prefix, like "[9]" to specify channel. TODO FIXME
*/
p = stuff;
/*
* If it starts with upper case letter or digit, assume it is an AX.25 frame in monitor format.
* Lower case is a command (e.g. Persistence or set Hardware).
* Anything else, print explanation of what is expected.
*/
if (isupper(*p) || isdigit(*p)) {
// Parse the "TNC2 monitor format" and convert to AX.25 frame.
unsigned char frame_data[AX25_MAX_PACKET_LEN];
packet_t pp = ax25_from_text (p, 1);
if (pp != NULL) {
int frame_len = ax25_pack (pp, frame_data);
send_to_kiss_tnc (chan, KISS_CMD_DATA_FRAME, (char*)frame_data, frame_len);
ax25_delete (pp);
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR! Could not convert to AX.25 frame: %s\n", p);
}
}
else if (islower(*p)) {
char value;
switch (*p) {
case 'd': // txDelay, 10ms units
value = parse_number(p+1, DEFAULT_TXDELAY);
send_to_kiss_tnc (chan, KISS_CMD_TXDELAY, &value, 1);
break;
case 'p': // Persistence
value = parse_number(p+1, DEFAULT_PERSIST);
send_to_kiss_tnc (chan, KISS_CMD_PERSISTENCE, &value, 1);
break;
case 's': // Slot time, 10ms units
value = parse_number(p+1, DEFAULT_SLOTTIME);
send_to_kiss_tnc (chan, KISS_CMD_SLOTTIME, &value, 1);
break;
case 't': // txTail, 10ms units
value = parse_number(p+1, DEFAULT_TXTAIL);
send_to_kiss_tnc (chan, KISS_CMD_TXTAIL, &value, 1);
break;
case 'f': // Full duplex
value = parse_number(p+1, 0);
send_to_kiss_tnc (chan, KISS_CMD_FULLDUPLEX, &value, 1);
break;
case 'h': // set Hardware
p++;
while (*p != '\0' && isspace(*p)) { p++; }
send_to_kiss_tnc (chan, KISS_CMD_SET_HARDWARE, p, strlen(p));
break;
default:
text_color_set(DW_COLOR_ERROR);
dw_printf ("Invalid command. Must be one of d p s t f h.\n");
usage2 ();
break;
}
}
else {
usage2 ();
}
} /* end process_input */
/*-------------------------------------------------------------------
*
* Name: send_to_kiss_tnc
*
* Purpose: Encapsulate the data/command, into a KISS frame, and send to the TNC.
*
* Inputs: chan - channel number.
*
* cmd - KISS_CMD_DATA_FRAME, KISS_CMD_SET_HARDWARE, etc.
*
* data - Information for KISS frame.
*
* dlen - Number of bytes in data.
*
* Description: Encapsulate as KISS frame and send to TNC.
*
*--------------------------------------------------------------------*/
static void send_to_kiss_tnc (int chan, int cmd, char *data, int dlen)
{
unsigned char temp[1000];
unsigned char kissed[2000];
int klen;
if (chan < 0 || chan > 15) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR - Invalid channel %d - must be in range 0 to 15.\n", chan);
chan = 0;
}
if (cmd < 0 || cmd > 15) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR - Invalid command %d - must be in range 0 to 15.\n", cmd);
cmd = 0;
}
if (dlen < 0 || dlen > (int)(sizeof(temp)-1)) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR - Invalid data length %d - must be in range 0 to %d.\n", dlen, (int)(sizeof(temp)-1));
dlen = sizeof(temp)-1;
}
temp[0] = (chan << 4) | cmd;
memcpy (temp+1, data, dlen);
klen = kiss_encapsulate(temp, dlen+1, kissed);
if (verbose) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Sending to KISS TNC:\n");
hex_dump (kissed, klen);
}
// FIXME: Should check for non -1 server_sock or serial_fd.
// Might need to delay when not using interactive input.
if (using_tcp) {
int rc = SOCK_SEND(server_sock, (char*)kissed, klen);
(void)rc;
}
else {
serial_port_write (serial_fd, (char*)kissed, klen);
}
} /* end send_to_kiss_tnc */
/*-------------------------------------------------------------------
*
* Name: tnc_listen_net
*
* Purpose: Connect to KISS TNC via TCP port.
* Print everything it sends to us.
*
* Inputs: arg - Currently not used.
*
* Global In: host
* port
*
* Global Out: server_sock - Needed to send to the TNC.
*
*--------------------------------------------------------------------*/
//#define MAX_HOSTS 30
static THREAD_F tnc_listen_net (void *arg)
{
int err;
char ipaddr_str[SOCK_IPADDR_LEN]; // Text form of IP address.
char data[4096];
int allow_ipv6 = 0; // Maybe someday.
int debug = 0;
int client = 0; // Not used in this situation.
kiss_frame_t kstate;
memset (&kstate, 0, sizeof(kstate));
err = sock_init ();
if (err < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Network interface failure. Can't go on.\n");
exit (EXIT_FAILURE);
}
/*
* Connect to network KISS TNC.
*/
// For the IGate we would loop around and try to reconnect if the TNC
// goes away. We should probably do the same here.
server_sock = sock_connect (hostname, port, "TCP KISS TNC", allow_ipv6, debug, ipaddr_str);
if (server_sock == -1) {
text_color_set(DW_COLOR_ERROR);
// Should have been a message already. What else is there to say?
exit (EXIT_FAILURE);
}
/*
* Print what we get from TNC.
*/
int len;
while ((len = SOCK_RECV (server_sock, (char*)(data), sizeof(data))) > 0) {
int j;
for (j = 0; j < len; j++) {
// Feed in one byte at a time.
// kiss_process_msg is called when a complete frame has been accumulated.
// When verbose is specified, we get debug output like this:
//
// <<< Data frame from KISS client application, port 0, total length = 46
// 000: c0 00 82 a0 88 ae 62 6a e0 ae 84 64 9e a6 b4 ff ......bj...d....
// ...
// It says "from KISS client application" because it was written
// on the assumption it was being used in only one direction.
// Not worried enough about it to do anything at this time.
kiss_rec_byte (&kstate, data[j], verbose, client, NULL);
}
}
text_color_set(DW_COLOR_ERROR);
dw_printf ("Read error from TCP KISS TNC. Terminating.\n");
exit (EXIT_FAILURE);
} /* end tnc_listen_net */
/*-------------------------------------------------------------------
*
* Name: tnc_listen_serial
*
* Purpose: Connect to KISS TNC via serial port.
* Print everything it sends to us.
*
* Inputs: arg - Currently not used.
*
* Global In: port
* serial_speed
*
* Global Out: serial_fd - Need for sending to the TNC.
*
*--------------------------------------------------------------------*/
static THREAD_F tnc_listen_serial (void *arg)
{
int client = 0;
kiss_frame_t kstate;
memset (&kstate, 0, sizeof(kstate));
serial_fd = serial_port_open (port, serial_speed);
if (serial_fd == MYFDERROR) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Unable to connect to KISS TNC serial port %s.\n", port);
exit (EXIT_FAILURE);
}
/*
* Read and print.
*/
while (1) {
int ch;
ch = serial_port_get1(serial_fd);
if (ch < 0) {
dw_printf("Read error from serial port KISS TNC.\n");
exit (EXIT_FAILURE);
}
// Feed in one byte at a time.
// kiss_process_msg is called when a complete frame has been accumulated.
kiss_rec_byte (&kstate, ch, verbose, client, NULL);
}
} /* end tnc_listen_serial */
/*-------------------------------------------------------------------
*
* Name: kiss_process_msg
*
* Purpose: Process a frame from the KISS TNC.
* This is called when a complete frame has been accumulated.
* In this case, we simply print it.
*
* Inputs: kiss_msg - Kiss frame with FEND and escapes removed.
* The first byte contains channel and command.
*
* kiss_len - Number of bytes including the command.
*
* debug - Debug option is selected.
*
* client - Not used in this case.
*
* sendfun - Not used in this case.
*
*-----------------------------------------------------------------*/
void kiss_process_msg (unsigned char *kiss_msg, int kiss_len, int debug, int client, void (*sendfun)(int,int,unsigned char*,int,int))
{
int chan;
int cmd;
packet_t pp;
alevel_t alevel;
chan = (kiss_msg[0] >> 4) & 0xf;
cmd = kiss_msg[0] & 0xf;
switch (cmd)
{
case KISS_CMD_DATA_FRAME: /* 0 = Data Frame */
memset (&alevel, 0, sizeof(alevel));
pp = ax25_from_frame (kiss_msg+1, kiss_len-1, alevel);
if (pp == NULL) {
text_color_set(DW_COLOR_ERROR);
printf ("ERROR - Invalid KISS data frame from TNC.\n");
}
else {
char prefix[100]; // Channel and optional timestamp.
// Like [0] or [2 12:34:56]
char addrs[AX25_MAX_ADDRS*AX25_MAX_ADDR_LEN]; // Like source>dest,digi,...,digi:
unsigned char *pinfo;
int info_len;
if (strlen(timestamp_format) > 0) {
char ts[100];
timestamp_user_format (ts, sizeof(ts), timestamp_format);
snprintf (prefix, sizeof(prefix), "[%d %s]", chan, ts);
}
else {
snprintf (prefix, sizeof(prefix), "[%d]", chan);
}
ax25_format_addrs (pp, addrs);
info_len = ax25_get_info (pp, &pinfo);
text_color_set(DW_COLOR_REC);
dw_printf ("%s %s", prefix, addrs); // [channel] Addresses followed by :
// Safe print will replace any unprintable characters with
// hexadecimal representation.
ax25_safe_print ((char *)pinfo, info_len, 0);
dw_printf ("\n");
/*
* Add to receive queue directory if specified.
* File name will be based on current local time.
* If you want UTC, just set an environment variable like this:
*
* TZ=UTC kissutil ...
*/
if (strlen(receive_output) > 0) {
char fname [30];
char path [300];
FILE *fp;
timestamp_filename (fname, (int)sizeof(fname));
strlcpy (path, receive_output, sizeof(path));
strlcat (path, DIR_CHAR, sizeof(path));
strlcat (path, fname, sizeof(path));
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Save received frame to %s\n", path);
fp = fopen (path, "w");
if (fp != NULL) {
fprintf (fp, "%s %s%s\n", prefix, addrs, pinfo);
fclose (fp);
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Unable to open for write: %s\n", path);
}
}
ax25_delete (pp);
}
break;
case KISS_CMD_SET_HARDWARE: /* 6 = TNC specific */
kiss_msg[kiss_len] = '\0';
text_color_set(DW_COLOR_REC);
// Display as "h ..." for in/out symmetry.
// Use safe print here?
dw_printf ("[%d] h %s\n", chan, (char*)(kiss_msg+1));
break;
/*
* The rest should only go TO the TNC and not come FROM it.
*/
case KISS_CMD_TXDELAY: /* 1 = TXDELAY */
case KISS_CMD_PERSISTENCE: /* 2 = Persistence */
case KISS_CMD_SLOTTIME: /* 3 = SlotTime */
case KISS_CMD_TXTAIL: /* 4 = TXtail */
case KISS_CMD_FULLDUPLEX: /* 5 = FullDuplex */
case KISS_CMD_END_KISS: /* 15 = End KISS mode, port should be 15. */
default:
text_color_set(DW_COLOR_ERROR);
printf ("Unexpected KISS command %d, channel %d\n", cmd, chan);
break;
}
} /* end kiss_process_msg */
// TODO: We have multiple copies of this. Move to some misc file.
void hex_dump (unsigned char *p, int len)
{
int n, i, offset;
offset = 0;
while (len > 0) {
n = len < 16 ? len : 16;
printf (" %03x: ", offset);
for (i=0; i<n; i++) {
printf (" %02x", p[i]);
}
for (i=n; i<16; i++) {
printf (" ");
}
printf (" ");
for (i=0; i<n; i++) {
printf ("%c", isprint(p[i]) ? p[i] : '.');
}
printf ("\n");
p += 16;
offset += 16;
len -= 16;
}
}
static void usage(void)
{
text_color_set(DW_COLOR_INFO);
dw_printf ("\n");
dw_printf ("kissutil - Utility for testing a KISS TNC.\n");
dw_printf ("\n");
dw_printf ("Convert between KISS format and usual text representation.\n");
dw_printf ("The TNC can be attached by TCP or a serial port.\n");
dw_printf ("\n");
dw_printf ("Usage: kissutil [ options ]\n");
dw_printf ("\n");
dw_printf (" -h hostname of TCP KISS TNC, default localhost.\n");
dw_printf (" -p port, default 8001.\n");
dw_printf (" If it does not start with a digit, it is\n");
dw_printf (" a serial port. e.g. /dev/ttyAMA0 or COM3.\n");
dw_printf (" -s Serial port speed, default 9600.\n");
dw_printf (" -v Verbose. Show the KISS frame contents.\n");
dw_printf (" -f Transmit files directory. Processs and delete files here.\n");
dw_printf (" -o Receive output queue directory. Store received frames here.\n");
dw_printf (" -T Precede received frames with 'strftime' format time stamp.\n");
usage2();
exit (EXIT_SUCCESS);
}
static void usage2 (void)
{
text_color_set(DW_COLOR_INFO);
dw_printf ("\n");
dw_printf ("Input, starting with upper case letter or digit, is assumed\n");
dw_printf ("to be an AX.25 frame in the usual TNC2 monitoring format.\n");
dw_printf ("\n");
dw_printf ("Input, starting with a lower case letter is a commmand.\n");
dw_printf ("Whitespace, as shown in examples, is optional.\n");
dw_printf ("\n");
dw_printf (" letter meaning example\n");
dw_printf (" ------ ------- -------\n");
dw_printf (" d txDelay, 10ms units d 30\n");
dw_printf (" p Persistence p 63\n");
dw_printf (" s Slot time, 10ms units s 10\n");
dw_printf (" t txTail, 10ms units t 5\n");
dw_printf (" f Full duplex f 0\n");
dw_printf (" h set Hardware h T.B.D.\n");
dw_printf ("\n");
dw_printf (" Lines may be preceded by the form \"[9]\" to indicate a\n");
dw_printf (" channel other than the default 0.\n");
dw_printf ("\n");
}
/* end kissutil.c */
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