raspi

.gitignore

@@ -1 +1,3 @@
 .DS_Store
+irmc
+*.o

AUTHORS

@@ -0,0 +1,8 @@
+Fernan Bolando (VE4FEB)
+Gerolf Ziegenhain (DG6FL)
+
+MorseKOB:
+Lex Kerr
+
+CWCom Protocol:
+John Samien (VK1EME)

README.md

@@ -1,41 +1,44 @@
-=== WIP - Snipplets ===
+irmc - Internet Relay Morse Code
-How to use:
+================================
+IRMC stands for Internet Relay Morse Code and is an implementation of [MOIP](http://8ch9azbsfifz.github.io/moip/).
 
- 1 usage: irmc [hostname] [port] [channel] [id] [serialport]
+# Building 
-./irmc mtc-kob.dyndns.org 7890 103 123 /dev/tty.usbserial 
+## On Linux
-faeroes.sdf.org.7890
+sudo apt-get install -y alsa-oss oss-compat build-essential autoconf libao-dev libtool libportaudio-dev portaudio19-dev
+make 
+
+### On Raspi (GPIO Interface)
+Follow: http://wiringpi.com/download-and-install/
+make raspi
 
 
-TBD: Driver: 
+## On OSX
-serial - 2usb!
+brew install portaudio
+make
 
-TBD: OSX - howto install dependencies
+# Hardware interface options
+A good description on how to build different interfaces (telegraph key, sounder or both) 
+is given on the [MorseKOB Website](http://kob.sdf.org/morsekob/interface.htm). 
+Landline telegraphs use "closed circuits" for communications; if you have built one at home, 
+you may also use the [loop interface](http://kob.sdf.org/morsekob/docs/loopinterface.pdf).
 
-=== Original post ===
+Connection of a morse key:
-I have been using cwcom to practice sending morsecode, unfortunately my main computer at home is running openbsd and it has gotten harder to gain access to a reliable MS Windows machine. So I wrote my own client that works on openbsd. 
+[layout of pins](http://techpubs.sgi.com/library/dynaweb_docs/0650/SGI_Admin/books/MUX_IG/sgi_html/figures/4-2.serial.port.con.gif)
-This is written in C and although not tested it should compile under other OS. If any one wants to try it and send me feedback. you can download version 0.01 here http://fernan.bitbucket.org/irmc.tgz
-Les Kerr of https://home.comcast.net/~morsekob/ has been very patient in answering my questions regarding the cwcom protocol and setting up a test server during debugging.
 
-There are few difference between this and the official cwcom client
+|  RS232    | DB9    | Function |   
-1. It is a command line tool 
+| :-------- |:-------| :------  | 
-2. It does not send the characters of the message to the receivers screen.
+|  DTR      | 4      | Manual Key / paddle common|
-3. It does not translate CW for you. You can try fldigi if you just want see the transmission.
+|  DSR      | 6      | Manual key / dot paddle|
-4. Tone pitch is currently hard coded to 650Hz
+|  CTS      | 8      | Dash paddle|
-5. It does not have a way to show you who is listening.  
+|  RTS      | 7      | Sounder output|
-
+|  SG       | 5      | Sounder ground|
-Bugs
-There are a few that I am working on right now, but feel free to send me feedback if you get a chance to try it out.
-
-File(s)
-http://fernan.bitbucket.org/irmc.tgz
 
 
-Resources
+# Changelog
-The following people have helped me a lot to learn the protocols and setting up test servers.
+* v0.3 [zip](https://github.com/8cH9azbsFifZ/irmc/archive/v0.3.zip) - commandline option cleanup
-Les Kerr -  https://home.comcast.net/~morsekob/
+* v0.2 [zip](https://github.com/8cH9azbsFifZ/irmc/archive/v0.2.zip) - ported to debian wheezy and osx yosemite, DG6FL
-Bob Denny - http://morse-rss-news.sourceforge.net/
+* v0.1 [zip](https://github.com/8cH9azbsFifZ/irmc/archive/v0.1.zip) - original version, VE7FEB
-John Samin - http://www.mrx.com.au/
-
-=== Source: http://fernski.blogspot.de/2013/03/internet-relay-morsecode.html ===
-=== End Original Post ===
 
+Code Quality
+============
+This is experimental code.

irmc.c

@@ -1,450 +0,0 @@
-/* irmc - internet relay morsecode client */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <netdb.h>
-#include <sys/types.h>
-#include <netinet/in.h>
-#include <sys/socket.h>
-#include <math.h>
-#include <fcntl.h>
-#include <soundcard.h>
-#include <signal.h>
-#include <arpa/inet.h>
-#include "sound.h"
-
-#define MAXDATASIZE 1024 // max number of bytes we can get at once 
-
-#define DIS 0x0002
-#define DAT 0x0003
-#define CON 0x0004
-#define ACK 0x0005
-
-#define DEBUG 0
-
-struct command_packet_format{
-    	unsigned short command;
-    	unsigned short channel;
-};
-struct data_packet_format{
-    	unsigned short command;
-    	unsigned short length;
-    	char id[128];
-    	char a1[4];
-    	unsigned int sequence;
-	unsigned int a21;  
-	unsigned int a22;
-	unsigned int a23;
-    	signed int code[51];
-    	unsigned int n;
-    	char status[128];  /* This is called version in MorseKob */
-    	char a4[8];
-    
-};
-struct code_packet_format{
-    	unsigned short command;
-    	unsigned short length;
-    	char id[128];
-    	char a1[4];
-    	unsigned int sequence;
-	unsigned int a21;
-	unsigned int a22;
-	unsigned int a23;
-    	signed int code[51];
-    	unsigned int n;
-    	char a3[128];
-    	char a4[8];
-};
-
-struct command_packet_format connect_packet;
-struct command_packet_format disconnect_packet = {DIS, 0};
-struct data_packet_format id_packet;
-struct data_packet_format rx_data_packet;
-struct data_packet_format tx_data_packet;
-int serial_status = 0, fd_speaker, fd_serial, fd_socket, numbytes;
-int tx_sequence = 0, rx_sequence;
-
-double tx_timeout = 0;
-long tx_timer = 0;
-#define TX_WAIT  5000
-#define TX_TIMEOUT 240.0 
-#define KEEPALIVE_CYCLE 100
-
-char soundcard[] = "/dev/audio";
-long key_press_t1;
-long key_release_t1;
-int last_message = 0;
-char last_sender[16];
-
-/* settings */
-int translate = 0;
-int audio_status = 1;
-
-/* a better clock() in milliseconds */
-long 
-fastclock(void)
-{
-	struct timespec t;
-	long r;
-
-	clock_gettime(CLOCK_REALTIME, &t);
-	r = t.tv_sec * 1000;
-	r = r + t.tv_nsec / 1000000;
-	return r;
-}
-
-int kbhit (void)
-{
-  	struct timeval tv;
-  	fd_set rdfs;
-
-  	tv.tv_sec = 0;
-  	tv.tv_usec = 0;
-
-  	FD_ZERO(&rdfs);
-  	FD_SET (STDIN_FILENO, &rdfs);
-
-  	select (STDIN_FILENO+1, &rdfs, NULL, NULL, &tv);
-  	return FD_ISSET(STDIN_FILENO, &rdfs);
-
-}
-
-
-/* get sockaddr, IPv4 or IPv6: */
-void *get_in_addr(struct sockaddr *sa)
-{
-	if (sa->sa_family == AF_INET) {
-		return &(((struct sockaddr_in*)sa)->sin_addr);
-	}
-
-	return &(((struct sockaddr_in6*)sa)->sin6_addr);
-}
-
-void
-identifyclient(void)
-{
-	tx_sequence++;
-	id_packet.sequence = tx_sequence;
-	send(fd_socket, &connect_packet, sizeof(connect_packet), 0);
-	send(fd_socket, &id_packet, 496, 0);
-}
-
-void
-inthandler(int sig)
-{
-	signal(sig, SIG_IGN);
-	send(fd_socket, &disconnect_packet, sizeof(disconnect_packet), 0);	
-	close(fd_socket);
-	close(fd_speaker);
-	close(fd_serial);
-	exit(1);
-}
-
-void
-txloop (void)
-{
-	key_press_t1 = fastclock();
-	tx_timeout = 0;
-	for(;;){
-		tx_data_packet.n++;
-		tx_data_packet.code[tx_data_packet.n - 1] = 
-			(int) ((key_press_t1 - key_release_t1) * -1);
-
-		//printf("space: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
-		while(serial_status & TIOCM_DSR) ioctl(fd_serial, TIOCMGET, &serial_status);
-		key_release_t1 = fastclock();
-
-		tx_data_packet.n++;	
-		tx_data_packet.code[tx_data_packet.n - 1] =
-			(int) ((key_release_t1 - key_press_t1) * 1);
-		
-		//printf("mark: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
-		while(1){
-			ioctl(fd_serial, TIOCMGET, &serial_status);
-			if(serial_status & TIOCM_DSR) break;
-			tx_timeout = fastclock() - key_release_t1;
-			if(tx_timeout > TX_TIMEOUT) return;
-		}
-		key_press_t1 = fastclock();	
-		if(tx_data_packet.n == 50) {
-			printf("irmc: warning packet is full.\n");
-			return;
-		}
-	}
-}
-
-int
-commandmode(void)
-{
-	char cmd[32];
-	int i;
-
-	last_message = 0; /* reset status message */
-	printf(".");
-	fgets(cmd, 32, stdin);
-	if(strncmp(cmd, ".", 1) == 0){
-		printf("\n");
-		return 1;
-	}
-	if((strncmp(cmd, "latch", 3)) == 0){
-		tx_sequence++;
-		tx_data_packet.sequence = tx_sequence;
-		tx_data_packet.code[0] = -1;
-		tx_data_packet.code[1] = 1;
-		tx_data_packet.n = 2;
-		for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, 496, 0);
-		tx_data_packet.n = 0;
-		return 0;
-	}
-
-	if((strncmp(cmd, "unlatch", 3)) == 0){
-		tx_sequence++;
-		tx_data_packet.sequence = tx_sequence;
-		tx_data_packet.code[0] = -1;
-		tx_data_packet.code[1] = 2;
-		tx_data_packet.n = 2;
-		for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, 496, 0);
-		tx_data_packet.n = 0;
-		return 0;
-	}
-	if((strncmp(cmd, "ton", 3)) == 0){
-		translate = 1;
-		return 0;
-	}
-	if((strncmp(cmd, "toff", 3)) == 0){
-		translate = 0;
-		return 0;
-	}
-	
-	if((strncmp(cmd, "aon", 3)) == 0){
-		audio_status = 1;
-		fd_speaker = open_audio_device(soundcard, O_WRONLY);
-		return 0;
-	}
-	if((strncmp(cmd, "aoff", 3)) == 0){
-		audio_status = 0;
-		close(fd_speaker);
-		return 0;
-	}
-	printf("?\n");
-	return 0;
-}
-
-
-void
-message(int msg)
-{       
-	switch(msg){
-	case 1:
-		if(last_message == msg) return;
-		if(last_message == 2) printf("\n");
-		last_message = msg;
-		printf("irmc: transmitting...\n");
-		break;
-	case 2:
-		if(last_message == msg && strncmp(last_sender, rx_data_packet.id, 3) == 0) return;
-		else {
-			if(last_message == 2) printf("\n");
-			last_message = msg;
-			strncpy(last_sender, rx_data_packet.id, 3);
-			printf("irmc: receiving...(%s)\n", rx_data_packet.id);
-		}
-		break;
-	case 3:
-		printf("irmc: circuit was latched by %s.\n", rx_data_packet.id);
-		break;
-	case 4:
-		printf("irmc: circuit was unlatched by %s.\n", rx_data_packet.id);
-		break;
-	default:
-		break;
-	}
-	fflush(0);
-}
-	 
-int main(int argc, char *argv[])
-{
-	char buf[MAXDATASIZE];
-	struct addrinfo hints, *servinfo, *p;
-	int rv, i;
-	char s[INET6_ADDRSTRLEN];
-	int keepalive_t = 0;
-	char hostname[64];
-	char port[16];
-	int channel;
-	char id[128];
-	char serialport[64];
-
-
-	if (argc < 4) {
-	    fprintf(stderr," %i usage: irmc [hostname] [port] [channel] [id] [serialport]\n", argc);
-	    exit(1);
-	}
-
-	snprintf(hostname, 64, argv[1], "%s");
-	snprintf(port, 16, argv[2], "%s");
-	channel = atoi(argv[3]);
-	if(argc > 4) snprintf(id, 128, argv[4], "%s");
-	else snprintf(id, 128, "irmc"); 
-	if(argc > 5) snprintf(serialport, 64, argv[5], "%s");
-
-	id_packet.command = DAT;
-	id_packet.length = 492;
-	snprintf(id_packet.id, 128, id, "%s");
-	id_packet.sequence = 0;
-	id_packet.n = 0;
-	snprintf(id_packet.status, 128, "irmc v0.02");
-	id_packet.a21 = 1;     /* These magic numbers was provided by Les Kerr */
-	id_packet.a22 = 755;
-	id_packet.a23 = 65535;
-	
-	tx_data_packet.command = DAT;
-	tx_data_packet.length = 492;
-	snprintf(tx_data_packet.id, 128,  id, "%s");
-	tx_data_packet.sequence = 0;
-	tx_data_packet.n = 0;
-	for(i = 1; i < 51; i++)tx_data_packet.code[i] = 0;
-	tx_data_packet.a21 = 0; /* These magic numbers was provided by Les Kerr */
-	tx_data_packet.a22 = 755;
-	tx_data_packet.a23 = 16777215;
-	snprintf(tx_data_packet.status, 128, "?");
-	
-	connect_packet.command = CON;
-	connect_packet.channel = channel; 
-		
-	
-	signal(SIGINT, inthandler);
-	
-	memset(&hints, 0, sizeof hints);
-	hints.ai_family = AF_UNSPEC; /* ipv4 or ipv6 */
-	hints.ai_socktype = SOCK_DGRAM;
-
-	if ((rv = getaddrinfo(hostname, port, &hints, &servinfo)) != 0) {
-		fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
-		return 1;
-	}
-	
-	/* Find the first free socket */
-	for(p = servinfo; p != NULL; p = p->ai_next) {
-		if ((fd_socket = socket(p->ai_family, p->ai_socktype,
-			p->ai_protocol)) == -1) {
-			perror("irmc: socket");
-			continue;
-		}
-
-		if (connect(fd_socket, p->ai_addr, p->ai_addrlen) == -1) {
-			close(fd_socket);
-			perror("irmc: connect");
-			continue;
-		}
-
-		break;
-	}
-    
-    
-    	fcntl(fd_socket, F_SETFL, O_NONBLOCK);
-	if (p == NULL) {
-		fprintf(stderr, "irmc: failed to connect\n");
-		return 2;
-	}
-
-	inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
-			s, sizeof s);
-	printf("irmc: connected to %s\n", s);
-	fd_speaker = open_audio_device(soundcard, O_WRONLY);
-	fd_serial = open(serialport, O_RDWR | O_NOCTTY | O_NDELAY);
-	if(fd_serial == -1) {
-    		printf("irmc: unable to open serial port.\n");
-    	}
-	freeaddrinfo(servinfo); /* all done with this structure */
-
-	key_release_t1 = fastclock();
-	init_sound();
-	identifyclient();
-    
-	/* Main Loop */
-	for(;;) {
-  		if(tx_timer == 0) 
-			if((numbytes = recv(fd_socket, buf, MAXDATASIZE-1, 0)) == -1)
-				usleep(250);
-		if(numbytes == 496 && tx_timer == 0){
-			memcpy(&rx_data_packet, buf, 496);
-		#if DEBUG  
-			printf("length: %i\n", rx_data_packet.length);
-			printf("id: %s\n", rx_data_packet.id);
-			printf("sequence no.: %i\n", rx_data_packet.sequence);
-			printf("version: %s\n", rx_data_packet.status);
-			printf("n: %i\n", rx_data_packet.n);
-			printf("code:\n");
-			for(i = 0; i < 51; i++)printf("%i ", rx_data_packet.code[i]); printf("\n");
-		#endif
-			if(rx_data_packet.n > 0 && rx_sequence != rx_data_packet.sequence){
-				message(2);
-				if(translate == 1){
-					printf("%s", rx_data_packet.status);
-					fflush(0);
-				}
-				rx_sequence = rx_data_packet.sequence;
-				for(i = 0; i < rx_data_packet.n; i++){
-					switch(rx_data_packet.code[i]){
-					case 1:
-						message(3);
-						break;
-					case 2:
-						message(4);
-						break;
-					default:
-						if(audio_status == 1) 
-							play_code_element (rx_data_packet.code[i]);
-						break;
-					}
-				}
-			}
-		}
-	
-		if(tx_timer > 0) tx_timer--;
-		if(tx_data_packet.n > 1 ){
-			tx_sequence++;
-			tx_data_packet.sequence = tx_sequence;
-			for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, 496, 0);
-		#if DEBUG		
-			printf("irmc: sent data packet.\n");
-		#endif
-			tx_data_packet.n = 0;
-		}
-		ioctl(fd_serial,TIOCMGET, &serial_status);
-		if(serial_status & TIOCM_DSR){
-			txloop();
-			tx_timer = TX_WAIT;
-			message(1);
-		}
-		
-		if(keepalive_t < 0 && tx_timer == 0){
-		#if DEBUG
-			printf("keep alive sent.\n");
-		#endif
-			identifyclient();
-			keepalive_t = KEEPALIVE_CYCLE;
-		}
-		if(tx_timer == 0) {
-			keepalive_t--;
-			usleep(50);	
-		}		
-
-		if(kbhit() && tx_timer == 0){
-			getchar(); /* flush the buffer */
-			if(commandmode()== 1)break;
-		}
-	} /* End of mainloop */
-
-	send(fd_socket, &disconnect_packet, sizeof(disconnect_packet), 0);	
-	close(fd_socket);
-	close(fd_speaker);
-	close(fd_serial);
-
-	exit(0); 
-}
-

sound.c

@@ -1,94 +0,0 @@
-/* irmc - internet relay morsecode client */
-
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <soundcard.h>
-#include <math.h>
-
-#define SAMPLE_RATE 48000
-
-int sample_rate = SAMPLE_RATE;
-int fd_speaker;
-int zinebuf[SAMPLE_RATE * 2]; 
-int pitch = 650;
-
-void
-init_sound()
-{
-	int i, pr;
-
-	pr = sample_rate / pitch;
-
-	for(i = 0; i < SAMPLE_RATE * 2; i++)
-		zinebuf[i] = 32767 * sin(2 * 3.1415 / pr * (double)i );
-}
-
-void
-play_code_element (int length)
-{
-  	int i;
-  	short buf[SAMPLE_RATE * 4];		
-
-  	int outsz;
-	
-	outsz = abs(length) * SAMPLE_RATE / 1000;
-	
-	if(length == 0 || abs(length) > 2000) return;
-	if(length < 0) {   /* Space */
-		for (i = 0; i < outsz; i++) buf[i] = 0;
-	} else { /* Mark */
-		for (i = 0; i < outsz; i++) buf[i] = zinebuf[i];
-	}
-
-	if (write (fd_speaker, buf, outsz * 2) != (outsz * 2)){
-      		perror ("Audio write");
-      		exit (-1);
-    	}
-}
-
-
-int
-open_audio_device (char *name, int mode)
-{
-  	int tmp, fd;
-
-  	if ((fd = open (name, mode, 0)) == -1){
-      		perror (name);
-      		//exit (-1);
-    	}
-
-  	tmp = AFMT_S16_NE;		/* Native 16 bits */
-  	if (ioctl (fd, SNDCTL_DSP_SETFMT, &tmp) == -1){
-      		perror ("SNDCTL_DSP_SETFMT");
-      		exit (-1);
-    	}
-
-  	if (tmp != AFMT_S16_NE){
-      		fprintf (stderr,
-	       		"The device doesn't support the 16 bit sample format.\n");
-      		exit (-1);
-    	}
-
-  	tmp = 1;
-  	if (ioctl (fd, SNDCTL_DSP_CHANNELS, &tmp) == -1){
-      		perror ("SNDCTL_DSP_CHANNELS");
-      		exit (-1);
-    	}
-
-  	if (tmp != 1){
-      		fprintf (stderr, "The device doesn't support mono mode.\n");
-      		exit (-1);
-    	}
-
-  	//sample_rate = 48000;
-  	if (ioctl (fd, SNDCTL_DSP_SPEED, &sample_rate) == -1){
-      		perror ("SNDCTL_DSP_SPEED");
-      		exit (-1);
-    	}
-
-  	return fd;
-}
-
-

sound.h

@@ -1,3 +0,0 @@
-void init_sound (void);
-void play_code_element (int);
-int open_audio_device (char *, int);

src/Makefile

@@ -1,7 +1,7 @@
-SRC = irmc.c sound.c
+SRC = irmc.c cwprotocol.c beep.c util.c
 OBJ = ${SRC:.c=.o}
-LDFLAGS = -lm -lossaudio
+LDFLAGS = -lportaudio -lpthread -lm 
-CFLAGS = -Wall  
+CFLAGS = -Wall -Wno-format-zero-length
 INSTALLDIR = ${HOME}/bin
 
 all: options irmc 
@@ -21,9 +21,12 @@ irmc:   ${OBJ}
 	@echo CC -o $@
 	@${CC} -o $@ ${OBJ} ${LDFLAGS}
 
-hex: 	${OBJ}
+raspi:	
-	@echo avr-gcc -o $@
+	@${CC} -c -DRASPI ${CFLAGS} ${SRC}
-	avr-gcc -o $@ ${OBJ} ${LDFLAGS}
+	@${CC} -o irmc ${OBJ} ${LDFLAGS} -lwiringPi
+
+java:
+	java -jar test/MorseKOB.jar 
 
 clean:
 	@echo cleaning

src/beep.c

@@ -0,0 +1,170 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h> // for usleep()
+#include <portaudio.h>
+
+#include "beep.h"
+
+#ifdef RASPI
+#define RASPI_AUDIO_LATENCY_FIX (30./5.) // https://app.assembla.com/spaces/portaudio/tickets/246-paex_sine-choppy-on-raspberry-pi---defaultlowoutputlatency-too-low/details
+#else
+#define RASPI_AUDIO_LATENCY_FIX (1.)
+#endif
+ 
+// http://stackoverflow.com/questions/7678470/generating-sound-of-a-particular-frequency-using-gcc-in-ubuntu
+
+static PaStream *stream;
+static paTestData data;
+
+
+/* This routine will be called by the PortAudio engine when audio is needed.
+** It may called at interrupt level on some machines so don't do anything
+** that could mess up the system like calling malloc() or free().
+*/
+static int patestCallback( const void *inputBuffer, void *outputBuffer,
+                           unsigned long framesPerBuffer,
+                           const PaStreamCallbackTimeInfo* timeInfo,
+                           PaStreamCallbackFlags statusFlags,
+                           void *userData )
+{
+    paTestData *data = (paTestData*)userData;
+    uint8_t *out = (uint8_t*)outputBuffer;
+    unsigned long i;
+    uint32_t freq = data->freq;
+
+    (void) timeInfo; /* Prevent unused variable warnings. */
+    (void) statusFlags;
+    (void) inputBuffer;
+
+    for( i=0; i<framesPerBuffer; i++ )
+    {
+        if(data->up_count > 0 && data->total_count == data->up_count) {
+            *out++ = 0x00;
+            continue;
+        }
+        data->total_count++;
+
+        if(freq != data->prev_freq) {
+            data->counter = 0;
+        }
+
+        if(freq) {
+            int overflow_max = SAMPLE_RATE / freq;
+            uint32_t data_cnt = data->counter % overflow_max;
+            if(data_cnt > overflow_max/2)
+                *out++ = 0xff;
+            else {
+                *out++ = 0x00;
+            }
+            data->counter++;
+        }
+        else {
+            data->counter = 0;
+            *out++ = 0;
+        }
+        data->prev_freq = freq;
+    }
+
+    return paContinue;
+}
+
+void buzzer_set_freq(int frequency)
+{
+    data.up_count = 0; // do not stop!
+    data.freq = frequency;
+}
+
+void buzzer_beep(int frequency, int msecs)
+{
+    data.total_count = 0;
+    data.up_count = SAMPLE_RATE * msecs / 1000;
+    data.freq = frequency;
+}
+
+int buzzer_start(void)
+{
+    PaStreamParameters outputParameters;
+
+    PaError err;
+
+    err = Pa_Initialize();
+    if( err != paNoError ) goto error;
+
+    outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
+    outputParameters.channelCount = 1;       /* stereo output */
+    outputParameters.sampleFormat = paUInt8; /* 32 bit floating point output */
+    outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency * RASPI_AUDIO_LATENCY_FIX; 
+    outputParameters.hostApiSpecificStreamInfo = NULL;
+
+    err = Pa_OpenStream(
+        &stream,
+        NULL, /* no input */
+        &outputParameters,
+        SAMPLE_RATE,
+        FRAMES_PER_BUFFER,
+        paClipOff,      /* we won't output out of range samples so don't bother clipping them */
+        patestCallback,
+        &data );
+    if( err != paNoError ) goto error;
+
+    err = Pa_StartStream( stream );
+    if( err != paNoError ) goto error;
+
+    return err;
+error:
+    Pa_Terminate();
+    fprintf( stderr, "An error occured while using the portaudio stream\n" );
+    fprintf( stderr, "Error number: %d\n", err );
+    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+    return err;
+
+}
+
+int buzzer_stop() 
+{
+    PaError err = 0;
+    err = Pa_StopStream( stream );
+    if( err != paNoError ) goto error;
+
+    err = Pa_CloseStream( stream );
+    if( err != paNoError ) goto error;
+
+    Pa_Terminate();
+
+    return err;
+error:
+    Pa_Terminate();
+    fprintf( stderr, "An error occured while using the portaudio stream\n" );
+    fprintf( stderr, "Error number: %d\n", err );
+    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+    return err;
+}
+void msleep(int d){
+    usleep(d*1000);
+}
+
+
+int beep(double freq_hz, double duration_sec)
+{
+	buzzer_set_freq(freq_hz);
+	msleep(duration_sec*1000.);
+	buzzer_set_freq(0.);
+	return 0;
+}
+int beep_init()
+{
+	buzzer_start();
+	return 0;
+}
+
+
+int beep_test(void)
+{
+    buzzer_start();
+    buzzer_set_freq(261);
+    msleep(250);
+    buzzer_set_freq(0);
+    buzzer_stop();
+    return 0;
+}

src/beep.h

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <math.h>
+#include "portaudio.h"
+
+#define NUM_SECONDS   (5)
+#define SAMPLE_RATE   (44100)
+#define FRAMES_PER_BUFFER  (64)
+
+#ifndef M_PI
+#define M_PI  (3.14159265)
+#endif
+
+typedef struct
+{
+    uint32_t total_count;
+    uint32_t up_count;
+
+    uint32_t counter;
+    uint32_t prev_freq;
+    uint32_t freq;
+} paTestData;
+
+void buzzer_set_freq(int frequency);
+void buzzer_beep(int frequency, int msecs);
+int buzzer_start(void);
+int buzzer_stop();
+void msleep(int d);
+int beep_test(void);
+
+// compatibility to old interface
+int beep(double freq_hz, double duration_sec);
+int beep_init();

src/cwprotocol.c

@@ -0,0 +1,85 @@
+#include <stdio.h>
+#include <sys/socket.h>
+
+#include "cwprotocol.h"
+
+/* Global variables */
+struct command_packet_format connect_packet = {CON, DEFAULT_CHANNEL}; 
+struct command_packet_format disconnect_packet = {DIS, 0};
+struct data_packet_format id_packet;
+struct data_packet_format rx_data_packet;
+struct data_packet_format tx_data_packet;
+
+int tx_sequence = 0, rx_sequence;
+int fd_socket;
+
+int prepare_id (struct data_packet_format *id_packet, char *id)
+{
+	id_packet->command = DAT;
+	id_packet->length = SIZE_DATA_PACKET_PAYLOAD;
+	snprintf(id_packet->id, SIZE_ID, id, "%s");
+	id_packet->sequence = 0;
+	id_packet->n = 0;
+	snprintf(id_packet->status, SIZE_ID, INTERFACE_VERSION);
+	id_packet->a21 = 1;     /* These magic numbers was provided by Les Kerr */
+	id_packet->a22 = 755;
+	id_packet->a23 = 65535;
+
+	return 0;
+}
+
+
+int prepare_tx (struct data_packet_format *tx_packet, char *id)
+{
+	int i;
+
+	tx_packet->command = DAT;
+	tx_packet->length = SIZE_DATA_PACKET_PAYLOAD;
+	snprintf(tx_packet->id, SIZE_ID,  id, "%s");
+	tx_packet->sequence = 0;
+	tx_packet->n = 0;
+	for(i = 1; i < 51; i++)tx_packet->code[i] = 0;
+	tx_packet->a21 = 0; /* These magic numbers was provided by Les Kerr */
+	tx_packet->a22 = 755;
+	tx_packet->a23 = 16777215;
+	snprintf(tx_packet->status, SIZE_STATUS, "?"); // this shall include the sent character
+	
+	return 0;
+}
+
+
+// connect to server and send my id.
+void identifyclient(void)
+{
+	tx_sequence++;
+	id_packet.sequence = tx_sequence;
+	send(fd_socket, &connect_packet, SIZE_COMMAND_PACKET, 0);
+	send(fd_socket, &id_packet, SIZE_DATA_PACKET, 0);
+}
+
+int send_latch (void)
+{
+	int i;
+	tx_sequence++;
+	tx_data_packet.sequence = tx_sequence;
+	tx_data_packet.code[0] = -1;
+	tx_data_packet.code[1] = 1;
+	tx_data_packet.n = 2;
+	for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, SIZE_DATA_PACKET, 0);
+	tx_data_packet.n = 0;
+	return 0;
+}
+
+int send_unlatch (void)
+{
+	int i;
+	tx_sequence++;
+	tx_data_packet.sequence = tx_sequence;
+	tx_data_packet.code[0] = -1;
+	tx_data_packet.code[1] = 2;
+	tx_data_packet.n = 2;
+	for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, SIZE_DATA_PACKET, 0);
+	tx_data_packet.n = 0;
+	return 0;
+}
+

src/cwprotocol.h

@@ -0,0 +1,62 @@
+#define INTERFACE_VERSION "irmc v0.3.3"
+
+// Structures for the packets: unsigned short command
+#define DIS 0x0002 // disconnect
+#define DAT 0x0003 
+#define CON 0x0004 // connect
+#define ACK 0x0005
+
+#define SIZE_COMMAND_PACKET 4
+#define SIZE_DATA_PACKET 496
+#define SIZE_DATA_PACKET_PAYLOAD 492 // = SIZE_DATA_PACKET - SIZE_COMMAND_PACKET
+
+#define SIZE_ID 128
+#define SIZE_STATUS 128
+#define SIZE_CODE 51
+
+// This structure will be used to (dis-)connect to KOB servers
+struct command_packet_format{
+    	unsigned short command; // CON / DIS
+    	unsigned short channel; // Channel number
+};
+
+// This structure will be used for id, rx and tx packets
+struct data_packet_format{
+    	unsigned short command;
+    	unsigned short length;
+    	char id[SIZE_ID];
+    	char a1[4];
+    	unsigned int sequence;
+	unsigned int a21;  
+	unsigned int a22;
+	unsigned int a23;
+    	signed int code[SIZE_CODE];
+    	unsigned int n;
+    	char status[SIZE_STATUS];  /* This is called version in MorseKob, in cwcom this transmits the sent character?! */
+    	char a4[8];
+    
+};
+
+// Define the packets used
+#define DEFAULT_CHANNEL 103
+
+/* Define functions provided by cwprotocol */ 
+int prepare_id (struct data_packet_format *id_packet, char *id);
+int prepare_tx (struct data_packet_format *tx_packet, char *id);
+void identifyclient (void);
+int send_latch (void);
+int send_unlatch (void);
+
+/* Define external struct for global variables */
+extern struct command_packet_format connect_packet;
+extern struct command_packet_format disconnect_packet;
+extern struct data_packet_format id_packet;
+extern struct data_packet_format rx_data_packet;
+extern struct data_packet_format tx_data_packet;
+
+extern int tx_sequence, rx_sequence;
+
+extern int fd_socket;
+
+
+

src/irmc.c

@@ -0,0 +1,382 @@
+/* irmc - internet relay morsecode client */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <netdb.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <math.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <signal.h>
+#include <arpa/inet.h>
+
+#define MAXDATASIZE 1024 // max number of bytes we can get at once 
+
+#include "cwprotocol.h"
+#include "beep.h"
+#include "util.h"
+
+// http://raspberrypiguide.de/howtos/raspberry-pi-gpio-how-to/
+#ifdef RASPI
+#include <wiringPi.h>
+#define TX_RASPI_PIN 5
+#endif
+
+
+int serial_status = 0, fd_serial, numbytes;
+
+double tx_timeout = 0;
+long tx_timer = 0;
+#define TX_WAIT  5000
+#define TX_TIMEOUT 240.0 
+#define KEEPALIVE_CYCLE 100
+
+/* TX Methods */
+#define TX_NONE 0
+//#define TX_SERIAL 1
+//#define TX_KEYBOARD 2 // not implemented yet
+#define TX_RASPI 3
+
+long key_press_t1;
+long key_release_t1;
+int last_message = 0;
+char last_sender[16];
+
+/* settings */
+int translate = 1;
+int audio_status = 1;
+
+// disconnect from the server
+void inthandler(int sig)
+{
+	signal(sig, SIG_IGN);
+	send(fd_socket, &disconnect_packet, SIZE_COMMAND_PACKET, 0);	
+	close(fd_socket);
+#ifdef TX_SERIAL
+	close(fd_serial);
+#endif
+	exit(1);
+}
+
+void txloop (void)
+{
+	key_press_t1 = fastclock();
+	tx_timeout = 0;
+	for(;;){
+		tx_data_packet.n++;
+		tx_data_packet.code[tx_data_packet.n - 1] = 
+			(int) ((key_press_t1 - key_release_t1) * -1);
+
+#ifdef DEBUG
+		printf("space: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
+#endif
+#ifdef TX_SERIAL
+		while(serial_status & TIOCM_DSR) ioctl(fd_serial, TIOCMGET, &serial_status);
+#endif
+#ifdef RASPI
+		while(digitalRead(TX_RASPI_PIN)==1) { }
+#endif
+		key_release_t1 = fastclock();
+
+		tx_data_packet.n++;	
+		tx_data_packet.code[tx_data_packet.n - 1] =
+			(int) ((key_release_t1 - key_press_t1) * 1);
+
+#ifdef DEBUG		
+		printf("mark: %i\n", tx_data_packet.code[tx_data_packet.n -1]);
+#endif
+		while(1){
+#ifdef TX_SERIAL
+			ioctl(fd_serial, TIOCMGET, &serial_status);
+			if(serial_status & TIOCM_DSR) break;
+#endif
+#ifdef RASPI
+			if(digitalRead(TX_RASPI_PIN)==1) break;
+#endif
+			tx_timeout = fastclock() - key_release_t1;
+			if(tx_timeout > TX_TIMEOUT) return;
+		}
+		key_press_t1 = fastclock();	
+		if(tx_data_packet.n == SIZE_CODE) {
+			printf("irmc: warning packet is full.\n");
+			return;
+		}
+	}
+}
+
+
+void message(int msg)
+{       
+	switch(msg){
+	case 1:
+		if(last_message == msg) return;
+		if(last_message == 2) printf("\n");
+		last_message = msg;
+		printf("irmc: transmitting...\n");
+		break;
+	case 2:
+		if(last_message == msg && strncmp(last_sender, rx_data_packet.id, 3) == 0) return;
+		else {
+			if(last_message == 2) printf("\n");
+			last_message = msg;
+			strncpy(last_sender, rx_data_packet.id, 3);
+			printf("irmc: receiving...(%s)\n", rx_data_packet.id);
+		}
+		break;
+	case 3:
+		printf("irmc: circuit was latched by %s.\n", rx_data_packet.id);
+		break;
+	case 4:
+		printf("irmc: circuit was unlatched by %s.\n", rx_data_packet.id);
+		break;
+	default:
+		break;
+	}
+	fflush(0);
+}
+
+
+/* Main Loop */
+int main(int argc, char *argv[])
+{
+	char buf[MAXDATASIZE];
+	struct addrinfo hints, *servinfo, *p;
+	int rv, i;
+	char s[INET6_ADDRSTRLEN];
+	int keepalive_t = 0;
+	char hostname[64];
+	char port[16];
+	int channel;
+	char id[SIZE_ID];
+	char serialport[64];
+
+	// Set default values
+	snprintf(hostname, 64, "mtc-kob.dyndns.org");
+	snprintf(port, 16, "7890");
+	channel = 103;
+	snprintf(id, SIZE_ID, "irmc-default");
+	snprintf(serialport, 64, "");
+
+	// Read commandline
+	opterr = 0; 
+	int c;
+	while ((c = getopt (argc, argv, "h:p:c:i:s:")) != -1)
+	{
+		switch (c) 
+		{
+			case 'h':
+				snprintf(hostname, 64, "%s", optarg);
+				break;
+			case 'p':
+				snprintf(port, 16, "%s", optarg);
+				break;
+			case 'c':
+				channel = atoi (optarg);
+				break;
+			case 'i':
+				snprintf(id, SIZE_ID, "%s", optarg);
+				break;
+			case 's':
+				snprintf(serialport, 64, "%s", optarg);
+				break;
+			case '?':
+	    			fprintf(stderr, "irmc - Internet Relay Morse Code\n\n");
+				fprintf(stderr, "usage: irmc [arguments]\n\n");
+				fprintf(stderr, "Arguments:\n\n");
+				fprintf(stderr, "   -h [hostname]     Hostname of morsekob server. Default: %s\n", hostname);
+				fprintf(stderr, "   -p [port]         Port of morsekob server. Default: %s\n", port);
+				fprintf(stderr, "   -c [channel]      Channel. Default: %d\n", channel);
+				fprintf(stderr, "   -i [id]           My ID. Default: %s\n", id);
+				fprintf(stderr, "   -s [serialport]   Serial port device name. Example: /dev/tty.usbserial Default: \"%s\"\n", serialport);
+				return 1;
+			default: 
+				abort ();
+		}
+	}
+
+	// Preparing connection
+	fprintf(stderr, "irmc - Internet Relay Morse Code\n\n");
+	fprintf(stderr, "Connecting to %s:%s on channel %d with ID %s.\n", hostname, port, channel, id); 
+
+	prepare_id (&id_packet, id);
+	prepare_tx (&tx_data_packet, id);
+	connect_packet.channel = channel;
+	
+	signal(SIGINT, inthandler);
+	
+	memset(&hints, 0, sizeof hints);
+	hints.ai_family = AF_UNSPEC; /* ipv4 or ipv6 */
+	hints.ai_socktype = SOCK_DGRAM;
+
+	if ((rv = getaddrinfo(hostname, port, &hints, &servinfo)) != 0) {
+		fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
+		return 1;
+	}
+	
+	/* Find the first free socket */
+	for(p = servinfo; p != NULL; p = p->ai_next) {
+		if ((fd_socket = socket(p->ai_family, p->ai_socktype,
+			p->ai_protocol)) == -1) {
+			perror("irmc: socket");
+			continue;
+		}
+
+		if (connect(fd_socket, p->ai_addr, p->ai_addrlen) == -1) {
+			close(fd_socket);
+			perror("irmc: connect");
+			continue;
+		}
+
+		break;
+	}
+    
+    	fcntl(fd_socket, F_SETFL, O_NONBLOCK);
+	if (p == NULL) {
+		fprintf(stderr, "Failed to connect.\n");
+		return 2;
+	}
+
+	inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
+			s, sizeof s);
+	fprintf(stderr, "Connected to %s.\n", s);
+
+#ifdef TX_SERIAL
+	fd_serial = open(serialport, O_RDWR | O_NOCTTY | O_NDELAY);
+	if(fd_serial == -1) {
+    		fprintf(stderr,"Unable to open serial port %s.\n", serialport);
+    	}
+#endif
+
+#ifdef RASPI
+	if (wiringPiSetup() == -1)
+	{
+    		fprintf(stderr,"Unable to setup wiringPi for PIN %d\n", TX_RASPI_PIN);
+		exit (1);
+	}
+	pinMode(TX_RASPI_PIN, INPUT);
+#endif
+ 
+	freeaddrinfo(servinfo); /* all done with this structure */
+
+	key_release_t1 = fastclock();
+	identifyclient();
+   
+	beep_init();
+
+	/* Main Loop */
+	for(;;) {
+  		if(tx_timer == 0) 
+			if((numbytes = recv(fd_socket, buf, MAXDATASIZE-1, 0)) == -1)
+				usleep(250);
+		if(numbytes == SIZE_DATA_PACKET && tx_timer == 0){
+			memcpy(&rx_data_packet, buf, SIZE_DATA_PACKET);
+
+		#if DEBUG  
+			printf("length: %i\n", rx_data_packet.length);
+			printf("id: %s\n", rx_data_packet.id);
+			printf("sequence no.: %i\n", rx_data_packet.sequence);
+			printf("version: %s\n", rx_data_packet.status);
+			printf("n: %i\n", rx_data_packet.n);
+			printf("code:\n");
+			for(i = 0; i < SIZE_CODE; i++)printf("%i ", rx_data_packet.code[i]); printf("\n");
+		#endif
+
+			if(rx_data_packet.n > 0 && rx_sequence != rx_data_packet.sequence){
+				message(2);
+				if(translate == 1){
+					printf("%s", rx_data_packet.status);
+					fflush(0);
+				}
+				rx_sequence = rx_data_packet.sequence;
+				for(i = 0; i < rx_data_packet.n; i++){
+					switch(rx_data_packet.code[i]){
+					case 1:
+						message(3);
+						break;
+					case 2:
+						message(4);
+						break;
+					default:
+						if(audio_status == 1)
+						{ 
+
+							int length = rx_data_packet.code[i];
+							if(length == 0 || abs(length) > 2000) {
+							}
+							else
+							{
+								if(length < 0) {
+									beep(0.0, abs(length)/1000.);
+								}
+								else
+								{
+									beep(1000.0, length/1000.);
+								}
+							}
+						}
+						break;
+					}
+				}
+			}
+		}
+	
+		if(tx_timer > 0) tx_timer--;
+		if(tx_data_packet.n > 1 ){
+			tx_sequence++;
+			tx_data_packet.sequence = tx_sequence;
+			for(i = 0; i < 5; i++) send(fd_socket, &tx_data_packet, SIZE_DATA_PACKET, 0);
+		#if DEBUG		
+			printf("irmc: sent data packet.\n");
+		#endif
+			tx_data_packet.n = 0;
+		}
+#ifdef TX_SERIAL
+		ioctl(fd_serial,TIOCMGET, &serial_status);
+		if(serial_status & TIOCM_DSR){
+			txloop();
+			tx_timer = TX_WAIT;
+			message(1);
+		}
+#endif
+
+#ifdef RASPI
+		if(digitalRead(5)==1){
+			txloop();
+			tx_timer = TX_WAIT;
+			message(1);
+		}
+#endif
+		
+		if(keepalive_t < 0 && tx_timer == 0){
+		#if DEBUG
+			printf("keep alive sent.\n");
+		#endif
+			identifyclient();
+			keepalive_t = KEEPALIVE_CYCLE;
+		}
+		if(tx_timer == 0) {
+			keepalive_t--;
+			usleep(50);	
+		}		
+
+		if(kbhit() && tx_timer == 0){
+			getchar(); /* flush the buffer */
+		}
+	} /* End of mainloop */
+
+	send(fd_socket, &disconnect_packet, SIZE_COMMAND_PACKET, 0);	
+	close(fd_socket);
+#ifdef TX_SERIAL
+	close(fd_serial);
+#endif
+	buzzer_stop();
+
+	exit(0); 
+}
+

src/util.c

@@ -0,0 +1,57 @@
+
+#include "util.h"
+
+/* portable time, as listed in https://gist.github.com/jbenet/1087739  */
+void current_utc_time(struct timespec *ts) {
+#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
+  clock_serv_t cclock;
+  mach_timespec_t mts;
+  host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
+  clock_get_time(cclock, &mts);
+  mach_port_deallocate(mach_task_self(), cclock);
+  ts->tv_sec = mts.tv_sec;
+  ts->tv_nsec = mts.tv_nsec;
+#else
+  clock_gettime(CLOCK_REALTIME, ts);
+#endif
+}
+
+
+/* a better clock() in milliseconds */
+long fastclock(void)
+{
+	struct timespec t;
+	long r;
+
+	current_utc_time (&t);
+	r = t.tv_sec * 1000;
+	r = r + t.tv_nsec / 1000000;
+	return r;
+}
+
+int kbhit (void)
+{
+  	struct timeval tv;
+  	fd_set rdfs;
+
+  	tv.tv_sec = 0;
+  	tv.tv_usec = 0;
+
+  	FD_ZERO(&rdfs);
+  	FD_SET (STDIN_FILENO, &rdfs);
+
+  	select (STDIN_FILENO+1, &rdfs, NULL, NULL, &tv);
+  	return FD_ISSET(STDIN_FILENO, &rdfs);
+}
+
+/* get sockaddr, IPv4 or IPv6: */
+void *get_in_addr(struct sockaddr *sa)
+{
+	if (sa->sa_family == AF_INET) {
+		return &(((struct sockaddr_in*)sa)->sin_addr);
+	}
+
+	return &(((struct sockaddr_in6*)sa)->sin6_addr);
+}
+
+

src/util.h

@@ -0,0 +1,30 @@
+#include <time.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <netdb.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <math.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <signal.h>
+#include <arpa/inet.h>
+
+
+#ifdef __MACH__
+    #include <mach/clock.h>
+    #include <mach/mach.h>
+#endif
+
+
+void current_utc_time(struct timespec *ts);
+long fastclock(void);
+int kbhit (void);
+void *get_in_addr(struct sockaddr *sa);
+