/*
 * UNO Monitor Daemon v.0.1.0
 * Kidacro <kidacro@archamedis.net>
 * https://kidacro.archamedis.net/git/kidacro/Arduino/src/branch/main/uno-stats-monitor
 *
 * monitor_daemon.c - Sends and Receives commands to UNO Monitor over serial connection
 *
 * Input Schema:
 *  Start char is: '#'
 *  End char is: '@'
 *  2nd char denotes which line number/mode to use
 *
 * Setting Schema:
 *  LCDLength:LCDRows:LCDDelay:LEDBrightness:LEDDelay
 *  16:2:5:0:3
 *
 * Example:
 *  Line 1: #1Archamedis Status@
 *  Line 2: #299% free / etc.@
 *  LAVG -: #324@
 *  LSET 0: #16:2:5:0:3@
 *
 * Output Schema:
 *  Multimedia Controls use single characters to denote which button was pressed
 *    P power
 *    M mute
 *    m mode
 *    p pause/play
 *    b back
 *    f forward
 *    e eq
 *    - vol down
 *    + vol up
 *    r return
 *    u usb scan
 *     0 number 0
 *    1 number 1
 *    2 number 2
 *    3 number 3
 *    4 number 4
 *    5 number 5
 *    6 number 6
 *    7 number 7
 *    8 number 8
 *    9 number 9
 *    R repeat
 *    Z other button pressed
 */

// C library
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <syslog.h>
#include <signal.h>
#include <getopt.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <errno.h>
#include <termios.h>
#include <time.h>

// external libs
#include <libconfig.h>

#define MAX_ENTRIES 10

// global variables
int debug = 0;
int running = 0;
char *conf_file_name = "unomond.conf";
char *pid_file_name = "/tmp/unomond.pid";
int pid_fd = -1;
const char *app_name = "UnomonD v.0.1.0";
FILE *log_stream;
char *log_file_name = NULL;
int serial_port;
struct termios tty;
struct timeval __millis_start;

// config file settings
int delay = 5000;
int line_length = 16;
int line_count = 2;
int lcd_delay = 5;
int led_brightness = 5;
int led_delay = 3;
const char *cpu_temp_file = "";
const char *cpu_fanspeed_file = "";
char *drive_free_space[MAX_ENTRIES];
int drive_free_space_count;
const char *ttydevice = "/dev/ttyACM0";
const char *ircmd_P = ""; // power
const char *ircmd_M = ""; // mute
const char *ircmd_m = ""; // mode
const char *ircmd_p = ""; // pause/play
const char *ircmd_b = ""; // back
const char *ircmd_f = ""; // forward
const char *ircmd_e = ""; // eq
const char *ircmd_minus = ""; // vol down
const char *ircmd_plus = ""; // vol up
const char *ircmd_r = ""; // return
const char *ircmd_u = ""; // usb scan
const char *ircmd_0 = ""; // number 0
const char *ircmd_1 = ""; // number 1
const char *ircmd_2 = ""; // number 2
const char *ircmd_3 = ""; // number 3
const char *ircmd_4 = ""; // number 4
const char *ircmd_5 = ""; // number 5
const char *ircmd_6 = ""; // number 6
const char *ircmd_7 = ""; // number 7
const char *ircmd_8 = ""; // number 8
const char *ircmd_9 = ""; // number 9
const char *ircmd_R = ""; // repeat
const char *ircmd_Z = ""; // other button pressed

// function prototypes
void init_millis();
unsigned long int millis();
char* timestamp();
bool file_exists(const char *filename);
int read_conf_file(int reload);
void handle_signal(int sig);
static void daemonize();
void print_help(void);
int serial_open_port();
int listen_server();
void send_stats();
void send_settings();
void log_method();

// from gather_stats.c
void get_stats();

// local functions
void init_millis() 
{
    gettimeofday(&__millis_start, NULL);
}

unsigned long int millis() 
{
    long mtime, seconds, useconds;
    struct timeval end;
    gettimeofday(&end, NULL);
    seconds  = end.tv_sec  - __millis_start.tv_sec;
    useconds = end.tv_usec - __millis_start.tv_usec;
    mtime = ((seconds) * 1000 + useconds/1000.0) + 0.5;
    return mtime;
}

char* timestamp()
{
	unsigned size = 300; 
	char* buffer = malloc(size);
	//char time_s;
    time_t ltime; /* calendar time */
    ltime=time(NULL); /* get current cal time */
    //time_s = sprintf("%s",asctime( localtime(&ltime) ) );
	snprintf(buffer, size, "%s", asctime( localtime(&ltime) ));
	return buffer;
}

bool file_exists(const char *filename)
{
    FILE *fp = fopen(filename, "r");
    bool is_exist = false;
    if(fp != NULL) {
        is_exist = true;
        fclose(fp); // close the file
    }
    return is_exist;
}

// read from config file
int read_conf_file(int reload) 
{
	int ret = -1, n = 0;
    config_t cfg;
	config_setting_t *drive_free_space_entries;
	char *mydrive;
	const char *myttydevice;
	const char *mylogfile;
	const char *mycpu_temp_file;
	const char *mycpu_fanspeed_file;
	const char *myircmd_P;
	const char *myircmd_M;
	const char *myircmd_m;
	const char *myircmd_p;
	const char *myircmd_b;
	const char *myircmd_f;
	const char *myircmd_e;
	const char *myircmd_minus;
	const char *myircmd_plus;
	const char *myircmd_r;
	const char *myircmd_u;
	const char *myircmd_0;
	const char *myircmd_1;
	const char *myircmd_2;
	const char *myircmd_3;
	const char *myircmd_4;
	const char *myircmd_5;
	const char *myircmd_6;
	const char *myircmd_7;
	const char *myircmd_8;
	const char *myircmd_9;
	const char *myircmd_R;
	const char *myircmd_Z;

	if(conf_file_name == NULL) {
		syslog(LOG_INFO, "Configuration file: %s is empty or not valid.\n",conf_file_name);
		return(EXIT_FAILURE);
	}

    // check if conf file exists
	if(!file_exists(conf_file_name)) {
		return(EXIT_FAILURE);
	}

	// read the file
	config_init(&cfg);
    if(!config_read_file(&cfg, conf_file_name)) {
        syslog(LOG_INFO, "%s:%d - %s\n", config_error_file(&cfg),
        config_error_line(&cfg), config_error_text(&cfg));
        config_destroy(&cfg);
		syslog(LOG_INFO, "Can not open configuration file: %s.\n",conf_file_name);
        return(EXIT_FAILURE);
    }

	// logfile (lookup logfile first and if found do a log_method to reload it)
    if(config_lookup_string(&cfg, "logfile", &mylogfile)) {
		log_file_name = strdup(mylogfile);
		log_method();
        fprintf(log_stream, "Config: Using 'logfile': %s\n", mylogfile);
    }
    else {
        syslog(LOG_INFO, "No 'logfile' setting in configuration file, using default stderr output.\n");
    }

    // load the base config
	// delay
    if(config_lookup_int(&cfg, "delay", &delay)) {
        fprintf(log_stream, "Config: Using 'delay': %i\n",delay);
    }
    else {
        fprintf(log_stream, "No 'delay' setting in configuration file, using default delay of %i.\n",delay);
    }

	// ttydevice
    if(config_lookup_string(&cfg, "tty", &myttydevice)) {
		ttydevice = strdup(myttydevice);
        fprintf(log_stream, "Config: Using 'TTY': %s\n",ttydevice);
    }
    else {
        fprintf(log_stream, "No 'tty' setting in configuration file, using default tty of %s.\n",ttydevice);
    }

	// line_length
	if(config_lookup_int(&cfg, "line_length", &line_length)) {
        fprintf(log_stream, "Config: Using 'line_length': %i\n",line_length);
    }
    else {
        fprintf(log_stream, "No 'line_length' setting in configuration file, using default line_length of %i.\n",line_length);
    }

	// line_count
	if(config_lookup_int(&cfg, "line_count", &line_count)) {
        fprintf(log_stream, "Config: Using 'line_count': %i\n",line_count);
    }
    else {
        fprintf(log_stream, "No 'line_count' setting in configuration file, using default line_count of %i.\n",line_count);
    }

	// led_brightness
	if(config_lookup_int(&cfg, "led_brightness", &led_brightness)) {
        fprintf(log_stream, "Config: Using 'led_brightness': %i\n",led_brightness);
    }
    else {
        fprintf(log_stream, "No 'led_brightness' setting in configuration file, using default led_brightness of %i.\n",led_brightness);
    }

	// led_delay
	if(config_lookup_int(&cfg, "led_delay", &led_delay)) {
        fprintf(log_stream, "Config: Using 'led_delay': %i\n",led_delay);
    }
    else {
        fprintf(log_stream, "No 'led_delay' setting in configuration file, using default led_delay of %i.\n",led_delay);
    }

	// lcd_delay
	if(config_lookup_int(&cfg, "lcd_delay", &lcd_delay)) {
        fprintf(log_stream, "Config: Using 'lcd_delay': %i\n",lcd_delay);
    }
    else {
        fprintf(log_stream, "No 'lcd_delay' setting in configuration file, using default lcd_delay of %i.\n",lcd_delay);
    }

	// cpu stats settings
	if(config_lookup_string(&cfg, "cpu_temp_file", &mycpu_temp_file)) {
		cpu_temp_file = strdup(mycpu_temp_file);
	}

	if(config_lookup_string(&cfg, "cpu_fanspeed_file", &mycpu_fanspeed_file)) {
		cpu_fanspeed_file = strdup(mycpu_fanspeed_file);
	}

    // IR commands
    if(config_lookup_string(&cfg, "ircmd_P", &myircmd_P)) { ircmd_P = strdup(myircmd_P); }
    if(config_lookup_string(&cfg, "ircmd_M", &myircmd_M)) { ircmd_M = strdup(myircmd_M); }
    if(config_lookup_string(&cfg, "ircmd_m", &myircmd_m)) { ircmd_m = strdup(myircmd_m); }
    if(config_lookup_string(&cfg, "ircmd_p", &myircmd_p)) { ircmd_p = strdup(myircmd_p); }
    if(config_lookup_string(&cfg, "ircmd_b", &myircmd_b)) { ircmd_b = strdup(myircmd_b); }
    if(config_lookup_string(&cfg, "ircmd_f", &myircmd_f)) { ircmd_f = strdup(myircmd_f); }
    if(config_lookup_string(&cfg, "ircmd_e", &myircmd_e)) { ircmd_e = strdup(myircmd_e); }
    if(config_lookup_string(&cfg, "ircmd_minus", &myircmd_minus)) { ircmd_minus = strdup(myircmd_minus); }
    if(config_lookup_string(&cfg, "ircmd_plus", &myircmd_plus)) { ircmd_plus = strdup(myircmd_plus); }
    if(config_lookup_string(&cfg, "ircmd_r", &myircmd_r)) { ircmd_r = strdup(myircmd_r); }
    if(config_lookup_string(&cfg, "ircmd_u", &myircmd_u)) { ircmd_u = strdup(myircmd_u); }
    if(config_lookup_string(&cfg, "ircmd_0", &myircmd_0)) { ircmd_0 = strdup(myircmd_0); }
    if(config_lookup_string(&cfg, "ircmd_1", &myircmd_1)) { ircmd_1 = strdup(myircmd_1); }
    if(config_lookup_string(&cfg, "ircmd_2", &myircmd_2)) { ircmd_2 = strdup(myircmd_2); }
    if(config_lookup_string(&cfg, "ircmd_3", &myircmd_3)) { ircmd_3 = strdup(myircmd_3); }
    if(config_lookup_string(&cfg, "ircmd_4", &myircmd_4)) { ircmd_4 = strdup(myircmd_4); }
    if(config_lookup_string(&cfg, "ircmd_5", &myircmd_5)) { ircmd_5 = strdup(myircmd_5); }
    if(config_lookup_string(&cfg, "ircmd_6", &myircmd_6)) { ircmd_6 = strdup(myircmd_6); }
    if(config_lookup_string(&cfg, "ircmd_7", &myircmd_7)) { ircmd_7 = strdup(myircmd_7); }
    if(config_lookup_string(&cfg, "ircmd_8", &myircmd_8)) { ircmd_8 = strdup(myircmd_8); }
    if(config_lookup_string(&cfg, "ircmd_9", &myircmd_9)) { ircmd_9 = strdup(myircmd_9); }
    if(config_lookup_string(&cfg, "ircmd_0", &myircmd_0)) { ircmd_0 = strdup(myircmd_0); }
    if(config_lookup_string(&cfg, "ircmd_R", &myircmd_R)) { ircmd_R = strdup(myircmd_R); }
    if(config_lookup_string(&cfg, "ircmd_Z", &myircmd_Z)) { ircmd_Z = strdup(myircmd_Z); }

	// free drive space settings
	drive_free_space_entries = config_lookup(&cfg, "drive_free_space");
	drive_free_space_count = config_setting_length(drive_free_space_entries);
	fprintf(log_stream,"Config: I have %d free drive space entries:\n", drive_free_space_count);

	for(n = 0; n < drive_free_space_count; n++) {
		mydrive = strdup(config_setting_get_string_elem(drive_free_space_entries, n));
		drive_free_space[n] = strdup(mydrive);

		fprintf(log_stream,"\t#%d. %s\n", n + 1,
		config_setting_get_string_elem(drive_free_space_entries, n));
	}

    // report to syslog
	if(reload == 1) {
		syslog(LOG_INFO, "Reloaded configuration file %s of %s", conf_file_name, app_name);
	}
	else {
		syslog(LOG_INFO, "Configuration of %s read from file %s", app_name, conf_file_name);
	}

	config_destroy(&cfg);
	return ret;
}

void handle_signal(int sig)
{
    int lock_result = 0;

	if(sig == SIGINT) {
		syslog(LOG_INFO, "Received INT signal, Stopping daemon ...");

		/* Unlock and close lockfile */
		if(pid_fd != -1) {
            lock_result = lockf(pid_fd, F_ULOCK, 0);
			if(lock_result < 0) {
				syslog(LOG_INFO, "Lockfile could not be unlocked.");
			}
			close(pid_fd);
		}

		/* Try to delete lockfile */
		if(pid_file_name != NULL) {
			unlink(pid_file_name);
		}
		running = 0;

		/* Reset signal handling to default behavior */
		signal(SIGINT, SIG_DFL);

		running = 0;
		return;
	}
	else if (sig == SIGHUP) {
		syslog(LOG_INFO, "Received HUP signal, Reloading daemon config file ...");
		read_conf_file(1);
	}
	else if (sig == SIGCHLD) {
		syslog(LOG_INFO, "Received SIGCHLD signal... but I have no kids!.");
		return;
	}
}

static void daemonize()
{
	pid_t pid = 0;
    int myfd = -1;
    int chdir_result = 0;
    int write_result = 0;

	/* Fork off the parent process */
	pid = fork();

	/* An error occurred */
	if(pid < 0) {
		exit(EXIT_FAILURE);
	}

	/* Success: Let the parent terminate */
	if(pid > 0) {
		exit(EXIT_SUCCESS);
	}

	/* On success: The child process becomes session leader */
	if(setsid() < 0) {
		exit(EXIT_FAILURE);
	}

	/* Ignore signal sent from child to parent process */
	signal(SIGCHLD, SIG_IGN);

	/* Fork off for the second time*/
	pid = fork();

	/* An error occurred */
	if(pid < 0) {
		exit(EXIT_FAILURE);
	}

	/* Success: Let the parent terminate */
	if(pid > 0) {
		exit(EXIT_SUCCESS);
	}

	/* Set new file permissions */
	umask(0);

	/* Change the working directory to the root directory */
	/* or another appropriated directory */
    chdir_result = chdir("/");
	if(chdir_result <0) {
		syslog(LOG_INFO, "Could not change to our working directory.");
	}

	/* Close all open file descriptors */
    for(myfd = sysconf(_SC_OPEN_MAX); myfd > 0; myfd--) {
        close(myfd);
	}

    /* Reopen stdin (myfd = 0), stdout (myfd = 1), stderr (myfd = 2) */
	stdin = fopen("/dev/null", "r");
	stdout = fopen("/dev/null", "w+");
	stderr = fopen("/dev/null", "w+");

	/* Try to write PID of daemon to lockfile */
	if(pid_file_name != NULL) {
		char str[256];
		pid_fd = open(pid_file_name, O_RDWR|O_CREAT, 0640);
		if(pid_fd < 0) {
			/* Can't open lockfile */
			exit(EXIT_FAILURE);
		}

		if(lockf(pid_fd, F_TLOCK, 0) < 0) {
			/* Can't lock file */
			exit(EXIT_FAILURE);
		}

		/* Get current PID */
		sprintf(str, "%d\n", getpid());

		/* Write PID to lockfile */
        write_result = write(pid_fd, str, strlen(str));
		if(write_result < 0) {
			syslog(LOG_INFO, "PID could not be written to lockfile.");
		}
	}
}

void print_help(void)
{
	printf("\n Usage: %s [OPTIONS]\n\n", app_name);
	printf("  Options:\n");
	printf("   -h --help                 Print this help\n");
	printf("   -c --conf_file filename   Read configuration from the file\n");
	printf("   -l --log_file  filename   Write logs to the file\n");
	printf("   -d --daemon               Daemonize this application\n");
	printf("   -D --debug                Debug this application\n");
	printf("   -n --tty       /dev/tty*  TTY device to connect to\n");
	printf("   -p --pid_file  filename   PID file used by daemonized app\n");
	printf("\n");
}

/* Open Serial Port */
int serial_open_port()
{
	serial_port = open(ttydevice, O_RDWR);

	// Read in existing settings, and handle any error
	if(tcgetattr(serial_port, &tty) != 0) {
        fprintf(log_stream, "Error %i from tcgetattr in open ttydevice: %s\n", errno, strerror(errno));
		syslog(LOG_INFO, "Could not open serial port! Exiting.");
		exit(EXIT_FAILURE);
	}

	tty.c_cflag &= ~PARENB; // Clear parity bit, disabling parity (most common)
	tty.c_cflag &= ~CSTOPB; // Clear stop field, only one stop bit used in communication (most common)
	tty.c_cflag &= ~CSIZE; // Clear all bits that set the data size
	tty.c_cflag |= CS8; // 8 bits per byte (most common)
	tty.c_cflag &= ~CRTSCTS; // Disable RTS/CTS hardware flow control (most common)
	tty.c_cflag |= CREAD | CLOCAL; // Turn on READ & ignore ctrl lines (CLOCAL = 1)

	tty.c_lflag &= ~ICANON;
	tty.c_lflag &= ~ECHO; // Disable echo
	tty.c_lflag &= ~ECHOE; // Disable erasure
	tty.c_lflag &= ~ECHONL; // Disable new-line echo
	tty.c_lflag &= ~ISIG; // Disable interpretation of INTR, QUIT and SUSP
	tty.c_iflag &= ~(IXON | IXOFF | IXANY); // Turn off s/w flow ctrl
	tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL); // Disable any special handling of received bytes

	tty.c_oflag &= ~OPOST; // Prevent special interpretation of output bytes (e.g. newline chars)
	tty.c_oflag &= ~ONLCR; // Prevent conversion of newline to carriage return/line feed
	// tty.c_oflag &= ~OXTABS; // Prevent conversion of tabs to spaces (NOT PRESENT ON LINUX)
	// tty.c_oflag &= ~ONOEOT; // Prevent removal of C-d chars (0x004) in output (NOT PRESENT ON LINUX)

	tty.c_cc[VTIME] = 10;    // Wait for up to 1s (10 deciseconds), returning as soon as any data is received.
	tty.c_cc[VMIN] = 0;

    // Set in/out baud rate to 9600
	cfsetispeed(&tty, B9600);
	cfsetospeed(&tty, B9600);

	// Save tty settings, also checking for error
	if(tcsetattr(serial_port, TCSANOW, &tty) != 0) {
        fprintf(log_stream, "Error %i from tcsetattr in save tty settings: %s\n", errno, strerror(errno));
		syslog(LOG_INFO, "Could not save serial port settings! Exiting.");
		exit(EXIT_FAILURE);
	}

	return 1;
}

/* Server */
int listen_server()
{
    char read_buf [2];
	int exec_result = 0;
    memset(&read_buf, '\0', sizeof(read_buf));
    int num_bytes = read(serial_port, &read_buf, sizeof(read_buf));

	// may be 0 if no bytes were received, and can also be -1 to signal an error.
	if(num_bytes < 0) {
        fprintf(log_stream, "Error reading: %s\n", strerror(errno));
		return 1;
	}

	// do stuff goes here
	// switch on read_buf
    // input proto: PMmpbfe-+ru0123456789RZ
    if(strcmp(read_buf,"P") == 0) { exec_result = system(ircmd_P); }
    if(strcmp(read_buf,"M") == 0) { exec_result = system(ircmd_M); }
    if(strcmp(read_buf,"m") == 0) { exec_result = system(ircmd_m); }
    if(strcmp(read_buf,"p") == 0) { exec_result = system(ircmd_p); }
    if(strcmp(read_buf,"b") == 0) { exec_result = system(ircmd_b); }
    if(strcmp(read_buf,"f") == 0) { exec_result = system(ircmd_f); }
    if(strcmp(read_buf,"e") == 0) { exec_result = system(ircmd_e); }
    if(strcmp(read_buf,"-") == 0) { exec_result = system(ircmd_minus); }
    if(strcmp(read_buf,"+") == 0) { exec_result = system(ircmd_plus); }
    if(strcmp(read_buf,"r") == 0) { exec_result = system(ircmd_r); }
    if(strcmp(read_buf,"u") == 0) { exec_result = system(ircmd_u); }
    if(strcmp(read_buf,"0") == 0) { exec_result = system(ircmd_0); }
    if(strcmp(read_buf,"1") == 0) { exec_result = system(ircmd_1); }
    if(strcmp(read_buf,"2") == 0) { exec_result = system(ircmd_2); }
    if(strcmp(read_buf,"3") == 0) { exec_result = system(ircmd_3); }
    if(strcmp(read_buf,"4") == 0) { exec_result = system(ircmd_4); }
    if(strcmp(read_buf,"5") == 0) { exec_result = system(ircmd_5); }
    if(strcmp(read_buf,"6") == 0) { exec_result = system(ircmd_6); }
    if(strcmp(read_buf,"7") == 0) { exec_result = system(ircmd_7); }
    if(strcmp(read_buf,"8") == 0) { exec_result = system(ircmd_8); }
    if(strcmp(read_buf,"9") == 0) { exec_result = system(ircmd_9); }
    if(strcmp(read_buf,"R") == 0) { exec_result = system(ircmd_R); }
    if(strcmp(read_buf,"Z") == 0) { exec_result = system(ircmd_Z); }

    if(exec_result != 0) {
        fprintf(log_stream, "Command for %s failed with %i bytes. Received message: %s\n", read_buf, num_bytes, read_buf);
		syslog(LOG_INFO, "Command for %s failed.",read_buf);
    }

    if(debug) {
        fprintf(log_stream, "Read %i bytes. Received message: %s\n", num_bytes, read_buf);
    }

	return 0;
}

// send stats
void send_stats(char *line_1, char *line_2, char *line_3)
{
    int write_result = 0;
	unsigned int mylen_1 = 0;
	unsigned int mylen_2 = 0;
	unsigned int mylen_3 = 0;

    // Line 1
	mylen_1 = strlen(line_1);
	write_result = write(serial_port, line_1, mylen_1);

    if(write_result < 0) {
        fprintf(log_stream, "Writing stats to serial report resulted in %i error. Size of message: %i\n", write_result, mylen_1);
		syslog(LOG_INFO, "Writing stats to serial report resulted in %i error.",write_result);
    }

	// Line 2
	mylen_2 = strlen(line_2);
	write_result = write(serial_port, line_2, mylen_2);

    if(write_result < 0) {
        fprintf(log_stream, "Writing stats to serial report resulted in %i error. Size of message: %i\n", write_result, mylen_2);
		syslog(LOG_INFO, "Writing stats to serial report resulted in %i error.",write_result);
    }

	// Line 3
	mylen_3 = strlen(line_3);
	write_result = write(serial_port, line_3, mylen_3);

    if(write_result < 0) {
        fprintf(log_stream, "Writing stats to serial report resulted in %i error. Size of message: %i\n", write_result, mylen_3);
		syslog(LOG_INFO, "Writing stats to serial report resulted in %i error.",write_result);
    }

	return;
}

/* Send settings to receiver */
// Setting Schema:
//  LCDLength:LCDRows:LCDDelay:LEDBrightness:LEDDelay
//  16:2:5:0:3
void send_settings() {
	char myline[16];
	unsigned int mylen = 0;
	int write_result = 0;

	sprintf(myline,"#0%i:%i:%i:%i:%i@",line_length,line_count,lcd_delay,led_brightness,led_delay);
	mylen = strlen(myline);
	write_result = write(serial_port, myline, mylen);

	if(write_result < 0) {
        fprintf(log_stream, "Writing settings to serial report resulted in %i error. Size of message: %i\n", write_result, mylen);
		syslog(LOG_INFO, "Writing settings to serial report resulted in %i error.",write_result);
    }

	return;
}

/* Daemon log method */
void log_method() {
	// close log file, if its open
	if(log_stream != stderr && log_stream != NULL) {
		fclose(log_stream);
	}

	// command line logfile takes precedence
	if(log_file_name != NULL && file_exists(log_file_name)) {
		log_stream = fopen(log_file_name, "a+");
		if(log_stream == NULL) {
			syslog(LOG_ERR, "Can not open log file: %s, error: %s", log_file_name, strerror(errno));
			log_stream = stderr; // stdout;
			return;
		}
		syslog(LOG_INFO, "Using logfile: %s\n",log_file_name);
	}

	// use stderr as failback
	else {
		log_stream = stderr; // stdout;
	}

	return;
}

/* Main function */
int main(int argc, char *argv[])
{
	static struct option long_options[] = {
		{"conf_file", required_argument, 0, 'c'},
		{"log_file", required_argument, 0, 'l'},
		{"help", no_argument, 0, 'h'},
		{"debug", no_argument, 0, 'D'},
		{"daemon", no_argument, 0, 'd'},
		{"pid_file", required_argument, 0, 'p'},
		{"tty", required_argument, 0, 'n'},
		{NULL, 0, 0, 0}
	};
	int value, option_index = 0;
	char *mytty = NULL;
	int start_daemonized = 0;

	// TODO: fix timestamps for logfile
	//fprintf(log_stream,"Timestamp %s\n",timestamp());

	/* Open system log and write startup message to it */
	openlog(argv[0], LOG_PID|LOG_CONS, LOG_DAEMON);
	syslog(LOG_INFO, "Started %s", app_name);

	/* Daemon will handle two signals */
	signal(SIGINT, handle_signal);
	signal(SIGHUP, handle_signal);

	/* Set default log method */
	log_method();

	/* Read configuration from config file
	 * dev: keep this b4 command line arguments so below takes precedence
	 */
	read_conf_file(0);

	/* Try to process all command line arguments */
	while((value = getopt_long(argc, argv, "c:l:p:n:dDh", long_options, &option_index)) != -1) {
		switch (value) {
			case 'c':
				conf_file_name = strdup(optarg);
				fprintf(log_stream, "Reloading configuation from command line...\n");
				read_conf_file(0);
                fprintf(log_stream, "Command Line: Using 'conffile': %s\n",conf_file_name);
				break;
			case 'l':
				log_file_name = strdup(optarg);
				log_method();
                fprintf(log_stream, "Command Line: Using 'logfile': %s\n",log_file_name);
				break;
			case 'p':
				pid_file_name = strdup(optarg);
                fprintf(log_stream, "Command Line: Using 'pidfile': %s\n",pid_file_name);
				break;
            case 'n':
				mytty = strdup(optarg);
				ttydevice = mytty;
                fprintf(log_stream, "Command Line: Using 'TTY': %s\n",ttydevice);
				break;
			case 'd':
				start_daemonized = 1;
                fprintf(log_stream, "Command Line: Daemonizing...\n");
				break;
			case 'D':
				debug = 1;
                fprintf(log_stream, "Command Line: Using Debugging\n");
				break;
            case 'h':
				print_help();
				return EXIT_SUCCESS;
			default:
				break;
		}
	}

	/* When daemonizing is requested at command line. */
	if(start_daemonized == 1) {
		daemonize();
	}

	/* This global variable can be changed in function handling signal */
	running = 1;

	/* Main loop */
	serial_open_port();
	send_settings();
	send_settings(); // yes twice due to the arduino getting reset on 1st access on linux (if not modified)
	init_millis();
	while(running == 1) {
		listen_server(); // listen for IR events (blocks for ~1 second at a time)

		if(debug) {
			fprintf(log_stream,"Elapsed time: %ld milliseconds\n", millis());
		}

		if(millis() >= (unsigned long)delay) {
        	get_stats(); // get and send stats if its time to do so (non blocking timer)
			init_millis(); // reset timer
		}
	}
	close(serial_port);

	/* Close log file, when it is used. */
	if(log_stream != stderr && log_stream != NULL) {
		fclose(log_stream);
	}

	/* Write system log and close it. */
	syslog(LOG_INFO, "Stopped %s.\n", app_name);
	closelog();

	return EXIT_SUCCESS;
}