udev and new libsml repo

sml/50-sml.rules

@@ -0,0 +1 @@
+SUBSYSTEMS=="usb", KERNEL=="ttyUSB*", ATTRS{manufacturer}=="Silicon Labs", ATTRS{serial}=="00xxxxxx", SYMLINK="sml0"

sml/README.md

@@ -5,8 +5,13 @@ First of all you need is a eHZ (Elektronischer Haushaltszähler) and an IrDA USB
 
 I used several information from the openHAB community, mainly from [this topic](https://community.openhab.org/t/using-a-power-meter-sml-with-openhab/21923/1).
 
-You need to get, modify and compile [libsml](https://github.com/dailab/libsml) from Github liked described [here](https://community.openhab.org/t/using-a-power-meter-sml-with-openhab/21923/1). I included my version of sml_server.c here as it differs a bit.
+You need to get, modify and compile [libsml](https://github.com/volkszaehler/libsml) (the [old libsml](https://github.com/dailab/libsml) is dead!) from Github liked described [here](https://community.openhab.org/t/using-a-power-meter-sml-with-openhab/21923/1) and in my comment about the new repository [further down in the thread](https://community.openhab.org/t/using-a-power-meter-sml-with-openhab/21923/12). But I included my version of sml_server.c (pulled and edited 2018/01/19) here as it differs a bit.
 
-* **sml.items**: Put this file into your */etc/openhab2/items*.
+If you like to have a fixed device name (e.g. */dev/sml0* instead of */dev/ttyUSB0*) which cannot change (it may if you plug in another USB device), please use the *50-sml.rules* file and modify it. To find our the serial and maybe also different manufacturer of our device use the following command to display USB device properties:
+```
+lsusb -v
+```
+* **50-sml.rules**: Put this file into your */etc/udev/rules.d* directory and modify it for your specific setup.
+* **sml.items**: Put this file into your */etc/openhab2/items* directory.
 * **sml.rules**: Put this file into your */etc/openhab2/rules* directory and modify it for your specific setup. In my case the compiled sml_server is in */home/openhabian/src/libsml/examples*. You also might need to adjust the device name, in my case it is: */dev/ttyUSB0*
 * **sml_server.c**: Put this file into the *libsml* subdirectory *src/libsml/examples* and compile *libsml* with this file, not the original one.

sml/sml.rules

@@ -3,7 +3,7 @@ rule "EHZ"
 		Time cron "0,30 */1 * * * ?" // this one cycles every 30 seconds. depends on your needs
 	then
 		// getting the payload of the meter
-		var String meter_payload = executeCommandLine("/home/openhabian/src/libsml/examples/sml_server /dev/ttyUSB0", 5000) // note the argument /dev/ttyUSB0 - your meter-device-id goes here
+		var String meter_payload = executeCommandLine("/home/openhabian/volkszaehler/libsml/examples/sml_server /dev/ttyUSB0", 5000) // note the argument /dev/ttyUSB0 or /dev/sml0 - your meter-device-id goes here
 		// splitting the payload - first in lines, then getting counterStr and consumptionStr with delimiter "#"
 		val lines = meter_payload.split('\n')
 		val counterStr = lines.get(0).split('#').get(1)

sml/sml_server.c

@@ -2,6 +2,9 @@
 // DAI-Labor, TU-Berlin
 //
 // This file is part of libSML.
+// Thanks to Thomas Binder and Axel (tuxedo) for providing code how to
+// print OBIS data (see transport_receiver()).
+// https://community.openhab.org/t/using-a-power-meter-sml-with-openhab/21923
 //
 // libSML is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -22,20 +25,30 @@
 #include <errno.h>
 #include <termios.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <string.h>
+#include <math.h>
 #include <sys/ioctl.h>
 
 #include <sml/sml_file.h>
 #include <sml/sml_transport.h>
+#include <sml/sml_value.h>
 
 int serial_port_open(const char* device) {
 	int bits;
 	struct termios config;
 	memset(&config, 0, sizeof(config));
 
+	if (!strcmp(device, "-"))
+		return 0; // read stdin when "-" is given for the device
+
+#ifdef O_NONBLOCK
+	int fd = open(device, O_RDWR | O_NOCTTY | O_NONBLOCK);
+#else
 	int fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
+#endif
 	if (fd < 0) {
-		printf("error: open(%s): %s\n", device, strerror(errno));
+		fprintf(stderr, "error: open(%s): %s\n", device, strerror(errno));
 		return -1;
 	}
 
@@ -44,38 +57,24 @@ int serial_port_open(const char* device) {
 	bits |= TIOCM_RTS;
 	ioctl(fd, TIOCMSET, &bits);
 
-	tcgetattr( fd, &config ) ;
+	tcgetattr(fd, &config);
 
 	// set 8-N-1
-	config.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+	config.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR
+			| ICRNL | IXON);
 	config.c_oflag &= ~OPOST;
 	config.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
 	config.c_cflag &= ~(CSIZE | PARENB | PARODD | CSTOPB);
 	config.c_cflag |= CS8;
 
 	// set speed to 9600 baud
-	cfsetispeed( &config, B9600);
-	cfsetospeed( &config, B9600);
+	cfsetispeed(&config, B9600);
+	cfsetospeed(&config, B9600);
 
 	tcsetattr(fd, TCSANOW, &config);
 	return fd;
 }
 
-//void transport_receiver(unsigned char *buffer, size_t buffer_len) {
-//	// the buffer contains the whole message, with transport escape sequences.
-//	// these escape sequences are stripped here.
-//	sml_file *file = sml_file_parse(buffer + 8, buffer_len - 16);
-//	// the sml file is parsed now
-
-//	// read here some values ..
-
-//	// this prints some information about the file
-//	sml_file_print(file);
-
-//	// free the malloc'd memory
-//	sml_file_free(file);
-//}
-
 void transport_receiver(unsigned char *buffer, size_t buffer_len) {
    // Danke an Axel (tuxedo) für seinen Beispielcode
    int i;
@@ -117,19 +116,25 @@ void transport_receiver(unsigned char *buffer, size_t buffer_len) {
    }
 }
 
-int main(int argc, char **argv) {
+int main(int argc, char *argv[]) {
 	// this example assumes that a EDL21 meter sending SML messages via a
 	// serial device. Adjust as needed.
-	// char *device = "/dev/cu.usbserial";
-	char *device=argv[1];
-	int fd = serial_port_open(device);
+	if (argc != 2) {
+		printf("Usage: %s <device>\n", argv[0]);
+		printf("device - serial device of connected power meter e.g. /dev/cu.usbserial, or - for stdin\n");
+		exit(1); // exit here
+	}
+
+	// open serial port
+	int fd = serial_port_open(argv[1]);
+	if (fd < 0) {
+		printf("Error: failed to open device (%s)\n", argv[1]);
+		exit(3);
+	}
 
-	if (fd > 0) {
 	// listen on the serial device, this call is blocking.
 	sml_transport_listen(fd, &transport_receiver);
 	close(fd);
-	}
 
 	return 0;
 }
-