added simple sml_server example, updated README

README.markdown

@@ -1,5 +0,0 @@
-libSML
-======
-
-Implementation in C of the Smart Messaging Language (SML) protocol
-

README.md

@@ -0,0 +1,11 @@
+libSML is a library which implements the Smart Messaging Language (SML) protocol specified by VDE's Forum Netztechnik/Netzbetrieb (FNN).
+It can be utilized to communicate to FNN specified Smart Meters (EDL/MUC).
+
+# Version
+This is an alpha version, meaning the basics are implemented but there is still some work to do.
+
+# Usage
+Examples how to use libSML are in the examples directory.
+
+# License
+libSML is licensed with the GPL, other licenses are available.

examples/Makefile

@@ -0,0 +1,11 @@
+CFLAGS += -I../sml/include/ -g -Wall
+OBJS = sml_server.o
+LIBS = -L../sml/lib/ ../sml/lib/libsml.o
+
+sml_server : $(OBJS)
+	$(CC) $(CFLAGS) $(LIBS) -o sml_server $(OBJS)
+
+.PHONY: clean
+clean:
+	@rm -f *.o
+	@rm -f sml_server

examples/sml_server.c

@@ -0,0 +1,53 @@
+// Copyright 2011 Juri Glass, Mathias Runge, Nadim El Sayed 
+// DAI-Labor, TU-Berlin
+// 
+// This file is part of libSML.
+// 
+// libSML 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 3 of the License, or
+// (at your option) any later version.
+// 
+// libSML 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 libSML.  If not, see <http://www.gnu.org/licenses/>.
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sml/sml.h>
+#include <sml/sml_transport.h>
+
+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
+    sml_file_print(file);
+    
+    // all elements returned by parsing functions must be free'd
+    sml_file_free(file);
+}
+
+int main(int argc, char **argv) {
+    char *device = "your device here";
+    
+    // this depends on your device (serial port, ip)
+    int fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
+    if (fd < 0) {
+        printf("error: %s - %s\n", device, strerror(errno));
+        return -1;
+    }
+    
+    // this is a blocking call
+    sml_transport_listen(fd, &transport_receiver);
+    
+    close(fd);
+    return 0;
+}

sml/include/sml/sml.h

@@ -21,25 +21,28 @@
 
 #include "sml_message.h"
 #include "sml_shared.h"
-
 #include <stdlib.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+// a SML file consist of multiple SML messages
 typedef struct {
     sml_message **messages;
     short messages_len;
     sml_buffer *buf;
 } sml_file;
 
-// Parses a SML file.
+// parses a SML file.
 sml_file *sml_file_parse(unsigned char *buffer, size_t buffer_len);
+
 sml_file *sml_file_init();
 void sml_file_add_message(sml_file *file, sml_message *message);
 void sml_file_write(sml_file *file);
+
 void sml_file_free(sml_file *file);
+
 void sml_file_print(sml_file *file);
 
 #ifdef __cplusplus

sml/src/sml.c

@@ -31,8 +31,6 @@
 
 sml_file *sml_file_parse(unsigned char *buffer, size_t buffer_len) {
     
-	//buffer += 8;
-	//buffer_len -= 16;
     sml_file *file = (sml_file*) malloc(sizeof(sml_file));
     memset(file, 0, sizeof(sml_file));
     
@@ -51,16 +49,16 @@ sml_file *sml_file_parse(unsigned char *buffer, size_t buffer_len) {
             continue;
         }
         
-		msg = sml_message_parse(buf);
-		
+        msg = sml_message_parse(buf);
+        
         if (sml_buf_has_errors(buf)) {
-			printf("warning: could not read the whole file\n");
-           break;
+            printf("warning: could not read the whole file\n");
+            break;
         }
 
         sml_file_add_message(file, msg);
 
-	}
+    }
     return file;
 }