diff --git a/README.md b/README.md
index 1fd147c..1c716f4 100644
--- a/README.md
+++ b/README.md
@@ -6,4 +6,7 @@ If you find problems or errors, please [let me know](https://www.sebald.com/kont
The stuff I provide is based on [openHABian](http://docs.openhab.org/installation/openhabian.html) on a Raspberry Pi 3 using openHAB 2.1 and sometimes might reflect on my own (sometimes special) hardware and environment in and around my house.
## presence
-Wifi Presence - Detect a person with his/her smartphone entering or leaving the wireless home network (based on a Fritzbox and two DD-WRT based access points).
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+Wifi Presence - Detect a person with his/her smartphone entering or leaving the wireless home network (based on a Fritzbox and two DD-WRT based access points).
+
+## sml
+Read data from a power meter (eHZ) using Smart Message Language (SML).
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diff --git a/sml/README.md b/sml/README.md
new file mode 100644
index 0000000..f0ad8b0
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+++ b/sml/README.md
@@ -0,0 +1,12 @@
+# Power Meter with SML
+Read data from a power meter (eHZ) using Smart Message Language (SML).
+
+First of all you need a IrDA USB dongle like described [here](https://wiki.volkszaehler.org/hardware/controllers/ir-schreib-lesekopf). I got mine from Udo ([Volkszaehler](http://volkszaehler.org)) but it looks like he is not selling these anymore. What I found is [this link](https://shop.weidmann-elektronik.de/index.php?page=product&info=24) to a shop selling these dongles.
+
+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.
+
+* **sml.items**: Put this file into your */etc/openhab2/items*.
+* **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*.
+* **sml_server.c**: Put this file into the *libsml* subdirectory *src/libsml/examples* directory and compile *libsml*.
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diff --git a/sml/sml.items b/sml/sml.items
new file mode 100644
index 0000000..da40741
--- /dev/null
+++ b/sml/sml.items
@@ -0,0 +1,2 @@
+Number EHZ_consumption_power "power consumption [%.1f kwh]"
+Number EHZ_status_power "power status [%.1f kwh]"
diff --git a/sml/sml.rules b/sml/sml.rules
new file mode 100644
index 0000000..dc5ac34
--- /dev/null
+++ b/sml/sml.rules
@@ -0,0 +1,14 @@
+rule "EHZ"
+ when
+ 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
+ // 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)
+ val consumptionStr = lines.get(2).split('#').get(1)
+ // Updating the items
+ if (EHZ_status_power.state != counterStr) EHZ_status_power.sendCommand(counterStr)
+ EHZ_consumption_power.postUpdate(consumptionStr)
+end
diff --git a/sml/sml_server.c b/sml/sml_server.c
new file mode 100644
index 0000000..f2e15c9
--- /dev/null
+++ b/sml/sml_server.c
@@ -0,0 +1,135 @@
+// 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 .
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#include
+#include
+
+int serial_port_open(const char* device) {
+ int bits;
+ struct termios config;
+ memset(&config, 0, sizeof(config));
+
+ int fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
+ if (fd < 0) {
+ printf("error: open(%s): %s\n", device, strerror(errno));
+ return -1;
+ }
+
+ // set RTS
+ ioctl(fd, TIOCMGET, &bits);
+ bits |= TIOCM_RTS;
+ ioctl(fd, TIOCMSET, &bits);
+
+ tcgetattr( fd, &config ) ;
+
+ // set 8-N-1
+ 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);
+
+ 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;
+ double value;
+ sml_file *file = sml_file_parse(buffer + 8, buffer_len - 16);
+ // the sml file is parsed now
+ for (i = 0; i < file->messages_len; i++) {
+ sml_message *message = file->messages[i];
+ if (*message->message_body->tag == SML_MESSAGE_GET_LIST_RESPONSE) {
+ sml_list *entry;
+ sml_get_list_response *body;
+ body = (sml_get_list_response *) message->message_body->data;
+ for (entry = body->val_list; entry != NULL; entry = entry->next) {
+ switch (entry->value->type) {
+ case 0x51: value= *entry->value->data.int8; break;
+ case 0x52: value= *entry->value->data.int16; break;
+ case 0x54: value= *entry->value->data.int32; break;
+ case 0x58: value= *entry->value->data.int64; break;
+ case 0x61: value= *entry->value->data.uint8; break;
+ case 0x62: value= *entry->value->data.uint16; break;
+ case 0x64: value= *entry->value->data.uint32; break;
+ case 0x68: value= *entry->value->data.uint64; break;
+ default:
+ value = 0;
+ }
+ int scaler = (entry->scaler) ? *entry->scaler : 1;
+ if (scaler==-1)
+ value *= 0.0001;
+ if (value) {
+ printf("%d-%d:%d.%d.%d*%d#%.3f#\n",
+ entry->obj_name->str[0], entry->obj_name->str[1],
+ entry->obj_name->str[2], entry->obj_name->str[3],
+ entry->obj_name->str[4], entry->obj_name->str[5], value);
+ }
+ }
+ sml_file_free(file);
+ exit(0); // processed first message - exit
+ }
+ }
+}
+
+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 (fd > 0) {
+ // listen on the serial device, this call is blocking.
+ sml_transport_listen(fd, &transport_receiver);
+ close(fd);
+ }
+
+ return 0;
+}
+