added sml
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sml/README.md
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sml/README.md
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# Power Meter with SML
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Read data from a power meter (eHZ) using Smart Message Language (SML).
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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.
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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).
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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.
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* **sml.items**: Put this file into your */etc/openhab2/items*.
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* **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*.
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* **sml_server.c**: Put this file into the *libsml* subdirectory *src/libsml/examples* directory and compile *libsml*.
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2
sml/sml.items
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sml/sml.items
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Number EHZ_consumption_power "power consumption [%.1f kwh]"
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Number EHZ_status_power "power status [%.1f kwh]"
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14
sml/sml.rules
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sml/sml.rules
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rule "EHZ"
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when
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Time cron "0,30 */1 * * * ?" // this one cycles every 30 seconds. depends on your needs
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then
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// getting the payload of the meter
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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
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// splitting the payload - first in lines, then getting counterStr and consumptionStr with delimiter "#"
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val lines = meter_payload.split('\n')
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val counterStr = lines.get(0).split('#').get(1)
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val consumptionStr = lines.get(2).split('#').get(1)
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// Updating the items
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if (EHZ_status_power.state != counterStr) EHZ_status_power.sendCommand(counterStr)
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EHZ_consumption_power.postUpdate(consumptionStr)
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end
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135
sml/sml_server.c
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sml/sml_server.c
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// Copyright 2011 Juri Glass, Mathias Runge, Nadim El Sayed
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// DAI-Labor, TU-Berlin
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//
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// This file is part of libSML.
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//
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// libSML is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// libSML is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with libSML. If not, see <http://www.gnu.org/licenses/>.
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <termios.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sml/sml_file.h>
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#include <sml/sml_transport.h>
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int serial_port_open(const char* device) {
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int bits;
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struct termios config;
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memset(&config, 0, sizeof(config));
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int fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
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if (fd < 0) {
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printf("error: open(%s): %s\n", device, strerror(errno));
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return -1;
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}
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// set RTS
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ioctl(fd, TIOCMGET, &bits);
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bits |= TIOCM_RTS;
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ioctl(fd, TIOCMSET, &bits);
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tcgetattr( fd, &config ) ;
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// set 8-N-1
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config.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
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config.c_oflag &= ~OPOST;
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config.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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config.c_cflag &= ~(CSIZE | PARENB | PARODD | CSTOPB);
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config.c_cflag |= CS8;
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// set speed to 9600 baud
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cfsetispeed( &config, B9600);
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cfsetospeed( &config, B9600);
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tcsetattr(fd, TCSANOW, &config);
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return fd;
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}
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//void transport_receiver(unsigned char *buffer, size_t buffer_len) {
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// // the buffer contains the whole message, with transport escape sequences.
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// // these escape sequences are stripped here.
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// sml_file *file = sml_file_parse(buffer + 8, buffer_len - 16);
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// // the sml file is parsed now
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// // read here some values ..
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// // this prints some information about the file
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// sml_file_print(file);
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// // free the malloc'd memory
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// sml_file_free(file);
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//}
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void transport_receiver(unsigned char *buffer, size_t buffer_len) {
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// Danke an Axel (tuxedo) für seinen Beispielcode
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int i;
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double value;
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sml_file *file = sml_file_parse(buffer + 8, buffer_len - 16);
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// the sml file is parsed now
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for (i = 0; i < file->messages_len; i++) {
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sml_message *message = file->messages[i];
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if (*message->message_body->tag == SML_MESSAGE_GET_LIST_RESPONSE) {
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sml_list *entry;
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sml_get_list_response *body;
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body = (sml_get_list_response *) message->message_body->data;
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for (entry = body->val_list; entry != NULL; entry = entry->next) {
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switch (entry->value->type) {
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case 0x51: value= *entry->value->data.int8; break;
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case 0x52: value= *entry->value->data.int16; break;
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case 0x54: value= *entry->value->data.int32; break;
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case 0x58: value= *entry->value->data.int64; break;
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case 0x61: value= *entry->value->data.uint8; break;
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case 0x62: value= *entry->value->data.uint16; break;
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case 0x64: value= *entry->value->data.uint32; break;
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case 0x68: value= *entry->value->data.uint64; break;
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default:
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value = 0;
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}
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int scaler = (entry->scaler) ? *entry->scaler : 1;
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if (scaler==-1)
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value *= 0.0001;
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if (value) {
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printf("%d-%d:%d.%d.%d*%d#%.3f#\n",
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entry->obj_name->str[0], entry->obj_name->str[1],
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entry->obj_name->str[2], entry->obj_name->str[3],
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entry->obj_name->str[4], entry->obj_name->str[5], value);
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}
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}
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sml_file_free(file);
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exit(0); // processed first message - exit
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}
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}
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}
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int main(int argc, char **argv) {
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// this example assumes that a EDL21 meter sending SML messages via a
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// serial device. Adjust as needed.
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// char *device = "/dev/cu.usbserial";
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char *device=argv[1];
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int fd = serial_port_open(device);
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if (fd > 0) {
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// listen on the serial device, this call is blocking.
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sml_transport_listen(fd, &transport_receiver);
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close(fd);
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}
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return 0;
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}
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