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180 lines
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180 lines
6.8 KiB
ReStructuredText
SML (Smart Message Language)
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============================
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.. seo::
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:description: Instructions for setting up SML sensors
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:image: sml.svg
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:keywords: sml
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The ``SML`` component connects to smart meters which use the *Smart Message Language* (SML) protocol.
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Although the SML protocol is well defined, it gives a lot of freedom to the manufacturers how to store
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and identify the transmitted data. Within a telegram the physical values are identified by *OBIS* codes
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(Object Identification System). If it is known which code the manufacturer assigns to the physical value,
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the corresponding value can be extracted.
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Hardware
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--------
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This component is passive, it does not transmit any data to your equipment. Usually a smart meter transmit
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a telegram at regular intervals (2-4 seconds) on its own.
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This component decodes and updates the configured sensors at the pace the data is received.
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Most smart meters transmit the telegrams using an infrared optical interface. As a sensor a suitable photo
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transistor (e.g. BPW40) can be attached to the ESP's UART (emitter to `GND` and collector to `RX` pin). A more
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mature solution can be found `here
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<https://wiki.volkszaehler.org/hardware/controllers/ir-schreib-lesekopf-ttl-ausgang>`_ (in German).
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There are plenty of other examples and ready to buy solutions on the web.
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Configuration
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-------------
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As the communciation with the sensor is done using UART, you need to have the :ref:`UART bus <uart>`
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in your configuration. The interface parameters should be set to 9600/8N1 or 9600/7E1 depending on your
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smart meter. If you see checksum errors in the log try changing the interface parameter.
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.. code-block:: yaml
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# Example configuration entry
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uart:
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id: uart_bus
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rx_pin: GPIO3
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baud_rate: 9600
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data_bits: 8
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parity: NONE
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stop_bits: 1
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sml:
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id: mysml
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uart_id: uart_bus
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sensor:
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- platform: sml
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name: "Total energy"
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sml_id: mysml
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server_id: "0123456789abcdef"
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obis_code: "1-0:1.8.0"
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unit_of_measurement: kWh
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accuracy_decimals: 1
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device_class: energy
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state_class: total_increasing
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filters:
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- multiply: 0.0001
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text_sensor:
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- platform: sml
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name: "Manufacturer"
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sml_id: mysml
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server_id: "0123456789abcdef"
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obis_code: "129-129:199.130.3"
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format: text
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Configuration variables:
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------------------------
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.. _sml-platform:
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SML platform
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************
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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- **uart_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`UART Component <uart>` if you want
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to use multiple UART buses.
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Sensor
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******
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- **obis_code** (*Required*, string): Specify the OBIS code you want to retrieve data for from the device.
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The format must be (A-B:C.D.E, e.g. 1-0:1.8.0)
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- **server_id** (*Optional*, string): Specify the device's server_id to retrieve the OBIS code from. Should be specified if more then one device is connected to the same hardware sensor component.
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- **sml_id** (*Optional*, :ref:`config-id`): The ID of the :ref:`SML platform <sml-platform>`
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- All other options from :ref:`Sensor <config-sensor>`.
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Text Sensor
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***********
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- **obis_code** (*Required*, string): Specify the OBIS code you want to retrieve data for from the device.
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The format must be (A-B:C.D.E, e.g. 1-0:1.8.0)
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- **server_id** (*Optional*, string): Specify the device's server_id to retrieve the OBIS code from. Should be specified if more then one device is connected to the same hardware sensor component.
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- **sml_id** (*Optional*, :ref:`config-id`): The ID of the :ref:`SML platform <sml-platform>`
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- **format** (*Optional*, string): Override the automatic interpretation of the transmitted binary data value. Possible values (`int`, `uint`, `bool`, `hex`, `text`).
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- All other options from :ref:`Text Sensor <config-text_sensor>`.
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Getting OBIS codes and sensor ids
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---------------------------------
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The physical values in the transmitted SML telegram are identified by a *server id* and *OBIS codes*. The *server id*
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identifies your smart meter. If you have only one hardware component attached to your optical sensor you usually
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don't have to care about the server id and you may ommit it in your configuration.
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In order to get the server id and the available OBIS codes provided by your smart meter, simply set up the
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:ref:`SML platform <sml-platform>` and observe the log output (the :ref:`log level <logger-log_levels>`
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must be set to at least ``debug``!).
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Your log output will show something like this:
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.. figure:: images/sml-log.png
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:align: center
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:width: 100.0%
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OBIS information in the log of the `SML` component
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Each line represents a combination of the server id (in brackets), the OBIS code and the transmitted hex value
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(in square brackets).
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Precision errors
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----------------
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Many smart meters emit very huge numbers for certain OBIS codes (like the accumulated total active energy).
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This may lead to precision errors for the values reported by the sensor component to ESPHome. This shows in
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the fact that slightly wrong numbers may be reported to HomeAssistant. This is a result from internal limitations
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in ESPHome and has nothing to do with the SML component.
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If you cannot live with this, you can use the `TextSensor` with an appropriate format to transmit the value as
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a string to HomeAssistant. On the HomeAssistant side you can define a `Template Sensor <https://www.home-assistant.io/integrations/template/>`_
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to cast the value into the appropriate format and do some scaling.
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For ESPHome we have:
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.. code-block:: yaml
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# ESPHome configuration file
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text_sensor:
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- platform: sml
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name: "Total energy text"
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obis_code: "1-0:1.8.0"
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format: uint
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The `format` parameter is optional. If ommited, the SML component will try to guess the correct datatype
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from the received SML message.
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And in HomeAssistant:
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.. code-block:: yaml
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# Home Assistant configuration.yaml
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template:
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- sensor:
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- name: "Total Energy Consumption"
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unit_of_measurement: "kWh"
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state: >
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{% if states('sensor.total_energy_text') == 'unavailable' %}
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{{ states('sensor.total_energy_consumption') }}
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{% else %}
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{{ ((states('sensor.total_energy_text') | float) * 0.0001) | round(2) }}
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{% endif %}
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Usually the template sensor's value would turn to 0 if the ESP device is unavailable.
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This results in problems when using the sensor in combination with the `Utility Meter <https://www.home-assistant.io/integrations/utility_meter/>`_ integration.
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The state template provided above checks for the sensor's availability and keeps the
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current state in case of unavailability.
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See Also
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--------
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- :apiref:`sml/sml.h`
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- :ghedit:`Edit`
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