esphome-docs/components/text_sensor/mqtt_subscribe.rst
2019-03-05 20:42:43 +01:00

58 lines
1.7 KiB
ReStructuredText

MQTT Subscribe Text Sensor
==========================
.. seo::
:description: Instructions for setting up MQTT Subscribe text sensors that show the content of a MQTT message as their state.
:image: mqtt.png
:keywords: MQTT
The ``mqtt_subscribe`` text sensor platform allows you to get external data into ESPHome.
The sensor will subscribe to messages on the given MQTT topic and save the most recent value
in its ``id(mysensor).state``.
.. code-block:: yaml
# Example configuration entry
text_sensor:
- platform: mqtt_subscribe
name: "Data from topic"
id: mysensor
topic: the/topic
Configuration variables:
------------------------
- **name** (**Required**, string): The name of the text sensor.
- **topic** (**Required**, string): The MQTT topic to listen for numeric messages.
- **qos** (*Optional*, int): The MQTT QoS to subscribe with. Defaults to ``0``.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
- All other options from :ref:`Text Sensor <config-text_sensor>`.
Example Usage for Displays
--------------------------
This integration is especially useful for displays, to show external data on the display.
Please note you have to use the ``.c_str()`` method on the ``.state`` object together with the ``%s`` format
to use it in ``printf`` expressions.
.. code-block:: yaml
# Example configuration entry
text_sensor:
- platform: mqtt_subscribe
name: "Data from topic"
id: mysensor
topic: the/topic
display:
- platform: ...
# ...
lambda: |-
it.printf(0, 0, id(font), "The data is: %s", id(mysensor).state.c_str());
See Also
--------
- :apiref:`text_sensor/mqtt_subscribe_text_sensor.h`
- :ghedit:`Edit`