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686 lines
25 KiB
ReStructuredText
686 lines
25 KiB
ReStructuredText
MQTT Client Component
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=====================
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.. seo::
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:description: Instructions for setting up the MQTT client to communicate with the local network in ESPHome.
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:image: mqtt.png
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:keywords: MQTT
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The MQTT Client Component sets up the MQTT connection to your broker.
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If you are connecting to Home Assistant, you may prefer to use the native API,
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in which case this is not needed.
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.. warning::
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If you enable MQTT and you do *not* use the "native API" for Home Assistant, you must
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remove the ``api:`` line from your ESPHome configuration, otherwise the ESP will
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reboot every 15 minutes because no client connected to the native API.
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.. code-block:: yaml
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# Example configuration entry
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mqtt:
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broker: 10.0.0.2
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username: livingroom
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password: !secret mqtt_password
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.. note::
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Support for esp-idf is still experminental. Please report issues you have with mqtt using the esp-idf framework.
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Configuration variables:
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------------------------
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- **broker** (**Required**, string): The host of your MQTT broker.
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- **port** (*Optional*, int): The port to connect to. Defaults to 1883.
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- **username** (*Optional*, string): The username to use for
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authentication. Empty (the default) means no authentication.
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- **password** (*Optional*, string): The password to use for
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authentication. Empty (the default) means no authentication.
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- **client_id** (*Optional*, string): The client id to use for opening
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connections. See :ref:`mqtt-defaults` for more information.
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- **discovery** (*Optional*, boolean): If Home Assistant automatic
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discovery should be enabled. Defaults to ``true``.
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- **discovery_retain** (*Optional*, boolean): Whether to retain MQTT
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discovery messages so that entities are added automatically on Home
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Assistant restart. Defaults to ``true``.
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- **discovery_prefix** (*Optional*, string): The prefix to use for Home
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Assistant’s MQTT discovery. Should not contain trailing slash.
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Defaults to ``homeassistant``.
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- **discovery_unique_id_generator** (*Optional*, string): The unique_id generator
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to use. Can be one of ``legacy`` or ``mac``. Defaults to ``legacy``, which
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generates unique_id in format ``ESP<component_type><default_object_id>``.
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``mac`` generator uses format ``<mac_address>-<component_type>-<fnv1_hash(friendly_name)>``.
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- **discovery_object_id_generator** (*Optional*, string): The object_id generator
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to use. Can be one of ``none`` or ``device_name``. Defaults to ``none`` which
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does not generate object_id. ``device_name`` generator uses format ``<device_name>_<friendly_name>``.
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- **use_abbreviations** (*Optional*, boolean): Whether to use
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`Abbreviations <https://www.home-assistant.io/docs/mqtt/discovery/>`__
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in discovery messages. Defaults to ``true``.
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- **topic_prefix** (*Optional*, string): The prefix used for all MQTT
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messages. Should not contain trailing slash. Defaults to ``<APP_NAME>``.
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Use ``null`` to disable publishing or subscribing of any MQTT topic unless
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it is explicitly configured.
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- **log_topic** (*Optional*, :ref:`mqtt-message`): The topic to send MQTT log
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messages to. Use ``null`` if you want to disable sending logs to MQTT.
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The ``log_topic`` has an additional configuration option:
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- **level** (*Optional*, string): The log level to use for MQTT logs. See
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:ref:`logger-log_levels` for options.
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- **birth_message** (*Optional*, :ref:`mqtt-message`): The message to send when
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a connection to the broker is established. See :ref:`mqtt-last_will_birth` for more information.
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- **will_message** (*Optional*, :ref:`mqtt-message`): The message to send when
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the MQTT connection is dropped. See :ref:`mqtt-last_will_birth` for more information.
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- **shutdown_message** (*Optional*, :ref:`mqtt-message`): The message to send when
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the node shuts down and the connection is closed cleanly. See :ref:`mqtt-last_will_birth` for more information.
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- **ssl_fingerprints** (*Optional*, list): Only on ESP8266. A list of SHA1 hashes used
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for verifying SSL connections. See :ref:`mqtt-ssl_fingerprints`.
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for more information.
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- **certificate_authority** (*Optional*, string): Only with ``esp-idf``. CA certificate in PEM format. See :ref:`mqtt-tls-idf` for more information
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- **client_certificate** (*Optional*, string): Only on ``esp32``. Client certificate in PEM format.
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- **client_certificate_key** (*Optional*, string): Only on ``esp32``. Client private key in PEM format.
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- **skip_cert_cn_check** (*Optional*, bool): Only with ``esp-idf``. Don't verify if the common name in the server certificate matches the value of ``broker``.
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- **idf_send_async** (*Optional*, bool): Only with ``esp-idf``. If true publishing the message happens from the internal mqtt task. The client only enqueues the message. Defaults to ``false``.
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The advantage of asyncronous publishing is that it doesn't block the esphome main thread. The disadvantage is a delay (up to 1-2 seconds) until the messages are actually sent out.
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Set this to true if you send large amounts of of data over mqtt.
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- **reboot_timeout** (*Optional*, :ref:`config-time`): The amount of time to wait before rebooting when no
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MQTT connection exists. Can be disabled by setting this to ``0s``. Defaults to ``15min``.
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- **keepalive** (*Optional*, :ref:`config-time`): The time
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to keep the MQTT socket alive, decreasing this can help with overall stability due to more
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WiFi traffic with more pings. Defaults to 15 seconds.
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- **on_connect** (*Optional*, :ref:`Automation <automation>`): An action to be performed when a connection
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to the broker is established.
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- **on_disconnect** (*Optional*, :ref:`Automation <automation>`): An action to be performed when the connection
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to the broker is dropped.
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- **on_message** (*Optional*, :ref:`Automation <automation>`): An action to be
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performed when a message on a specific MQTT topic is received. See :ref:`mqtt-on_message`.
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- **on_json_message** (*Optional*, :ref:`Automation <automation>`): An action to be
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performed when a JSON message on a specific MQTT topic is received. See :ref:`mqtt-on_json_message`.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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.. _mqtt-message:
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MQTTMessage
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-----------
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With the MQTT Message schema you can tell ESPHome how a specific MQTT message should be sent.
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It is used in several places like last will and birth messages or MQTT log options.
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.. code-block:: yaml
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# Simple:
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some_option: topic/to/send/to
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# Disable:
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some_option:
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# Advanced:
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some_option:
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topic: topic/to/send/to
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payload: online
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qos: 0
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retain: true
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Configuration options:
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- **topic** (**Required**, string): The MQTT topic to publish the message.
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- **payload** (**Required**, string): The message content. Will be filled by the actual payload with some
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options, like log_topic.
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- **qos** (*Optional*, int): The `Quality of
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Service <https://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels>`__
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level of the topic. Defaults to 0.
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- **retain** (*Optional*, boolean): If the published message should
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have a retain flag on or not. Defaults to ``true``.
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.. _mqtt-using_with_home_assistant:
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Using with Home Assistant
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-------------------------
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Using ESPHome with Home Assistant is easy, simply setup an MQTT
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broker (like `mosquitto <https://mosquitto.org/>`__) and point both your
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Home Assistant installation and ESPHome to that broker. Next, enable
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discovery in your Home Assistant configuration with the following:
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.. code-block:: yaml
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# Example Home Assistant configuration.yaml entry
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mqtt:
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broker: ...
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And that should already be it 🎉 All devices defined through ESPHome should show up automatically
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in the entities section of Home Assistant.
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When adding new entities, you might run into trouble with old entities
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still appearing in Home Assistant’s front-end. This is because in order
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to have Home Assistant “discover” your devices on restart, all discovery
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MQTT messages need to be retained. Therefore the old entities will also
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re-appear on every Home Assistant restart even though they’re in
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ESPHome anymore.
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To fix this, ESPHome has a simple helper script that purges stale
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retained messages for you:
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.. code-block:: bash
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esphome clean-mqtt configuration.yaml
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With Docker:
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.. code-block:: bash
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docker run --rm -v "${PWD}":/config -it ghcr.io/esphome/esphome clean-mqtt configuration.yaml
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This will remove all retained messages with the topic
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``<DISCOVERY_PREFIX>/+/NODE_NAME/#``. If you want to purge on another
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topic, simply add ``--topic <your_topic>`` to the command.
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Home Assistant generates entity names for all discovered devices based on entity type and
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entity name (e.g. ``sensor.uptime``). Numeric suffixes are appended to entity names when
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multiple devices use the same name for a sensor, making it harder to distinguish between
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similar sensors on different devices. Home Assistant 2021.12 allows MQTT devices to change
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this behaviour by specifying ``object_id`` discovery attribute which replaces the sensor
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name part of the generated entity name. Setting ``discovery_object_id_generator: device_name``
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in ESPHome MQTT integration configuration will cause Home Assistant to include device name
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in the generated entity names (e.g. ``sensor.uptime`` becomes ``sensor.<device name>_uptime``),
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making it easier to distinguish the entities in various entity lists.
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.. _mqtt-defaults:
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Defaults
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--------
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By default, ESPHome will prefix all messages with your node name or
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``topic_prefix`` if you have specified it manually. The client id will
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automatically be generated by using your node name and adding the MAC
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address of your device to it. Next, discovery is enabled by default with
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Home Assistant’s default prefix ``homeassistant``.
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If you want to prefix all MQTT messages with a different prefix, like
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``home/living_room``, you can specify a custom ``topic_prefix`` in the
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configuration. That way, you can use your existing wildcards like
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``home/+/#`` together with ESPHome. All other features of ESPHome
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(like availability) should still work correctly.
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.. _mqtt-last_will_birth:
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Last Will And Birth Messages
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----------------------------
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ESPHome uses the `last will
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testament <https://www.hivemq.com/blog/mqtt-essentials-part-9-last-will-and-testament>`__
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and birth message feature of MQTT to achieve availability reporting for
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Home Assistant. If the node is not connected to MQTT, Home Assistant
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will show all its entities as unavailable (a feature 😉).
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.. figure:: /components/images/mqtt-availability.png
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:align: center
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:width: 50.0%
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By default, ESPHome will send a retained MQTT message to
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``<TOPIC_PREFIX>/status`` with payload ``online``, and will tell the
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broker to send a message ``<TOPIC_PREFIX>/status`` with payload
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``offline`` if the connection drops.
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You can change these messages by overriding the ``birth_message`` and
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``will_message`` with the following options.
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.. code-block:: yaml
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mqtt:
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# ...
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birth_message:
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topic: myavailability/topic
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payload: online
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will_message:
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topic: myavailability/topic
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payload: offline
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- **birth_message** (*Optional*, :ref:`mqtt-message`)
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- **will_message** (*Optional*, :ref:`mqtt-message`)
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If the birth message and last will message have empty topics or topics
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that are different from each other, availability reporting will be
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disabled.
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.. _mqtt-ssl_fingerprints:
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SSL Fingerprints
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----------------
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On the ESP8266 you have the option to use SSL connections for MQTT. This feature
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will get expanded to the ESP32 once the base library, AsyncTCP, supports it. Please
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note that the SSL feature only checks the SHA1 hash of the SSL certificate to verify
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the integrity of the connection, so every time the certificate changes, you'll have to
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update the fingerprints variable. Additionally, SHA1 is known to be partially insecure
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and with some computing power the fingerprint can be faked.
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To get this fingerprint, first put the broker and port options in the configuration and
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then run the ``mqtt-fingerprint`` script of ESPHome to get the certificate:
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.. code-block:: bash
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esphome mqtt-fingerprint livingroom.yaml
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> SHA1 Fingerprint: a502ff13999f8b398ef1834f1123650b3236fc07
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> Copy above string into mqtt.ssl_fingerprints section of livingroom.yaml
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.. code-block:: yaml
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mqtt:
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# ...
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ssl_fingerprints:
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- a502ff13999f8b398ef1834f1123650b3236fc07
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.. _mqtt-tls-idf:
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TLS with esp-idf (esp32)
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------------------------
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If used with the esp-idf framework a TLS connection to a mqtt broker can be established.
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The servers CA certificate is required to validate the connection.
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You have to download the server CA certficiate in PEM format and add it to ``certificate_authority``.
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Usually these are .crt files and you can open them with any text editor.
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Also make sure to change the ``port`` of the mqtt broker. Most brokers use port 8883 for TLS connections.
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.. warning::
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MbedTLS, the library that handles TLS for the esp-idf, doesn't validate wildcard certificates.
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The Common Name check only works if the CN is explicitly reported in the certificate.
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- \*.example.com -> Fail
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- mqtt.example.com -> Success
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If a secure connection is necessary for your device, you really want to set:
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.. code-block:: yaml
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skip_cert_cn_check: false
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.. code-block:: yaml
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mqtt:
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broker: test.mymqtt.local
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port: 8883
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discovery_prefix: ${mqtt_prefix}/homeassistant
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log_topic: ${mqtt_prefix}/logs
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# Evaluate carefully skip_cert_cn_check
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skip_cert_cn_check: true
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idf_send_async: false
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certificate_authority: |
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-----BEGIN CERTIFICATE-----
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MIIEAzCCAuugAwIBAgIUBY1hlCGvdj4NhBXkZ/uLUZNILAwwDQYJKoZIhvcNAQEL
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BQAwgZAxCzAJBgNVBAYTAkdCMRcwFQYDVQQIDA5Vbml0ZWQgS2luZ2RvbTEOMAwG
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A1UEBwwFRGVyYnkxEjAQBgNVBAoMCU1vc3F1aXR0bzELMAkGA1UECwwCQ0ExFjAU
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BgNVBAMMDW1vc3F1aXR0by5vcmcxHzAdBgkqhkiG9w0BCQEWEHJvZ2VyQGF0Y2hv
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by5vcmcwHhcNMjAwNjA5MTEwNjM5WhcNMzAwNjA3MTEwNjM5WjCBkDELMAkGA1UE
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BhMCR0IxFzAVBgNVBAgMDlVuaXRlZCBLaW5nZG9tMQ4wDAYDVQQHDAVEZXJieTES
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MBAGA1UECgwJTW9zcXVpdHRvMQswCQYDVQQLDAJDQTEWMBQGA1UEAwwNbW9zcXVp
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dHRvLm9yZzEfMB0GCSqGSIb3DQEJARYQcm9nZXJAYXRjaG9vLm9yZzCCASIwDQYJ
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KoZIhvcNAQEBBQADggEPADCCAQoCggEBAME0HKmIzfTOwkKLT3THHe+ObdizamPg
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UZmD64Tf3zJdNeYGYn4CEXbyP6fy3tWc8S2boW6dzrH8SdFf9uo320GJA9B7U1FW
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Te3xda/Lm3JFfaHjkWw7jBwcauQZjpGINHapHRlpiCZsquAthOgxW9SgDgYlGzEA
|
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s06pkEFiMw+qDfLo/sxFKB6vQlFekMeCymjLCbNwPJyqyhFmPWwio/PDMruBTzPH
|
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3cioBnrJWKXc3OjXdLGFJOfj7pP0j/dr2LH72eSvv3PQQFl90CZPFhrCUcRHSSxo
|
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E6yjGOdnz7f6PveLIB574kQORwt8ePn0yidrTC1ictikED3nHYhMUOUCAwEAAaNT
|
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MFEwHQYDVR0OBBYEFPVV6xBUFPiGKDyo5V3+Hbh4N9YSMB8GA1UdIwQYMBaAFPVV
|
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6xBUFPiGKDyo5V3+Hbh4N9YSMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQEL
|
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BQADggEBAGa9kS21N70ThM6/Hj9D7mbVxKLBjVWe2TPsGfbl3rEDfZ+OKRZ2j6AC
|
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6r7jb4TZO3dzF2p6dgbrlU71Y/4K0TdzIjRj3cQ3KSm41JvUQ0hZ/c04iGDg/xWf
|
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+pp58nfPAYwuerruPNWmlStWAXf0UTqRtg4hQDWBuUFDJTuWuuBvEXudz74eh/wK
|
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sMwfu1HFvjy5Z0iMDU8PUDepjVolOCue9ashlS4EB5IECdSR2TItnAIiIwimx839
|
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LdUdRudafMu5T5Xma182OC0/u/xRlEm+tvKGGmfFcN0piqVl8OrSPBgIlb+1IKJE
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m/XriWr/Cq4h/JfB7NTsezVslgkBaoU=
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-----END CERTIFICATE-----
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.. _config-mqtt-component:
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MQTT Component Base Configuration
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---------------------------------
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All components in ESPHome that do some sort of communication through
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MQTT can have some overrides for specific options.
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.. code-block:: yaml
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name: "Component Name"
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# Optional variables:
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qos: 1
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retain: true
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availability:
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topic: livingroom/status
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payload_available: online
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payload_not_available: offline
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state_topic: livingroom/custom_state_topic
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command_topic: livingroom/custom_command_topic
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command_retain: false
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Configuration variables:
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- **name** (**Required**, string): The name to use for the MQTT
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Component.
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- **qos** (*Optional*, int): The [Quality of Service](https://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels/) level for publishing. Defaults to 0.
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- **retain** (*Optional*, boolean): If all MQTT state messages should
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be retained. Defaults to ``true``.
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- **discovery** (*Optional*, boolean): Manually enable/disable
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discovery for a component. Defaults to the global default.
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- **availability** (*Optional*): Manually set what should be sent to
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Home Assistant for showing entity availability. Default derived from
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:ref:`global birth/last will message <mqtt-last_will_birth>`.
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- **state_topic** (*Optional*, string): The topic to publish state
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updates to. Defaults to
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``<TOPIC_PREFIX>/<COMPONENT_TYPE>/<COMPONENT_NAME>/state``.
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ESPHome will always publish a manually configured state topic, even if
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the component is internal. Use ``null`` to disable publishing the
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component's state.
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- **command_topic** (*Optional*, string): The topic to subscribe to for
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commands from the remote. Defaults to
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``<TOPIC_PREFIX>/<COMPONENT_TYPE>/<COMPONENT_NAME>/command``.
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ESPHome will always subscribe to a manually configured command topic,
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even if the component is internal. Use ``null`` to disable subscribing
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to the component's command topic.
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- **command_retain** (*Optional*, boolean): Whether MQTT command messages
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sent to the device should be retained or not. Default to ``false``.
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.. warning::
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When changing these options and you're using MQTT discovery, you will need to restart Home Assistant.
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This is because Home Assistant only discovers a device once in every Home Assistant start.
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.. _mqtt-on_connect_disconnect:
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``on_connect`` / ``on_disconnect`` Trigger
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------------------------------------------
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This trigger is activated when a connection to the MQTT broker is established or dropped.
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.. code-block:: yaml
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mqtt:
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# ...
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on_connect:
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- switch.turn_on: switch1
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on_disconnect:
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- switch.turn_off: switch1
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.. _mqtt-on_message:
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``on_message`` Trigger
|
||
----------------------
|
||
|
||
With this configuration option you can write complex automations whenever an MQTT
|
||
message on a specific topic is received. To use the message content, use a :ref:`lambda <config-lambda>`
|
||
template, the message payload is available under the name ``x`` inside that lambda.
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
# ...
|
||
on_message:
|
||
topic: my/custom/topic
|
||
qos: 0
|
||
then:
|
||
- switch.turn_on: some_switch
|
||
|
||
Configuration variables:
|
||
|
||
- **topic** (**Required**, string): The MQTT topic to subscribe to and listen for MQTT
|
||
messages on. Every time a message with **this exact topic** is received, the automation will trigger.
|
||
|
||
- **qos** (*Optional*, int): The MQTT Quality of Service to subscribe to the topic with. Defaults
|
||
to 0.
|
||
|
||
- **payload** (*Optional*, string): Optionally set a payload to match. Only if exactly the payload
|
||
you specify with this option is received, the automation will be executed.
|
||
|
||
.. note::
|
||
|
||
You can even specify multiple ``on_message`` triggers by using a YAML list:
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
on_message:
|
||
- topic: some/topic
|
||
then:
|
||
- # ...
|
||
- topic: some/other/topic
|
||
then:
|
||
- # ...
|
||
|
||
.. note::
|
||
|
||
This action can also be used in :ref:`lambdas <config-lambda>`:
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
# Give the mqtt component an ID
|
||
id: mqtt_client
|
||
|
||
.. code-block:: cpp
|
||
|
||
id(mqtt_client).subscribe("the/topic", [=](const std::string &topic, const std::string &payload) {
|
||
// do something with payload
|
||
});
|
||
|
||
.. _mqtt-on_json_message:
|
||
|
||
``on_json_message`` Trigger
|
||
---------------------------
|
||
|
||
With this configuration option you can write complex automations whenever a JSON-encoded MQTT
|
||
message is received. To use the message content, use a :ref:`lambda <config-lambda>`
|
||
template, the decoded message payload is available under the name ``x`` inside that lambda.
|
||
|
||
The ``x`` object is of type ``JsonObject`` by the `ArduinoJson <https://github.com/bblanchon/ArduinoJson>`__
|
||
library, and you can use all of the methods of that library to access data.
|
||
|
||
Basically, you can access elements by typing ``x["THE_KEY"]`` and save them into local variables.
|
||
Please note that it's a good idea to check if the key exists in the Json Object by calling
|
||
``containsKey`` first as the ESP will crash if an element that does not exist is accessed.
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
# ...
|
||
on_json_message:
|
||
topic: the/topic
|
||
then:
|
||
- light.turn_on:
|
||
id: living_room_lights
|
||
|
||
transition_length: !lambda |-
|
||
int length = 1000;
|
||
if (x.containsKey("length"))
|
||
length = x["length"];
|
||
return length;
|
||
|
||
brightness: !lambda "return x["bright"];"
|
||
|
||
effect: !lambda |-
|
||
const char *effect = "None";
|
||
if (x.containsKey("effect"))
|
||
effect = x["effect"];
|
||
return effect;
|
||
|
||
Configuration variables:
|
||
|
||
- **topic** (**Required**, string): The MQTT topic to subscribe to and listen for MQTT
|
||
messages on. Every time a message with **this exact topic** is received, the automation will trigger.
|
||
|
||
- **qos** (*Optional*, int): The MQTT Quality of Service to subscribe to the topic with. Defaults
|
||
to 0.
|
||
|
||
.. note::
|
||
|
||
Due to the way this trigger works internally it is incompatible with certain actions and will
|
||
trigger a compile failure. For example with the ``delay`` action.
|
||
|
||
.. note::
|
||
|
||
This action can also be used in :ref:`lambdas <config-lambda>`:
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
# Give the mqtt component an ID
|
||
id: mqtt_client
|
||
|
||
.. code-block:: cpp
|
||
|
||
id(mqtt_client).subscribe_json("the/topic", [=](const std::string &topic, JsonObject root) {
|
||
// do something with JSON-decoded value root
|
||
});
|
||
|
||
.. _mqtt-publish_action:
|
||
|
||
``mqtt.publish`` Action
|
||
-----------------------
|
||
|
||
Publish an MQTT message on a topic using this action in automations.
|
||
|
||
.. code-block:: yaml
|
||
|
||
on_...:
|
||
then:
|
||
- mqtt.publish:
|
||
topic: some/topic
|
||
payload: "Something happened!"
|
||
|
||
# Templated:
|
||
- mqtt.publish:
|
||
topic: !lambda |-
|
||
if (id(reed_switch).state) return "topic1";
|
||
else return "topic2";
|
||
payload: !lambda |-
|
||
return id(reed_switch).state ? "YES" : "NO";
|
||
|
||
Configuration options:
|
||
|
||
- **topic** (**Required**, string, :ref:`templatable <config-templatable>`):
|
||
The MQTT topic to publish the message.
|
||
- **payload** (**Required**, string, :ref:`templatable <config-templatable>`): The message content.
|
||
- **qos** (*Optional*, int, :ref:`templatable <config-templatable>`): The `Quality of
|
||
Service <https://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels>`__
|
||
level of the topic. Defaults to 0.
|
||
- **retain** (*Optional*, boolean, :ref:`templatable <config-templatable>`): If the published message should
|
||
have a retain flag on or not. Defaults to ``false``.
|
||
|
||
|
||
.. note::
|
||
|
||
This action can also be written in :ref:`lambdas <config-lambda>`:
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
# Give the mqtt component an ID
|
||
id: mqtt_client
|
||
|
||
.. code-block:: cpp
|
||
|
||
id(mqtt_client).publish("the/topic", "The Payload");
|
||
|
||
.. _mqtt-publish_json_action:
|
||
|
||
``mqtt.publish_json`` Action
|
||
----------------------------
|
||
|
||
Publish a JSON-formatted MQTT message on a topic using this action in automations.
|
||
|
||
The JSON message will be constructed using the `ArduinoJson <https://github.com/bblanchon/ArduinoJson>`__ library.
|
||
In the ``payload`` option you have access to a ``root`` object which will represents the base object
|
||
of the JSON message. You can assign values to keys by using the ``root["KEY_NAME"] = VALUE;`` syntax
|
||
as seen below.
|
||
|
||
.. code-block:: yaml
|
||
|
||
on_...:
|
||
then:
|
||
- mqtt.publish_json:
|
||
topic: the/topic
|
||
payload: |-
|
||
root["key"] = id(my_sensor).state;
|
||
root["greeting"] = "Hello World";
|
||
|
||
# Will produce:
|
||
# {"key": 42.0, "greeting": "Hello World"}
|
||
|
||
Configuration options:
|
||
|
||
- **topic** (**Required**, string, :ref:`templatable <config-templatable>`):
|
||
The MQTT topic to publish the message.
|
||
- **payload** (**Required**, :ref:`lambda <config-lambda>`): The message content.
|
||
- **qos** (*Optional*, int): The `Quality of
|
||
Service <https://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels>`__
|
||
level of the topic. Defaults to 0.
|
||
- **retain** (*Optional*, boolean): If the published message should
|
||
have a retain flag on or not. Defaults to ``false``.
|
||
|
||
|
||
.. note::
|
||
|
||
This action can also be written in :ref:`lambdas <config-lambda>`:
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
# Give the mqtt component an ID
|
||
id: mqtt_client
|
||
|
||
.. code-block:: cpp
|
||
|
||
id(mqtt_client).publish_json("the/topic", [=](JsonObject root) {
|
||
root["something"] = id(my_sensor).state;
|
||
});
|
||
|
||
.. _mqtt-connected_condition:
|
||
|
||
``mqtt.connected`` Condition
|
||
----------------------------
|
||
|
||
This :ref:`Condition <config-condition>` checks if the MQTT client is currently connected to
|
||
the MQTT broker.
|
||
|
||
.. code-block:: yaml
|
||
|
||
on_...:
|
||
if:
|
||
condition:
|
||
mqtt.connected:
|
||
then:
|
||
- logger.log: MQTT is connected!
|
||
|
||
.. note::
|
||
|
||
This action can also be written in :ref:`lambdas <config-lambda>`:
|
||
|
||
.. code-block:: yaml
|
||
|
||
mqtt:
|
||
# Give the mqtt component an ID
|
||
id: mqtt_client
|
||
|
||
.. code-block:: cpp
|
||
|
||
if (id(mqtt_client)->is_connected()) {
|
||
// do something if MQTT is connected
|
||
}
|
||
|
||
See Also
|
||
--------
|
||
|
||
- :apiref:`mqtt/mqtt_client.h`
|
||
- :ghedit:`Edit`
|