esphome-docs/components/text_sensor/ble_client.rst

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BLE Client Text Sensor
======================
.. seo::
:description: Fetch string values from BLE devices.
:image: bluetooth.svg
The ``ble_client`` component is a text sensor platform that can
query BLE devices for specific values of service characteristics.
For more information on BLE services and characteristics, see
:doc:`/components/ble_client`.
.. code-block:: yaml
esp32_ble_tracker:
ble_client:
- mac_address: FF:FF:20:00:0F:15
id: itag_black
text_sensor:
- platform: ble_client
ble_client_id: itag_black
name: "Sensor Location"
service_uuid: '180d'
characteristic_uuid: '2a38'
Configuration variables:
------------------------
- **ble_client_id** (**Required**, :ref:`config-id`): ID of the associated BLE client.
- **service_uuid** (**Required**, UUID): UUID of the service on the device.
- **characteristic_uuid** (**Required**, UUID): UUID of the service's characteristic to query.
- **descriptor_uuid** (*Optional*, UUID): UUID of the characteristic's descriptor to query.
- **id** (*Optional*, :ref:`config-id`): The ID to use for code generation, and for reference by dependent components.
- **notify** (*Optional*, boolean): Instruct the server to send notifications for this
characteristic. Defaults to ``false``.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to poll the device. Defaults to ``60s``.
- All other options from :ref:`Text Sensor <config-text_sensor>`.
Automations:
- **on_notify** (*Optional*, :ref:`Automation <automation>`): An automation to
perform when a notify message is received from the device. See :ref:`ble_text_sensor-on_notify`.
BLE Sensor Automation
---------------------
.. _ble_text_sensor-on_notify:
``on_notify``
*************
This automation is triggered when the device/server sends a notify message for
a characteristic. The config variable *notify* must be true or this will have
no effect.
A variable ``x`` of type ``std::string`` is passed to the automation for use in lambdas.
See Also
--------
- :doc:`/components/ble_client`
- :doc:`/components/sensor/ble_client`
- :ref:`sensor-filters`
- :apiref:`ble_text_sensor/ble_text_sensor.h`
- :ghedit:`Edit`