esphome-docs/components/ota.rst

OTA Update Component
====================

.. seo::
    :description: Instructions for setting up Over-The-Air (OTA) updates for ESPs to upload firmwares remotely.
    :image: system-update.png
    :keywords: Xiaomi, Mi Flora, BLE, Bluetooth

With the OTA (Over The Air) update component you can upload your
firmware binaries to your node without having to use an USB cable for
uploads. ESPHome natively supports this through its ``run`` and
``upload`` helper scripts.

ESPHome also has an "OTA safe mode". If for some reason your
node gets into a boot loop, ESPHome will automatically try to detect
this and will go over into a safe mode after 10 unsuccessful boot
attempts. In that mode, all components are disabled and only Serial
Logging+WiFi+OTA are initialized, so that you can upload a new binary.

.. code-block:: yaml

    # Example configuration entry
    ota:
      safe_mode: True
      password: VERYSECURE

Configuration variables:
------------------------

-  **safe_mode** (*Optional*, boolean): Whether to enable safe mode.
   Defaults to ``True``.
-  **password** (*Optional*, string): The password to use for updates.
-  **port** (*Optional*, int): The port to use for OTA updates. Defaults
   to ``3232`` for the ESP32 and ``8266`` for the ESP8266.
-  **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.

.. note::

    Please be aware that ESP8266 modules must be reset after a serial
    upload before OTA can work.
    When you are trying to conduct an OTA update and receive an error message
    ``Bad Answer: ERR: ERROR[11]: Invalid bootstrapping`` the reason is
    very likely that power-cycling the ESP module is required once after
    the serial upload.

Updating the password:
----------------------

Since the password is used both for compiling and uploading the regular ``esphome <file> run``
won't work of course. This issue can be worked around by executing the operations separately
through an ``on_boot`` trigger:

.. code-block:: yaml

    esphome:
      on_boot:
        - lambda: |-
            id(ota).set_auth_password("New password");
    ota:
      password: "Old password"
      id: ota

See Also
--------

- :apiref:`ota/ota_component.h`
- :ghedit:`Edit`