2022-02-02 04:50:45 +08:00
|
|
|
.. _ota:
|
|
|
|
|
|
|
|
|
|
Over-the-Air Update
|
|
|
|
|
###################
|
|
|
|
|
|
|
|
|
|
Overview
|
|
|
|
|
********
|
|
|
|
|
|
|
|
|
|
Over-the-Air (OTA) Update is a method for delivering firmware updates to remote
|
|
|
|
|
devices using a network connection. Although the name implies a wireless
|
|
|
|
|
connection, updates received over a wired connection (such as Ethernet)
|
|
|
|
|
are still commonly referred to as OTA updates. This approach requires server
|
|
|
|
|
infrastructure to host the firmware binary and implement a method of signaling
|
|
|
|
|
when an update is available. Security is a concern with OTA updates; firmware
|
|
|
|
|
binaries should be cryptographically signed and verified before upgrading.
|
|
|
|
|
|
|
|
|
|
The :ref:`dfu` section discusses upgrading Zephyr firmware using MCUboot. The
|
|
|
|
|
same method can be used as part of OTA. The binary is first downloaded
|
|
|
|
|
into an unoccupied code partition, usually named ``slot1_partition``, then
|
|
|
|
|
upgraded using the :ref:`mcuboot` process.
|
|
|
|
|
|
|
|
|
|
Examples of OTA
|
|
|
|
|
***************
|
|
|
|
|
|
|
|
|
|
Golioth
|
|
|
|
|
=======
|
|
|
|
|
|
|
|
|
|
`Golioth`_ is an IoT management platform that includes OTA updates. Devices are
|
|
|
|
|
configured to observe your available firmware revisions on the Golioth Cloud.
|
|
|
|
|
When a new version is available, the device downloads and flashes the binary. In
|
|
|
|
|
this implementation, the connection between cloud and device is secured using
|
|
|
|
|
TLS/DTLS, and the signed firmware binary is confirmed by MCUboot before the
|
|
|
|
|
upgrade occurs.
|
|
|
|
|
|
|
|
|
|
1. A working sample can be found on the `Golioth Zephyr-SDK repository`_
|
|
|
|
|
2. The `Golioth OTA documentation`_ includes complete information about the
|
|
|
|
|
versioning process
|
|
|
|
|
|
|
|
|
|
Eclipse hawkBit |trade|
|
|
|
|
|
=======================
|
|
|
|
|
|
|
|
|
|
`Eclipse hawkBit`_ |trade| is an update server framework that uses polling on a
|
|
|
|
|
REST api to detect firmware updates. When a new update is detected, the binary
|
|
|
|
|
is downloaded and installed. MCUboot can be used to verify the signature before
|
|
|
|
|
upgrading the firmware.
|
|
|
|
|
|
|
|
|
|
There is a :ref:`hawkbit-api-sample` included in the
|
|
|
|
|
Zephyr :ref:`mgmt-samples` section.
|
|
|
|
|
|
|
|
|
|
UpdateHub
|
|
|
|
|
=========
|
|
|
|
|
|
|
|
|
|
`UpdateHub`_ is a platform for remotely updating embedded devices. Updates can
|
|
|
|
|
be manually triggered or monitored via polling. When a new update is detected,
|
|
|
|
|
the binary is downloaded and installed. MCUboot can be used to verify the
|
|
|
|
|
signature before upgrading the firmware.
|
|
|
|
|
|
|
|
|
|
There is an :ref:`updatehub_fota_sample` included in the Zephyr
|
|
|
|
|
:ref:`mgmt-samples` section.
|
|
|
|
|
|
|
|
|
|
SMP Server
|
|
|
|
|
==========
|
|
|
|
|
|
|
|
|
|
A Simple Management Protocol (SMP) server can be used to update firmware via
|
|
|
|
|
Bluetooth Low Energy (BLE) or UDP. :ref:`mcu_mgr` is used to send a signed
|
|
|
|
|
firmware binary to the remote device where it is verified by MCUboot before the
|
|
|
|
|
upgrade occurs.
|
|
|
|
|
|
|
|
|
|
There is an :ref:`smp_svr_sample` included in the Zephyr :ref:`mgmt-samples`
|
|
|
|
|
section.
|
|
|
|
|
|
|
|
|
|
Lightweight M2M (LWM2M)
|
|
|
|
|
=======================
|
|
|
|
|
|
|
|
|
|
The :ref:`lwm2m_interface` protocol includes support for firmware update via
|
2022-02-08 00:27:43 +08:00
|
|
|
:kconfig:option:`CONFIG_LWM2M_FIRMWARE_UPDATE_OBJ_SUPPORT`. Devices securely
|
|
|
|
|
connect to an LwM2M server using DTLS. An :ref:`lwm2m-client-sample` sample is
|
|
|
|
|
available but it does not demonstrate the firmware update feature.
|
2022-02-02 04:50:45 +08:00
|
|
|
|
|
|
|
|
.. _MCUboot bootloader: https://mcuboot.com/
|
|
|
|
|
.. _Golioth: https://golioth.io/
|
|
|
|
|
.. _Golioth Zephyr-SDK repository: https://github.com/golioth/zephyr-sdk/tree/main/samples/dfu
|
|
|
|
|
.. _Golioth OTA documentation: https://docs.golioth.io/cloud/services/ota
|
|
|
|
|
.. _Eclipse hawkBit: https://www.eclipse.org/hawkbit/
|
|
|
|
|
.. _UpdateHub: https://updatehub.io/
|
