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The Memfault CLI tool is a simple command-line program which purpose is to make integrations with the Memfault cloud from other systems, like continuous integration servers, as easy as possible.

Under the hood, the tool acts as a client to Memfault's HTTP API.

The Memfault CLI tool is written in Python and published publicly in the Python Package Index (pypi).

Installing the Memfault CLI tool

To install it, make sure you have a recent version of Python 3.x installed.


Use a virtualenv to avoid conflicts with dependencies of other projects that use Python.

Then run pip3 install memfault-cli to install it.

Once installed, the memfault command should be available in your shell:

$ memfault --help

--email TEXT Account email to authenticate with
--password TEXT Account password or user API key to authenticate with
--project-key TEXT Memfault Project Key
--org-token TEXT Organization Auth Token
--org TEXT Organization slug
--project TEXT Project slug
--verbose Log verbosely
--version Show the version and exit.
--help Show this message and exit.

completion Generate shell completion script for memfault.
console Open a serial terminal and automatically post chunks to Memfault The command requires output produced by memfault_data_export_chunk.
deploy-release Publish a Release to a Cohort.
post-chunk Sends data generated by the memfault-firmware-sdk ("chunks") to the Memfault cloud.
upload-android-app-symbols Upload symbols & R8/ProGuard mapping for an Android app build.
upload-aosp-symbols Upload symbols for an Android OS/AOSP build.
upload-bugreport Upload an Android Bug Report for analysis by Memfault.
upload-coredump Upload an MCU coredump for analysis.
upload-custom-data-recording Upload a custom data recording (read: any file that might help you with debugging).
upload-elf-coredump Upload a Linux ELF coredump for analysis by Memfault.
upload-elf-symbols Upload symbols from a tarball of binaries
upload-mar Upload a Memfault Archive File (mar) file for analysis.
upload-mcu-symbols Upload symbols for an MCU build.
upload-ota-payload Upload a binary to be used for an OTA update.
upload-symbols [DEPRECATED] Upload symbols for an MCU or Android build.
upload-xed Upload an .xed or .xcd file for analysis.
upload-yocto-symbols Upload symbols for a Linux Yocto build.


There are four different ways to authenticate using the Memfault CLI.

  1. With an Organization Auth token
  2. With a user email and password
  3. With a user email and user API key
  4. With a Memfault Project key

Not all commands will work with every authentication method. Below shows which commands require which forms of authentication.

CommandOrganization TokenEmail + PasswordEmail + API keyProject Key

Using Organization Auth Token

To use an Organization auth token, pass --org-token with the contents of your Organization Auth token after the memfault command.

memfault --org-token ${ORGANIZATION_AUTH_TOKEN} ...

Using Email and Password or User API Key

To use email and password authentication, pass --email and --password after the memfault command.

memfault --email ${YOUR_EMAIL} --password ${USER_PASSWORD} ...


memfault --email ${YOUR_EMAIL} --password ${YOUR_USER_API_KEY} ...

Using Memfault Project Key

To use a Memfault Project key, pass --project-key after the memfault command.

memfault --project-key ${YOUR_PROJECT_KEY} ...

Example Usage: Uploading MCU Symbols


This operation requires an Organization Auth Token or User API Key.

For devices that are using Build IDs, uploading MCU symbols is done like so:

memfault \
--org acme-inc \
--project smart-sink \
upload-mcu-symbols \

If you are going to be working with the same project you can add standard arguments as environment variables to your shell init file or via the command line:

$ export MEMFAULT_ORG_TOKEN=<Organization Token>
$ export MEMFAULT_ORG=<Organization slug>
$ export MEMFAULT_PROJECT=<Project slug>

With these changes, the invocation reduces to:

memfault upload-mcu-symbols \
--hardware-version mp \
--software-type stm32-fw \
--software-version 1.0.0-alpha \

INFO: build/stm32-fw.elf: uploaded!
INFO: You can view in the UI here:
<Link to Symbols in UI>