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Remote agent on Pi Zero - Fails to start

Trying to run - pio remote agent start on a Pi Zero fails.

The following is part of the error.

It takes a very longtime to get to this point. Maybe a few hours.

Building wheel for cryptography (PEP 517) ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/bin/python3 /tmp/tmpfdf5veny_in_process.py build_wheel /tmp/tmpw4cld6du
       cwd: /tmp/pip-install-bfoky9x7/cryptography_ad3b2f62ff8641f3be82c24c95dd43c0
  Complete output (168 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-armv6l-3.9
  creating build/lib.linux-armv6l-3.9/cryptography

Running:

pip install cryptography

Works without failure so I think I have all the required dependiences.

Pio Remote errors with this message:

 running build_ext
  running build_rust
  
      =============================DEBUG ASSISTANCE=============================
      If you are seeing a compilation error please try the following steps to
      successfully install cryptography:
      1) Upgrade to the latest pip and try again. This will fix errors for most
         users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
      2) Read https://cryptography.io/en/latest/installation/ for specific
         instructions for your platform.
      3) Check our frequently asked questions for more information:
         https://cryptography.io/en/latest/faq/
      4) Ensure you have a recent Rust toolchain installed:
         https://cryptography.io/en/latest/installation/#rust
  
      Python: 3.9.2
      platform: Linux-5.10.63+-armv6l-with-glibc2.31
      pip: n/a
      setuptools: 59.2.0
      setuptools_rust: 0.12.1
      =============================DEBUG ASSISTANCE=============================
  
  error: can't find Rust compiler
  
  If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler.
  
  To update pip, run:
  
      pip install --upgrade pip
  
  and then retry package installation.
  
  If you did intend to build this package from source, try installing a Rust compiler from your system package manager and ensure it is on the PATH during installation. Alternatively, rustup (available at https://rustup.rs) is the recommended way to download and update the Rust compiler toolchain.
  
  This package requires Rust >=1.41.0.
  ----------------------------------------
  ERROR: Failed building wheel for cryptography
Successfully built pyopenssl
Failed to build cryptography

Any Ideas?

Thanks

Hmm I thought @ivankravets had pinned the cryptography version to be at the one that didn’t require the Rust compiler in HowTo: Raspberry Pi 3 as remote agent (Oct. 2020) - #17 by ivankravets. Can you do a pio upgrade --dev to make sure you have the latest version, then retry?

1 Like

Please upgrade to the latest PlatformIO Core.

Hi Ivan & Max

Thanks I though I had but will try now and report back