pio remote agent throw's exception on raspberry pi's (5.0.0)

I have a problem running the remote agent on raspberry Pi’s with the new 5.0.0:

Configuration

Operating system: Raspbian 10 on Raspberry Pi 4 and Raspbian 9 on Raspberry Pi Zero (tested on both, raspbian 10 is pretty clean, first time PlatformIO installation).

PlatformIO Version (platformio --version): PlatformIO, version 5.0.0

(penv) pi@troel3:~ $ pio system info

---

PlatformIO Core 5.0.0 Python 3.7.3-final.0 System Type linux_armv7l Platform Linux-5.4.51-v7l±armv7l-with-glibc2.28 File System Encoding utf-8 Locale Encoding UTF-8 PlatformIO Core Directory /home/pi/.platformio PlatformIO Core Executable /home/pi/.platformio/penv/bin/platformio Python Executable /home/pi/.platformio/penv/bin/python Global Libraries 0 Development Platforms 0 Tools & Toolchains 2

---

Description of problem

• pio remote agent start
• pio remote agent list both will throw an exeption (see below)

pio remote agent produces the general help text. Other pio commands seem to work ok.

Steps to Reproduce

1. Do a clean install of platform (wget https://raw.githubusercontent.com/platformio/platformio-core-installer/master/get-platformio.py -O get-platformio.py; python3 get-platformio.py)
2. Login with: pio account login (works ok)
3. start remote agent: pio agent remote start

Actual Results

(penv) pi@troel3:~ $ pio remote agent start [89/395] Tool Manager: Installing platformio/contrib-pysite @ ~2.37.0 Unpacking [####################################] 100% Tool Manager: contrib-pysite @ 2.37.191020 has been installed!
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting twisted==20.3.0
Using cached https://www.piwheels.org/simple/twisted/Twisted-20.3.0-cp37-cp37m-linux_armv7l.whl (3.1 MB)
Collecting constantly>=15.1 Using cached constantly-15.1.0-py2.py3-none-any.whl (7.9 kB) Collecting Automat>=0.3.0 Using cached Automat-20.2.0-py2.py3-none-any.whl (31 kB) Collecting PyHamcrest!=1.10.0,>=1.9.0 Using cached PyHamcrest-2.0.2-py3-none-any.whl (52 kB) Collecting hyperlink>=17.1.1 Using cached hyperlink-20.0.1-py2.py3-none-any.whl (48 kB) Collecting incremental>=16.10.1 Using cached incremental-17.5.0-py2.py3-none-any.whl (16 kB) Collecting attrs>=19.2.0 Using cached attrs-20.1.0-py2.py3-none-any.whl (49 kB) Collecting zope.interface>=4.4.2 Using cached https://www.piwheels.org/simple/zope-interface/zope.interface-5.1.0-cp37-cp37m-linux_armv7l.whl (223 kB) Collecting six Using cached six-1.15.0-py2.py3-none-any.whl (10 kB) Collecting idna>=2.5 Using cached idna-2.10-py2.py3-none-any.whl (58 kB) Collecting setuptools Using cached setuptools-50.2.0-py3-none-any.whl (784 kB) Installing collected packages: constantly, attrs, six, Automat, PyHamcrest, idna, hyperlink, incremental, setuptools, zope.interface, twisted Successfully installed Automat-20.2.0 PyHamcrest-2.0.2 attrs-20.1.0 constantly-15.1.0 hyperlink-20.0.1 idna-2.10 incremental-17.5.0 setuptools-50.2.0 six-1.15 .0 twisted-20.3.0 zope.interface-5.1.0 Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting autobahn==20.4.3 Using cached autobahn-20.4.3-py2.py3-none-any.whl (1.1 MB) Collecting cryptography>=2.7 Using cached https://www.piwheels.org/simple/cryptography/cryptography-3.1-cp37-cp37m-linux_armv7l.whl (765 kB) Collecting txaio>=20.3.1 Using cached txaio-20.4.1-py2.py3-none-any.whl (30 kB) Collecting six>=1.4.1 Using cached six-1.15.0-py2.py3-none-any.whl (10 kB) Processing ./.cache/pip/wheels/48/79/c0/d4efbf056e6e79a44346a80938784d462f6a346eea8a47a220/cffi-1.14.2-cp37-cp37m-linux_armv7l.whl Collecting pycparser Using cached pycparser-2.20-py2.py3-none-any.whl (112 kB) Installing collected packages: six, pycparser, cffi, cryptography, txaio, autobahn Successfully installed autobahn-20.4.3 cffi-1.14.2 cryptography-3.1 pycparser-2.20 six-1.15.0 txaio-20.4.1 WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/six.py already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/twisted already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/six-1.15.0.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/bin already exists. Specify --upgrade to force replacement. Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting json-rpc==1.13.0 Using cached json_rpc-1.13.0-py2.py3-none-any.whl (41 kB) Installing collected packages: json-rpc Successfully installed json-rpc-1.13.0 Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting pyopenssl>=16.0.0 Using cached pyOpenSSL-19.1.0-py2.py3-none-any.whl (53 kB) Collecting six>=1.5.2 Using cached six-1.15.0-py2.py3-none-any.whl (10 kB) Collecting cryptography>=2.8 Using cached https://www.piwheels.org/simple/cryptography/cryptography-3.1-cp37-cp37m-linux_armv7l.whl (765 kB) Processing ./.cache/pip/wheels/48/79/c0/d4efbf056e6e79a44346a80938784d462f6a346eea8a47a220/cffi-1.14.2-cp37-cp37m-linux_armv7l.whl Collecting pycparser Using cached pycparser-2.20-py2.py3-none-any.whl (112 kB) Installing collected packages: six, pycparser, cffi, cryptography, pyopenssl Successfully installed cffi-1.14.2 cryptography-3.1 pycparser-2.20 pyopenssl-19.1.0 six-1.15.0 WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/_cffi_backend.cpython-37m-arm-linux-gnueabihf.so already exists. Specify --upgrade to f orce replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/pycparser already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/pycparser-2.20.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/six.py already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cffi already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cffi-1.14.2.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cryptography already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cryptography-3.1.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/six-1.15.0.dist-info already exists. Specify --upgrade to force replacement. Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting service_identity>=18.1.0 Using cached service_identity-18.1.0-py2.py3-none-any.whl (11 kB) Collecting cryptography Using cached https://www.piwheels.org/simple/cryptography/cryptography-3.1-cp37-cp37m-linux_armv7l.whl (765 kB) Collecting pyasn1
Using cached pyasn1-0.4.8-py2.py3-none-any.whl (77 kB) Collecting attrs>=16.0.0
Using cached attrs-20.1.0-py2.py3-none-any.whl (49 kB) Collecting pyasn1-modules Using cached pyasn1_modules-0.2.8-py2.py3-none-any.whl (155 kB) Collecting six>=1.4.1 Using cached six-1.15.0-py2.py3-none-any.whl (10 kB) Processing ./.cache/pip/wheels/48/79/c0/d4efbf056e6e79a44346a80938784d462f6a346eea8a47a220/cffi-1.14.2-cp37-cp37m-linux_armv7l.whl Collecting pycparser Using cached pycparser-2.20-py2.py3-none-any.whl (112 kB) Installing collected packages: six, pycparser, cffi, cryptography, pyasn1, attrs, pyasn1-modules, service-identity Successfully installed attrs-20.1.0 cffi-1.14.2 cryptography-3.1 pyasn1-0.4.8 pyasn1-modules-0.2.8 pycparser-2.20 service-identity-18.1.0 six-1.15.0 WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/_cffi_backend.cpython-37m-arm-linux-gnueabihf.so already exists. Specify --upgrade to f orce replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/pycparser already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/attrs-20.1.0.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/pycparser-2.20.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/six.py already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cffi already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cffi-1.14.2.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cryptography already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/cryptography-3.1.dist-info already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/attr already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/six-1.15.0.dist-info already exists. Specify --upgrade to force replacement. Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting idna!=2.3,>=0.6 Using cached idna-2.10-py2.py3-none-any.whl (58 kB) Installing collected packages: idna Successfully installed idna-2.10 WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/idna already exists. Specify --upgrade to force replacement. WARNING: Target directory /home/pi/.platformio/packages/contrib-pysite/idna-2.10.dist-info already exists. Specify --upgrade to force replacement. Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting zeroconf==0.26.0 Using cached zeroconf-0.26.0-py3-none-any.whl (67 kB) Collecting ifaddr Using cached ifaddr-0.1.7-py2.py3-none-any.whl (10 kB) Installing collected packages: ifaddr, zeroconf Successfully installed ifaddr-0.1.7 zeroconf-0.26.0 Error: Traceback (most recent call last): File “/home/pi/.platformio/penv/lib/python3.7/site-packages/platformio/main.py”, line 109, in main cli() # pylint: disable=no-value-for-parameter File “/home/pi/.platformio/penv/lib/python3.7/site-packages/click/core.py”, line 829, in call return self.main(*args, **kwargs) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/click/core.py”, line 782, in main rv = self.invoke(ctx) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/platformio/commands/init.py”, line 44, in invoke return super(PlatformioCLI, self).invoke(ctx) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/click/core.py”, line 1259, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/click/core.py”, line 1259, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/click/core.py”, line 1259, in invoke return _process_result(sub_ctx.command.invoke(sub_ctx)) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/click/core.py”, line 1066, in invoke return ctx.invoke(self.callback, **ctx.params) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/click/core.py”, line 610, in invoke return callback(*args, **kwargs) File “/home/pi/.platformio/penv/lib/python3.7/site-packages/platformio/commands/remote/command.py”, line 66, in remote_agent_start from platformio.commands.remote.client.agent_service import RemoteAgentService File “/home/pi/.platformio/penv/lib/python3.7/site-packages/platformio/commands/remote/client/agent_service.py”, line 25, in <module> from platformio.commands.remote.client.base import RemoteClientBase File “/home/pi/.platformio/penv/lib/python3.7/site-packages/platformio/commands/remote/client/base.py”, line 30, in <module> from platformio.commands.remote.factory.ssl import SSLContextFactory File “/home/pi/.platformio/penv/lib/python3.7/site-packages/platformio/commands/remote/factory/ssl.py”, line 16, in <module> from OpenSSL import SSL # pylint: disable=import-error File “/home/pi/.platformio/packages/contrib-pysite/OpenSSL/init.py”, line 8, in <module> from OpenSSL import crypto, SSL File “/home/pi/.platformio/packages/contrib-pysite/OpenSSL/crypto.py”, line 12, in <module> from cryptography import x509 File “/home/pi/.platformio/packages/contrib-pysite/cryptography/x509/init.py”, line 8, in <module> from cryptography.x509.base import ( File “/home/pi/.platformio/packages/contrib-pysite/cryptography/x509/base.py”, line 15, in <module> from cryptography.hazmat.backends import _get_backend ImportError: cannot import name ‘_get_backend’ from ‘cryptography.hazmat.backends’ (/home/pi/.platformio/packages/contrib-pysite/cryptography/hazmat/backends/ init.py)

============================================================

An unexpected error occurred. Further steps:

• Verify that you have the latest version of PlatformIO using
  pip install -U platformio command

• Try to find answer in FAQ Troubleshooting section https://docs.platformio.org/page/faq.html

• Report this problem to the developers
  https://github.com/platformio/platformio-core/issues

============================================================

Expected Results

Not an exception but a running agent. 😃

Additional info

• Every time I run a pio remote … command the package installations shown above are executed. Normally I expect this to run only once after an installation/upgrade. I have no explanation why this happens, probably because of the exception?

• Tried several things including install additional libraries and or -dev packages or adding packages manually (pip install …). No difference at all.

• The method that throws the error is present in the .py file. Doesn’t look strange either, but I’m not very experienced with python.

• activating penv or not makes no difference.

Did I still miss something or is this a bug?

[ivankravets]

This is an issue with Cryptography pre-built binaries. I opened an issue https://github.com/pyca/cryptography/issues/5455

In any case, we did a workaround on our side. Could you performa the next commands?

1. pio upgrade --dev
2. pio home

It should recompile evrything from source. Does it work now?

[fietser28]

It also works on my Pi Zero with Raspbian 9. First time I ran ‘pio remote agent start’ it failed, second time it worked.

I also tried to remove the python3-cryptography packages (v1.7.1) and install cryptography thru pip (v3.1), but that didn’t work for me (I’m not very proficient in python/pip package management, although I learned a lot the last few days.)