Received package in Flask-Socketio but get AttributeError then.

[ghost]

Hello!
I'm currently upgrading a webserver to use WebSocket, as I need to stream data from an electronic board to a computer (to display them in real time as they arrive).

On the Client side (computer), I use python-socketio, and flask-socketio on the Server side (the board).
When I start the Server, I get a good message telling me that it was initialized for eventlet (which is what I want), then listen to the right IP (wsgi starting up on [IP]).

Then, when I launch the Client program, it seems to send the first information as they are displayed then on the Server thanks to the debug mode (I see the event name and the data attached to it): Received packet MESSAGE data 2["WebSocket_On",{"mode":"4"}]. But here the problem appears: I get the following error: 'Server' object has no attribute 'get_environ'. This comes in an Exception in thread Thread-[number].

I am completely stuck with that error, so if you can help me or giving me some clues, that would be awesome :-)

Here the pieces of codes:
Client:

import socketio

mode = 4
sio = socketio.Client()

@sio.on('raw_data')
def grab_raw_data(data):
      rospy.loginfo(data['msg'])
  
sio.connect(url_, transports=['websocket'])
sio.emit('WebSocket_On', {'mode': str(mode)})
sio.wait()

Server:

from flask_socketio import SocketIO
import eventlet
eventlet.patcher.monkey_patch(select=True, socket=True)

@socketio.on('WebSocket_On')
def grab_raw_data(test):
      count = 0
      str_resp = 'mode: ' + test['mode']
      print(str_resp)

      while count < 100:
          socketio.emit('raw_data', {'msg': str_resp})
          socketio.sleep(0)
          count += 1

if __name__ == '__main__':
      print('Running server\n')
socketio.run(app, host='192.168.0.11', port=5000, debug=True)

[miguelgrinberg]

Please include the complete output of the server, including the error, the stack trace and any information that appears before those. Also include the output of pip freeze in the client and in the server.

[ghost]

Complementary information: on the board I didn't install any greenlet/gevent, but only eventlet, to prevent any potential conflict between them.

[ghost]

Please see below the info you asked for:
Output log (server):

pip freeze (client):

actionlib==1.12.1
aiohttp @ file:///tmp/build/80754af9/aiohttp_1646806365504/work
aiosignal @ file:///tmp/build/80754af9/aiosignal_1637843061372/work
alabaster @ file:///home/ktietz/src/ci/alabaster_1611921544520/work
anaconda-client==1.11.0
anaconda-navigator==2.3.2
anaconda-project @ file:///opt/conda/conda-bld/anaconda-project_1660339890420/work
angles==1.9.12
anyio @ file:///tmp/build/80754af9/anyio_1644463572971/work/dist
appdirs==1.4.4
argon2-cffi @ file:///opt/conda/conda-bld/argon2-cffi_1645000214183/work
argon2-cffi-bindings @ file:///tmp/build/80754af9/argon2-cffi-bindings_1644569679365/work
arrow @ file:///croot/arrow_1666726871806/work
astroid @ file:///tmp/abs_e5wkt48jiz/croots/recipe/astroid_1659023120113/work
astropy @ file:///opt/conda/conda-bld/astropy_1657786094003/work
asttokens @ file:///opt/conda/conda-bld/asttokens_1646925590279/work
async-timeout @ file:///opt/conda/conda-bld/async-timeout_1664876359750/work
asyncio==3.4.3
atomicwrites==1.4.0
attrs @ file:///croot/attrs_1668696182826/work
Automat @ file:///tmp/build/80754af9/automat_1600298431173/work
autopep8 @ file:///opt/conda/conda-bld/autopep8_1650463822033/work
Babel @ file:///tmp/build/80754af9/babel_1620871417480/work
backcall @ file:///home/ktietz/src/ci/backcall_1611930011877/work
backports.functools-lru-cache @ file:///tmp/build/80754af9/backports.functools_lru_cache_1618170165463/work
backports.tempfile @ file:///home/linux1/recipes/ci/backports.tempfile_1610991236607/work
backports.weakref==1.0.post1
bcrypt @ file:///tmp/abs_6fpe92qzzo/croots/recipe/bcrypt_1659554336150/work
beautifulsoup4 @ file:///opt/conda/conda-bld/beautifulsoup4_1650462163268/work
bidict @ file:///tmp/build/80754af9/bidict_1607541094382/work
binaryornot @ file:///tmp/build/80754af9/binaryornot_1617751525010/work
bitarray @ file:///opt/conda/conda-bld/bitarray_1657739645104/work
bkcharts==0.2
black @ file:///opt/conda/conda-bld/black_1660237809219/work
bleach @ file:///opt/conda/conda-bld/bleach_1641577558959/work
bokeh @ file:///tmp/abs_34854e1f-d7d3-4f22-85d9-1075588e4ecdga64o0qg/croots/recipe/bokeh_1658136654619/work
bondpy==1.8.5
boto3 @ file:///tmp/abs_ae3c72db-af47-4298-baea-7270430e2c96scbpg1_h/croots/recipe/boto3_1657820109150/work
botocore @ file:///croot/botocore_1667494008919/work
Bottleneck @ file:///opt/conda/conda-bld/bottleneck_1657175564434/work
bqplot==0.12.36
brotlipy==0.7.0
cachetools @ file:///tmp/build/80754af9/cachetools_1619597386817/work
camera_calibration==1.15.2
camera_calibration_parsers==1.11.13
catkin==0.7.29
catkin-pkg==0.5.2
certifi @ file:///croot/certifi_1665076670883/work/certifi
cffi @ file:///tmp/abs_98z5h56wf8/croots/recipe/cffi_1659598650955/work
chardet @ file:///tmp/build/80754af9/chardet_1607706775000/work
charset-normalizer @ file:///tmp/build/80754af9/charset-normalizer_1630003229654/work
click @ file:///tmp/build/80754af9/click_1646056590078/work
cloudpickle @ file:///tmp/build/80754af9/cloudpickle_1632508026186/work
clyent==1.2.2
colorama @ file:///opt/conda/conda-bld/colorama_1657009087971/work
colorcet @ file:///croot/colorcet_1668084511401/work
conda==22.9.0
conda-build==3.22.0
conda-content-trust @ file:///tmp/abs_5952f1c8-355c-4855-ad2e-538535021ba5h26t22e5/croots/recipe/conda-content-trust_1658126371814/work
conda-pack @ file:///tmp/build/80754af9/conda-pack_1611163042455/work
conda-package-handling @ file:///croot/conda-package-handling_1666940373510/work
conda-repo-cli==1.0.24
conda-token @ file:///Users/paulyim/miniconda3/envs/c3i/conda-bld/conda-token_1662660369760/work
conda-verify==3.4.2
constantly==15.1.0
controller_manager==0.18.4
controller_manager_msgs==0.18.4
cookiecutter @ file:///opt/conda/conda-bld/cookiecutter_1649151442564/work
cryptography @ file:///croot/cryptography_1665612644927/work
cssselect==1.1.0
cv_bridge==1.13.1
cycler @ file:///tmp/build/80754af9/cycler_1637851556182/work
Cython @ file:///opt/conda/conda-bld/cython_1663692770955/work
cytoolz @ file:///croot/cytoolz_1667465931118/work
daal4py==2021.6.0
dask @ file:///tmp/abs_994957d9-ec12-411f-b953-c010f9d489d10hj3gz4k/croots/recipe/dask-core_1658513209934/work
datashader @ file:///croot/datashader_1668506374081/work
datashape==0.5.4
debugpy @ file:///tmp/build/80754af9/debugpy_1637091799509/work
decorator @ file:///opt/conda/conda-bld/decorator_1643638310831/work
defusedxml @ file:///tmp/build/80754af9/defusedxml_1615228127516/work
diagnostic_analysis==1.9.7
diagnostic_common_diagnostics==1.9.7
diagnostic_updater==1.9.7
diff-match-patch @ file:///Users/ktietz/demo/mc3/conda-bld/diff-match-patch_1630511840874/work
dill @ file:///croot/dill_1667919592856/work
distributed @ file:///tmp/abs_593da390-bd12-4acc-ba49-4c9993cbe8abgqg_w3rb/croots/recipe/distributed_1658520746481/work
distro==1.7.0
docutils @ file:///opt/conda/conda-bld/docutils_1657175430858/work
dynamic_reconfigure==1.6.5
entrypoints @ file:///tmp/build/80754af9/entrypoints_1649926439650/work
et-xmlfile==1.1.0
executing @ file:///opt/conda/conda-bld/executing_1646925071911/work
fastjsonschema @ file:///opt/conda/conda-bld/python-fastjsonschema_1661371079312/work
filelock @ file:///opt/conda/conda-bld/filelock_1647002191454/work
flake8 @ file:///opt/conda/conda-bld/flake8_1648129545443/work
Flask @ file:///home/ktietz/src/ci/flask_1611932660458/work
fonttools==4.25.0
frozenlist @ file:///tmp/build/80754af9/frozenlist_1637767113340/work
fsspec @ file:///croot/fsspec_1667496998820/work
future @ file:///tmp/build/80754af9/future_1607571303524/work
gazebo_plugins==2.8.7
gazebo_ros==2.8.7
gencpp==0.6.6
geneus==2.2.6
genlisp==0.4.16
genmsg==0.5.17
gennodejs==2.0.1
genpy==0.6.16
gensim @ file:///tmp/build/80754af9/gensim_1646806807927/work
glob2 @ file:///home/linux1/recipes/ci/glob2_1610991677669/work
gmpy2 @ file:///tmp/build/80754af9/gmpy2_1645438755360/work
google-api-core @ file:///opt/conda/conda-bld/google-api-core_1663638620529/work
google-auth @ file:///opt/conda/conda-bld/google-auth_1646735974934/work
google-cloud-core @ file:///croot/google-cloud-core_1666887720149/work
google-cloud-storage @ file:///croot/google-cloud-storage_1668473937338/work
google-crc32c @ file:///croot/google-crc32c_1667946620152/work
google-resumable-media @ file:///croot/google-resumable-media_1668208190857/work
googleapis-common-protos @ file:///opt/conda/conda-bld/googleapis-common-protos-feedstock_1660256159732/work
greenlet @ file:///tmp/build/80754af9/greenlet_1628888132713/work
grpcio @ file:///tmp/build/80754af9/grpcio_1637590821884/work
h5py @ file:///tmp/abs_4aewd3wzey/croots/recipe/h5py_1659091371897/work
HeapDict @ file:///Users/ktietz/demo/mc3/conda-bld/heapdict_1630598515714/work
holoviews @ file:///croot/holoviews_1668506894483/work
hvplot @ file:///croot/hvplot_1668767118610/work
hyperlink @ file:///tmp/build/80754af9/hyperlink_1610130746837/work
idna @ file:///croot/idna_1666125576474/work
image_geometry==1.13.1
imagecodecs @ file:///opt/conda/conda-bld/imagecodecs_1664561985385/work
imageio @ file:///tmp/abs_cd920173-f360-47c5-97b0-bf4d1076d5d4dvic0oys/croots/recipe/imageio_1658785036907/work
imagesize @ file:///opt/conda/conda-bld/imagesize_1657179498843/work
importlib-metadata @ file:///tmp/build/80754af9/importlib-metadata_1648544546694/work
incremental @ file:///tmp/build/80754af9/incremental_1636629750599/work
inflection==0.5.1
iniconfig @ file:///home/linux1/recipes/ci/iniconfig_1610983019677/work
intake @ file:///croot/intake_1668767432896/work
interactive-markers==1.11.5
intervaltree @ file:///Users/ktietz/demo/mc3/conda-bld/intervaltree_1630511889664/work
ipycanvas==0.13.1
ipykernel @ file:///opt/conda/conda-bld/ipykernel_1662361798230/work
ipython @ file:///tmp/abs_94gruux8u8/croots/recipe/ipython_1659529858706/work
ipython-genutils @ file:///tmp/build/80754af9/ipython_genutils_1606773439826/work
ipywidgets==7.7.2
isort @ file:///tmp/build/80754af9/isort_1628603791788/work
itemadapter @ file:///tmp/build/80754af9/itemadapter_1626442940632/work
itemloaders @ file:///opt/conda/conda-bld/itemloaders_1646805235997/work
itsdangerous @ file:///tmp/build/80754af9/itsdangerous_1621432558163/work
jdcal @ file:///Users/ktietz/demo/mc3/conda-bld/jdcal_1630584345063/work
jedi @ file:///tmp/build/80754af9/jedi_1644297102865/work
jeepney @ file:///tmp/build/80754af9/jeepney_1627537048313/work
jellyfish @ file:///tmp/build/80754af9/jellyfish_1647944426575/work
Jinja2 @ file:///tmp/build/80754af9/jinja2_1612213139570/work
jinja2-time @ file:///opt/conda/conda-bld/jinja2-time_1649251842261/work
jmespath @ file:///Users/ktietz/demo/mc3/conda-bld/jmespath_1630583964805/work
joblib @ file:///croot/joblib_1666298844297/work
joint_state_publisher==1.12.15
json5 @ file:///tmp/build/80754af9/json5_1624432770122/work
jsonschema @ file:///opt/conda/conda-bld/jsonschema_1663375472438/work
jupyros==0.6.1
jupyter @ file:///tmp/abs_33h4eoipez/croots/recipe/jupyter_1659349046347/work
jupyter-console @ file:///opt/conda/conda-bld/jupyter_console_1647002188872/work
jupyter-server @ file:///tmp/abs_b88b31b8-83b9-476d-a46d-e563c421f38fvsnyi1ur/croots/recipe/jupyter_server_1658754481507/work
jupyter_client @ file:///opt/conda/conda-bld/jupyter_client_1661848916004/work
jupyter_core @ file:///croot/jupyter_core_1668084443243/work
jupyterlab @ file:///tmp/abs_12f3h01vmy/croots/recipe/jupyterlab_1658907535764/work
jupyterlab-pygments @ file:///tmp/build/80754af9/jupyterlab_pygments_1601490720602/work
jupyterlab-server @ file:///opt/conda/conda-bld/jupyterlab_server_1644500396812/work
jupyterlab-widgets @ file:///tmp/build/80754af9/jupyterlab_widgets_1609884341231/work
kdl-parser-py==1.13.3
keyring @ file:///tmp/build/80754af9/keyring_1638531355686/work
kiwisolver @ file:///opt/conda/conda-bld/kiwisolver_1653292039266/work
laser_geometry==1.6.7
lazy-object-proxy @ file:///tmp/build/80754af9/lazy-object-proxy_1616529027849/work
libarchive-c @ file:///tmp/build/80754af9/python-libarchive-c_1617780486945/work
llvmlite==0.38.0
locket @ file:///opt/conda/conda-bld/locket_1652903118915/work
lxml @ file:///opt/conda/conda-bld/lxml_1657545139709/work
lz4 @ file:///tmp/build/80754af9/lz4_1619516502891/work
Markdown @ file:///tmp/build/80754af9/markdown_1614363852612/work
MarkupSafe @ file:///tmp/build/80754af9/markupsafe_1621523467000/work
matplotlib @ file:///opt/conda/conda-bld/matplotlib-suite_1660167928326/work
matplotlib-inline @ file:///opt/conda/conda-bld/matplotlib-inline_1662014470464/work
mccabe @ file:///opt/conda/conda-bld/mccabe_1644221741721/work
message_filters==1.14.13
mistune @ file:///tmp/build/80754af9/mistune_1607364877025/work
mkl-fft==1.3.1
mkl-random @ file:///tmp/build/80754af9/mkl_random_1626186066731/work
mkl-service==2.4.0
mock @ file:///tmp/build/80754af9/mock_1607622725907/work
mpmath==1.2.1
msgpack @ file:///opt/conda/conda-bld/msgpack-python_1652362659880/work
multidict @ file:///croot/multidict_1665674239670/work
multipledispatch @ file:///tmp/build/80754af9/multipledispatch_1607574243360/work
munkres==1.1.4
mypy-extensions==0.4.3
navigator-updater==0.3.0
nbclassic @ file:///croot/nbclassic_1668174957779/work
nbclient @ file:///tmp/build/80754af9/nbclient_1650290509967/work
nbconvert @ file:///opt/conda/conda-bld/nbconvert_1649751911790/work
nbformat @ file:///opt/conda/conda-bld/nbformat_1663744952973/work
nest-asyncio @ file:///tmp/build/80754af9/nest-asyncio_1649847906199/work
netifaces==0.10.6
networkx @ file:///opt/conda/conda-bld/networkx_1657784097507/work
nltk @ file:///opt/conda/conda-bld/nltk_1645628263994/work
nose @ file:///opt/conda/conda-bld/nose_1642704612149/work
notebook @ file:///croot/notebook_1668179881751/work
notebook_shim @ file:///croot/notebook-shim_1668160579331/work
numba @ file:///opt/conda/conda-bld/numba_1648040517072/work
numexpr @ file:///croot/numexpr_1668713893690/work
numpy @ file:///opt/conda/conda-bld/numpy_and_numpy_base_1653915516269/work
numpydoc @ file:///croot/numpydoc_1668085905352/work
olefile @ file:///Users/ktietz/demo/mc3/conda-bld/olefile_1629805411829/work
openpyxl==3.0.10
packaging @ file:///tmp/build/80754af9/packaging_1637314298585/work
pandas==1.4.4
pandocfilters @ file:///opt/conda/conda-bld/pandocfilters_1643405455980/work
panel @ file:///croot/panel_1668084610474/work
param @ file:///croot/param_1668766977946/work
parsel @ file:///tmp/build/80754af9/parsel_1646722533460/work
parso @ file:///opt/conda/conda-bld/parso_1641458642106/work
partd @ file:///opt/conda/conda-bld/partd_1647245470509/work
pathlib @ file:///Users/ktietz/demo/mc3/conda-bld/pathlib_1629713961906/work
pathspec @ file:///tmp/abs_1foqurpsov/croots/recipe/pathspec_1659627126545/work
patsy==0.5.2
pep8==1.7.1
pexpect @ file:///tmp/build/80754af9/pexpect_1605563209008/work
pickleshare @ file:///tmp/build/80754af9/pickleshare_1606932040724/work
Pillow==9.2.0
pkginfo @ file:///croot/pkginfo_1666725041340/work
platformdirs @ file:///opt/conda/conda-bld/platformdirs_1662711380096/work
plotly @ file:///tmp/abs_7afcdfad-dbbb-49d2-adea-186abf525c45jbnd8p95/croots/recipe/plotly_1658160053621/work
pluggy @ file:///tmp/build/80754af9/pluggy_1648024445381/work
ply==3.11
poyo @ file:///tmp/build/80754af9/poyo_1617751526755/work
prometheus-client @ file:///tmp/abs_d3zeliano1/croots/recipe/prometheus_client_1659455100375/work
prompt-toolkit @ file:///tmp/build/80754af9/prompt-toolkit_1633440160888/work
Protego @ file:///tmp/build/80754af9/protego_1598657180827/work
protobuf==3.20.1
psutil @ file:///opt/conda/conda-bld/psutil_1656431268089/work
ptyprocess @ file:///tmp/build/80754af9/ptyprocess_1609355006118/work/dist/ptyprocess-0.7.0-py2.py3-none-any.whl
pure-eval @ file:///opt/conda/conda-bld/pure_eval_1646925070566/work
py @ file:///opt/conda/conda-bld/py_1644396412707/work
pyasn1 @ file:///Users/ktietz/demo/mc3/conda-bld/pyasn1_1629708007385/work
pyasn1-modules==0.2.8
pycodestyle @ file:///tmp/build/80754af9/pycodestyle_1636635402688/work
pycosat @ file:///croot/pycosat_1666805502580/work
pycparser @ file:///tmp/build/80754af9/pycparser_1636541352034/work
pyct @ file:///tmp/abs_68a517ee-55fb-480e-82ab-1a8adb440a58x7qfc024/croots/recipe/pyct_1658500310800/work
pycurl==7.45.1
PyDispatcher==2.0.5
pydocstyle @ file:///tmp/build/80754af9/pydocstyle_1621600989141/work
pyerfa @ file:///tmp/build/80754af9/pyerfa_1621556109336/work
pyflakes @ file:///tmp/build/80754af9/pyflakes_1636644436481/work
Pygments @ file:///opt/conda/conda-bld/pygments_1644249106324/work
PyHamcrest @ file:///tmp/build/80754af9/pyhamcrest_1615748656804/work
PyJWT @ file:///opt/conda/conda-bld/pyjwt_1657544592787/work
pylint @ file:///tmp/abs_6fxmc66kyk/croots/recipe/pylint_1659110350161/work
pyls-spyder==0.4.0
pyodbc @ file:///tmp/abs_d365zrcsdp/croots/recipe/pyodbc_1659513794382/work
pyOpenSSL @ file:///opt/conda/conda-bld/pyopenssl_1643788558760/work
pyparsing @ file:///opt/conda/conda-bld/pyparsing_1661452539315/work
PyQt5==5.15.7
PyQt5-Qt5==5.15.2
PyQt5-sip==12.11.0
PyQtWebEngine==5.15.6
PyQtWebEngine-Qt5==5.15.2
pyrsistent @ file:///tmp/build/80754af9/pyrsistent_1636110951836/work
PySocks @ file:///tmp/build/80754af9/pysocks_1605305812635/work
pytest==7.1.2
python-dateutil @ file:///tmp/build/80754af9/python-dateutil_1626374649649/work
python-engineio @ file:///tmp/build/80754af9/python-engineio_1618814346232/work
python-lsp-black @ file:///opt/conda/conda-bld/python-lsp-black_1661852031497/work
python-lsp-jsonrpc==1.0.0
python-lsp-server @ file:///opt/conda/conda-bld/python-lsp-server_1661813814476/work
python-slugify @ file:///tmp/build/80754af9/python-slugify_1620405669636/work
python-snappy @ file:///tmp/build/80754af9/python-snappy_1610133040135/work
python-socketio @ file:///tmp/build/80754af9/python-socketio_1624540179952/work
python_qt_binding==0.4.4
pytz @ file:///opt/conda/conda-bld/pytz_1654762638606/work
pyviz-comms @ file:///tmp/build/80754af9/pyviz_comms_1623747165329/work
PyWavelets @ file:///tmp/build/80754af9/pywavelets_1648710015787/work
pyxdg @ file:///tmp/build/80754af9/pyxdg_1603822279816/work
PyYAML==6.0
pyzmq @ file:///opt/conda/conda-bld/pyzmq_1657724186960/work
QDarkStyle @ file:///tmp/build/80754af9/qdarkstyle_1617386714626/work
qstylizer @ file:///tmp/build/80754af9/qstylizer_1617713584600/work/dist/qstylizer-0.1.10-py2.py3-none-any.whl
qt-dotgraph==0.4.2
qt-gui==0.4.2
qt-gui-cpp==0.4.2
qt-gui-py-common==0.4.2
QtAwesome @ file:///tmp/build/80754af9/qtawesome_1637160816833/work
qtconsole @ file:///opt/conda/conda-bld/qtconsole_1662018252641/work
QtPy @ file:///opt/conda/conda-bld/qtpy_1662014892439/work
queuelib==1.5.0
regex @ file:///tmp/abs_41f5bce5-0a2e-45aa-b231-1fd2fbd57753gfpe6sjm/croots/recipe/regex_1658257178822/work
requests @ file:///opt/conda/conda-bld/requests_1657734628632/work
requests-file @ file:///Users/ktietz/demo/mc3/conda-bld/requests-file_1629455781986/work
resource_retriever==1.12.7
rope @ file:///opt/conda/conda-bld/rope_1643788605236/work
rosbag==1.14.13
rosboost-cfg==1.14.9
rosclean==1.14.9
roscreate==1.14.9
rosgraph==1.14.13
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roslint==0.11.2
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rosservice==1.14.13
rostest==1.14.13
rostopic==1.14.13
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rqt-reconfigure==0.5.4
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rqt_bag_plugins==0.5.1
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rqt_gui_py==0.5.3
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rqt_launch==0.4.8
rqt_logger_level==0.4.8
rqt_msg==0.4.8
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rqt_plot==0.4.13
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rqt_robot_steering==0.5.10
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rsa @ file:///tmp/build/80754af9/rsa_1614366226499/work
Rtree @ file:///tmp/build/80754af9/rtree_1618420843093/work
ruamel-yaml-conda @ file:///tmp/build/80754af9/ruamel_yaml_1616016711199/work
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s3transfer @ file:///opt/conda/conda-bld/s3transfer_1654524197066/work
scikit-image @ file:///tmp/build/80754af9/scikit-image_1648214171611/work
scikit-learn @ file:///tmp/build/80754af9/scikit-learn_1642617106979/work
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scipy @ file:///tmp/build/80754af9/scipy_1641555004408/work
Scrapy @ file:///tmp/abs_e3bmwi01y8/croots/recipe/scrapy_1659598696235/work
seaborn @ file:///croot/seaborn_1666299130744/work
SecretStorage @ file:///tmp/build/80754af9/secretstorage_1614022780358/work
Send2Trash @ file:///tmp/build/80754af9/send2trash_1632406701022/work
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service-identity @ file:///Users/ktietz/demo/mc3/conda-bld/service_identity_1629460757137/work
sip @ file:///tmp/abs_44cd77b_pu/croots/recipe/sip_1659012365470/work
six @ file:///tmp/build/80754af9/six_1644875935023/work
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smart-open @ file:///opt/conda/conda-bld/smart_open_1651563547610/work
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sniffio @ file:///tmp/build/80754af9/sniffio_1614030464178/work
snowballstemmer @ file:///tmp/build/80754af9/snowballstemmer_1637937080595/work
socketio==0.2.1
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soupsieve @ file:///croot/soupsieve_1666296392845/work
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sphinxcontrib-qthelp @ file:///home/ktietz/src/ci/sphinxcontrib-qthelp_1611921055322/work
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spyder @ file:///opt/conda/conda-bld/spyder_1663056818299/work
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SQLAlchemy @ file:///tmp/abs_18b3238f-9c23-4182-a392-63af30a93c1er8j_yw60/croots/recipe/sqlalchemy_1657867856580/work
stack-data @ file:///opt/conda/conda-bld/stack_data_1646927590127/work
statsmodels @ file:///tmp/build/80754af9/statsmodels_1648015433305/work
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tables @ file:///tmp/build/80754af9/pytables_1607975397488/work
tabulate @ file:///opt/conda/conda-bld/tabulate_1657784105888/work
TBB==0.2
tblib @ file:///Users/ktietz/demo/mc3/conda-bld/tblib_1629402031467/work
tenacity @ file:///tmp/abs_9ca5cd06-f53b-4ea6-8eea-954e11157fddo5mhurpp/croots/recipe/tenacity_1657899103026/work
terminado @ file:///tmp/build/80754af9/terminado_1644322582718/work
testpath @ file:///opt/conda/conda-bld/testpath_1655908557405/work
text-unidecode @ file:///Users/ktietz/demo/mc3/conda-bld/text-unidecode_1629401354553/work
textdistance @ file:///tmp/build/80754af9/textdistance_1612461398012/work
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tinycss @ file:///tmp/build/80754af9/tinycss_1617713798712/work
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toml @ file:///tmp/build/80754af9/toml_1616166611790/work
tomli @ file:///opt/conda/conda-bld/tomli_1657175507142/work
tomlkit @ file:///tmp/abs_56_0lnnq5x/croots/recipe/tomlkit_1658946880479/work
toolz @ file:///croot/toolz_1667464077321/work
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Twisted @ file:///tmp/abs_82802zpkox/croots/recipe/twisted_1659592759417/work
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typing_extensions @ file:///tmp/abs_ben9emwtky/croots/recipe/typing_extensions_1659638822008/work
ujson @ file:///opt/conda/conda-bld/ujson_1657544923770/work
Unidecode @ file:///tmp/build/80754af9/unidecode_1614712377438/work
urdfdom-py==0.4.6
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w3lib @ file:///Users/ktietz/demo/mc3/conda-bld/w3lib_1629359764703/work
watchdog @ file:///tmp/build/80754af9/watchdog_1638367282716/work
wcwidth @ file:///Users/ktietz/demo/mc3/conda-bld/wcwidth_1629357192024/work
webencodings==0.5.1
websocket-client @ file:///tmp/build/80754af9/websocket-client_1614803975924/work
Werkzeug @ file:///opt/conda/conda-bld/werkzeug_1645628268370/work
whatthepatch @ file:///opt/conda/conda-bld/whatthepatch_1661795988879/work
widgetsnbextension==3.6.1
wrapt @ file:///tmp/abs_c335821b-6e43-4504-9816-b1a52d3d3e1eel6uae8l/croots/recipe/wrapt_1657814400492/work
wurlitzer @ file:///tmp/build/80754af9/wurlitzer_1638368168359/work
xacro==1.13.18
xarray @ file:///croot/xarray_1668776594578/work
xlrd @ file:///tmp/build/80754af9/xlrd_1608072521494/work
XlsxWriter @ file:///opt/conda/conda-bld/xlsxwriter_1649073856329/work
yapf @ file:///tmp/build/80754af9/yapf_1615749224965/work
yarl @ file:///opt/conda/conda-bld/yarl_1661437085904/work
zict==2.1.0
zipp @ file:///opt/conda/conda-bld/zipp_1652341764480/work
zope.interface @ file:///tmp/build/80754af9/zope.interface_1625036153595/work

pip freeze (server):
This is not working as it runs on a Xilinx board, it seems that pip isn't installed. But I can tell the flask-socketio version I added into it: 5.3.1.

[miguelgrinberg]

It is impossible for me to know what versions you have of some dependencies because you are building them yourself. What versions are these in the client?

python-engineio @ file:///tmp/build/80754af9/python-engineio_1618814346232/work
python-socketio @ file:///tmp/build/80754af9/python-socketio_1624540179952/work

And how do these versions compare to the ones you have installed in your server? The error is very likely caused by version incompatibilities among Flask-SocketIO and its dependencies.

[ghost]

Thank you Miguel for your answer.

Here the versions:
Client:
python-engineio: 4.1.0
python-socketio: 5.3.0

Server:
python-engineio: 3.9.3
python-socketio: 4.3.1

I do have to mention I add them on the board via Yocto using open-embedded Python packages.

Hope this helps.

[ghost]

Oh I guess I got it. I should match the same versions as described here, is that right?

[miguelgrinberg]

Correct. The three packages must use versions from the same line in the table.

[ghost]

Miguel, thanks again for your help.
Your clue about version numbers did the trick. I updated everything to match the requirements. I also needed to add manually some packages as they were not available within Yocto - meta-openembedded packages (version 2020).
But now it works well.