cannot load module websockets

[kthanigaivel]

Traceback (most recent call last): File "", line 148, in File "MicroWebSrv2/microWebSrv2.py", line 136, in LoadModule MicroWebSrv2Exception: Cannot load module "WebSockets".

[fberier]

I got the same with esp32 module

[jczic]

Hello, Is this exception raised from main.py demo? (It's important to use from MicroWebSrv2 import * to import the lib and modules).

[bennyzen]

yes, it's raised from main.py using freshly cloned demo. any clue?

[jczic]

Ok, could you try this code in terminal and give me the result please:

from MicroWebSrv2  import *
print(MicroWebSrv2.__module__)

And also, could you check if __import__ function exists in your MicroPython version.

Thank you for your help!

[ianmxyz]

I'm having the same problem, this is the result of doing as you ask:

`>>>

from MicroWebSrv2 import * print(MicroWebSrv2.module) MicroWebSrv2.microWebSrv2 `

[ianmxyz]

And also, could you check if __import__ function exists in your MicroPython version.

I guess not . . .

(for some reason some of the characters are stripped out once I post this comment, including underscore and anything within quotes. Posting it as code doesn't help. )

from import import * Traceback (most recent call last): File "", line 1, in ImportError: no module named 'import

[jczic]

You must not import __import__ but just check if this native function exists just by typing __import__ in your terminal.

[ianmxyz]

It appears that it does.

[CwbhX]

aaaaand I have the same issue :) and the WebSockets part is the coolest part to me haha. Also an ESP32

[CwbhX]

Well I got some updates: memory allocation failed, allocating 88 bytes I put a simple: except Exception as e: print(e) before your raise MicroWebSrv2Exception('Cannot load module "%s".' % modName)

Any clue how we might be able to fix this, doesn't seem like too many bytes to allocate for an ESP32

Update: I put some debug mem_free() calls in the LoadModule func to see how much ram in the heap is available... and in the call before WebSockets ( the PyhtmlTemplate load module) and the websockets load call I have this now:

MPY: soft reboot

       ---------------------------
       - Python pkg MicroWebSrv2 -
       -      version 2.0.6      -
       -     by JC`zic & HC2     -
       ---------------------------

 + [@WebRoute] GET /test-redir
 + [@WebRoute] GET /test-post (TestPost1/2)
 + [@WebRoute] POST /test-post (TestPost2/2)

Available memory (bytes): 26416
Available memory (bytes): 31920
memory allocation failed, allocating 299 bytes
Traceback (most recent call last):
  File "main.py", line 152, in <module>
  File "MicroWebSrv2/microWebSrv2.py", line 139, in LoadModule
MicroWebSrv2Exception: Cannot load module "WebSockets".
MicroPython v1.12-35-g10709846f on 2020-01-06; ESP32 module with ESP32

Update AGAIN woo (the woo doesn't mean its fixed): So this time I added some of those classic print lines to see where we encounter our lovely memory allocation failed problem and I'm here to report it is the line: module = getattr(__import__(modPath).mods, modName) ... and then it gets a little too involved in WebSockets for me at 1AM so, Bonjour cause I guess its 7AM there. Thanks @jczic for the awesome library nonetheless :)

[ianmxyz]

I had to comment out the call to start websockets before it would work AND change self.slotCount to 8.

def SetEmbeddedConfig(self) : self._validateChangeConf() self._backlog = 8 self._slotsCount = 8 self._slotsSize = 1024 self._keepAlloc = True self._maxContentLen = 16*1024

[ianmxyz]

Also call to PyhtlmlTemplate is commented out, so I guess the whole LoadModule function isn't working.

[CwbhX]

@ianmxyz I'm sorry, where is this

[ianmxyz]

@ianmxyz I'm sorry, where is this

The SetEmbeddedConfig is in microWebSrv2.py around line 340.

[CwbhX]

Sooo, I got it working on my 4Mb PSRAM ESP32 and the appropriate version of Micropython. Therefore, I really think it is the library just using too many resources :/

[ianmxyz]

Sooo, I got it working on my 4Mb PSRAM ESP32 and the appropriate version of Micropython. Therefore, I really think it is the library just using too many resources :/

How did you get it working exactly? Using Micropython2? Also did you get websockets working?

[CwbhX]

@ianmxyz I'm using an ESP32 with an extra (4Mb) PSRAM module soldered onto the board. The version of micropython is the latest on the website: http://micropython.org/download#esp32 where it says "GENERIC-SPIRAM". But the standard ESP32s I have seemingly don't have enough memory for this library in its current form. And yes everything worked except I didn't have any of the large files on there. Tbh, I'd be curious to try this on my K210 board some time

[ElHyperion]

I'm having no problems with running MWS2 on my ESP32 with the default 2Mb memory space. Did you "freeze" the module by building the MPY firmware yourself instead of using the prebuilt binaries from the website? That's the only way I could run it, I also got mem allocation errors before when I added the library into the filesystem and imported it during runtime.

[CwbhX]

@ElHyperion No, I looked into making them into mpy files but I haven't done that before and it seemed like it doesn't always help tooo much, and I wasn't sure if it was a bug at first or actually memory allocation errors, but good to know that made it work for you! I'm hoping to use this library with my BMS haha

[ianmxyz]

@ianmxyz I'm using an ESP32 with an extra (4Mb) PSRAM module soldered onto the board. The version of micropython is the latest on the website: http://micropython.org/download#esp32 where it says "GENERIC-SPIRAM". But the standard ESP32s I have seemingly don't have enough memory for this library in its current form. And yes everything worked except I didn't have any of the large files on there. Tbh, I'd be curious to try this on my K210 board some time

I've given up and reverted to developing my project on an Onion Omega 2+. Perhaps an overkill but it already runs a webserver so I can keep it all in one place. But it only has 2 channels of hardware PWM and I need 4, I'm using the PWM expansion at the moment. However as ultimately I'll need a 4 channel LED driver I can handle that with I2S in any case. I'm sure the ESP32 is perfectly capable of what I need it to do ultimately.

[joseshiru]

Got the same problem with a ESP-32 + 4MB.

[jczic]

Hm.. have you tested by compiling the firmware with the lib (MicroWebSrv2) included in /frozen?

[bennyzen]

yep, I've tried it with most recent firmware and it just works. confirmed

[bennyzen]

for those of you struggling with the process: just put the whole MicroWebSrv2 folder into ports/esp32/modules, hit make submodules and then make deploy to recompile MicroPython and reflash. Now you should have the webserver baked into your current firmware.

[SolarDaniel]

Concerning LoadModule and other issues

Well, I'm new to Python and github, but maybe my experiences help some other newbies. I'm running microWebSrv2 on a Pycom WiPy3 with 4MB flash. It did not work out of the box, needed some debugging and changes. Pycom microPython's implementation does not support:

• relative imports
• regex \w

Change directory 'libs' to 'lib', Pycom's default.

Changes in file microWebSrv2.py

#from .             import *
#from .httpRequest  import HttpRequest
from urlUtils import *
from XAsyncSockets import *
from httpRequest  import HttpRequest

and in file httpRequest.py

#from   .              import *
#from   .httpResponse  import HttpResponse
from urlUtils import *
from webRoute import *
from httpResponse  import HttpResponse

LoadModule in file microWebSrv2.py didn't work. I don't know the reason, but following change helped:

 #module   = getattr(__import__(modPath).mods, modName)
 module   = getattr(__import__(modPath), modName)

When using route arguments, request will fail, due to regex's missing support for above mentioned features. Following change helped:

#regex += '/([\\w.]*)'
regex += '/([A-Za-z0-9_.]*)'

Finally the webserver runs stable and fast and there is plenty of code space for other tasks.

@jczic Thank you Jean-Christophe for this awesome piece of code.

[berkut0]

Hi, any solution for ESP32? Websocket still not working due failing of module import

instruction in https://github.com/jczic/MicroWebSrv2/issues/21#issuecomment-623881378 doesn't work for my ESP32 Devkitv1

https://github.com/jczic/MicroWebSrv2/issues/21#issuecomment-579795744 sounds great, but too complicated at this point of research (and for windows machines)

[CwbhX]

@berkut0 do you have an ESP32 with additional PSRAM? I found that required

[berkut0]

@berkut0 do you have an ESP32 with additional PSRAM? I found that required

@CwbhX Looks like it has only flash memory and not PSRAM. Is it the reason that cause the failure?

[oniram88]

For everyone that know a little of Docker, this is my simple file to build an image that contains the firmware with the server builded inside:

FROM python:3.9.5-buster

RUN apt-get update && apt-get install -yq \
    build-essential \
    libffi-dev \
    git \
    pkg-config \
    python3-libusb1 \
    git wget libncurses-dev flex bison gperf cmake ninja-build ccache libffi-dev libssl-dev

RUN git clone -b v4.0.2 --recursive https://github.com/espressif/esp-idf.git
RUN /esp-idf/install.sh

RUN git clone -b v1.15 https://github.com/micropython/micropython.git
RUN cd /micropython && make -C mpy-cross

# esp32
RUN git clone -b v2.0.6 --recursive https://github.com/jczic/MicroWebSrv2.git
RUN cp -r /MicroWebSrv2/MicroWebSrv2 /micropython/ports/esp32/modules/MicroWebSrv2
RUN cd /micropython/ports/esp32 && /bin/bash -c 'source /esp-idf/export.sh; make submodules; make'

and with the docker compose file you can copy outside and build in one command

version: "3.8"

services: 
  builder:
    build: .
    volumes: 
      - "./build:/builded"
    command: "cp /micropython/ports/esp32/build-GENERIC/firmware.bin /builded/."

[wattzor]

Any solution if you do not have the extra ram? i go the ESP32 TTGO display and its failing on the import of WebSockets

[FriedrichUthe]

There was nothing I could do about it, endet Up using a different module. Cannot remember which one out of my head but would look it up over the weekend if it helps.

Holen Sie sich Outlook für Androidhttps://aka.ms/AAb9ysg

---

From: wattzor @.> Sent: Thursday, October 7, 2021 6:47:45 PM To: jczic/MicroWebSrv2 @.> Cc: FriedrichUthe @.>; Comment @.> Subject: Re: [jczic/MicroWebSrv2] cannot load module websockets (#21)

Any solution if you do not have the extra ram? i go the ESP32 TTGO display and its failing on the import of WebSockets

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