update esptool

[aparcar]

the currently used usptool version 2.6.1 is outdated and uses python 2. please update to 2.8 and make it use python 3

[aaronjudd]

On macOS Big Sur, the outdated 'esptool' produces a fatal build error:

Traceback (most recent call last): File "esptool.py", line 57, in File "/Library/Python/2.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 389, in load_module File "serial/tools/list_ports.py", line 29, in File "/Library/Python/2.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 389, in load_module File "serial/tools/list_ports_posix.py", line 31, in File "/Library/Python/2.7/site-packages/PyInstaller/loader/pyimod03_importers.py", line 389, in load_module File "serial/tools/list_ports_osx.py", line 32, in ValueError: dlsym(RTLD_DEFAULT, kIOMasterPortDefault): symbol not found Failed to execute script esptool exit status 255 /Applications/Arduino.app/Contents/Java/arduino-builder returned 255 Error compiling for board Wireless Stick.

[koedal]

I have the same error on macOS Monterey 12.0.1 still.

ValueError: dlsym(RTLD_DEFAULT, kIOMasterPortDefault): symbol not found

[viotemp1]

Any way to solve this error on Big Sur dlsym(RTLD_DEFAULT, kIOMasterPortDefault): symbol not found

[koedal]

I fixed it in three steps:

1) Install command line tools from Xcode.

2) Download esptool.py file from the 2.6 release of the tool because that is what version of the ESP Tool Heltec is using. I then changed the #! to be python3 instead of python so it wouldn't use the Mac system version of Python 2.X and replaced the esptool binary with the esptool.py but removed the .py extension.

3) I used python3 and pip on the Mac to install pyserial

cd /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/site-packages

sudo python3 ./pip install --upgrade pyserial