esptool.py broken on macOS Big Sur Beta

This issue came with the PlatformIO 2.0 IDE update.

Error Message

Traceback (most recent call last):
  File "/Users/phil/.platformio/packages/tool-esptoolpy/esptool.py", line 57, in <module>
    import serial.tools.list_ports as list_ports
  File "/Users/phil/.platformio/penv/lib/python3.8/site-packages/serial/tools/list_ports.py", line 29, in <module>
    from serial.tools.list_ports_posix import comports
  File "/Users/phil/.platformio/penv/lib/python3.8/site-packages/serial/tools/list_ports_posix.py", line 31, in <module>
    from serial.tools.list_ports_osx import comports
  File "/Users/phil/.platformio/penv/lib/python3.8/site-packages/serial/tools/list_ports_osx.py", line 32, in <module>
    kIOMasterPortDefault = ctypes.c_void_p.in_dll(iokit, "kIOMasterPortDefault")
ValueError: dlsym(RTLD_DEFAULT, kIOMasterPortDefault): symbol not found
*** [.pio/build/debug/firmware.bin] Error 1

See: https://github.com/espressif/esptool/issues/540

[valeros]

Thanks!

esptoolpy v3.0 will be used by default in the next platform release. As for now users on Big Sur can override the package directly in their configuration:

platform_packages =
    platformio/tool-esptoolpy @ ~1.30000.0

[PhilippMolitor]

I can confirm this version working: https://github.com/espressif/esptool/blob/cb2060c0d768da38c9aa463e315e187a91f761f8/esptool.py

Maybe use this one for the current PlatformIO build instead?