This is an adaption of the ftplib module from the CPython standard library to
MicroPython. Apart from making it compatible with the socket module
implementation of MicroPython and removing the use of the re library, some
parts of the original library have been removed and the code and docstrings
have been cleaned up somewhat.
The FTP_TLS class has been moved to a separate module file (ftplibtls.py)
and the all_errors module global variable has been removed. The test code has
been moved to a separate script and reworked too. The ftpcp function has been
moved to the ftpcp.py module file.
The code has been tested only under the unix, esp8266 and esp32 ports of MicroPython and against the FTP server from the pyftpdlib package.
For the esp8266 port the code needed to be slighty altered to make it work
with the ssl module there and to reduce the memory usage. This version can
be found in the esp directory. See the file README.md in that
directory for esp8266-specific instructions. This version also works with the
esp32 port.
The calls to socket.bind(...) and socket.connect(...) are now in a form expected by PicoW