CHANGES.rst

pySerial Release Notes

Version 1.0 13 Feb 2002

• First public release.
• Split from the pybsl application (see http://mspgcc.sourceforge.net)

New Features:

• Added Jython support

Version 1.1 14 Feb 2002

Bugfixes:

• Win32, when not specifying a timeout
• Typos in the Docs

New Features:

• added serialutil which provides a base class for the Serial objects.
• readline, readlines, writelines and flush are now supported see README.txt for deatils.

Version 1.11 14 Feb 2002

Same as 1.1 but added missing files.

Version 1.12 18 Feb 2002

Removed unneded constants to fix RH7.x problems.

Version 1.13 09 Apr 2002

Added alternate way for enabling rtscts (CNEW_RTSCTS is tried too) If port opening fails, a SerialException is raised on all platforms

Version 1.14 29 May 2002

Added examples to archive Added non-blocking mode for timeout=0 (tnx Mat Martineau)

Bugfixes:

• win32 does now return the remaining characters on timeout

Version 1.15 04 Jun 2002

Bugfixes (win32):

• removed debug messages
• compatibility to win9x improved

Version 1.16 02 Jul 2002

Added implementation of RI and corrected RTS/CTS on Win32

Version 1.17 03 Jul 2002

Silly mix of two versions in win32 code corrected

Version 1.18 06 Dec 2002

Bugfixes (general):

• remove the mapping of flush to the destructive flushOutput as this is not the expected behaviour.
• readline: EOL character for lines can be chosen idea by John Florian.

Bugfixes (posix):

• cygwin port numbering fixed
• test each and every constant for it's existence in termios module, use default if not existent (fix for Bug item #640214)
• wrong exception on nonexistent ports with /dev file. bug report by Louis Cordier

Bugfixes (win32):

• RTS/CTS handling as suggested in Bug #635072
• bugfix of timeouts brought up by Markus Hoffrogge

Version 1.19 19 Mar 2003

Bugfixes (posix):

• removed dgux entry which actually had a wrong comment and is probably not in use anywhere.

Bugfixes (win32):

• added int() conversion, [Bug 702120]
• remove code to set control lines in close method of win32 version. [Bug 669625]

Version 1.20 28 Aug 2003

• Added serial.device() for all platforms

Bugfixes (win32):

• don't recreate overlapped structures and events on each read/write.
• don't set unneeded event masks.
• don't use DOS device names for ports > 9.
• remove send timeout (it's not used in the linux impl. anyway).

Version 1.21 30 Sep 2003

Bugfixes (win32):

• name for COM10 was not built correctly, found by Norm Davis.

Bugfixes (examples):

• small change in miniterm.py that should mage it run on cygwin, [Bug 809904] submitted by Rolf Campbell.

Version 2.0b1 1 Oct 2003

Transition to the Python 2.0 series:

• New implementation only supports Python 2.2+, backwards compatibility should be maintained almost everywhere. The OS handles (like the hComPort or fd attribute) were prefixed with an underscore. The different names stay, as anyone that uses one of these has to write platform specific code anyway.
• Common base class serialutil.SerialBase for all implementations.
• PARITY_NONE, PARITY_EVEN, PARITY_ODD constants changed and all these constants moved to serialutil.py (still available as serial.PARITY_NONE etc. and they should be used that way)
• Added serial.PARITY_NAMES (implemented in serialutil.PARITY_NAMES). This dictionary can be used to convert parity constants to meaningful strings.
• Each Serial class and instance has a list of supported values: BAUDRATES, BYTESIZES, PARITIES, STOPBITS``Ggg (i.e. ``serial.Serial.BAUDRATES or s = serial.Serial; s.BAUDRATES) these values can be used to fill in value sin GUI dialogs etc.
• Creating a Serial() object without port spec returns an unconfigured, closed port. Useful if a GUI dialog should take a port and configure it.
• New methods for serial.Serial instances: open(), isOpen()
• A port can be opened and closed as many times as desired.
• Instances of serial.Serial have baudrate, bytesize, timeout etc. attributes implemented as properties, all can be set while the port is opened. It will then be reconfigured.
• Improved __doc__'s.
• New test_advanced.py for the property setting/getting testing.
• Small bugfix on posix with get* methods (return value should be true a boolean).
• added a __repr__ that returns a meaningful string will all the serial setting, easy for debugging.
• The serialposix module does not throw an exception on unsupported platforms, the message is still printed. The idea that it may still work even if the platform itself s not known, it simply tries to do the posix stuff anyway (It's likely that opening ports by number fails, but by name it should work).

Version 2.0b2 4 Oct 2003

• Added serial port configuration dialog for wxPython to the examples.
• Added terminal application for wxPython with wxGlade design file to the examples.
• Jython support is currently broken as Jython does not have a Python 2.2 compatible release out yet

Version 2.0 6 Nov 2003

• Fixes setup.py for older distutils

Version 2.1 28 Jul 2004

Bugfixes:

• Fix XON/XOFF values [Bug 975250]

Bugfixes (posix):

• fd == 0 fix from Vsevolod Lobko
• netbsd fixes from Erik Lindgren
• Dynamically lookup baudrates and some cleanups

Bugfixes (examples):

• CRLF handling of miniterm.py should be more consistent on Win32 and others. Added LF only command line option
• Multithreading fixes to wxTerminal.py (helps with wxGTK)
• Small change for wxPython 2.5 in wxSerialConfigDialog.py [Bug 994856]

New Features:

• Implement write timeouts (writeTimeout parameter)

Version 2.2 31 Jul 2005

Bugfixes:

• [Bug 1014227]: property <del> broken
• [Bug 1105687]: serial_tcp_example.py: --localport option
• [Bug 1106313]: device (port) strings cannot be unicode

Bugfixes (posix):

• [Patch 1043436] Fix for [Bug 1043420] (OSError: EAGAIN)
• [Patch 1102700] fileno() added
• ensure disabled PARMRK

Bugfixes (win32):

• [Patch 983106]: keep RTS/CTS state on port setting changes

New Features:

• dsrdtr setting to enable/disable DSR/DTR flow control independently from the rtscts setting. (Currently Win32 only, ignored on other platforms)

Version 2.3 19 Jun 2008

New Features:

• iterator interface. for line in Serial(...): ... is now possible Suggested by Bernhard Bender
• sendBreak() accepts a duration argument. Default duration increased.
• win32 handles \.COMx format automatically for com ports of higher number (COM10 is internally translated to \.COM10 etc.)
• miniterm.py has a new feature to send a file (upload) and configurable special characters for exit and upload. Refactored internals to class based structure (upload and class refactoring by Colin D Bennett)

Bugfixes:

• [Bug 1451535] TCP/serial redirect example "--help"
• update VERSION variable
• update wxSerialConfigDialog.py and wxTerminal.py compatibility with wxPython 2.8 (Peleg)
• Check for string in write function. Using unicode causes errors, this helps catching errors early (Tom Lynn)

Bugfixes (posix):

• [Bug 1554183] setRTS/setDTR reference to non existing local "on"
• [Bug 1513653] file descriptor not closed when exception is thrown
• FreeBSD now uses cuadX instead of cuaaX (Patrick Phalen)

Bugfixes (win32):

• [Bug 1520357] Handle leak
• [Bug 1679013] Ignore exception raised by SetCommTimeout() in close().
• [Bug 1938118] process hang forever under XP

Version 2.4 6 Jul 2008

New Features:

• [Patch 1616790] pyserial: Add inter-character timeout feature
• [Patch 1924805] add a setBreak function
• Add mark/space parity
• Add .NET/Mono backend (IronPython)

Bugfixes (posix):

• [Bug 1783159] Arbitrary baud rates (Linux/Posix)

Bugfixes (win32):

• [Patch 1561423] Add mark/space parity, Win32
• [Bug 2000771] serial port CANNOT be specified by number on windows
• examples/scanwin32.py does no longer return \.names
• fix \.handling for some cases

Bugfixes (jython):

• The Jython backend tries javax.comm and gnu.io (Seo Sanghyeon)

Version 2.5-rc1 2009-07-30

New Features:

• Python 3.x support (through 2to3)
• compatible with Python io library (Python 2.6+)
• Support for Win32 is now written on the top of ctypes (bundled with Python 2.5+) instead of pywin32 (patch by Giovanni Bajo).
• 1.5 stop bits (STOPBITS_ONE_POINT_FIVE, implemented on all platforms)
• miniterm application extended (CTRL+T -> menu)
• miniterm.py is now installed as "script"
• add scanlinux.py example
• add port_publisher example
• experimental RFC-2217 server support (examples/rfc2217_server.py)
• add getSettingsDict and applySettingsDict serial object methods
• use a poll based implementation on Posix, instead of a select based, provides better error handling [removed again in later releases].

Bugfixes:

• Improve and fix tcp_serial_redirector example.
• [Bug 2603052] 5-bit mode (needs 1.5 stop bits in some cases)

Bugfixes (posix):

• [Bug 2810169] Propagate exceptions raised in serialposix _reconfigure
• [Bug 2562610] setting non standard baud rates on Darwin (Emmanuel Blot)

Bugfixes (win32):

• [Bug 2469098] parity PARITY_MARK, PARITY_SPACE isn't supported on win32
• [SF 2446218] outWaiting implemented
• [Bug 2392892] scanwin32.py better exception handling
• [Bug 2505422] scanwin32.py Vista 64bit compatibility

Version 2.5-rc2 2010-01-02

New Features:

• Documentation update, now written with Sphinx/ReST
• Updated miniterm.py example
• experimental RFC-2217 client support (serial.rfc2217.Serial, see docs)
• add loop:// device for testing.
• add serial.serial_for_url factory function (support for native ports and rfc2217, socket and loop URLs)
• add new example: rfc2217_server.py
• tests live in their own directory now (no longer in examples)

Bugfixes:

• [Bug 2915810] Fix for suboption parsing in rfc2217
• Packaging bug (missed some files)

Bugfixes (posix):

• improve write timeout behavior
• [Bug 2836297] move Linux specific constants to not break other platforms
• poll based implementation for read is in a separate class PosixPollSerial, as it is not supported well on all platforms (the default Serial class uses select).
• changed error handling in read so that disconnected devices are detected.

Bugfixes (win32):

• [Bug 2886763] hComPort doesn't get initialized for Serial(port=None)

Version 2.5 2010-07-22

New Features:

• [Bug 2976262] dsrdtr should default to False dsrdtr parameter default value changed from None (follow rtscts setting) to False. This means rtscts=True enables hardware flow control on RTS/CTS but no longer also on DTR/DSR. This change mostly affects Win32 as on other platforms, that setting was ignored anyway.
• Improved xreadlines, it is now a generator function that yields lines as they are received (previously it called readlines which would only return all lines read after a read-timeout). However xreadlines is deprecated and not available when the io module is used. Use for line in Serial(...): instead.

Bugfixes:

• [Bug 2925854] test.py produces exception with python 3.1
• [Bug 3029812] 2.5rc2 readline(s) doesn't work

Bugfixes (posix):

• [BUG 3006606] Nonblocking error - Unix platform

Bugfixes (win32):

• [Bug 2998169] Memory corruption at faster transmission speeds. (bug introduced in 2.5-rc1)

Version 2.6 2011-11-02

New Features:

• Moved some of the examples to serial.tools so that they can be used with python -m
• serial port enumeration now included as serial.tools.list_ports
• URL handlers for serial_for_url are now imported dynamically. This allows to add protocols w/o editing files. The list serial.protocol_handler_packages can be used to add or remove user packages with protocol handlers (see docs for details).
• new URL type: hwgrep://<regexp> uses list_ports module to search for ports by their description
• several internal changes to improve Python 3.x compatibility (setup.py, use of absolute imports and more)

Bugfixes:

• [Bug 3093882] calling open() on an already open port now raises an exception
• [Bug 3245627] connection-lost let rfc2217 hangs in closed loop
• [Patch 3147043] readlines() to support multi-character eol

Bugfixes (posix):

• [Patch 3316943] Avoid unneeded termios.tcsetattr calls in serialposix.py
• [Patch 2912349] Serial Scan as a Module with Mac Support

Bugfixes (win32):

• [Bug 3057499] writeTimeoutError when write Timeout is 0
• [Bug 3414327] Character out of range in list_ports_windows
• [Patch 3036175] Windows 98 Support fix
• [Patch 3054352] RTS automatic toggle, for RS485 functionality.
• Fix type definitions for 64 bit Windows compatibility

Version 2.7 2013-10-17

• Win32: setRTS and setDTR can be called before the port is opened and it will set the initial state on port open.
• Posix: add platform specific method: outWaiting (already present for Win32)
• Posix: rename flowControl to setXON to match name on Win32, add flowControlOut function
• rfc2217: zero polls value (baudrate, data size, stop bits, parity) (Erik Lundh)
• Posix: [Patch pyserial:28] Accept any speed on Linux [update]
• Posix: [Patch pyserial:29] PosixSerial.read() should "ignore" errno.EINTR
• OSX: [Patch pyserial:27] Scan by VendorID/Product ID for USB Serial devices
• Ensure working with bytes in write() calls

Bugfixes:

• [Bug 3540332] SerialException not returned
• [Bug pyserial:145] Error in socket_connection.py
• [Bug pyserial:135] reading from socket with timeout=None causes TypeError
• [Bug pyserial:130] setup.py should not append py3k to package name
• [Bug pyserial:117] no error on lost conn w/socket://

Bugfixes (posix):

• [Patch 3462364] Fix: NameError: global name 'base' is not defined
• list_ports and device() for BSD updated (Anders Langworthy)
• [Bug 3518380] python3.2 -m serial.tools.list_ports error
• [Bug pyserial:137] Patch to add non-standard baudrates to Cygwin
• [Bug pyserial:141] open: Pass errno from IOError to SerialException
• [Bug pyserial:125] Undefined 'base' on list_ports_posix.py, function usb_lsusb
• [Bug pyserial:151] Serial.write() without a timeout uses 100% CPU on POSIX
• [Patch pyserial:30] [PATCH 1/1] serial.Serial() should not raise IOError.

Bugfixes (win32):

• [Bug 3444941] ctypes.WinError() unicode error
• [Bug 3550043] on Windows in tools global name 'GetLastError' is not defined
• [Bug pyserial:146] flush() does nothing in windows (despite docs)
• [Bug pyserial:144] com0com ports ignored due to missing "friendly name"
• [Bug pyserial:152] Cannot configure port, some setting was wrong. Can leave port handle open but port not accessible

Version 3.0a0 2015-09-22

• Starting from this release, only Python 2.7 and 3.2 (or newer) are supported. The source code is compatible to the 2.x and 3.x series without any changes. The support for earlier Python versions than 2.7 is removed, please refer to the pyserial-legacy (V2.x) series if older Python versions are a requirement).
• Development moved to github, update links in docs.
• API changes: properties for rts, dtr, cts, dsr, cd, ri, in_waiting (instead of get/set functions)
• remove file FileLike class, add read_until and iread_until to SerialBase
• RS485 support changed (rts_toggle removed, added serial.rs485 module and rs485_mode property)
• socket:// and rfc2217:// handlers use the IPv6 compatible socket.create_connection
• New URL handler: spy:://.
• URL handlers now require the proper format (? and &) for arguments instead of / (e.g. rfc2217://localhost:7000?ign_set_control&timeout=5.5)
• Remove obsolete examples.
• Finish update to BSD license.
• Use setuptools if available, fall back to distutils if unavailable.
• miniterm: changed command line options
• miniterm: support encodings on serial port
• miniterm: new transformations, by default escape/convert all control characters
• list_ports: improved, added USB location (Linux, Win32)
• refactored code
• [FTR pyserial:37] Support fileno() function in the socket protocol
• Posix: [Patch pyserial:31] Mark/space parity on Linux
• Linux: [Patch pyserial:32] Module list_ports for linux should include the product information as description.
• Java: fix 2 bugs (stop bits if/else and non-integer timeouts) (Torsten Roemer)
• Update wxSerialConfigDialog.py to use serial.tools.list_ports.
• [Patch pyserial:34] Improvements to port_publisher.py example
• [Feature pyserial:39] Support BlueTooth serial port discovery on Linux

Bugfixes:

• [Bug pyserial:157] Implement inWaiting in protocol_socket
• [Bug pyserial:166] RFC2217 connections always fail
• [Bug pyserial:172] applySettingsDict() throws an error if the settings dictionary is not complete
• [Bug pyserial:185] SocketSerial.read() never returns data when timeout==0

Bugfixes (posix):

• [Bug pyserial:156] PosixSerial.open raises OSError rather than SerialException when port open fails
• [Bug pyserial:163] serial.tools.list_ports.grep() fails if it encounters None type
• fix setXON
• [Patch pyserial:36 / 38] Make USB information work in python 3.4 and 2.7
• clear OCRNL/ONLCR flags (CR/LF translation settings)
• [Feature pyserial:38] RS485 Support
• [Bug pyserial:170] list_ports_posix not working properly for Cygwin
• [Bug pyserial:187] improve support for FreeBSD (list_ports_posix)

Bugfixes (win32):

• [Bug pyserial:169] missing "import time" in serialwin32.py

Bugfixes (cli):

• [Bug pyserial:159] write() in serialcli.py not working with IronPython 2.7.4

Version 3.0b1 2015-10-19

• list_ports: add vid, pid, serial_number, product, manufacturer and location attribute for USB devices.
• list_ports: update OSX implementation.
• list_ports: Raspberry Pi: internal port is found.
• serial_for_url: fix import (multiple packages in list)
• threaded: added new module implementing a reader thread
• tweak examples/wx*
• posix: add experimental implementation VTIMESerial
• new URL handler alt:// to select alternative implementations

Version 3.0 2015-12-28

• minor fixes to setup.py (file list), inter_byte_timeout (not stored when passed to __init__), rfc2217 (behavior of close when open failed), list_ports (__str__), loop://, renamed ReaderThread
• hwgrep:// added options to pick n'th port, skip busy ports
• miniterm: --ask option added

Bugfixes (posix):

• [#26/#30] always call tcsettattr on open
• [#42] fix disregard read timeout if there is more data
• [#45] check for write timeout, even if EAGAIN was raised

Bugfixes (win32):

• [#27] fix race condition in read(), fix minimal timeout issue
• race condition in nonblocking case
• [#49] change exception type in case SetCommState fails
• [#50] fixed issue with 0 timeout on windows 10

Version 3.0.1 2016-01-11

• special case for FDTIBUS in list_ports on win32 (#61)

Bugfixes:

• Serial keyword arguments, more on backward compatibility, fix #55
• list_ports: return name if product is None, fix for #54
• port_publisher: restore some sorting of ports

Version 3.1.0 2016-05-27

Improvements:

• improve error handling in alt:// handler
• socket:// internally used select, improves timeout behavior
• initial state of RTS/DTR: ignore error when setting on open posix (support connecting to pty's)
• code style updates
• posix: remove "number_to_device" which is not called anymore
• add cancel_read and cancel_write to win32 and posix implementations

Bugfixes:

• [#68] aio: catch errors and close connection
• [#87] hexlify: update codec for Python 2
• [#100] setPort not implemented
• [#101] bug in serial.threaded.Packetizer with easy fix
• [#104] rfc2217 and socket: set timeout in create_connection
• [#107] miniterm.py fails to exit on failed serial port

Bugfixes (posix):

• [#59] fixes for RTS/DTR handling on open
• [#77] list_ports_osx: add missing import
• [#85] serialposix.py _set_rs485_mode() tries to read non-existing rs485_settings.delay_rts_before_send
• [#96] patch: native RS485 is never enabled

Bugfixes (win32):

• fix bad super call and duplicate old-style __init__ call
• [#80] list_ports: Compatibility issue between Windows/Linux

Version 3.1.1 2016-06-12

Improvements:

• deprecate nonblocking() method on posix, the port is already in this mode.
• style: use .format() in various places instead of "%" formatting

Bugfixes:

• [#122] fix bug in FramedPacket
• [#127] The Serial class in the .NET/Mono (IronPython) backend does not implement the _reconfigure_port method
• [#123, #128] Avoid Python 3 syntax in aio module

Bugfixes (posix):

• [#126] PATCH: Check delay_before_tx/rx for None in serialposix.py
• posix: retry if interrupted in Serial.read

Bugfixes (win32):

• win32: handle errors of GetOverlappedResult in read(), fixes #121

Version 3.2.0 2016-10-14

See 3.2.1, this one missed a merge request related to removing aio.

Version 3.2.1 2016-10-14

Improvements:

• remove serial.aio in favor of separate package, pyserial-asyncio
• add client mode to example tcp_serial_redirect.py
• use of monotonic clock for timeouts, when available (Python 3.3 and up)
• [#169] arbitrary baud rate support for BSD family
• improve tests, improve loop://

Bugfixes:

• [#137] Exception while cancel in miniterm (python3)
• [#143] Class Serial in protocol_loop.py references variable before assigning to it
• [#149] Python 3 fix for threaded.FramedPacket

Bugfixes (posix):

• [#133] _update_dtr_state throws Inappropriate ioctl for virtual serial port created by socat on OS X
• [#157] Broken handling of CMSPAR in serialposix.py

Bugfixes (win32):

• [#144] Use Unicode API for list_ports
• [#145] list_ports_windows: support devices with only VID
• [#162] Write in non-blocking mode returns incorrect value on windows

Version 3.3 2017-03-08

Improvements:

• [#206] Exclusive access on POSIX. exclusive flag added.
• [#172] list_ports_windows: list_ports with 'manufacturer' info property
• [#174] miniterm: change cancel impl. for console
• [#182] serialutil: add overall timeout for read_until
• socket: use non-blocking socket and new Timeout class
• socket: implement a functional a reset_input_buffer
• rfc2217: improve read timeout implementation
• win32: include error message from system in ClearCommError exception
• and a few minor changes, docs

Bugfixes:

• [#183] rfc2217: Fix broken calls to to_bytes on Python3.
• [#188] rfc2217: fix auto-open use case when port is given as parameter

Bugfixes (posix):

• [#178] in read, count length of converted data
• [#189] fix return value of write

Bugfixes (win32):

• [#194] spurious write fails with ERROR_SUCCESS

Version 3.4 2017-07-22

Improvements:

• miniterm: suspend function (temporarily release port, Ctrl-T s)
• [#240] context manager automatically opens port on __enter__
• [#141] list_ports: add interface number to location string
• [#225] protocol_socket: Retry if BlockingIOError occurs in reset_input_buffer.

Bugfixes:

• [#153] list_ports: option to include symlinked devices
• [#237] list_ports: workaround for special characters in port names

Bugfixes (posix):

• allow calling cancel functions w/o error if port is closed
• [#220] protocol_socket: sync error handling with posix version
• [#227] posix: ignore more blocking errors and EINTR, timeout only applies to blocking I/O
• [#228] fix: port_publisher typo

Version 3.5b0 2020-09-21

New Features:

• [#411] Add a backend for Silicon Labs CP2110/4 HID-to-UART bridge. (depends on hid module)

Improvements:

• [#315] Use absolute import everywhere
• [#351] win32: miniterm Working CMD.exe terminal using Windows 10 ANSI support
• [#354] Make ListPortInfo hashable
• [#372] threaded: "write" returns byte count
• [#400] Add bytesize and stopbits argument parser to tcp_serial_redirect
• [#408] loop: add out_waiting
• [#495] list_ports_linux: Correct "interface" property on Linux hosts
• [#500] Remove Python 3.2 and 3.3 from test
• [#261, #285, #296, #320, #333, #342, #356, #358, #389, #397, #510] doc updates
• miniterm: add CTRL+T Q as alternative to exit
• miniterm: suspend function key changed to CTRL-T Z
• add command line tool entries pyserial-miniterm (replaces miniterm.py) and pyserial-ports (runs serial.tools.list_ports).
• python -m serial opens miniterm (use w/o args and it will print port list too) [experimental]

Bugfixes:

• [#371] Don't open port if self.port is not set while entering context manager
• [#437, #502] refactor: raise new instances for PortNotOpenError and SerialTimeoutException
• [#261, #263] list_ports: set default name attribute
• [#286] fix: compare only of the same type in list_ports_common.ListPortInfo
• rfc2217/close(): fix race-condition
• [#305] return b'' when connection closes on rfc2217 connection
• [#386] rfc2217/close(): fix race condition
• Fixed flush_input_buffer() for situations where the remote end has closed the socket.
• [#441] reset_input_buffer() can hang on sockets
• examples: port_publisher python 3 fixes
• [#324] miniterm: Fix miniterm constructor exit_character and menu_character
• [#326] miniterm: use exclusive access for native serial ports by default
• [#497] miniterm: fix double use of CTRL-T + s use z for suspend instead
• [#443, #444] examples: refactor wx example, use Bind to avoid deprecated warnings, IsChecked, unichr

Bugfixes (posix):

• [#265] posix: fix PosixPollSerial with timeout=None and add cancel support
• [#290] option for low latency mode on linux
• [#335] Add support to xr-usb-serial ports
• [#494] posix: Don't catch the SerialException we just raised
• [#519] posix: Fix custom baud rate to not temporarily set 38400 baud rates on linux
• [#509 #518] list_ports: use hardcoded path to library on osx

Bugfixes (win32):

• [#481] win32: extend RS485 error messages
• [#303] win32: do not check for links in serial.tools.list_ports
• [#430] Add WaitCommEvent function to win32
• [#314, #433] tools/list_ports_windows: Scan both 'Ports' and 'Modem' device classes
• [#414] Serial number support for composite USB devices
• Added recursive search for device USB serial number to support composite devices

Bugfixes (MacOS):

• [#364] MacOS: rework list_ports to support unicode product descriptors.
• [#367] Mac and bsd fix _update_break_state

Version 3.5 2020-11-23

See above (3.5b0) for what's all new in this release

Bugfixes:

• spy: ensure bytes in write()

Bugfixes (posix):

• [#540] serialposix: Fix inconsistent state after exception in open()

Bugfixes (win32):

• [#530] win32: Fix exception for composite serial number search on Windows

Bugfixes (MacOS):

• [#542] list_ports_osx: kIOMasterPortDefault no longer exported on Big Sur
• [#545, #545] list_ports_osx: getting USB info on BigSur/AppleSilicon