New features:

• Added M20 C and rr_file{s/list} max parameters
• Added support for <fileinfo>.customInfo via ";customInfo" comments in G-code jobs
• Volume label of external drives is reported in the object model where applicable

Changed behaviour:

• Change data type of minor command fraction (#209)
• Allow user-defined macros to be parsed as well by fileinfo requests
• Made CORS check for WebSockets stricter
• Priority codes are preferrably sent to idle channels with the same firmware emulation

Bug fixes:

• Changed M20 S1 to behave like in RRF
• Prioritise M292 to allow custom codes that create blocking message boxes
• Fixed M99 support within system macros
• Added missing slashes to ends of default directories
• M32/M37 could override the file being printed (#206)
• Fixed JSON handling of some OM types and of abstract int/float properties
• Fixed type of outgoing update codes (#204)

New features:

• Upgraded base from .NET 6 to .NET 8
• Implemented high-performance JSON (de-)serialization in all areas using (custom) source generators
• .NET applications using DSF 3.6 libraries can be trimmed and/or AOT-compiled
• M111 can be used to change DCS logging parameters during runtime (see also M111 docs)
• Added MQTT support

API changes:

• Added new IPC command to rewrite codes being intercepted
• Python plugins are now installed installed in their own venv (thanks @stuartofmt)

New features:

• Added new pip install script that also checks for built-in modules (thanks stuartofmt)
• Added support for standalone mode HTTP session keys to DuetHttpClient library
• SSID is now reported in network.interfaces[] if applicable
• Added new HTTP endpoint /machine/model as an alternative to /machine/status

Changed behaviour:

• Introduced new "sbc" root key in favour of deprecated state.dsf... properties
• Removed httpEndpoints root key in favour of sbc?.dsf.httpEndpoints
• Open message boxes are automatically closed in the DSF OM when the controller is disconnected

Bug fixes:

• Fixed potential deadlock caused by code interceptors
• G2/G3 may be repeated as well like G0/G1 in Fanuc mode
• Fixed removal of plugin www files on upgrade/uninstall
• M550 did not update /etc/hosts causing potential problems if no network interface was active
• SBC values in variable indices were not substituted in set command
• Line numbers could be off when handling exceptions from codes
• Fixed issue where missing DNS servers could crash DCS
• Fixed file enumeration in DuetPiManagementPlugin plugin manifest
• Race condition could lead to macro filestream being disposed twice causing potential crash of DCS
• Added missing variable declaration to DSF build script
• Fixed expression queries of plugin values

New features:

• Added recursive parameter to HTTP file/directory delete request
• Added recursive delete functionality for RRF delete requests
• Added support for M472 (delete file or directory)

Changed behaviour:

• Removed obsolete move.workspaceNumber field

Bug fixes:

• Fixed parameter parsing for values consisting of special number formats
• Fixed event log support via M929
• ok was not output after DSF error messages potentially upsetting Repetier Server
• Sometimes code pipeline elements could be marked busy incorrectly leading to potential deadlocks

New features:

• Added support for custom array variables and for assigning individual items
• echo can be used to append contents to a file without NL (aka echo >>>"file" "data")

Changed behaviour:

• Code parser is much more sensitive to invalid code parameters
• Error messages from macros/job files are more condensed to get closer to messages from RRF
• When a code cannot be read (i.e. code input is interrupted), the file is aborted immediately

API changes:

• Flush IPC command can be optionally used to synchronize both file streams
• Enabled Nullable type checks throughout DSF projects
• Added support for null parameter values (e.g. X in G28 X)
• Consolidated API exception classes in DuetAPI library
• Changed async code parser to use Stream type instead of StreamReader
• ObjectModel patch API commands only work in non-SPI mode

Bug fixes:

• Fixed support for M0/M1/M2 as well as underscores in variable names
• Added work-around for non-conform rr_upload requests with invalid content type
• Fixed type of tools[].feedForward and corrected default sensors.probes[].travelSpeed value
• Fixed support for update.sh in update packages (dsf-update.zip which requires RootPluginSupport)
• Updated stat import to add support for recent kernels (thanks Loïc)
• Removed obsolete OM assignment from Job processor
• When a too long code was attempted to be serialized, DCS crashed
• Fixed DateTime encoding

Upgrade notes:

• You MUST be on RepRapFirmare 3.5-b1 in order to process jobs. It will NOT work with 3.4.5 or older!
• The scanner key has been removed from the object model. It is no longer supported

New features:

• Executing codes do not need an individual task any more, instead they are now handled by a new pipeline architecture
• Added support for two file channels, new message box types, and many other improvements made in RRF
• Rewrote much of the meta G-code expression pre-parser and added ability to define custom functions (not yet available via API)
• Added rr_ compatibility layer to DuetWebServer (HTTP calls in standalone mode)

Bug fixes:

• Code parser could terminate strings too early
• Fixed issue when parsing the end of a file where a multi-byte character could introduce position offsets leading to errors

Upgrade notes:

• It is recommended to disable the rsyslog service on DuetPi installations to prevent excessive growth of log files. To do this, run the following command in a Linux terminal: sudo systemctl stop rsyslog && sudo systemctl disable rsyslog
• There is a new SBC permission for webcam access. To allow DSF plugins to access the webcam(s), you must run sudo gpasswd -a dsf video once

New features:

• Added support for build times generated by REACTOR slicer
• Upgraded .NET framework to v6

Bug fixes:

• PrusaSlicer print requests were dropped due to incorrect content type (DWS expects text/plain but gets application/x-www-form-urlencoded)
• On some setups the periodic updater task locked the object model for 1.5s causing print artifacts due to slow SPI communication
• M999 from a macro file could hang with DuetPiManagementPlugin enabled
• Quoted characters were incorrectly treated in keyword arguments
• Multiple filament usages from a single-line comment were not properly parsed
• Error handling for file lists wasn't working as expected
• Only up to 9 axes could be configured
• Parameter letters were always converted to upper-case

New features:

• Number of glitches on the TransferReady pin are now recorded for diagnostics
• DCS uses proper return codes and saves the error reason on startup to /run/dsf/dcs.err
• DWS forwards the DCS start error to DWC if it is available

Changed behaviour:

• Plugin service notifies systemd about start after plugin manifests are loaded
• Default UNIX socket for DSF now points to /run/dsf/dcs.sock rather than to /var/run/dsf/dcs.sock (/var/run is usually symlinked to /run)
• Removed special heightmap code from DSF so that RRF can now read and write heightmap files on its own

Bug fixes:

• DCS could complain about plugin services if they terminated during shutdown
• systemd services for DuetPluginService did not wait for processes to start
• Some expression values like DateTime, ULong, and Null were not supported by DSF
• Web server took a few seconds to stop if a WebSocket client was connected
• Noise on the TfrRdy pin could make DCS get out of sync with RRF after updating the firmware (only in NoTerminateOnReset mode)
• DCS could send invalid collection values in patch mode
• DuetHttpClient did not reconnect under certain circumstances
• G-code filenames starting with digits (but not paths like 0:/gcodes/) could cause exceptions
• If the first or last G1 Z parameter were an expression, the file info may not be parsed

Changed behaviour:

• config-override.g is now written by RepRapFirmware
• Removed unused return command from API keywords
• Removed deprecated CodeResult class from API
• Added new -c parameter to ModelObserver to confirm receipt of data
• Added new Keyword code type to DSF API

Bug fixes:

• Automatic firmware update during unattended updates did not work
• Automatic expansion board updates did not wait for completion
• Fixed problem where subscribers received only cached model patches
• Under certain circumstances macro files could be stopped too early (thanks Andy)
• Pausing job files was not working if RRF reported no file position
• boards[].mcuTemp, boards[].v12, and boards[].vIn were not nullable
• Default firmware directory in the object model was wrong
• JSON responses in subscriber patch mode were not necessarily live
• M505 did not lock the movement before changing the sys directory
• Local variables were not deleted when their scope was released
• M105 did not output a NL at the end of Marlin-compatible replies

New features:

• Added HTTP password protection (M551) using new /machine/connect and /machine/disconnect endpoints
• Implemented new class library for remote management of Duets in standalone or SBC mode
• Added new HTTP endpoint /machine/noop to keep HTTP sessions alive on demand
• Added support for pausable macro files (see M98 R1)

Changed behaviour:

• Filament management is now done exclusively by RRF
• List of plugins to start on boot is only written when individual plugins are started or stopped

Bug fixes:

• Pausing near the very end of a job file did not work
• Single quotes in string parameters to convert letters to lower-case were not supported
• Keyword results were not properly logged (like from echo or abort)
• Under certain conditions messages in conditional blocks were not output instantly
• M997 did not accept the P-parameter to override a firmware filename
• Some log calls did not check for null messages

New features:

• Implemented file redirections of the echo command (see here)
• Added support for new InvalidateChannel command allowing plugins to cancel already queued codes and files

Bug fixes:

• Resolved race condition for M0/M1 which could cause stop.g to be executed instead of cancel.g
• Fixed an exception that could occur when codes were cancelled and their result was combined
• Under certain conditions paused prints could not be cancelled properly

New features:

• Plugin manager can now be used to reload specific plugin manifests
• Plugin manager may be used to query the installation/runtime status of plugins
• Added new cancelling item to state.status enum
• Subscribers and code stream clients can define what messages they want to receive
• Added support for array expressions
• DuetPiManagementPlugin now supports (un-)mounting of devices via M21/M22

Changed behaviour:

• Web server only sends messages with HTTP target to web clients

Bug fixes:

• When RRF reset, DCS could terminate when trying to clear the global variables
• Expression parameters were incorrectly serialized
• Certain UTF-8 strings could be truncated when sent to RRF
• Fixed race condition when attempting to save updated filament mapping
• GetFileInfo requests attempted to parse non-GCode files
• M-codes could have G-parameters, now only T-parameters are permitted
• Functions with more than one parameter were not working in echo commands

New features:

• RRF v3.4-b1 and newer can now read and write files on the SBC

Changed behaviour:

• Replies from macro files are output immediately as they are generated (like in standalone mode)
• Codes starting macros do not collect the results from the sub-macro codes any more (like in standalone mode)
• SPI link timing is not controlled by DCS any more, instead RRF does this (see also M576)

Bug fixes:

• Variable names could not contain underscores

Compatible versions:

• RepRapFirmware 3.3-b3
• DuetWebControl 3.3-b3

New features:

• Added support for variables in G-code files (global, var, set)

Changed behaviour:

• Added fallback to directories.system if firmware files cannot be found in directories.firmware

Bug fixes:

• Tilt factors for delta kinematics were off in config-override.g
• M0/M1 didn't cancel already queued file codes
• Truncated tool lists are now fetched using multiple queries

Compatible versions:

• RepRapFirmware 3.3-b2
• DuetWebControl 3.3-b2

Changed behaviour:

• Changed file format of the new plugin manifest
• Layers code is no longer compatible with previous versions
• Emulation is always applied to results from code interceptors
• The DSF-only keyword return is now obsolete and will be removed from a future version (unless support for it is added to RRF)

Bug fixes:

• Updated regular expressions for various slicer formats
• SBC permissions for third-party plugins were not properly enforced
• When DCS failed to start too many times in a row, it remained disabled
• DPS didn't (de-)serialize string dictionaries properly

Known issues:

• Variable support isn't implemented yet, this is TBD in 3.3-b3

Compatible versions:

• RepRapFirmware 3.3-b1
• DuetWebControl 3.3-b1

Changed behaviour:

• Plugin support in DSF is fully implemented
• DuetWebServer notifies systemd when it has started like DuetControlServer does
• M999 is only prioritized from text inputs if it is intended for the main board
• New configuration file dsf-config.g is automatically executed when DCS and third-party plugins have been started
• CodeConsole application uses Telnet G-code channel instead of SBC

Known issues:

• network.interfaces[].speed does not work for WiFi adapters on the Pi (see https://github.com/dotnet/runtime/issues/47777)

Compatible files:

• RepRapFirmware 3.2.0-b4
• DuetWebControl 3.2.0-b4

Changed behaviour:

• DCS service is now started via sysinit.target instead of basic.target so that config.g is processed faster on boot
• Thumbnails from PrusaSlicer are now parsed (thanks Sindarius)
• M500 writes new heater tuning parameters to config-override.g
• In Marlin emulation "ok" responses are only sent when the line is complete

Bug fixes:

• Codes could be sent to code interceptors in the wrong order
• M21 (P0) returned an error message breaking Octoprint support
• Under certain circumstances some object model keys were not updated on initialisation
• DCS service didn't have permission to change the datetime
• Print times with decimal places were incorrectly parsed
• When the controller was reset or updated, an extra data transfer was performed

Compatible files:

• RepRapFirmware 3.2.0-b3
• DuetWebControl 3.2.0-b3

Changed behaviour:

• DCS is now explicitly notified about closed messages and files (hence no longer compatible with 3.2-b2)
• CodeConsole utility allows evaluation of expressions using eval <expression>

Bug fixes:

• When certain G-code inputs were disabled, the DSF API threw NullReferenceExceptions
• When the heaters contained null items, no config-override.g could be writen
• When the move compensation type was set to none, the heightmap file was not reset
• Starting macro files could cause out-of-order execution and stack underruns
• Sometimes the object model wasn't fully updated after a disconnect

Compatible files:

• RepRapFirmware 3.2.0-b2
• DuetWebControl 3.2.0-b2

Changed behaviour:

• runonce.g is no longer processed before config.g to match RRF's behaviour
• Increased SPI protocol version due to slight changes for the new Linux task in RRF

Bug fixes:

• Added missing "Starting" item to the MachineStatus enumeration
• M112/M999 were executed out-of-order when read from files
• Sometimes in print files codes invoking macro files could crash DCS
• Aborted macro files did not cancel codes properly
• Comments following codes directly without a whitespace could cause parsing errors

Compatible files:

• RepRapFirmware 3.2.0-b1
• DuetWebControl 3.2.0-b1

Changed behaviour:

• Permissions are now required for DSF commands for executables running in /opt/dsf/plugins
• Simulation times are automatically written to G-code files
• Increased API level due to object model changes
• Renamed namespace DuetAPI.Machine to DuetAPI.ObjectModel and MachineModel to ObjectModel
• DSF processes are now running as their own dsf user

Bug fixes:

• DCS service file contained an invalid CPU priority
• Event logging via M929 was not working
• Macro files with an unknown start code were not properly cancelled by M99/M292 P1

Known issues:

• Security permissions are not enforced via AppArmor yet (and they are still subject to change)
• Package dependencies are not yet installed when a plugin is installed