What's Changed

• Add static_cast to ambiguous serialize call in FpySequencer by @ethancheez in https://github.com/nasa/fprime/pull/4008
• FpySequencer stack based architecture by @zimri-leisher in https://github.com/nasa/fprime/pull/3975
• Fix AI Policy link in PR template by @thomas-bc in https://github.com/nasa/fprime/pull/4019
• Remove notice by @LeStarch in https://github.com/nasa/fprime/pull/4045
• Format FppTest by @bocchino in https://github.com/nasa/fprime/pull/4048
• Update Drv IP stack to use FwSizeType instead of U32 by @thomas-bc in https://github.com/nasa/fprime/pull/4013
• Basic data structure library, phase 1 by @bocchino in https://github.com/nasa/fprime/pull/3927
• FpySequencer arithmetic by @zimri-leisher in https://github.com/nasa/fprime/pull/4025
• Update supported platforms by @kevin-f-ortega in https://github.com/nasa/fprime/pull/4071
• Add ground derived channels how-to guide by @LeStarch in https://github.com/nasa/fprime/pull/4074
• Add venv requirements for running framework tests by @pjromano in https://github.com/nasa/fprime/pull/4078
• Add logic for assert failure short circuiting in AssertFatalAdapter by @kyleajones in https://github.com/nasa/fprime/pull/4042
• Add subtopology documentation by @thomas-bc in https://github.com/nasa/fprime/pull/4072
• Add event ID filters to text logger components by @ianbrault in https://github.com/nasa/fprime/pull/4028
• Bump GDS to v4.0.2a3 by @LeStarch in https://github.com/nasa/fprime/pull/4079
• Allow FPP arrays of arbitrary size by @bocchino in https://github.com/nasa/fprime/pull/4073
• Update project structure in cookiecutters CI by @LeStarch in https://github.com/nasa/fprime/pull/3991
• Update troubleshooting guide by @LeStarch in https://github.com/nasa/fprime/pull/4086
• Add test driven development how-to by @LeStarch in https://github.com/nasa/fprime/pull/4090
• Add reusable InT test scripts by @chuynh4duarte in https://github.com/nasa/fprime/pull/3923
• Modify LinuxTimer interface for consistency by @LeStarch in https://github.com/nasa/fprime/pull/4087
• FpySequencer U32 stack size + some error telemetry by @zimri-leisher in https://github.com/nasa/fprime/pull/4065
• Add Framing subtopologies and use them within Com subtopologies by @thomas-bc in https://github.com/nasa/fprime/pull/4113
• Incorporate student feedback for ground derived channels by @LeStarch in https://github.com/nasa/fprime/pull/4117
• Update fprime-gds version to 4.0.2a4 by @LeStarch in https://github.com/nasa/fprime/pull/4118
• Revise subtopology development documentation by @LeStarch in https://github.com/nasa/fprime/pull/4119
• Create SDD for ComCcsds subtopology by @LeStarch in https://github.com/nasa/fprime/pull/4128
• Create SDD for CdhCore subtopology by @LeStarch in https://github.com/nasa/fprime/pull/4121
• Feedback updates on common port patters, health, and worker by @LeStarch in https://github.com/nasa/fprime/pull/4115
• Add Software Design Document for FileHandling subtopology by @LeStarch in https://github.com/nasa/fprime/pull/4125
• Add FPP state machine How-To by @LeStarch in https://github.com/nasa/fprime/pull/4096
• Add Software Design Document for ComFprime subtopology by @LeStarch in https://github.com/nasa/fprime/pull/4127
• Enhancement: Added file size and subdirectory support to FileManager directory listing feature by @Isaac-G5900 in https://github.com/nasa/fprime/pull/4041
• Revise Communication Adapter Interface documentation by @LeStarch in https://github.com/nasa/fprime/pull/4133
• Add Active Phaser to Svc by @lsk567 in https://github.com/nasa/fprime/pull/3974
• Format all top-level source folders by @thomas-bc in https://github.com/nasa/fprime/pull/4134
• Fix test logic for TcDeframer CRC check by @thomas-bc in https://github.com/nasa/fprime/pull/4138
• Fixing LinuxSpiDriver issues; Adding function argument check and completing read-after-write checks by @vincewoo in https://github.com/nasa/fprime/pull/4137
• Revise install instructions with latest project structure by @thomas-bc in https://github.com/nasa/fprime/pull/4139
• Add SDD documentation for LinuxUartDriver component by @Copilot in https://github.com/nasa/fprime/pull/4124
• Bump requirements ahead of v4.0.1a1 by @thomas-bc in https://github.com/nasa/fprime/pull/4142

New Contributors

• @pjromano made their first contribution in https://github.com/nasa/fprime/pull/4078
• @Isaac-G5900 made their first contribution in https://github.com/nasa/fprime/pull/4041
• @lsk567 made their first contribution in https://github.com/nasa/fprime/pull/3974
• @Copilot made their first contribution in https://github.com/nasa/fprime/pull/4124

Full Changelog: https://github.com/nasa/fprime/compare/v4.0.0...v4.0.1a1