Switch Homebrew Starter + RomM Switch Client

Two things here:

• hello-switch/: minimal libnx sample to check your devkitPro setup.
• romm-switch-client/: SDL2/libnx RomM downloader (the one you want).

Toolchain (Windows / devkitPro MSYS)

1. Install devkitPro from https://devkitpro.org.
2. Open the "MSYS2 / MinGW 64-bit for devkitPro" shell.
3. Install/update packages:

   pacman -Syu
   pacman -S devkitA64 switch-dev switch-tools switch-curl
   

4. Verify:

   echo $DEVKITPRO              # expect /opt/devkitpro
   aarch64-none-elf-gcc --version
   ls $DEVKITPRO/libnx/switch_rules
   

If DEVKITPRO is empty, source /etc/profile.d/devkit-env.sh or restart the devkitPro shell. macOS/Linux: use the devkitPro pacman bootstrap, then install the same packages.

Build and run (hello-switch)

cd hello-switch
make clean   # optional
make         # build/hello-switch.nro
make run     # sends via nxlink if hbmenu netloader (Y) is active

Manual deploy: copy build/hello-switch.nro to sd:/switch/hello-switch/hello-switch.nro.

Build and run (romm-switch-client)

cd romm-switch-client
make clean && make        # produces romm-switch-client.nro
make run                  # nxlink to a Switch in netloader mode

Runtime config (.env)

Put .env at sdmc:/switch/romm_switch_client/.env (sample):

SERVER_URL=https://YOUR_ROMM_HOST:PORT     # http:// and https:// are supported
USERNAME=your_username
PASSWORD=your_password
DOWNLOAD_DIR=sdmc:/romm_cache               # base cache; platform/title_id subfolders are created
HTTP_TIMEOUT_SECONDS=30
FAT32_SAFE=true
LOG_LEVEL=info          # debug|info|warn|error
SPEED_TEST_URL=         # optional; URL to fetch ~40MB (Range) to estimate throughput; leave blank to skip

config.json is also read and currently overrides .env on the same keys (load order is .env then config.json). JSON supports schema_version (current 1), and legacy keys are migrated in-memory when possible.

Docs

• docs/config.md - config keys, defaults, SD paths.
• docs/controls.md - current controller mapping.
• docs/downloads.md - download pipeline, resume/retry rules, badges.
• docs/logging.md - logging behavior and levels.

Controls (current mapping)

• D-Pad: navigate lists
• B (bottom): Back
• A (right): Select / confirm
• Y (left): Queue view / add to queue
• X (top): Start downloads (from queue)
• D-Pad Left/Right (ROMS view): cycle filter/sort
• Minus (ROMS view): text search
• R (PLATFORMS view): open diagnostics
• R (DIAGNOSTICS view): refresh reachability probe
• Plus/Start: Quit Mappings are fixed in source/input.cpp (positional codes); UI hints match.

Queue / status behavior

• Badges per ROM: hollow (not queued), grey (queued), white (downloading), green (completed on disk), orange (resumable), red (failed).
• Footer shows status text for the selected ROM.
• Completed detection checks final output on disk under <download_dir>/<platform>/<title_id>/... (flat fallbacks supported).
• No duplicate enqueue per session; failed/incomplete items can be retried, completed are blocked. Resumable items show as orange and can be retried manually; they are not auto-queued.
• Temp manifests load into history as Resumable ("Resume available") and do not auto-queue; 404/tiny preflight triggers one metadata refresh, then fails fast.

Current client features

• SDL2 UI (1280x720): platforms -> ROMs -> detail, queue, downloading, diagnostics, error.
• RomM API: lists platforms/ROMs, fetches per-ROM files[]; bundles respect relative paths; per-ROM folder naming title_id.
• ROM list tooling: revision-keyed in-memory index for search/filter/sort without full per-frame scans.
• Diagnostics screen: config summary, server reachability probe, SD free space, queue/history stats, last error, and exportable log summary.
• Downloads: FAT32/DBI splits when enabled, Range resume with contiguity enforcement, temp isolation under <download_dir>/temp/<platform>/<rom>/<file>/..., archive bit set for multi-part.
• Networking: HTTP and HTTPS via libcurl. Redirects are not followed (Location logged).
• Logging: leveled (LOG_LEVEL); debug is noisy.
• Font: HD44780 bitmap font from romfs/HD44780_font.txt with macron glyph.

Repo layout

• hello-switch/ - minimal libnx sample.
• romm-switch-client/ - full client sources (SDL, downloader, config, logging, docs in docs/).
• .gitignore - shared ignores.

Tests (host)

• Location: tests/
• Build/run (host C++17 compiler + make, not devkitPro):

  cd tests
  make                 # uses host g++/make; run from MSYS2 MinGW64 on Windows
  ./romm_tests         # Catch2 runner; use -s or --list-tests for detail
  

Tests cover URL parsing for HTTP/HTTPS (including default ports) and strict chunked decoding (valid/malformed, extensions, missing CRLF). No Switch libs needed.

• Windows (MSYS2/MinGW64): install host tools if missing:

  pacman -S gcc make
  

Use the MSYS2 MinGW64 shell (not PowerShell/MSYS). Override compiler if needed: CXX=/usr/bin/g++ make.

Troubleshooting

• switch_rules missing or link errors: ensure DEVKITPRO is set and packages are current (pacman -Syu devkitA64 switch-dev switch-tools).
• make run fails: install switch-tools (nxlink), ensure hbmenu netloader is active and the Switch is reachable on LAN.
• Logging empty: check LOG_LEVEL in .env and that sdmc:/switch/romm_switch_client/ exists and is writable.