v4.27

A fast plotter again, a proper Files page, and a Start button that's safe on FOC firmware. Most of this came from community testing on the forum: thanks, sperate.

Try it first: the live demo runs this exact UI on a simulated inverter, in your browser.

Plotter: fast again over UART

• Over UART with up to 10 values, each read is now the inverter's own stream <Burst> <names> command (libopeninv, so stm32-sine and ZombieVerter alike): Burst rows sampled back-to-back and returned in one reply. 100 rows of 3 values take about 60 ms, where get with repeat took about 1.2 s for 100 samples of one value. It's a scope view for fast signals like angle, id and iq.
• Over CAN (the ESP answers get via SDO), or with more than 10 values, it keeps get with repeat.
• Burst (Plot → Edit Layout) is samples per read: up to 500 rows over UART, capped at 2,500 values a batch so the ESP doesn't run short of RAM. A batch is a burst of back-to-back samples, so slow signals plot as flat steps at a high Burst. The default for new layouts is 10.

Start inverter: asks first, and works on FOC

• Start inverter in manual mode now asks for confirmation.
• On FOC firmware, which has no start command ("Not implemented in FOC variant"), it falls back to the manualstart parameter, which starts the inverter in Run.
• manualstart can't be left armed. It latches until every interlock passes (no throttle, brake seen, emcystop/mprot, udcsw ≤ udc < udclim). Left set while one blocks, the inverter would start by itself once that clears, so:
  • if it hasn't started within about 3 s, the button clears it again and shows the status flags that held it back;
  • a page closed, reloaded or switched away while a start is pending sends one last clear on its way out;
  • a clear the device doesn't answer (say, inverter EMI on the Wi-Fi) is retried, and if it still fails an alert says manualstart may still be armed;
  • Stop always clears manualstart, whoever set it.

Files page

• Download beside Delete.
• Delete asks for confirmation, and says why when it's refused (with sign-in on, the web interface's own files need an admin) instead of silently doing nothing.
• Files are grouped into Your files and System files. System files are marked Original, Modified (a different size from what the build shipped, e.g. after you uploaded a replacement) or Missing. The build now writes fs-manifest.json (the shipped files and their sizes) into the filesystem image.
• A tighter list, with sizes.
• Fixed: a file in a folder (e.g. fonts/) couldn't be deleted. The firmware listed only its base name; /list now gives full paths and sizes.

Fixes and polish

• Spot values on phones: the Name column no longer changes width as you scroll the list. The multi-column layout measured from the list's position on screen, which moves as a phone scrolls, so it flipped part-way down.
• App mode: the manifest asks for standalone display (full screen from the home screen, where the browser allows it over plain http).
• Dark theme dropdowns are readable: Chrome drew them with a light palette (white group headings, a pale highlight behind light text).
• Fonts ship with their licence beside them (fonts/OFL.txt), and the font notices are corrected.
• Removed the unused logo.png (22.7 KB of filesystem).

Updating

Use the Update page as usual: device settings and accounts are kept by the ESP, and your layouts and images are restored by the browser after the reboot (with sign-in on, sign back in as an operator or admin).

For contributors

• E2E suite at 296 tests, including the stream and get plot paths, the FOC start fallback and its latch safety, and the Files page.
• The mock ESP can act as the FOC build (/__test/foc, optionally with a blocking interlock).

Full Changelog: v4.26...v4.27