// k-rosspointSender LIVE

k-rosspointSender takes a web article, a Wikipedia page, pasted text, or a whole pack of linked Wikipedia articles, cleans it down to the reading, builds an EPUB tuned for a small e-ink screen, and sends it straight to a CrossPoint reader over Wi-Fi. No account, no backend, nothing leaves your machine except the article fetch and the transfer to your reader.

I bought an Xteink X4 Pro — a $99 pocket e-ink reader the size of a phone — and put the open CrossPoint firmware on it. It's a lovely little thing to read on. The gap is getting reading onto it: the stock path is Calibre or dragging files over USB, and neither is how I actually find things to read, which is "open tab, think I'd read that on the couch, close tab, forget." This closes that gap. Paste the URL, press send, pick up the reader.

## // TWO APPS, ONE DESIGN //

Open the web app → — runs in the browser as a static page. Paste HTML or text, drop a file, fetch a URL where the site allows it, or use the bookmarklet where it doesn't. Wikipedia goes through the MediaWiki API, so it always works. Everything is cached in your browser, nothing is sent to this site.

Desktop app (Windows, portable, below) — the same pipeline as a native SDL2 + Dear ImGui app, with the browser's limits gone: it fetches any URL, finds the reader on the LAN by itself, sends over Wi-Fi without the HTTPS-to-local-device block, and acts as a local helper for the web app so the hosted version can send through it. Drop a link on the window and it starts.

Browsers block a page served over HTTPS from talking to a device on http://192.168.x.x. That's by design, but there's a clean way around it: the web app is one file, so press Save an offline copy (or grab the download below) and open it from your disk. A page opened from disk isn't HTTPS, and the Wi-Fi send just works — Chrome, Edge and Firefox. Failing that: download the EPUB, write it to the reader's USB folder, or let the desktop app do the sending.

## // WHAT IT DOES //

Cleanup. Readability-style extraction. Ads, navigation, cookie banners, comments, related-article junk, scripts and trackers go. Title, author, date, source URL, headings, paragraphs, images, captions, code and simple tables stay. Everything is sanitized against an allowlist before it becomes a book.

Wikipedia mode. Infoboxes, navboxes, edit links, hatnotes and the reference sections are stripped by default; keep the infobox or the references with a toggle. The result reads like a chapter, not a web page.

EPUB for e-ink. A title page, a table of contents, the cleaned body, a source note, and metadata. Images come out as grayscale baseline JPEG at 480 px — the only thing CrossPoint's renderer will draw. Four presets (Compact, Comfortable, Large Text, Reference) and the usual knobs. Every generated file passes epubcheck.

Spider packs. Start from one Wikipedia article, scan the pages it links to, tick the ones you want, and get one EPUB. Links between bundled pages work inside the book; links to pages you didn't take stay online and get a small arrow. Each pack carries an index, an external-links page, a missing-articles page, and an attribution page with every source URL. It's a tiny offline wiki on a subject — Steam engine plus boilers, pistons and Watt in a 300 KB file.

Sending. CrossPoint's documented API, all of it: multipart HTTP upload (default), WebDAV, and the WebSocket upload with progress. Folder browser for the card. A test-connection step, a test EPUB, and status that never fails silently. USB folder write and plain download for everything else. A mock Bluetooth transport sits there with a protocol draft, waiting for a firmware that speaks it.

Library. Every converted article and pack is kept with its transfer history, so you can re-export or re-send without fetching again, or bundle several articles into one book so the reader isn't littered with ten tiny files.

## // GET IT //

The web app is at k-engine.org/sender/; there's also a single-file copy below you can save and open offline. The desktop build is portable: unzip and run krosspoint_sender.exe, keep the DLLs next to it. It has a command line too — --convert, --pack, --send, --discover — for scripts and cron jobs. Source for both is on GitHub under the MIT license.