File Transfer & Web Server

Upload and organize books on the device's SD card from a browser on your computer or phone.

Open File Transfer

On the home screen, choose File Transfer (파일 전송). A screen with the connection modes opens.

Home
Home
Choose a mode
Choose a mode홈 → 파일 전송

Four modes

Join a NetworkJoin your home or office Wi-Fi and start the web server.Create HotspotThe device opens its own Wi-Fi. For when there is no router.Calibre WirelessSend books from Calibre on your computer.USB DriveX4 Pro · X4 Classic · Paper MonoUse the SD card as an external drive on your computer.

Settings → System → Wi-Fi Networks only saves networks. The web server runs only from File Transfer.

USB Drive appears only on the X4 Pro, X4 Classic and Paper Mono. The screen above is an X3, so it shows three modes.

Join a Network

  1. 1
    Choose Join a Network (네트워크 연결) and the device scans for Wi-Fi.
  2. 2
    Move through the list with the side buttons and press Connect (연결). On touch devices, tap a network. * marks a password-protected network, + a saved one. Add a network that is not listed with Add hidden network...; Retry (재시도) scans again.
  3. 3
    Enter the password with the on-screen keyboard if needed. Networks you have joined connect right away next time.
  4. 4
    Once connected, the screen shows an address and a QR code. Open the address in a browser on a computer or phone on the same Wi-Fi, or scan the QR code.
Choose Wi-Fi
Choose Wi-Fi파일 전송 → 네트워크 연결
Web server running
Web server running

If http://crosspoint.local/ does not open (some Android phones), use the IP address.

Create Hotspot

  1. 1
    Choose Create Hotspot (핫스팟 만들기) and the device opens a Wi-Fi network named CrossPoint-Reader. It has no password.
  2. 2
    Join that network from your phone or computer. Scanning the top QR code joins it directly.
  3. 3
    Open http://crosspoint.local/ or http://192.168.4.1/ in a browser, or scan the bottom QR code.

While joined to the hotspot, your phone or computer may have no internet access.

Hotspot screen
Hotspot screen파일 전송 → 핫스팟 만들기

Calibre Wireless

  1. 1
    Install the CrossPoint Reader plugin in Calibre on your computer. See the Files & Calibre guide for how.
  2. 2
    On the device, choose Calibre Wireless (Calibre 무선 연결) and pick a Wi-Fi network. It must be the same network as the computer.
  3. 3
    In Calibre, select books and use Send to device. Leave the device on this screen while it transfers.
Waiting for Calibre
Waiting for Calibre파일 전송 → Calibre 무선 연결

USB Drive

X4 Pro · X4 Classic · Paper Mono
  1. 1
    Connect the device to your computer with a USB cable and choose USB Drive (USB 드라이브).
  2. 2
    The SD card shows up on the computer as an external drive. Copy and delete files as usual.
  3. 3
    Eject the drive on the computer or unplug the cable, and the device returns to the home screen.

What the web interface does

The page has Home, File Manager and Settings at the top.

Home

Device status: serial number, firmware version, Wi-Fi status, IP address and free memory.

Settings

Change every device setting from the browser, including values the device screen does not show: OPDS download folder and file name format, frontlight brightness and color temperature, KOReader account, and clock details.

Saved Wi-Fi networks and OPDS servers are added and removed here too.

File Manager

  • Upload: upload several files at once, or drag them onto the window. Files that fail can be sent again with Retry.
  • Optimize EPUB: before uploading, the browser shrinks the images inside an EPUB to fit the device screen.
  • New Folder: create a folder.
  • Each file can be renamed, moved to another folder or downloaded. Click an image file to preview it.
  • Delete with the trash icon, or select several items and use Delete Selected. A folder must be empty to be deleted, and deleted files cannot be recovered.

Upload fonts (.epdfont) with the File Manager into the /fonts folder. See the Korean fonts page.

WebDAV

While the web server runs, WebDAV clients such as the macOS Finder, Windows File Explorer or Cyberduck can mount the same address as a network drive.

For developers: ports and API

The HTTP API behind the web interface can be called directly.

Ports

80HTTPWeb interface, API, WebDAV
81WebSocketWebSocket upload
8134UDPDiscovery. Replies to hello
crosspoint.localmDNSmDNS host name (no service record)

Endpoints

GET/api/statusDevice status
GET/api/filesFolder listing (?path=)
GET/downloadDownload a file (?path=)
POST/uploadMultipart upload (?path=)
POST/mkdirCreate a folder
POST/renameRename
POST/moveMove
POST/deleteDelete
GET POST/api/settingsRead and write settings
GET POST/api/wifiList and add saved Wi-Fi (delete with /api/wifi/delete)
GET POST/api/opdsList and add OPDS servers (delete with /api/opds/delete)

There is no authentication. Range requests and resuming are not supported, and an interrupted upload deletes the partial file.

Troubleshooting

The page does not open

  • Make sure your phone or computer is on the same Wi-Fi as the device. For the hotspot, it must be joined to CrossPoint-Reader.
  • The address starts with http://, not https.
  • If crosspoint.local does not work, use the IP address on the screen.
  • Turn off VPNs, and avoid guest Wi-Fi that blocks devices from talking to each other.

Uploads fail or stop

  • Stay close to the router and keep the device on this screen.
  • Check the free space on the SD card.
  • Send failed files again with Retry. An interrupted file is deleted, so it uploads from the start.

Security

  • The web server has no authentication. Anyone on the same network can see and delete files.
  • Use it only on networks you trust, such as your home network.
  • Press Exit (나가기) on the File Transfer screen to turn off the web server and Wi-Fi.