PDF Print server for reMarkable tablet

Send PDF documents to your reMarkable tablet by printing over network. Inspired by Evidlo/remarkable_printer, this code is just reimplementation of Evidlo/remarkable_printer in C/C++ to keep tablet resources as low as possible.

Build

To build server from source, you need toolchain from remarkable.engeneering installed.

For example, you can download and install to your home directory:

wget https://remarkable.engineering/oecore-x86_64-cortexa9hf-neon-toolchain-zero-gravitas-1.8-23.9.2019.sh
chmod +x oecore-x86_64-cortexa9hf-neon-toolchain-zero-gravitas-1.8-23.9.2019.sh
./oecore-x86_64-cortexa9hf-neon-toolchain-zero-gravitas-1.8-23.9.2019.sh -d ~/rmtoolchain

And to use it (assuming you are in this repository cloned directory):

source ~/rmtoolchain/environment-setup-cortexa9hf-neon-oe-linux-gnueabi
make

The command above should set CXX variable to the toolchain compiler with arm architecture settings. You can now use the binary in the tablet (after copying to it).

Local build

For easier development you can omit toolchain setup and just use make command to build the server for your own architecture (assuming linux). Beside c++ compiler it is necessary to have uuid-dev library installed (deb package on debian/ubuntu). Keep in mind that resulting binary cannot be used in the reMarkable device.

Installation

You need the ssh access to your device. Transfer service and binary to your device, like:

ssh root@remarkable mkdir ./bin
scp pdf-print-server root@remarkable:./bin
scp pdf-print-server.service root@remarkable:/etc/systemd/system

Then run commands in your remarkable ssh shell:

systemctl daemon-reload
systemctl enable pdf-print-server.service
systemctl start pdf-print-server.service

That's it. Now you can see the server is listening on the specified port, by running netstat -lt on the remarkable shell.

Printer setup

Just add a Network Printer/AppSocket/HP JetDirect, fill in IP address of your reMarkable tablet. As a driver, choose Generic/PDF.

Evidlo/remarkable_printer already have documented printer settings by OS.

Security

• Please keep in mind, that there is no authentication nor encryption involved. Use only in your own network.
• Server is currently running as root (as everything else in the rM tablet), so it has full access to your tablet!
• Use at own risk.