libdivecomputerjs

This project is a wrapper for libdivecomputer and enables you to use libdivecomputer with nodeJS.

This project tries to stay as close to the original project regarding the calling patterns and naming with some exceptions.

As an example see test/download-eonsteel.ts as a reference.

Dependencies

• cmake
• autoconf
• build-essentials
• pkg-config
• libusb
• libhidapi
• BlueZ

For ubuntu run sudo apt install libusb-1.0-0 libhidapi-libusb0 libbluetooth3 build-essentials autoconf pkg-config cmake

Installation

Run yarn install

run yarn test to check if it works

Deviations from the original project

• I used class for all major parts of the project instead of functions operating on objects. For instance Parser has all functionality of dc_parser_t and USBHIDTransport for dc_usbhid_device_t
• All device types in libdivecomputer are renamed to transports. Eg. dc_usbhid_device_t is named USBHIDTransport to prevent confusion with the Device class, wrapping dc_device_t.
• All iterate functions are static methods off the class it iterates. Eg Descriptor.iterate for dc_descriptor_iterator
• Parser.getDatetime returns a string instead of a datetime. As of writing Napi::Date doesn't have a way to set the timezone. This I needed to return a custom object, or format. I settled on returning an ISO date time, I think it is the easiest format to parse in JavaScript or other languages.

Common problems

Linux: The library compiles and tests work, but for my USB based device the new Device fails.

For linux you need to define how and who can access newly plugged in devices. You can put this file in /etc/udev/rules.d/ . Ensure your user is part of the plugdev group (and ensure it exists). After a re-login to ensure your user groups are reloaded, and after you re plugin the device. it should work fine.

Linux: It keeps throwing UNSUPPORTED errors for USB or bluetooth.

Chances are libdivecomputer compiled without the required libraries. Ensure you can run the following commando's

• pkg-config --exists --print-errors libusb-1.0 && echo 'LIBUSB found'
• pkg-config --exists --print-errors bluez && echo 'BlueZ found'

if both echo that they found the lib, great, if not, ensure you have libusb-1.0-0 and libbluetooth3 installed, allong with all the build tools like build-essentials autoconf pkg-config cmake. if it found them. conpile again yarn clean and yarn build