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thegecko / webusb

Node.js implementation of the WebUSB Specification
https://thegecko.github.io/webusb/
MIT License
183 stars 27 forks source link

Declaring a list of devices to watch #73

Closed thibault-gaillard-sauermann closed 3 years ago

thibault-gaillard-sauermann commented 3 years ago

Hi,

Is there a way to pre-declare a list of device to listen for connection/disconnection ?

When requesting device, if it is not plugged yet, it will fail, but i'd like to be able to watch for connection/disconnection on this device. But, as the device is not in "allowedDevices" list, I will ne be notified when it is plugged.

Is this possible ?

thegecko commented 3 years ago

The webusb spec. doesn't allow for this (the user has to explicitly request a device is added).

You can fake it in the the node version by using a library like node-usb or usb-detection to fire on device connections and then create a webusb version of that device.

I can give you some pointers, but this would never work in the browser.

thibault-gaillard-sauermann commented 3 years ago

I can use usb library in addition for these events, my runtime is on Electron. And I prefer a more modern standard like your implementation of webusb.

So, you confirm that I will not be able to listen to a specific device connection with webusb if haven't made a successful requestDevice before ?

thegecko commented 3 years ago

So, you confirm that I will not be able to listen to a specific device connection with webusb if haven't made a successful requestDevice before ?

Correct, I don't want to add things which wouldn't work in the browser.

In Electron you could potentially use node-usb to detect your device and then create a webusb object from it similar to:

https://github.com/thegecko/webusb/blob/0a3f33156129f9e042ede361aab69164b0a00588/src/adapter.ts#L452

thibault-gaillard-sauermann commented 3 years ago

OK, I'll user another lib to handle connection/disconnection events.

Thank you for your answers !