@ledgerhq/hw-transport
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@ledgerhq/hw-transport implements the generic interface of a Ledger Hardware Wallet transport.
Type: {unsubscribe: function (): void}
unsubscribe function (): voidType: any
A "descriptor" is a parameter that is specific to the implementation, and can be an ID, file path, or URL. type: add or remove event descriptor: a parameter that can be passed to open(descriptor) deviceModel: device info on the model (is it a nano s, nano x, ...) device: transport specific device info
Observer generic type, following the Observer pattern
Type: Readonly<{next: function (event: EventType): any, error: function (e: EventError): any, complete: function (): any}>
The Transport class defines a generic interface for communicating with a Ledger hardware wallet. There are different kind of transports based on the technology (channels like U2F, HID, Bluetooth, Webusb) and environment (Node, Web,...). It is an abstract class that needs to be implemented.
Send data to the device using a low level API. It's recommended to use the "send" method for a higher level API.
Returns Promise<Buffer> A promise that resolves with the response data from the device.
Send apdus in batch to the device using a low level API. The default implementation is to call exchange for each apdu.
apdus Array<Buffer> array of apdus to send.observer Observer<Buffer> an observer that will receive the response of each apdu.Returns Subscription A Subscription object on which you can call ".unsubscribe()" to stop sending apdus.
Set the "scramble key" for the next data exchanges with the device. Each app can have a different scramble key and it is set internally during instantiation.
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Close the connection with the device.
Returns Promise<void> A promise that resolves when the transport is closed.
Listen for an event on the transport instance. Transport implementations may have specific events. Common events include: "disconnect" : triggered when the transport is disconnected.
Returns void
Stop listening to an event on an instance of transport.
Returns void
Enable or not logs of the binary exchange
Set a timeout (in milliseconds) for the exchange call. Only some transport might implement it. (e.g. U2F)
exchangeTimeout numberReturns void
Define the delay before emitting "unresponsive" on an exchange that does not respond
unresponsiveTimeout numberReturns void
Send data to the device using the higher level API.
cla number The instruction class for the command.ins number The instruction code for the command.p1 number The first parameter for the instruction.p2 number The second parameter for the instruction.data Buffer The data to be sent. Defaults to an empty buffer. (optional, default Buffer.alloc(0))statusList Array<number> A list of acceptable status codes for the response. Defaults to [StatusCodes.OK]. (optional, default [StatusCodes.OK])Returns Promise<Buffer> A promise that resolves with the response data from the device.
Check if the transport is supported on the current platform/browser.
Type: function (): Promise<boolean>
Returns Promise<boolean> A promise that resolves with a boolean indicating support.
List all available descriptors for the transport.
For a better granularity, checkout listen().
Type: function (): Promise<Array<any>>
TransportFoo.list().then(descriptors => ...)
Returns Promise<Array<any>> A promise that resolves with an array of descriptors.
Listen for device events for the transport. The method takes an observer of DescriptorEvent and returns a Subscription. A DescriptorEvent is an object containing a "descriptor" and a "type" field. The "type" field can be "add" or "remove", and the "descriptor" field can be passed to the "open" method. The "listen" method will first emit all currently connected devices and then will emit events as they occur, such as when a USB device is plugged in or a Bluetooth device becomes discoverable.
Type: function (observer: Observer<DescriptorEvent<any>>): Subscription
observer Observer<DescriptorEvent<any>> An object with "next", "error", and "complete" functions, following the observer pattern.const sub = TransportFoo.listen({
next: e => {
if (e.type==="add") {
sub.unsubscribe();
const transport = await TransportFoo.open(e.descriptor);
...
}
},
error: error => {},
complete: () => {}
})
Returns Subscription A Subscription object on which you can call ".unsubscribe()" to stop listening to descriptors.
Attempt to create a Transport instance with a specific descriptor.
Type: function (descriptor: any, timeout: number): Promise<Transport>
descriptor any The descriptor to open the transport with.timeout number An optional timeout for the transport connection.TransportFoo.open(descriptor).then(transport => ...)
Returns Promise<Transport> A promise that resolves with a Transport instance.
create() allows to open the first descriptor available or throw if there is none or if timeout is reached. This is a light helper, alternative to using listen() and open() (that you may need for any more advanced usecase)
openTimeout (optional, default 3000)listenTimeout number?TransportFoo.create().then(transport => ...)
FAQs
Ledger Hardware Wallet common interface of the communication layer
The npm package @ledgerhq/hw-transport receives a total of 94,096 weekly downloads. As such, @ledgerhq/hw-transport popularity was classified as popular.
We found that @ledgerhq/hw-transport demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 7 open source maintainers collaborating on the project.
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