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node.js interface for librtl-sdr, via FFI

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# RTLjs
Node.js interface for librtlsdr, using FFI-NAPI

Works with modern versions of node, unlike alternate packages on NPM

Only tested on Linux, but if you ask me, I (think I) can very easily add windows/macos support.

## Installation
### Prerequisites
This module requires [librtlsdr](https://github.com/steve-m/librtlsdr). This package in turn requires [libusb](https://libusb.info/).

Librtlsdr is a package on most package repositories.

#### Linux:
```sudo apt-get install librtlsdr-dev```

#### Windows:
you will need to install librtlsdr on your machine. [DLLs are availble on the librtlsdr wiki](https://osmocom.org/projects/rtl-sdr/wiki). These will need to be inserted into a system path folder so that ffi-napi can access them.

### Package
```npm i rtljs```

## Usage
The package is written in ts and compiled to js, so ts typings are automatically provided with the package.

Using ES:
```js
import * as rtljs from "rtljs";
```

Node require():
```js
const rtljs = require("rtljs");
```

Sample Usage:
```js
console.log(rtljs.getDeviceCount()); // 1
console.log(rtljs.getDeviceName(0)); // Generic RTL R820T2

let device = rtljs.open(0);
device.setCenterFreq(1090 * rtljs.mhz); // 1090000000

// raw IQ data
device.resetBuffer(); // reset buffer to prevent communication data from appearing as radio data
let data = device.readSync(512); // read 512b
console.log(JSON.stringify(data)); // [128, 127, 128... etc

rtljs.close(device);
```

## Common Fixes
### Nothing happening when i use readSync/Async, program just hangs
remember to use device.resetBuffer() before using read commands
### Can't access device
you probably forgot to use close() in your code to end the device when the program ended. Reset your usb ports and this should now work fine.

## API
TSDoc API available at [https://arkanic.github.io/rtljs/](https://arkanic.github.io/rtljs/)

[Examples are available here](https://github.com/Arkanic/rtljs/tree/main/example)

## Broken Stuff
`readAsync` is not currently implemented with the FFI library change, this is in progress.

## About
Made by [Arkanic](https://github.com/Arkanic)

MIT License

rtljs

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