Rtljs NPM | npm.io

RTLjs

Node.js interface for librtlsdr, using FFI-NAPI

Works with modern versions of node (v14-16 etc.), unlike alternate packages on NPM

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

Installation

Prerequisites

This module requires librtlsdr. This package in turn requires libusb.

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. 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:

import * as rtljs from "rtljs";

Node require():

const rtljs = require("rtljs");

Sample Usage:

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);