@abandonware/noble/examples/advertisement-discovery.js

A Node.js BLE (Bluetooth Low Energy) central library.

const noble = require('../index');

noble.on('stateChange', function (state) {
  if (state === 'poweredOn') {
    noble.startScanning([], false);
  } else {
    noble.stopScanning();
  }
});

noble.on('discover', function (peripheral) {
  console.log(`${new Date()}`);
  console.log(
    `Peripheral discovered (${peripheral.id} with address <${peripheral.address}, ${peripheral.addressType}>, connectable: ${peripheral.connectable}, scannable: ${peripheral.scannable}, RSSI ${peripheral.rssi}:`
  );
  console.log('\thello my local name is:');
  console.log(`\t\t${peripheral.advertisement.localName}`);
  console.log(
    '\tcan I interest you in any of the following advertised services:'
  );
  console.log(`\t\t${JSON.stringify(peripheral.advertisement.serviceUuids)}`);
  const serviceData = peripheral.advertisement.serviceData;

  if (serviceData && serviceData.length) {
    console.log('\there is my service data:');
    for (const i in serviceData) {
      console.log(
        `\t\t${JSON.stringify(serviceData[i].uuid)}: ${JSON.stringify(
          serviceData[i].data.toString('hex')
        )}`
      );
    }
  }

  if (peripheral.advertisement.manufacturerData) {
    console.log('\there is my manufacturer data:');
    console.log(
      `\t\t${JSON.stringify(
        peripheral.advertisement.manufacturerData.toString('hex')
      )}`
    );
  }

  if (peripheral.advertisement.txPowerLevel !== undefined) {
    console.log('\tmy TX power level is:');
    console.log(`\t\t${peripheral.advertisement.txPowerLevel}`);
  }

  console.log();
});

process.on('SIGINT', function () {
  console.log('Caught interrupt signal');
  noble.stopScanning(() => process.exit());
});

process.on('SIGQUIT', function () {
  console.log('Caught interrupt signal');
  noble.stopScanning(() => process.exit());
});

process.on('SIGTERM', function () {
  console.log('Caught interrupt signal');
  noble.stopScanning(() => process.exit());
});