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noble

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

noble

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

Want to implement a peripheral? Checkout bleno

Note: Mac OS X, Linux and Windows are currently the only supported OSes. Other platforms may be developed later on.

  • Kernel version 3.6 or above
  • libbluetooth-dev
sudo apt-get install bluetooth bluez libbluetooth-dev libudev-dev

Make sure node is on your path, if it's not, some options:

sudo yum install bluez bluez-libs bluez-libs-devel

See Configure Intel Edison for Bluetooth LE (Smart) Development

See @don's set up guide on Bluetooth LE with Node.js and Noble on Windows.

This limit is imposed upon by the Bluetooth adapter hardware as well as it's firmware.

Platform
OS X 10.11 (El Capitan) 6
Linux/Windows - Adapter dependent
5 (CSR based adapter)
npm install noble
var noble = require('noble');
noble.startScanning(); // any service UUID, no duplicates 
 
 
noble.startScanning([], true); // any service UUID, allow duplicates 
 
 
var serviceUUIDs = ["<service UUID 1>", ...]; // default: [] => all 
var allowDuplicates = <false|true>; // default: false 
 
noble.startScanning(serviceUUIDs, allowDuplicates[, callback(error)]); // particular UUID's 

NOTE: noble.state must be poweredOn before scanning is started. noble.on('stateChange', callback(state)); can be used register for state change events.

noble.stopScanning();
peripheral.connect([callback(error)]);
peripheral.disconnect([callback(error)]);
peripheral.updateRssi([callback(error, rssi)]);
peripheral.discoverServices(); // any service UUID 
 
var serviceUUIDs = ["<service UUID 1>", ...];
peripheral.discoverServices(serviceUUIDs[, callback(error, services)]); // particular UUID's 
peripheral.discoverAllServicesAndCharacteristics([callback(error, services, characteristics));
var serviceUUIDs = ["<service UUID 1>", ...];
var characteristicUUIDs = ["<characteristic UUID 1>", ...];
peripheral.discoverSomeServicesAndCharacteristics(serviceUUIDs, characteristicUUIDs, [callback(error, services, characteristics));
service.discoverIncludedServices(); // any service UUID 
 
var serviceUUIDs = ["<service UUID 1>", ...];
service.discoverIncludedServices(serviceUUIDs[, callback(error, includedServiceUuids)]); // particular UUID's 
service.discoverCharacteristics() // any characteristic UUID 
 
var characteristicUUIDs = ["<characteristic UUID 1>", ...];
service.discoverCharacteristics(characteristicUUIDs[, callback(error, characteristics)]); // particular UUID's 
characteristic.read([callback(error, data)]);
characteristic.write(data, withoutResponse[, callback(error)]); // data is a buffer, withoutResponse is true|false 
  • withoutResponse:
    • false: send a write request, used with "write" characteristic property
    • true: send a write command, used with "write without response" characteristic property
characteristic.broadcast(broadcast[, callback(error)]); // broadcast is true|false 
characteristic.notify(notify[, callback(error)]); // notify is true|false 
  • allows notification to trigger 'data' event
  • use for characteristics with notify or indicate properties
characteristic.discoverDescriptors([callback(error, descriptors)]);
descriptor.readValue([callback(error, data)]);
descriptor.writeValue(data[, callback(error)]); // data is a buffer 
peripheral.readHandle(handle, callback(error, data));
peripheral.writeHandle(handle, data, withoutResponse, callback(error));

See Node.js EventEmitter docs for more info. on API's.

state = <"unknown" | "resetting" | "unsupported" | "unauthorized" | "poweredOff" | "poweredOn">
 
noble.on('stateChange', callback(state));
noble.on('scanStart', callback);

The event is emitted when scanning is started or if another application enables scanning or changes scanning settings.

noble.on('scanStop', callback);

The event is emitted when scanning is stopped or if another application stops scanning.

peripheral = {
  id: "<id>",
  address: "<BT address">, // Bluetooth Address of device, or 'unknown' if not known 
  addressType: "<BT address type>", // Bluetooth Address type (public, random), or 'unknown' if not known 
  connectable: <connectable>, // true or false, or undefined if not known 
  advertisement: {
    localName: "<name>",
    txPowerLevel: <int>,
    serviceUuids: ["<service UUID>", ...],
    manufacturerData: <Buffer>,
    serviceData: [
        {
            uuid: "<service UUID>"
            data: <Buffer>
        },
        ...
    ]
  },
  rssi: <rssi>
};
 
noble.on('discover', callback(peripheral));
noble.on('warning', callback(message));
peripheral.once('connect', callback);
peripheral.once('disconnect', callback);
peripheral.once('rssiUpdate', callback(rssi));
peripheral.once('servicesDiscover', callback(services));
service.once('includedServicesDiscover', callback(includedServiceUuids));
characteristic = {
  uuid: "<uuid>",
   // properties: 'broadcast', 'read', 'writeWithoutResponse', 'write', 'notify', 'indicate', 'authenticatedSignedWrites', 'extendedProperties' 
  properties: [...]
};
 
service.once('characteristicsDiscover', callback(characteristics));

Emitted when characteristic read has completed, result of characteristic.read(...) or characteristic value has been updated by peripheral via notification or indication - after having been enabled with notify(true[, callback(error)]).

characteristic.on('data', callback(data, isNotification));
 
characteristic.once('read', callback(data, isNotification)); // legacy 

Emitted when characteristic write has completed, result of characteristic.write(...).

characteristic.once('write', withoutResponse, callback());

Emitted when characteristic broadcast state changes, result of characteristic.broadcast(...).

characteristic.once('broadcast', callback(state));

Emitted when characteristic notification state changes, result of characteristic.notify(...).

characteristic.once('notify', callback(state));
descriptor = {
  uuid: '<uuid>'
};
 
characteristic.once('descriptorsDiscover', callback(descriptors));
descriptor.once('valueRead', data);
descriptor.once('valueWrite');

Run the following command:

sudo setcap cap_net_raw+eip $(eval readlink -f `which node`)

This grants the node binary cap_net_raw privileges, so it can start/stop BLE advertising.

Note: The above command requires setcap to be installed, it can be installed using the following:

  • apt: sudo apt-get install libcap2-bin
  • yum: su -c \'yum install libcap2-bin\'

hci0 is used by default to override set the NOBLE_HCI_DEVICE_ID environment variable to the interface number.

Example, specify hci1:

sudo NOBLE_HCI_DEVICE_ID=1 node <your file>.js

By default noble waits for both the advertisement data and scan response data for each Bluetooth address. If your device does not use scan response the following environment variable can be used to bypass it.

sudo NOBLE_REPORT_ALL_HCI_EVENTS=1 node <your file>.js

By default noble will respond with an error whenever a GATT request message is received. If your intention is to use bleno in tandem with noble, the following environment variable can be used to bypass this functionality. Note: this requires a Bluetooth 4.1 adapter.

sudo NOBLE_MULTI_ROLE=1 node <your file>.js

By default, noble will select bindings to communicate with Bluetooth devices depending on your platform. If you prefer to specify what bindings noble should use:

var noble = require('noble/with-bindings')(require('./my-custom-bindings'));

Copyright (C) 2015 Sandeep Mistry sandeep.mistry@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.