A Node.js BLE (Bluetooth Low Energy) central module.
Want to implement a peripheral? Checkout bleno
Note: macOS / Mac OS X, Linux, FreeBSD and Windows are currently the only supported OSes. Other platforms may be developed later on.
- install Xcode
- Kernel version 3.6 or above
sudo apt-get install bluetooth bluez libbluetooth-dev libudev-dev
node is on your path, if it's not, some options:
sudo ln -s /usr/bin/nodejs /usr/bin/node
- install Node.js using the NodeSource package
Fedora / Other-RPM based
sudo yum install bluez bluez-libs bluez-libs-devel
Make sure you have GNU Make:
sudo pkg install gmake
Disable automatic loading of the default Bluetooth stack by putting no-ubt.conf into
/usr/local/etc/devd/no-ubt.conf and restarting devd (
sudo service devd restart).
ng_ubt kernel module if already loaded:
sudo kldunload ng_ubt
Make sure you have read and write permissions on the
/dev/usb/* device that corresponds to your Bluetooth adapter.
Install the required tools and configurations using Microsoft's windows-build-tools from an elevated PowerShell or cmd.exe (run as Administrator).
npm install --global --production windows-build-tools
- Compatible Bluetooth 4.0 USB adapter
- WinUSB driver setup for Bluetooth 4.0 USB adapter, using Zadig tool
Maximum simultaneous connections
This limit is imposed upon by the Bluetooth adapter hardware as well as it's firmware.
|OS X 10.11 (El Capitan)||6|
|Linux/Windows - Adapter dependent||5 (CSR based adapter)|
Adapter specific known issues
Some BLE adapters cannot connect to a peripheral while they are scanning (examples below). You will get the following messages when trying to connect :
Sena UD-100 (Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)) :
Error: Command disallowed
Intel Dual Band Wireless-AC 7260 (Intel Corporation Wireless 7260 (rev 73)) :
Error: Connection Rejected due to Limited Resources (0xd)
You need to stop scanning before trying to connect in order to solve this issue.
npm install noble
var noble = ;
noble; // any service UUID, no duplicatesnoble; // any service UUID, allow duplicatesvar serviceUUIDs = "<service UUID 1>" ...; // default:  => allvar allowDuplicates = <false|true>; // default: falsenoble; // particular UUID's
noble.state must be
poweredOn before scanning is started.
noble.on('stateChange', callback(state)); can be used register for state change events.
Disconnect or cancel pending connection
peripheral; // any service UUIDvar serviceUUIDs = "<service UUID 1>" ...;peripheral; // particular UUID's
Discover all services and characteristics
Discover some services and characteristics
var serviceUUIDs = "<service UUID 1>" ...;var characteristicUUIDs = "<characteristic UUID 1>" ...;peripheral;
Discover included services
service; // any service UUIDvar serviceUUIDs = "<service UUID 1>" ...;service; // particular UUID's
service // any characteristic UUIDvar characteristicUUIDs = "<characteristic UUID 1>" ...;service; // particular UUID's
characteristic; // data is a buffer, withoutResponse is true|false
false: send a write request, used with "write" characteristic property
true: send a write command, used with "write without response" characteristic property
characteristic; // broadcast is true|false
- subscribe to a characteristic, triggers
'data'events when peripheral sends an notification or indication
- use for characteristics with notify or indicate properties
- unsubscribe to a characteristic
- use for characteristics with notify or indicate properties
descriptor; // data is a buffer
See Node.js EventEmitter docs for more info. on API's.
Adapter state change
state = <"unknown" | "resetting" | "unsupported" | "unauthorized" | "poweredOff" | "poweredOn">noble;
The event is emitted when scanning is started or if another application enables scanning or changes scanning settings.
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 knownaddressType: "<BT address type>" // Bluetooth Address type (public, random), or 'unknown' if not knownconnectable: <connectable> // true or false, or undefined if not knownadvertisement:localName: "<name>"txPowerLevel: <int>serviceUuids: "<service UUID>" ...serviceSolicitationUuid: "<service solicitation UUID>" ...manufacturerData: <Buffer>serviceData:uuid: "<service UUID>"data: <Buffer>...rssi: <rssi>;noble;
Note: on OS X the address will be set to 'unknown' if the device has not been connected previously.
Included services discovered
characteristic =uuid: "<uuid>"// properties: 'broadcast', 'read', 'writeWithoutResponse', 'write', 'notify', 'indicate', 'authenticatedSignedWrites', 'extendedProperties'properties: ...;service;
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
characteristic;characteristic; // legacy
isNotification event parameter value MAY be
undefined depending on platform support. The parameter is deprecated after version 1.8.1, and not supported when on macOS High Sierra and later.
Emitted when characteristic write has completed, result of
Emitted when characteristic broadcast state changes, result of
Emitted when characteristic notification state changes, result of
descriptor =uuid: '<uuid>';characteristic;
Running on Linux
Running without root/sudo
Run the following command:
sudo setcap cap_net_raw+eip $(eval readlink -f `which node`)
This grants the
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:
sudo apt-get install libcap2-bin
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.
sudo NOBLE_HCI_DEVICE_ID=1 node <your file>.js
Reporting all HCI events
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
Override default bindings
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 = ;
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Copyright (C) 2015 Sandeep Mistry email@example.com
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