cordova-plugin-bluetoothle-improvisio
Advanced tools
Use the Bluetooth Low Energy plugin to connect your Cordova app to new Bluetooth devices like heart rate monitors, thermometers, etc...
This plugin allows you to interact with Bluetooth LE devices on Android, iOS, and partially on Windows.
I'm available for part time contracting work. This would really help keep the project alive and up to date. You can contact me via: randdusing@gmail.com, Facebook, LinkedIn or Twitter for more information.
Check out ng-cordova-bluetoothle here!
If timeouts or queueing is needed, please check out the Angular wrapper and its example. I don't plan to implement queuing within the plugin itself anymore.
Cordova
cordova plugin add cordova-plugin-bluetoothle
PhoneGap Build
<gap:plugin name="cordova-plugin-bluetoothle" source="npm" />
By default, background mode is enabled. If you wish to remove this, follow the steps below:
Updating the plugin for iOS sometimes causes BluetoothLePlugin.m to be removed from the Compile Sources and CoreBluetooth.framework to be removed from Link Binary with Libraries. To fix:
The latest version of the plugin requires you to set the Android target API to a minimum of 23 to support permission requirements for scanning. If you can't target 23, please use plugin version 2.4.0 or below.
Discovery works differently between Android and iOS. In Android, a single function is called to initiate discovery of all services, characteristics and descriptors on the device. In iOS, a single function is called to discover the device's services. Then another function to discover the characteristics of a particular service. And then another function to discover the descriptors of a particular characteristic. The Device plugin should be used to properly determine the device and make the proper calls if necessary. Additionally, if a device is disconnected, it must be rediscovered when running on iOS. iOS now supports Android style discovery, but use with caution. It's a bit buggy on iOS8, but seems to work fine on iOS9.
UUIDs can be 16 bits or 128 bits. The "out of the box" UUIDs from the link below are 16 bits. Since iOS returns the 16 bit version of the "out of the box" UUIDs even if a 128 bit UUID was used in the parameters, the 16 bit version should always be used for the "out of the box" UUIDs for consistency. Android on the other hand only uses the 128 bit version, but the plugin will automatically convert 16 bit UUIDs to the 128 bit version on input and output. For a list of out of the box UUIDS, see Bluetooth Developer Portal
On iOS, the MAC address is hidden from the advertisement packet, and the address returned from the scanResult is a generated, device-specific address. This is a problem when using devices like iBeacons where you need the MAC Address. Fortunately the CLBeacon class can be used for this, but unfortunately it's not supported in this plugin. One option is to set Manufacturer Specific Data in the advertisement packet if that's possible in your project. Another option is to connect to the device and use the "Device Information" (0x180A) service, but connecting to each device is much more energy intensive than scanning for advertisement data. See the following StackOverflow posts for more info: here and here
Neither Android nor iOS support Bluetooth on emulators, so you'll need to test on a real device.
Whenever the error callback is executed, the return object will contain the error type and a message.
For example:
{"error":"startScan", "message":"Scanning already started"}
Characteristics can have the following different permissions: read, readEncrypted, readEncryptedMITM, write, writeEncrypted, writeEncryptedMITM, writeSigned, writeSignedMITM. Unfortuately, the getProperties() call always seems to return 0, which means no properties are set. Not sure if this is an issue with my mobile device or that all the Bluetooth devices just don't have the properties set. If the characteristic has a permission, it will exist as a key in the characteristic's permissions object. See discovery().
Characteristics can have the following different properties: broadcast, read, writeWithoutResponse, write, notify, indicate, authenticatedSignedWrites, extendedProperties, notifyEncryptionRequired, indicateEncryptionRequired. If the characteristic has a property, it will exist as a key in the characteristic's properties object. See discovery() or characteristics()
iOS Docs and Android Docs
Initialize Bluetooth on the device. Must be called before anything else. Callback will continuously be used whenever Bluetooth is enabled or disabled. Note: Although Bluetooth initialization could initially be successful, there's no guarantee whether it will stay enabled. Each call checks whether Bluetooth is disabled. If it becomes disabled, the user must connect to the device, start a read/write operation, etc again. If Bluetooth is disabled, you can request the user to enable it by setting the request property to true. The request property in the params argument is optional and defaults to false. Also, this function should only be called once.
bluetoothle.initialize(initializeSuccess, initializeError, params);
{
"request": true,
"statusReceiver": false
}
{
"status": "enabled"
}
Enable Bluetooth on the device. Android support only.
bluetoothle.enable(enableSuccess, enableError);
The successCallback isn't actually used. Listen to initialize callbacks for change in Bluetooth state. A successful enable will return a status => enabled via initialize success callback.
Disable Bluetooth on the device. Android support only.
bluetoothle.disable(disableSuccess, disableError);
The successCallback isn't actually used. Listen to initialize callbacks for change in Bluetooth state. A successful disable will return an error => enable via initialize error callback.
Scan for Bluetooth LE devices. Since scanning is expensive, stop as soon as possible. The Cordova app should use a timer to limit the scan interval. Also, Android uses an AND operator for filtering, while iOS uses an OR operator. Android API >= 23 requires ACCESS_COARSE_LOCATION permissions to find unpaired devices. Permissions can be requested by using the hasPermission and requestPermission functions.
bluetoothle.startScan(startScanSuccess, startScanError, params);
{
"services": [
"180D",
"180F"
],
"allowDuplicates": true
"scanMode": bluetoothle.SCAN_MODE_LOW_LATENCY,
"matchMode": bluetoothle.MATCH_MODE_AGGRESSIVE,
"matchNum": bluetoothle.MATCH_NUM_MAX_ADVERTISEMENT,
"callbackType": bluetoothle.CALLBACK_TYPE_ALL_MATCHES,
}
{
"status": "scanStarted"
}
{
"status": "scanResult",
"advertisement": "awArG05L", //Android
"advertisement": { //iOS
"serviceUuids": [
"180D"
],
"manufacturerData": "awAvFFZY",
"txPowerLevel": 0,
"overflowServiceUuids": [
],
"isConnectable": true,
"solicitedServiceUuids": [
],
"serviceData": {
},
"localName": "Polar H7 3B321015"
},
"rssi": -58,
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Stop scan for Bluetooth LE devices. Since scanning is expensive, stop as soon as possible. The app should use a timer to limit the scanning time.
bluetoothle.stopScan(stopScanSuccess, stopScanError);
{
"status": "scanStopped"
}
Retrieved paired Bluetooth LE devices. Yes, this function should be renamed, but I went with iOS's naming. In iOS, devices that are "paired" to will not return during a normal scan. Callback is "instant" compared to a scan. I haven't been able to get UUID filtering working on Android, so it returns all paired BLE devices.
bluetoothle.retrieveConnected(retrieveConnectedSuccess, retrieveConnectedError, params);
{
"services": [
"180D",
"180F"
]
}
An array of device objects:
[
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
]
Connect to a Bluetooth LE device. The app should use a timer to limit the connecting time in case connecting is never successful. Once a device is connected, it may disconnect without user intervention. The original connection callback will be called again and receive an object with status => disconnected. To reconnect to the device, use the reconnect method. If a timeout occurs, the connection attempt should be canceled using disconnect(). For simplicity, I recommend just using connect() and close(), don't use reconnect() or disconnect().
bluetoothle.connect(connectSuccess, connectError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"status": "connected"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"status": "disconnected"
}
Reconnect to a previously connected Bluetooth device. The app should use a timer to limit the connecting time. If a timeout occurs, the reconnection attempt should be canceled using disconnect() or close().
bluetoothle.reconnect(reconnectSuccess, reconnectError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"status": "connected"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"status": "disconnected"
}
Disconnect from a Bluetooth LE device. It's simpler to just call close().
bluetoothle.disconnect(disconnectSuccess, disconnectError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"status": "disconnected"
}
Close/dispose a Bluetooth LE device. Prior to 2.7.0, you needed to disconnect to the device before closing, but this is no longer the case.
bluetoothle.close(closeSuccess, closeError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"status": "closed"
}
Discover all the devices services, characteristics and descriptors. Doesn't need to be called again after disconnecting and then reconnecting. If using iOS, you shouldn't use discover and services/characteristics/descriptors on the same device. There seems to be an issue with calling discover on iOS8 devices, so use with caution.
bluetoothle.discover(discoverSuccess, discoverError, params);
{
"address": "00:22:D0:3B:32:10"
}
Device Object:
Service Object:
Characteristic Object:
Descriptor Object:
{
"address": "00:22:D0:3B:32:10",
"status": "discovered",
"services": [
{
"characteristics": [
{
"descriptors": [
],
"uuid": "2a00", // [Device Name](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.device_name.xml)
"properties": {
"write": true,
"writeWithoutResponse": true,
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a01", // [Appearance](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.appearance.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a02", // [Peripheral Privacy Flag](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.peripheral_privacy_flag.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a03", // [Reconnection Address](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.reconnection_address.xml)
"properties": {
"write": true
}
},
{
"descriptors": [
],
"uuid": "2a04", // [Pheripheral Preferred Connection Parameters](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.peripheral_preferred_connection_parameters.xml)
"properties": {
"read": true
}
}
],
"uuid": "1800" // [Generic Access](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.generic_access.xml)
},
{
"characteristics": [
{
"descriptors": [
{
"uuid": "2902"
}
],
"uuid": "2a05", // [Service Changed](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gatt.service_changed.xml)
"properties": {
"indicate": true
}
}
],
"uuid": "1801" // [Generic Attribute](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.generic_attribute.xml)
},
{
"characteristics": [
{
"descriptors": [
{
"uuid": "2902"
}
],
"uuid": "2a37", // [Heart Rate Measurement](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml)
"properties": {
"notify": true
}
},
{
"descriptors": [
],
"uuid": "2a38", // [Body Sensor Location](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml)
"properties": {
"read": true
}
}
],
"uuid": "180d" // [Heart Rate](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml)
},
{
"characteristics": [
{
"descriptors": [
],
"uuid": "2a23", // [System ID](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.system_id.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a24", // [Model Number String](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.model_number_string.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a25", // [Serial Number String](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.serial_number_string.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a26", // [Firmware Revision String](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.firmware_revision_string.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a27", // [hardware Revision String](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.hardware_revision_string.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a28", // [Software Revision String](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.software_revision_string.xml)
"properties": {
"read": true
}
},
{
"descriptors": [
],
"uuid": "2a29", // [Manufacturer Name String](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.manufacturer_name_string.xml)
"properties": {
"read": true
}
}
],
"uuid": "180a" // [Device Information](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.device_information.xml)
},
{
"characteristics": [
{
"descriptors": [
],
"uuid": "2a19", // [Battery Level](https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.battery_level.xml)
"properties": {
"read": true
}
}
],
"uuid": "180f" // [Battery Service](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.battery_service.xml)
},
{
"characteristics": [
{
"descriptors": [
],
"uuid": "6217ff4c-c8ec-b1fb-1380-3ad986708e2d",
"properties": {
"read": true
}
},
{
"descriptors": [
{
"uuid": "2902"
}
],
"uuid": "6217ff4d-91bb-91d0-7e2a-7cd3bda8a1f3",
"properties": {
"write": true,
"indicate": true
}
}
],
"uuid": "6217ff4b-fb31-1140-ad5a-a45545d7ecf3"
}
],
"name": "Polar H7 3B321015"
}
Discover the device's services. Not providing an array of services will return all services and take longer to discover. iOS support only.
bluetoothle.services(servicesSuccess, servicesError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"services": [
]
}
{
"status": "services",
"services": [
"180d",
"180a",
"180f",
"6217ff4b-fb31-1140-ad5a-a45545d7ecf3"
],
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Discover the service's characteristics. Not providing an array of characteristics will return all characteristics and take longer to discover. iOS support only.
bluetoothle.characteristics(characteristicsSuccess, characteristicsError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"service": "180d",
"characteristics": [
]
}
{
"status": "characteristics",
"characteristics": [
{
"properties": {
"notify": true
},
"uuid": "2a37"
},
{
"properties": {
"read": true
},
"uuid": "2a38"
}
],
"name": "Polar H7 3B321015",
"service": "180d",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Discover the characteristic's descriptors. iOS support only.
bluetoothle.descriptors(descriptorsSuccess, descriptorsError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"service": "180d",
"characteristic": "2a37"
}
{
"status": "descriptors",
"descriptors": [
"2902"
],
"characteristic": "2a37",
"name": "Polar H7 3B321015",
"service": "180d",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Read a particular service's characteristic once.
bluetoothle.read(readSuccess, readError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"service": "180d",
"characteristic": "2a38"
}
{
"status": "read",
"value": "AQ==",
"characteristic": "2a38",
"name": "Polar H7 3B321015",
"service": "180d",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Subscribe to a particular service's characteristic. Once a subscription is no longer needed, execute unsubscribe in a similar fashion. The Client Configuration descriptor will automatically be written to enable notification/indication.
bluetoothle.subscribe(subscribeSuccess, subscribeError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"service": "180d",
"characteristic": "2a37",
"isNotification" : true
}
{
"status": "subscribed",
"characteristic": "2a37",
"name": "Polar H7 3B321015",
"service": "180d",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"status": "subscribedResult",
"value": "BkY=",
"characteristic": "2a37",
"name": "Polar H7 3B321015",
"service": "180d",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Unsubscribe to a particular service's characteristic.
bluetoothle.unsubscribe(unsubscribeSuccess, unsubscribeError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"service": "180d",
"characteristic": "2a37"
}
{
"status": "unsubscribed",
"characteristic": "2a37",
"name": "Polar H7 3B321015",
"service": "180d",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Write a particular service's characteristic.
bluetoothle.write(writeSuccess, writeError, params);
Value is a base64 encoded string of bytes to write. Use bluetoothle.bytesToEncodedString(bytes) to convert to base64 encoded string from a unit8Array. To write without response, set type to "noResponse". Any other value will default to write with response. Note, no callback will occur on write without response.
var string = "Hello World";
var bytes = bluetoothle.stringToBytes(string);
var encodedString = bluetoothle.bytesToEncodedString(encodedString);
//Note, this example doesn't actually work since it's read only characteristic
{"value":encodedString,"service":"180F","characteristic":"2A19","type":"noResponse","address":"ABC123"}
Value is a base64 encoded string of written bytes. Use bluetoothle.encodedStringToBytes(obj.value) to convert to a unit8Array. See characteristic's specification and example below on how to correctly parse this.
var returnObj = {"status":"written","service":"180F","characteristic":"2A19","value":"SGVsbG8gV29ybGQ=","address":"ABC123"}
var bytes = bluetoothle.encodedStringToBytes(returnObj.value);
var string = bluetoothle.bytesToString(bytes); //This should equal Hello World!
Read a particular characterist's descriptor
bluetoothle.read(readDescriptorSuccess, readDescriptorError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"service": "180d",
"characteristic": "2a37",
"descriptor": "2902"
}
{
"status": "readDescriptor",
"service": "180d",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"characteristic": "2a37",
"value": "AQAAAAAAAAA=",
"name": "Polar H7 3B321015",
"descriptor": "2902"
}
Write a particular characteristic's descriptor. Unable to write characteristic configuration directly to keep in line with iOS implementation. Instead use subscribe/unsubscribe, which will automatically enable/disable notification. Note, limited testing and likely needs to be made more generic
bluetoothle.writeDescriptor(writeDescriptorSuccess, writeDescriptorError, params);
Value is a base64 encoded string of bytes to write. Use bluetoothle.bytesToEncodedString(bytes) to convert to base64 encoded string from a unit8Array.
var string = "Hello World";
var bytes = bluetoothle.stringToBytes(string);
var encodedString = bluetoothle.bytesToEncodedString(encodedString);
{"service":"180D","characteristic":"2A37","descriptor":"2902","value":encodedString,"address":"ABC123"}
Value is a base64 encoded string of written bytes. Use bluetoothle.encodedStringToBytes(obj.value) to convert to a unit8Array.
{"status":"writeDescriptor","service":"180D","characteristic":"2A37", "descriptor":"2902","value":"SGVsbG8gV29ybGQ","address":"ABC123"}
var bytes = bluetoothle.encodedStringToBytes(returnObj.value);
var string = bluetoothle.bytesToString(bytes); //This should equal Hello World!
Read RSSI of a connected device. RSSI is also returned with scanning.
bluetoothle.rssi(rssiSuccess, rssiError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"status": "rssi",
"rssi": -50,
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Set MTU of a connected device. Android only.
bluetoothle.mtu(mtuSuccess, mtuError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"mtu" : 50
}
{
"status": "mtu",
"mtu": 50,
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
Determine whether the adapter is initialized. No error callback. Returns true or false
bluetoothle.isInitialized(isInitialized);
{
"isInitialized": true
}
Determine whether the adapter is enabled. No error callback
bluetoothle.isEnabled(isEnabled);
{
"isEnabled": true
}
Determine whether the adapter is initialized. No error callback. Returns true or false
bluetoothle.isScanning(isScanning);
{
"isScanning": false
}
Determine whether the device is connected, or error if not initialized or never connected to device.
bluetoothle.isConnected(isConnectedSuccess, isConnectedError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"isConnected": false
}
Determine whether the device's characteristics and descriptors have been discovered, or error if not initialized or never connected to device.
bluetoothle.isDiscovered(isDiscoveredSuccess, isDiscoveredError, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"isDiscovered": false
}
Determine whether coarse location privileges are granted since scanning for unpaired devices requies it in Android API 23
bluetoothle.hasPermission(hasPermissionSuccess);
{
"hasPermission": true
}
Request coarse location privileges since scanning for unpaired devices requies it in Android API 23.
bluetoothle.requestPermission(requestPermissionSuccess);
{
"requestPermission": true
}
Request a change in the connection priority to improve throughput when transfer large amounts of data via BLE. Android support only. iOS will return error.
bluetoothle.requestConnectionPriority(success, error, params);
{
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"connectionPriority" : "balanced"
}
{
"name": "Polar H7 3B321015",
"address": "ECC037FD-72AE-AFC5-9213-CA785B3B5C63",
"status" : "connectionPriorityRequested"
}
Helper function to convert a base64 encoded string from a characteristic or descriptor value into a uint8Array object.
bluetoothle.encodedStringToBytes(string);
Helper function to convert a unit8Array to a base64 encoded string for a characteric or descriptor write.
bluetoothle.bytesToEncodedString(bytes);
Helper function to convert a string to bytes.
bluetoothle.stringToBytes(string);
Helper function to convert bytes to a string.
bluetoothle.bytesToString(bytes);
See the example provided with the Angular Wrapper
if (obj.status == "subscribedResult")
{
//Turn the base64 string into an array of unsigned 8bit integers
var bytes = bluetoothle.encodedStringToBytes(obj.value);
if (bytes.length === 0)
{
return;
}
//NOTE: Follow along to understand how the parsing works
//https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml
//First byte provides instructions on what to do with the remaining bytes
var flag = bytes[0];
//Offset from beginning of the array
var offset = 1;
//If the first bit of the flag is set, the HR is in 16 bit form
if ((flag & 0x01) == 1)
{
//Extract second and third bytes and convert to 16bit unsigned integer
var u16bytesHr = bytes.buffer.slice(offset, offset + 2);
var u16Hr = new Uint16Array(u16bytesHr)[0];
//16 bits takes up 2 bytes, so increase offset by two
offset += 2;
}
//Else the HR is in 8 bit form
else
{
//Extract second byte and convert to 8bit unsigned integer
var u8bytesHr = bytes.buffer.slice(offset, offset + 1);
var u8Hr = new Uint8Array(u8bytesHr)[0];
//Or I believe I could just do this: var u8Hr = u8bytesHr[offset]
//8 bits takes up 1 byte, so increase offset by one
offset += 1;
}
//NOTE: I'm ignoring the second and third bit because I'm not interested in the sensor contact, and it doesn't affect the offset
//If the fourth bit is set, increase the offset to skip over the energy expended information
if ((flag & 0x08) == 8)
{
offset += 2;
}
//If the fifth bit is set, get the RR interval(s)
if ((flag & 0x10) == 16)
{
//Number of rr intervals
var rrCount = (bytes.length - offset) / 2;
for (var i = rrCount - 1; i >= 0; i--)
{
//Cast to 16 bit unsigned int
var u16bytesRr = bytes.buffer.slice(offset, offset + 2);
var u16Rr = new Uint16Array(u16bytesRr)[0];
//Increase offset
offset += 2;
}
}
}
The MIT License (MIT)
Copyright (c) 2016 Rand Dusing and contributors.
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.
FAQs
Use the Bluetooth Low Energy plugin to connect your Cordova app to new Bluetooth devices like heart rate monitors, thermometers, etc...
The npm package cordova-plugin-bluetoothle-improvisio receives a total of 8 weekly downloads. As such, cordova-plugin-bluetoothle-improvisio popularity was classified as not popular.
We found that cordova-plugin-bluetoothle-improvisio demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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