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BLEPeripheralObserver

Constructor

Creates the BLEPeripheralObserver object. Pin Arguments are optional as pins are self detecting. See https://github.com/sandeepmistry/arduino-BLEPeripheral#pinouts

BLEPeripheralObserver(unsigned char req = BLE_DEFAULT_REQ, unsigned char rdy = BLE_DEFAULT_RDY, unsigned char rst = BLE_DEFAULT_RST);
  • req - REQ pin
  • rdy - RDY pin
  • rst - RST pin, can be UNUSED

Advertising

Local name

void setLocalName(const char *localName);
  • localName - local name to advertise (up to: 20 characters on nRF8001, 29 characters on nRF51822)

Service UUID

void setAdvertisedServiceUuid(const char* advertisedServiceUuid);
  • advertisedServiceUuid - service UUID to advertise

Manufacturer Data

void setManufacturerData(const unsigned char manufacturerData[], unsigned char manufacturerDataLength);
  • manufacturerData - array of bytes
  • manufacturerDataLength - length of array, up to: 20 bytes on nRF8001, 26 bytes on nRF51822

Set Advertising Interval

void setAdvertisingInterval(unsigned short advertisingInterval);
  • set advertising interval in ms, default is 100ms

Set Connection Interval

Sets the connection interval to use after a connection has been established.

void setConnectionInterval(unsigned short minimumConnectionInterval, unsigned short maximumConnectionInterval);
  • minimumConnectionInterval - minimum connection interval in 1.25 ms increments
  • maximumConnectionInterval - maximum connection interval in 1.25 ms increments

Note: Both parameters must be between 0x0006 (7.5 ms) and 0x0c80 (4 s), values outside of this range will be ignored.

Set TX Power

bool setTxPower(int txPower);
  • set TX power in dBm, default value is 0 dBm, must be called after begin. Returns true on success, false otherwise.

Note: only certain values can be set with exactly, otherwise the next settable value is used

  • nRF8001: -18, -12, -6, 0
  • nRF51822: -40, -30, -20, -16, -12, -8, -4, 0, 4

Connectable

void setConnectable(bool connectable);
  • make peripheral connectable (default) or non-connectable (broadcast only)

Bond Store

void setBondStore(BLEBondStore& bondStore);
  • enable unauthenticated security (pairing), use the bond store to persist bonding data.

Built-in characteristics

Device name

void setDeviceName(const char* deviceName);
  • deviceName - device name, up to: 20 characters on nRF8001 and nRF51822 - default value is "Arduino"

Appearance

void setAppearance(unsigned short appearance);
  • appearance - appearance, default value is 0x0000

Attributes

void addAttribute(BLEAttribute& attribute);
  • attribute - attribute to add, can be BLEService, BLECharacteristic, or BLEDescriptor

Sketch life cycle

Call from setup.

void begin();

Call from loop.

void poll();

Status

Connection state

Is the peripheral connected to a central?

bool connected();

Central

Central the peripheral is connected to. Bool value evaluates to false if not connected.

BLECentral central()

Set event handler callbacks

void setEventHandler(BLEPeripheralEvent event, BLEPeripheralEventHandler eventHandler);

// callback signature
void blePeripheralEventHandler(BLECentral& central) {
  // ....
}
  • event - BLEConnected or BLEDisconnected
  • eventHandler - function callback for event

Actions

Disconnect

void disconnect();

Disconnect connected central.

BLECentral

Status

Valid

Is this a valid central?

BLECentral central;

// ...

if (central) {
  // central is valid
} else {
  // central is invalid
}

Connection state

Is the central connected?

bool connected();

Address

Bluetooth address of central as string.

const char* address();

Actions

Disconnect

void disconnect();

Disconnect central if connected.

End

void end();

Disconnects central if connected, stops advertising, and disables radio.

Sketch life cycle

Call from loop, while connected.

void poll();

BLEService

Constructor

BLEService(const char* uuid);
  • uuid - UUID of service

BLECharacteristic

Contructor

BLECharacteristic(const char* uuid, unsigned char properties, unsigned char valueSize);

BLECharacteristic(const char* uuid, unsigned char properties, const char* value);
  • uuid - UUID of characteristic
  • properties - combination of (|'ed):
    • BLEBroadcast
    • BLERead
    • BLEWriteWithoutResponse
    • BLEWrite
    • BLENotify
    • BLEIndicate

Choice of:

  • valueSize - size of characteristic in bytes (max: 20 characters on nRF8001 and nRF51822)

or

  • value - string value (max: 20 characters on nRF8001 and nRF51822)

Get value

const unsigned char* value();
unsigned char valueLength();

Set value

Will automatically notify/indicate central, if characteristic has notify/indicate property and central is subscribed and update broadcasted value if broadcasting.

bool setValue(const unsigned char value[], unsigned char length);
  • value - value bytes
  • length - value length (up to value size)

Returns true on success (central notified/indicated, if applicable), false on failure (cannot be notified/indicated, if applicable)

bool setValue(const char* value);
  • value - new value as string

Returns true on success (central notified/indicated, if applicable), false on failure (cannot be notified/indicated, if applicable)

Broadcast

Broadcast characteristic value in advertisement data.

bool broadcast();

Returns true on success, false on failure

Writes

Has the central written a new value since the last call to this method? (only for write or write without response characteristics)

bool written();

Subscription status

Is the central subscribed (via notify or indicate) to the characteristic? (only for notify/indicate characteristics)

bool subscribed();

Notify/indicate status

Can the central be notified/indicated of when the value is set. Only applies to characteristics with notify and/or indicate properties when a central is connected and subscribed

bool canNotify();
bool canIndicate();

Set event handler callbacks

void setEventHandler(BLECharacteristicEvent event, BLECharacteristicEventHandler eventHandler);

// callback signature
void bleCharacteristicEventHandler(BLECentral& central, BLECharacteristic& characteristic) {
  // ....
}
  • event - BLEWritten, BLESubscribed, or BLEUnsubscribed
  • eventHandler - function callback for event

Typed BLECharacteristic's

Data Type Class
bool BLEBoolCharacteristic
char BLECharCharacteristic
unsigned char BLEUnsignedCharCharacteristic
short BLEShortCharacteristic
unsigned short BLEUnsignedShortCharacteristic
int BLEIntCharacteristic
unsigned int BLEUnsignedIntCharacteristic
long BLELongCharacteristic
unsigned long BLEUnsignedLongCharacteristic
float BLEFloatCharacteristic
double BLEDoubleCharacteristic

Contructor

BLE<Data Type>Characteristic(const char* uuid, unsigned char properties);

See BLECharacteristic

Get value

<Data Type> value();
<Data Type> valueLE(); // little endian
<Data Type> valueBE(); // big endian

Set value

bool setValue(<Data Type> value);
bool setValueLE(<Data Type> value); // little endian
bool setValueBE(<Data Type> value); // big endian

Returns true on success (central notified/indicated, if applicable), false on failure (cannot be notified/indicated, if applicable)

BLEFixedLengthCharacteristic

  • Subclass of BLECharacteristic, value is a fixed length

Constructor

BLEFixedLengthCharacteristic(const char* uuid, unsigned char properties, unsigned char valueSize);
BLEFixedLengthCharacteristic(const char* uuid, unsigned char properties, const char* value);
  • uuid - UUID of characteristic
  • properties - combination of (|'ed):
    • BLEBroadcast
    • BLERead
    • BLEWriteWithoutResponse
    • BLEWrite
    • BLENotify
    • BLEIndicate

Choice of:

  • valueSize - size of characteristic in bytes (max: 20 characters on nRF8001 and nRF51822)

or

  • value - string value (max: 20 characters on nRF8001 and nRF51822)

BLEConstantCharacteristic

  • Subclass of BLEFixedLengthCharacteristic, value is constant and a fixed length. Is read only and, setValue API does nothing.

Constructor

BLEConstantCharacteristic(const char* uuid, const unsigned char value[], unsigned char length);
BLEConstantCharacteristic(const char* uuid, const char* value);
  • uuid - UUID of characteristic

Choice of:

  • value - value of characteristic
  • length - size of characteristic in bytes

or

  • value - string value (max: 20 characters on nRF8001 and nRF51822)

BLEDescriptor

Constructor

BLEDescriptor(const char* uuid, const unsigned char value[], unsigned char valueSize);

BLEDescriptor(const char* uuid, const char* value);
  • uuid - UUID of descriptor

Choice of:

  • value - value data
  • valueLength - length of value data in bytes

or

  • value - string value

Get value

const unsigned char* value();
unsigned char valueLength();

BLEBondStore

Constructor

BLEBondStore(int offset = 0);
  • offset - offset in persistent storage (AVR: EEPROM, NRF51: Flash, others RAM)

Clear Data

void clearData();

Clear bond data from store, must be called before blePeripheral.begin()