BLERemoteDescriptor Class

BLERemoteDescriptor Class

Description
A class used for managing BLE GATT descriptors on connected remote devices.

Syntax
class BLERemoteDescriptor

Members

Public Constructors
No public constructor is available for this class. You can get a pointer to an instance of this class using BLERemoteCharacteristic::getDescriptor().
Public Methods 
BLERemoteDescriptor::getUUIDGet the descriptor UUID
BLERemoteDescriptor::setBufferLenSet the size of the internal data buffer
BLERemoteDescriptor::getBufferLenGet the current size of the internal data buffer
BLERemoteDescriptor::readStringRead the descriptor data buffer as a String object
BLERemoteDescriptor::readData8Read the descriptor data buffer as an unsigned 8-bit integer
BLERemoteDescriptor::readData16Read the descriptor data buffer as an unsigned 16-bit integer
BLERemoteDescriptor::readData32Read the descriptor data buffer as an unsigned 32-bit integer
BLERemoteDescriptor::writeStringWrite data to the descriptor as a String object or character array
BLERemoteDescriptor::writeData8Write data to the descriptor as an unsigned 8-bit integer
BLERemoteDescriptor::writeData16Write data to the descriptor as an unsigned 16-bit integer
BLERemoteDescriptor::writeData32Write data to the descriptor as an unsigned 16-bit integer
BLERemoteDescriptor::setDataWrite data to the descriptor
BLERemoteDescriptor::getDataRead data from the descriptor

BLERemoteDescriptor::getUUID

Description
Get the descriptor UUID.

Syntax
BLEUUID getUUID();

Parameters
The function requires no input parameter.

Returns
The function returns the descriptor UUID as a BLEUUID class object.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::setBufferLen

Description
Set the size of the internal data buffer of the descriptor.

Syntax
void setBufferLen(uint16_t max_len);

Parameters
max_len: number of bytes to resize the internal buffer to.

Returns
The function returns nothing.

Example Code
NA

Notes and Warnings
Descriptor data buffer has a default size of 20 bytes and can be increased up to 230 bytes.
 

BLERemoteDescriptor::getBufferLen

Description
Get the size of the descriptor internal buffer.

Syntax
uint16_t getBufferLen();

Parameters
The function requires no input parameter.

Returns
The function returns the currently set internal buffer size.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::readString

Description
Request for descriptor data from the remote device and read the data in the buffer, expressed as a String class object.

Syntax
String readString();

Parameters
The function requires no input parameter.

Returns
The function returns the data in the descriptor buffer expressed as a String class object.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::readData8

Description
Request for descriptor data from the remote device and read the data in the buffer, expressed as an unsigned 8-bit integer.

Syntax
uint8_t readData8();

Parameters
The function requires no input parameter.

Returns
The function returns the data in the descriptor buffer expressed as a uint8_t value.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::readData16

Description
Request for descriptor data from the remote device and read the data in the buffer, expressed as an unsigned 16-bit integer.

Syntax
uint16_t readData16();

Parameters
The function requires no input parameter.

Returns
The function returns the data in the descriptor buffer expressed as a uint16_t value.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::readData32

Description
Request for descriptor data from the remote device and read the data in the buffer, expressed as an unsigned 32-bit integer.

Syntax
uint32_t readData32();

Parameters
The function requires no input parameter.

Returns
The function returns the data in the descriptor buffer expressed as a uint32_t value.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::writeString

Description
Write data to the remote device descriptor as a String object or character array.

Syntax
bool writeString(String str);
bool writeString(const char* str);

Parameters
str: the data to write to the remote descriptor, expressed as a String class object or a char array.

Returns
The function returns TRUE if write data is successful.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::writeData8

Description
Write data to the remote device descriptor as an unsigned 8-bit integer.

Syntax
bool writeData8(uint8_t num);

Parameters
num: the data to write to the descriptor buffer expressed as an unsigned 8-bit integer.

Returns
The function returns TRUE if write data is successful.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::writeData16

Description
Write data to the remote device descriptor as an unsigned 16-bit integer.

Syntax
bool writeData16(uint16_t num);

Parameters
num: the data to write to the descriptor buffer expressed as an unsigned 16-bit integer.

Returns
The function returns TRUE if write data is successful.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::writeData32

Description
Write data to the remote device descriptor as a 32-bit integer.

Syntax
bool writeData32(uint32_t num);
bool writeData32(int num);

Parameters
num: the data to write to the descriptor buffer expressed as a 32-bit integer.

Returns
The function returns TRUE if write data is successful.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::setData

Description
Write data to the remote device descriptor.

Syntax
bool setData(uint8_t* data, uint16_t datalen);

Parameters
data: pointer to byte array containing desired data
datalen: number of bytes of data to write

Returns
The function returns TRUE if write data is successful.

Example Code
NA

Notes and Warnings
NA
 

BLERemoteDescriptor::getData

Description
Request for descriptor data from the remote device and read the data in the buffer.

Syntax
uint16_t getData(uint8_t* data, uint16_t datalen);

Parameters
data: pointer to byte array to save data read from buffer
datalen: number of bytes of data to read

Returns
The function returns the number of bytes read.

Example Code
NA

Notes and Warnings
If the data buffer contains less data than requested, it will only read the available number of bytes of data.
 

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