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Example

The following example declares a HRM (Heart Rate Monitor) service, and assigns some characteristics to it:

BLEUuid uuid;

static BLEService* lastService;

BLEService(void);

BLEService(uint16_t uuid16);

BLEService(uint8_t const uuid128[]);

void setUuid(uint16_t uuid16);

void setUuid(uint8_t const uuid128[]);

virtual err_t begin(void);

Note that this example code is incomplete. For the full example open the 'custom_hrm' example that is part

of the nRF52 BSP! The code below is for illustration purposes only.

/* HRM Service Definitions

* Heart Rate Monitor Service: 0x180D

* Heart Rate Measurement Char: 0x2A37

* Body Sensor Location Char: 0x2A38

BLEService hrms = BLEService(UUID16_SVC_HEART_RATE);

BLECharacteristic hrmc = BLECharacteristic(UUID16_CHR_HEART_RATE_MEASUREMENT);

BLECharacteristic bslc = BLECharacteristic(UUID16_CHR_BODY_SENSOR_LOCATION);

void setupHRM(void)

{

// Configure the Heart Rate Monitor service

// See: https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.service.heart_rate.xml

// Supported Characteristics:

// Name UUID Requirement Properties

// ---------------------------- ------ ----------- ----------

// Heart Rate Measurement 0x2A37 Mandatory Notify

// Body Sensor Location 0x2A38 Optional Read

// Heart Rate Control Point 0x2A39 Conditional Write <-- Not used here

hrms.begin();

// Note: You must call .begin() on the BLEService before calling .begin() on

// any characteristic(s) within that service definition.. Calling .begin() on

// a BLECharacteristic will cause it to be added to the last BLEService that

// was 'begin()'ed!

// Configure the Heart Rate Measurement characteristic

// See: https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.heart_rate_measurement.xml

// Permission = Notify

// Min Len = 1

// Max Len = 8

// B0 = UINT8 - Flag (MANDATORY)

// b5:7 = Reserved

// b4 = RR-Internal (0 = Not present, 1 = Present)

// b3 = Energy expended status (0 = Not present, 1 = Present)

// b1:2 = Sensor contact status (0+1 = Not supported, 2 = Supported but contact not detected, 3 = Supported and detected)