Datasheet

* @param chr Pointer client characteristic that even occurred,

* in this example it should be hrmc

* @param data Pointer to received data

* @param len Length of received data

void hrm_notify_callback(BLEClientCharacteristic* chr, uint8_t* data, uint16_t len)

{

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

// Measurement contains of control byte0 and measurement (8 or 16 bit) + optional field

// if byte0's bit0 is 0 --> measurement is 8 bit, otherwise 16 bit.

Serial.print("HRM Measurement: ");

if ( data[0] & bit(0) )

{

uint16_t value;

memcpy(&value, data+1, 2);

Serial.println(value);

}

else

{

Serial.println(data[1]);

}