cycling speed and cadence sensor and Adafruit Bluefruit feather NRF52832

Question

hello 
 I am a newbee in BLE dev. 
 I try to connect the sensor to the Adafruit board thrut BLE. The sensor is Sensor it is saw on nrf connect iOS as 
 
 I mod the HRM central code to match with the CSC Here my code I send to the board with Arduino ide 
 
#include <bluefruit.h>



BLEClientService hrms(UUID16_SVC_HEART_RATE);
BLEClientCharacteristic hrmc(UUID16_CHR_HEART_RATE_MEASUREMENT);
BLEClientCharacteristic bslc(UUID16_CHR_BODY_SENSOR_LOCATION);

void setup()
{
 Serial.begin(115200);
 while ( !Serial ) delay(10); // for nrf52840 with native usb

 Serial.println("Bluefruit52 Central Custom HRM Example");
 Serial.println("--------------------------------------
");


 Bluefruit.begin(0, 1);

 Bluefruit.setName("Bluefruit52 Central");

 hrms.begin();

 bslc.begin();

 hrmc.setNotifyCallback(hrm_notify_callback);
 hrmc.begin();


 Bluefruit.setConnLedInterval(250);

 Bluefruit.Central.setDisconnectCallback(disconnect_callback);
 Bluefruit.Central.setConnectCallback(connect_callback);


 Bluefruit.Scanner.setRxCallback(scan_callback);
 Bluefruit.Scanner.restartOnDisconnect(true);
 Bluefruit.Scanner.setInterval(160, 80); // in unit of 0.625 ms
 Bluefruit.Scanner.filterUuid(hrms.uuid);
 Bluefruit.Scanner.useActiveScan(false);
 Bluefruit.Scanner.start(0); // // 0 = Don't stop scanning after n seconds
}

void loop()
{
 // do nothing
}


void scan_callback(ble_gap_evt_adv_report_t* report)
{

 Bluefruit.Central.connect(report);
}


void connect_callback(uint16_t conn_handle)
{
 Serial.println("Connected");
 Serial.print("Discovering HRM Service ... ");

 if ( !hrms.discover(conn_handle) )
 {
 Serial.println("Found NONE");

 // disconnect since we couldn't find HRM service
 Bluefruit.disconnect(conn_handle);

 return;
 }

 Serial.println("Found it");
 
 Serial.print("Discovering Measurement characteristic ... ");
 if ( !hrmc.discover() )
 {
 Serial.println("not found !!!"); 
 Serial.println("Measurement characteristic is mandatory but not found");
 Bluefruit.disconnect(conn_handle);
 return;
 }
 Serial.println("Found it");


 Serial.print("Discovering Body Sensor Location characteristic ... ");
 if ( bslc.discover() )
 {
 Serial.println("Found it");
 
 const char* body_str[] = { "Other", "Chest", "Wrist", "Finger", "Hand", "Ear Lobe", "Foot" };

 uint8_t loc_value = bslc.read8();
 
 Serial.print("Body Location Sensor: ");
 Serial.println(body_str[loc_value]);
 }else
 {
 Serial.println("Found NONE");
 }

 if ( hrmc.enableNotify() )
 {
 Serial.println("Ready to receive HRM Measurement value");
 }else
 {
 Serial.println("Couldn't enable notify for HRM Measurement. Increase DEBUG LEVEL for troubleshooting");
 }
}


void disconnect_callback(uint16_t conn_handle, uint8_t reason)
{
 (void) conn_handle;
 (void) reason;

 Serial.println("Disconnected");
}

void hrm_notify_callback(BLEClientCharacteristic* chr, uint8_t* data, uint16_t len)
{


 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]);
 }
} 
 the only respond I have is 
 Bluefruit52 Central Custom CSC Example
-------------------------------------- 
 I don't receive any data in the serial monitor. 
 is someone could help me ? 
 regards