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ManualsBrandsAdafruit ManualsAdafruitFeather nRF52 Bluefruit LE

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Serial.println("Bluefruit52 Central Custom HRM Example");

Serial.println("--------------------------------------\n");

// Initialize Bluefruit with maximum connections as Peripheral = 0, Central = 1

// SRAM usage required by SoftDevice will increase dramatically with number of connections

Bluefruit.begin(0, 1);

Bluefruit.setName("Bluefruit52 Central");

// Initialize HRM client

hrms.begin();

// Initialize client characteristics of HRM.

// Note: Client Char will be added to the last service that is begin()ed.

bslc.begin();

// set up callback for receiving measurement

hrmc.setNotifyCallback(hrm_notify_callback);

hrmc.begin();

// Increase Blink rate to different from PrPh advertising mode

Bluefruit.setConnLedInterval(250);

// Callbacks for Central

Bluefruit.Central.setDisconnectCallback(disconnect_callback);

Bluefruit.Central.setConnectCallback(connect_callback);

/* Start Central Scanning

* - Enable auto scan if disconnected

* - Interval = 100 ms, window = 80 ms

* - Don't use active scan

* - Filter only accept HRM service

* - Start(timeout) with timeout = 0 will scan forever (until connected)

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

}

/**

* Callback invoked when scanner pick up an advertising data

* @param report Structural advertising data

void scan_callback(ble_gap_evt_adv_report_t* report)

{

// Connect to device with HRM service in advertising

Bluefruit.Central.connect(report);

}

/**

* Callback invoked when an connection is established