String compare = "fd05a570-274a-4b1f-a5a3-eb52e5e02b8b";
void setup() {
 Serial.begin(115200);
 while (!Serial);
 // begin initialization
 if (!BLE.begin()) {
 Serial.println("starting BLE failed!");
 while (1);
 }
 //BLE.debug(Serial);
 Serial.println("BLE Central - Peripheral Explorer");
 // start scanning for peripherals
 //BLE.debug(Serial1);
 BLE.scan(true);
}
void loop() {
 // check if a peripheral has been discovered
 BLEDevice peripheral = BLE.available();
 if (peripheral)
 {
 Serial.print("Found ");
 Serial.print(peripheral.address());
 Serial.print(" '");
 Serial.print(peripheral.localName());
 Serial.print("' ");
 Serial.print(peripheral.advertisedServiceUuid());
 Serial.print("' ");
 Serial.print("RSSI :");
 Serial.println(peripheral.rssi());
 String compare = "fd05a570-274a-4b1f-a5a3-eb52e5e02b8b";
 if (peripheral.rssi() > -55)
 {
 String compare = "fd05a570-274a-4b1f-a5a3-eb52e5e02b8b";
 if (peripheral.advertisedServiceUuid() == compare)
 {
 BLE.stopScan();
 explorerPeripheral(peripheral);
 BLE.scan(true);
 }
 }
 }
}
void explorerPeripheral(BLEDevice peripheral) {
 // connect to the peripheral
 Serial.println("Connecting ...");
 if (peripheral.connect())
 {
 Serial.println("Connected");
 }
 else
 {
 Serial.println("Failed to connect!");
 return;
 }
 // discover peripheral attributes
 Serial.println("Discovering attributes ...");
 if (peripheral.discoverAttributes()) {
 Serial.println("Attributes discovered");
 } else {
 Serial.println("Attribute discovery failed!");
 peripheral.disconnect();
 return;
 }
 // read and print device name of peripheral
 Serial.println();
 Serial.print("Device name: ");
 Serial.println(peripheral.deviceName());
 Serial.print("Appearance: 0x");
 Serial.println(peripheral.appearance(), HEX);
 Serial.println();
 // loop the services of the peripheral and explore each
 for (int i = 0; i < peripheral.serviceCount(); i++)
 {
 BLEService service = peripheral.service(i);
 exploreService(service);
 }
 Serial.println();
 // we are done exploring, disconnect
 Serial.println("Disconnecting ...");
 peripheral.disconnect();
 Serial.println("Disconnected");
}
void exploreService(BLEService service) {
 // print the UUID of the service
 Serial.print("Service ");
 Serial.println(service.uuid());
 String comp = "fd05a570-274a-4b1f-a5a3-eb52e5e02b8b";
 if (service.uuid() == comp)
 {
 // loop the characteristics of the service and explore each
 for (int i = 0; i < service.characteristicCount(); i++) {
 BLECharacteristic characteristic = service.characteristic(i);
 exploreCharacteristic(characteristic);
 }
 }
}
void exploreCharacteristic(BLECharacteristic characteristic) {
 // print the UUID and properties of the characteristic
 Serial.print("\tCharacteristic ");
 Serial.print(characteristic.uuid());
 Serial.print(", properties 0x");
 Serial.print(characteristic.properties(), HEX);
 // check if the characteristic is readable
 if (characteristic.canRead()) {
 // read the characteristic value
 characteristic.read();
 if (characteristic.valueLength() > 0) {
 // print out the value of the characteristic
 Serial.print(", value 0x");
 printData(characteristic.value(), characteristic.valueLength());
 characteristic.writeValue((byte)0x01);
 }
 }
 Serial.println();
}
void exploreDescriptor(BLECharacteristic characteristic) {
 if (characteristic.canRead()) {
 characteristic.read();
 if (characteristic.valueLength() > 0) {
 Serial.print("Value: ");
 printData(characteristic.value(), characteristic.valueLength());
 characteristic.writeValue((byte)0x01);
 }
 }
 Serial.println();
 // // print the UUID of the descriptor
 // Serial.print("\t\tDescriptor ");
 // Serial.println(descriptor.uuid());
 // // read the descriptor value
 // descriptor.read();
 // // print out the value of the descriptor
 // Serial.print("value:");
 // printData(descriptor.value(), descriptor.valueLength());
 // Serial.println();
}
void printData(const unsigned char data[], int length)
{
 for (int i = 0; i < length; i++)
 {
 unsigned char b = data[i];
 if (b < 16) {
 Serial.print("0");
 }
 Serial.print(String((char)b));
 }
}