Hey guys,
i successfully connected my Arduino 33 BLE with my Android device. Therefore I am simply using the example Arduino 33 BLE -> Central -> PeriphalExplorer. I want to set a value on my phone and work with it on the Arduino. When i use characteristic.value() I can get the set value but in an uint8_t format. Now i am trying to convert it into an integer but it doesnt work. There are only a few people asking the same question and the answer is always "simply assign it". If i do so I get "536967856" for the value 3. How does it work? Let me know if you need more information.
Thx guys 
#include <ArduinoBLE.h>
void setup() {
Serial.begin(9600);
while (!Serial);
// begin initialization
if (!BLE.begin()) {
Serial.println("starting BLE failed!");
while (1);
}
Serial.println("BLE Central - Peripheral Explorer");
// start scanning for peripherals
BLE.scan();
}
void loop() {
// check if a peripheral has been discovered
BLEDevice peripheral = BLE.available();
if (peripheral) {
// discovered a peripheral, print out address, local name, and advertised service
Serial.print("Found ");
Serial.print(peripheral.address());
Serial.print(" '");
Serial.print(peripheral.localName());
Serial.print("' ");
Serial.print(peripheral.advertisedServiceUuid());
Serial.println();
// see if peripheral is a LED
if (peripheral.localName() == "FelixBLE") {
// stop scanning
BLE.stopScan();
explorerPeripheral(peripheral);
// peripheral disconnected, we are done
while (1) {
// do nothing
}
}
}
}
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());
// 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());
}
}
Serial.println();
// loop the descriptors of the characteristic and explore each
for (int i = 0; i < characteristic.descriptorCount(); i++) {
BLEDescriptor descriptor = characteristic.descriptor(i);
exploreDescriptor(descriptor);
}
}
void exploreDescriptor(BLEDescriptor descriptor) {
// print the UUID of the descriptor
Serial.print("\t\tDescriptor ");
Serial.print(descriptor.uuid());
// read the descriptor value
descriptor.read();
// print out the value of the descriptor
Serial.print(", value 0x");
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(b, HEX);
}
}
