yostane

let dwi = DispatchWorkItem {
    for i in 1...5 {
        print("DispatchWorkItem \(i)")
    }
}
//perform on the current thread
dwi.perform()
//perpform on the global queue
DispatchQueue.global().async(execute: dwi)

yostane

let dq = DispatchQueue(label: "my dispatch queue")
dq.async {
    print ("hello")
}

yostane

DispatchQueue.concurrentPerform(iterations: 5) { (i) in
    print(i)
}

yostane

DispatchQueue.main.async {
    for i in 1...5 {
        print("main async \(i)")
    }
}

yostane

DispatchQueue.global(qos: .background).async {
    for i in 1...5 {
        print("global async \(i)")
    }
}
DispatchQueue.global(qos: .userInteractive).async {
    for i in 1...5 {
        print("global async 2 \(i)")
    }

yostane

//two concurrent loops
DispatchQueue.global().async {
    for i in 1...5 {
        print("global async \(i)")
    }
}
DispatchQueue.global().async {
    for i in 1...5 {
        print("global async 2 \(i)")
    }

yostane

void writeToBLE(const char *value) {
  Serial.print("Writing :");
  Serial.println(value);
  mySerial.write(value, strlen(value));
}

yostane

char j = 0;
void loop() {
  float temp = readTemperature();
  char strFloat[20];
  dtostrf(temp, 2, 2, strFloat);
  writeToBLE(strFloat);
  j += 1;
  delay(2000);
}

yostane

float readTemperature() {
  int reading = analogRead(sensorPin);
  float voltage = (reading * aref_voltage) / 1024;
  Serial.print(voltage); 
  Serial.println(" volts");
  
  float temperatureC = voltage / 10 ;  
  Serial.print(temperatureC); Serial.println(" degrees C");
  
  float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0;

yostane

char j = 0;
void loop() {
  writeToBLE(j);
  j += 1;
  delay(500);
}