#include <ArduinoBLE.h>

//vars
float x = 185.3;
unsigned long lgUpdateTime;
#define BLEService weightService("0000181d-0000-1000-8000-00805f9b34fb");
#define BLEFloatCharacteristic weight("00002a9d-0000-1000-8000-00805f9b34fb", BLERead | BLENotify);


void setup()
{
         Serial.begin(9600);

         // begin initialization
         if (!BLE.begin())
         {
               Serial.println("starting BLE failed!");

               while (1);
         }

         BLE.setLocalName("MH_Wgt_Scale");
         BLE.setAdvertisedService(weightService);
         weightService.addCharacteristic(weight);
         BLE.addService(weightService);
         weight.setValue(0.0);

         BLE.advertise();
         Serial.println("Bluetooth device active, waiting for connections...");

         lgUpdateTime = millis();
}

void loop()
{
         //Execute Comms every 2000 milli seconds
	     if(millis() - lgUpdateTime > 2000)
         {
               lgUpdateTime = millis();

               // wait for a BLE central
               BLEDevice central = BLE.central();

               // if a central is connected to the peripheral:
               if (central)
               {
                         Serial.println("Connected to central: ");

                         // print the central's BT address:
                         Serial.println(central.address());

                         digitalWrite(LED_BUILTIN, HIGH);

                         //central is connected:
                         if (central.connected())
                         {
                              x = x + 1;
                              Serial.print("The weight is: ");
                              Serial.println(x,2);

                              weight.writeValue(x,2);
                         }
               }
               else
               {
                         // when the central disconnects, turn off the LED:
                         digitalWrite(LED_BUILTIN, LOW);
                         Serial.println("Disconnected from central: ");
                         Serial.println(central.address());
               }
         }
}