===================================Py - Scan dispositivi BLE=================================
import asyncio
from bleak import BleakScanner

async def main():
    devices = await BleakScanner.discover()

    for device in devices:
        print(device)

asyncio.run(main())

===================================Risultato===================================================
44:7C:63:97:6D:3D: [TV] UE48|S8500
48:69:31:F1:1D:2D: [LG] webOS TV UP78006LB
5A:C1:D7:5C:BE:07: None
25:4B:03:3C:02:5F: None
F4:12:FA:6F:76:D9: R4


====================Py Stampa i servizi e le caratteristiche di un dispositivo BLE=================
import asyncio
from bleak import *

MAC = 'F4:12:FA:6F:76:D9'
async def bleGATT():
    client = BleakClient(MAC)
    await client.connect()
    for service in client.services:
            print("[Service] {0}: {1}".format(service.uuid, service.description))
            for char in service.characteristics:
                print("\t[characteristic] ", char)
                for prp in char.properties:
                    print ("\t\t[property] ",prp)  
    await client.disconnect()
asyncio.run(bleGATT())

===============Risultato=================================================================
[Service] 00001800-0000-1000-8000-00805f9b34fb: Generic Access Profile
	[characteristic]  00002a00-0000-1000-8000-00805f9b34fb (Handle: 2): Device Name
		[property]  read
	[characteristic]  00002a01-0000-1000-8000-00805f9b34fb (Handle: 4): Appearance
		[property]  read
[Service] 00001801-0000-1000-8000-00805f9b34fb: Generic Attribute Profile
	[characteristic]  00002a05-0000-1000-8000-00805f9b34fb (Handle: 7): Service Changed
		[property]  indicate
[Service] 19b10000-e8f2-537e-4f6c-d104768a1214: Unknown
	[characteristic]  19b10001-e8f2-537e-4f6c-d104768a1214 (Handle: 11): Unknown
		[property]  read
		[property]  write



====================Py Invio Dati e risposta=====================================================
#in caso di sent string controllare il max size sul ricevitore
async def bleWriteData(CUSTOM_SERVICE_CHAR_UUID,data):
    client = BleakClient(MAC)
    await client.connect()
    await client.write_gatt_char(CUSTOM_SERVICE_CHAR_UUID,data=data)
	value = await client.read_gatt_char(CUSTOM_SERVICE_CHAR_UUID)###...se voglio la risposta dal device
    print(value)												 ###
    await client.disconnect()
asyncio.run(bleWriteData("19B10001-E8F2-537E-4F6C-D104768A1214",b"hello"))

============================Risultato=========================================
Disconnected From central: 3c:a0:67:8f:e2:5a
Connected to central: 3c:a0:67:8f:e2:5a
Disconnected From central: 3c:a0:67:8f:e2:5a
Connected to central: 3c:a0:67:8f:e2:5a
hello
Disconnected From central: 3c:a0:67:8f:e2:5a
Connected to central: 3c:a0:67:8f:e2:5a
Disconnected From central: 3c:a0:67:8f:e2:5a
Connected to central: 3c:a0:67:8f:e2:5a
hello wo ###Ho superato la dimensione della caratteristica che era 8 caratteri
Disconnected From central: 3c:a0:67:8f:e2:5a

==========================Risultato=================================================
#include <ArduinoBLE.h>

// Define the name of the Bluetooth peripheral
const char* peripheralName = "R4";

// Create a BLE Service
BLEService fileTransferService("19B10000-E8F2-537E-4F6C-D104768A1214");

// Create a BLE Characteristic for receiving data
const char* dataCharacteristicUUID = "19B10001-E8F2-537E-4F6C-D104768A1214";
//BLECharacteristic dataCharacteristic(dataCharacteristicUUID, BLEWrite | BLERead, "");

//BLEByteCharacteristic dataCharacteristic(dataCharacteristicUUID, BLEWrite | BLERead);//Se voglio comunicare Bytes
BLEStringCharacteristic dataCharacteristic(dataCharacteristicUUID, BLEWrite | BLERead,8);//Se voglio comunicare Stringhe

void setup() {
  // Initialize the Serial communication for debugging
  Serial.begin(9600);

  // Initialize the BLE library
  if (!BLE.begin()) {
    Serial.println("Starting BLE failed!");
    while (1);
  }

  // Set the local name of the Bluetooth peripheral
  BLE.setLocalName(peripheralName);
  BLE.setAdvertisedService(fileTransferService);

  // Add the characteristics to the service
  fileTransferService.addCharacteristic(dataCharacteristic);
  // add service
  BLE.addService(fileTransferService);

    // set the initial value for the characteristic:
  //dataCharacteristic.writeValue(0);
  
  // Start advertising
  BLE.advertise();

  Serial.println("Bluetooth peripheral advertising...");
}

void printHex(uint8_t num) {
  char hexCar[2];

  sprintf(hexCar, "[%02X]", num);
  Serial.print(hexCar);
}

void loop() {
  BLEDevice central = BLE.central();
  if (central) {
    Serial.print("Connected to central: ");
    Serial.println(central.address());
	
	while (central.connected()) {
		if (dataCharacteristic.written()) {
			////dataCharacteristic.writeValue((byte)0x01);//Sevoglio rispondere con byte
			dataCharacteristic.writeValue("RESP"); //Rsipondo con stringa
			Serial.println( dataCharacteristic.value());	
		 }
	 }
     Serial.print(F("Disconnected From central: "));
     Serial.println(central.address());	 
  }
}