问如何通过蓝牙在Raspberry Pi 4和Arduino Nano BLE之间进行读写？

EN

import bluepy.btle as btle
p = btle.Peripheral("de:fc:54:87:b0:04")
services=p.getServices()
s = p.getServiceByUUID(list(services)[2].uuid)
c = s.getCharacteristics()[0]
c.write(bytes("2", "utf-8"))
p.disconnect()

#include <ArduinoBLE.h>

BLEService ledService("19B10000-E8F2-537E-4F6C-D104768A1214"); // BLE LED Service
// BLE LED Switch Characteristic - custom 128-bit UUID, read and writable by central
BLEByteCharacteristic switchCharacteristic("19B10001-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite);

const int ledPin = LED_BUILTIN; // pin to use for the LED

void setup() {
  Serial.begin(9600);
  while (!Serial);
  // set LED pin to output mode
  pinMode(ledPin, OUTPUT);
  // begin initialization
  if (!BLE.begin()) {
    Serial.println("starting BLE failed!");
    while (1);
  }
  // set advertised local name and service UUID:
  BLE.setLocalName("LED");
  BLE.setAdvertisedService(ledService);
  // add the characteristic to the service
  ledService.addCharacteristic(switchCharacteristic);
  // add service
  BLE.addService(ledService);
  // set the initial value for the characeristic:
  switchCharacteristic.writeValue(0);
  // start advertising
  BLE.advertise();
  Serial.println("BLE LED Peripheral");
}

void loop() {
  // listen for BLE peripherals to connect:
  BLEDevice central = BLE.central();
  // if a central is connected to peripheral:
  if (central) {
    Serial.print("Connected to central: ");
    //prints the centrals MAC address:
    Serial.println(central.address());
    // while the central is still connected to peripheral:
    while (central.connected()) {
      // if the remote device wrote to the characteristic,
      // use the value to control the LED:
      if (switchCharacteristic.written()) {
        if (switchCharacteristic.value()) { // any value other than 0
          Serial.println("LED on");
          digitalWrite(ledPin, HIGH); // will turn the LED on
        } else { // a 0 value
          Serial.println(F("LED off"));
          digitalWrite(ledPin, LOW); // will turn the LED off
        }
      }
    }
    // when the central disconnects, print it out:
    Serial.print(F("Disconnected from central: "));
    Serial.println(central.address());
  }
}