CircuitPython Code: Web Bluetooth in p5js with Adafruit Circuit Playground Bluefruit (UART)

code.py

# SPDX-FileCopyrightText: 2020 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

# Web Bluetooth in p5js with Adafruit Circuit Playground Bluefruit (UART)
# https://editor.p5js.org/mjvo/sketches/vcoGZWBax

import board
import time

from adafruit_ble import BLERadio
from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
from adafruit_ble.services.nordic import UARTService

ble = BLERadio()
uart_service = UARTService()
advertisement = ProvideServicesAdvertisement(uart_service)


while True:
    # Advertise when not connected.
    ble.start_advertising(advertisement)
    while not ble.connected:
        pass
    ble.stop_advertising()

    while ble.connected:
        s = uart_service.readline()
        if s:
            try:
                result = str(eval(s))
            except Exception as e:
                result = repr(e)
            print(s)
            result = "Msg from Bluefruit"
            uart_service.write(result.encode("utf-8"))