import time

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

ble = BLERadio()

def scan():
    print("disconnected, scanning")
    for advertisement in ble.start_scan(ProvideServicesAdvertisement, timeout=1):
        if not advertisement.complete_name.startswith('Feather'):
            continue

        ble.connect(advertisement)
        print("connected to", advertisement.complete_name)
        break
    ble.stop_scan()

def read(connection):
    uart = connection[UARTService]
    if uart.in_waiting:
        res = uart.read(uart.in_waiting)
        print(res)

def loop():
    while True:
        while ble.connected:
            for connection in ble.connections:
                try:
                    read(connection)
                except bleak.exc.BleakError:
                    print('Disconnected, waiting 3 seconds and trying to reconnect...')
                    connection.disconnect()
                    time.sleep(3)

                time.sleep(0.1)

        scan()

if __name__ == '__main__':
    loop()