def __init__(self):

print("Started webledbut")

self.thread = None

#to disable RuntimeWarning: This channel is already in use

GPIO.setwarnings(False)

GPIO.setmode(GPIO.BCM)

GPIO.setup(23, GPIO.OUT)

GPIO.output(23, GPIO.LOW)

GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)

app = Flask(__name__)

Bootstrap(app)

app.config['DEBUG'] = False

self.socketio = SocketIO(app, async_mode='eventlet')

self.counter = 0

print('Begin thread')

if self.thread is None:

print('create thread')

thread = Thread(target=self.background_thread)

thread.daemon = True

thread.start()

@app.before_first_request

def initialize():

print('Called only once, when the first request comes in')

@app.route('/')

def index():

print("render index.html")

return render_template("index.html", board="Raspberry Pi")

@self.socketio.on('connect', namespace='/test')

def test_connect():

self.counter += 1

print("Counter= {0}".format(self.counter))

print('Client connected')

@self.socketio.on('disconnect', namespace='/test')

def test_disconnect():

self.counter -= 1

print("Counter= {0}".format(self.counter))

print('Client disconnected')

@self.socketio.on('getVersion', namespace='/test')

def getversion():

print('version')

@self.socketio.on('ledRCtrl', namespace='/test')

def ledrctrl(message):

print(message['led'])

GPIO.output(23, GPIO.HIGH if message['led'] else GPIO.LOW)

self.socketio.run(app, host='0.0.0.0', port=5001)

def background_thread(self):

state = True

while True:

newstate = False if GPIO.input(18) else True

if state != newstate:

state = newstate

print('Button', state)

self.socketio.emit('but', {'state': state}, namespace='/test')