gate.py

from flask import Flask
import RPi.GPIO as GPIO

channel = 21

# GPIO setup
GPIO.setmode(GPIO.BCM)
GPIO.setup(channel, GPIO.OUT)

app = Flask(__name__)


# these shouldn't really be GET, idempotency etc. 
@app.route('/api/gate/activate')
def open_gate():
    GPIO.output(pin, GPIO.HIGH) # activate the gate
    
@app.route('/api/gate/deactivate')
def open_gate():
    GPIO.output(pin, GPIO.LOW) # deactivate the gate