receive_sms.py

import os
from flask import Flask, request, redirect
from twilio.twiml.messaging_response import MessagingResponse

app = Flask(__name__)

@app.route("/sms", methods=['GET','POST'])
def sms_reply():
    resp = MessagingResponse()

    resp.message("The Robots are coming! Head for the hills")

    return str(resp)

if __name__ == "__main__":
    app.run(debug=True)