From 12e268e5f8edea28077675f4073d1c760b6edceb Mon Sep 17 00:00:00 2001
From: Diego Tellez <68343702+dtellz@users.noreply.github.com>
Date: Mon, 3 Jan 2022 11:49:53 +0000
Subject: [PATCH] fix: avoid gateway time out

As a solution to https://www.udemy.com/course/raspberry-pi-full-stack-raspbian/learn/lecture/9523532#questions/13165812 . It made it work for me in previus versions of the script.
---
 lab_app_final.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lab_app_final.py b/lab_app_final.py
index 22676f3..d93df5d 100644
--- a/lab_app_final.py
+++ b/lab_app_final.py
@@ -62,6 +62,8 @@
 
 app         = Flask(__name__)
 app.debug   = True # Make this False if you are no longer debugging
+dhtDevice = adafruit_dht.DHT22(board.D17) #This needs to be initialized outside of the route function in order to avoid a Gateway-Time-out 504 error.
+
 
 @app.route("/")
 def hello():
@@ -71,7 +73,7 @@ def hello():
 def lab_temp():
 	#import sys
 	#import Adafruit_DHT
-        dhtDevice = adafruit_dht.DHT22(board.D17)
+        
         temperature = dhtDevice.temperature
         humidity = dhtDevice.humidity
         #humidity, temperature = Adafruit_DHT.read_retry(Adafruit_DHT.AM2302, 17)