diff --git a/Pipfile b/Pipfile
index 99ed9fd..1344b7c 100644
--- a/Pipfile
+++ b/Pipfile
@@ -8,8 +8,9 @@ awsiotsdk = "*"
 boto3 = "*"
 opencv-python = "*"
 requests = "*"
+"rpi.gpio" = "*"
 
 [dev-packages]
 
 [requires]
-python_version = "3.10"
+python_version = "3.9"
diff --git a/lambda-detect-face.py b/lambda-detect-face.py
index b20b290..57ce759 100644
--- a/lambda-detect-face.py
+++ b/lambda-detect-face.py
@@ -48,6 +48,6 @@ def detect_faces(photo, bucket):
 def iot_publish(payload):
     iot_data.publish(
         topic=TOPIC,
-        qos=1,
+        qos=0,
         payload=json.dumps(payload)
-    )
\ No newline at end of file
+    )
diff --git a/lambda-gen-s3-url.py b/lambda-gen-s3-url.py
index c185e34..3a4bbf2 100644
--- a/lambda-gen-s3-url.py
+++ b/lambda-gen-s3-url.py
@@ -15,15 +15,15 @@ def lambda_handler(event, _context):
     filename = event['filename']
 
     try:
-        url = s3.generate_presigned_post(BUCKET, filename)
-        print("Got presigned URL: %s", url)
+        result = s3.generate_presigned_put(BUCKET, filename)
+        print("Got presigned URL: {}".format(result['url']))
     except ClientError as e:
         print(e)
         print("Couldn't get a presigned URL")
         raise e
 
     try:
-        iot_publish({ "url": url })
+        iot_publish(result)
     except Exception as e:
         print(e)
         print(f"Error while publishing to MQTT topic {TOPIC}.")
@@ -35,6 +35,6 @@ def lambda_handler(event, _context):
 def iot_publish(payload):
     iot_data.publish(
         topic=TOPIC,
-        qos=1,
+        qos=0,
         payload=json.dumps(payload)
-    )
\ No newline at end of file
+    )
diff --git a/led_control.py b/led_control.py
index 9c9a7a9..c32692a 100644
--- a/led_control.py
+++ b/led_control.py
@@ -26,7 +26,7 @@ LED_TOPIC = "cloudprog/hw4/team02/led"
 S3_UPLOAD_TOPIC = "cloudprog/hw4/team02/s3/upload"
 S3_URL_TOPIC = "cloudprog/hw4/team02/s3/url"
 
-FORMAT = "jpg"
+FORMAT = ".jpg"
 
 filename = None
 cam = cv2.VideoCapture(0)
@@ -95,24 +95,25 @@ def led_control(light):
 def parse_s3_url_payload(payload):
     data = json.loads(payload.decode())
 
-    post_presigned_s3_url(data["url"], take_picture())
+    post_presigned_s3_url(data, take_picture())
 
 
 def take_picture():
-    cam.open()
+    #cam.open()
     ret, frame = cam.read()
     ret, img = cv2.imencode(FORMAT, frame)
     cam.release()
     return img.tobytes()
 
 
-def post_presigned_s3_url(url, img_bytes):
-    res = requests.post(url, data=img_bytes)
+def post_presigned_s3_url(data, img_bytes):
+    fn = data['fields']['key']
+    res = requests.post(data['url'], data=data['fields'], files={ "file": (fn, img_bytes) })
     print(f"Put to S3. status code: {res.status_code}")
     return res
 
 
-async def main():
+async def main(loop):
     global filename
     # create MQTT connection
     mqtt_connection = mqtt_connection_builder.mtls_from_path(
@@ -133,7 +134,7 @@ async def main():
     # subscribe to MQTT topic
     subscribe_future, packet_id = mqtt_connection.subscribe(
         topic=LED_TOPIC,
-        qos=mqtt.QoS.AT_LEAST_ONCE,
+        qos=mqtt.QoS.AT_MOST_ONCE,
         callback=on_message_received
     )
 
@@ -143,7 +144,7 @@ async def main():
 
     subscribe_future, packet_id = mqtt_connection.subscribe(
         topic=S3_URL_TOPIC,
-        qos=mqtt.QoS.AT_LEAST_ONCE,
+        qos=mqtt.QoS.AT_MOST_ONCE,
         callback=on_message_received
     )
 
@@ -155,17 +156,18 @@ async def main():
         command = input("> ")
         
         if command == "p":
-            filename = datetime.datetime.strftime(datetime.datetime.now(), "%Y-%m-%d-%H-%M-%S") + "." + FORMAT
+            filename = datetime.datetime.strftime(datetime.datetime.now(), "%Y-%m-%d-%H-%M-%S") + FORMAT
             publish_future, packet_id = mqtt_connection.publish(
                 topic=S3_UPLOAD_TOPIC,
                 payload=json.dumps({ "filename": filename }),
-                qos=mqtt.QoS.AT_LEAST_ONCE
+                qos=mqtt.QoS.AT_MOST_ONCE
             )
             publish_result = publish_future.result()
             print(publish_result)
             print(f"Upload request {filename} sent!")
         elif command == "q":
             break
+    loop.stop()
 
 
 def handler(loop, context):
@@ -180,6 +182,6 @@ def handler(loop, context):
 loop = asyncio.get_event_loop()
 loop.set_exception_handler(handler)
 
-loop.create_task(main())
+loop.create_task(main(loop))
 
 loop.run_forever()