added xml transfer. Only testet download

app.py

@@ -1,8 +1,9 @@
 #!/usr/bin/python3
 
-from flask import request
+from flask import request, send_from_directory
 from flask_api import FlaskAPI
 import RPi.GPIO as GPIO
+import os
 
 from xml_reader import Xml_reader
 from interface_handler import Interface_handler
@@ -21,6 +22,30 @@ def api_root():
              "device_url_POST": {"output": "<value>"}
                  }
 
+@app.route('/XML', methods=["GET","POST"])
+def xml_transfer():
+    try:
+        #return the current config.xml
+        if request.method == "GET":
+            return send_from_directory('XML','config.xml')
+
+        # set a new config.xml
+        if request.method == "POST":
+            if 'config.xml' not in request.files:
+                raise ReferenceError("no file part")
+            file = request.files["config.xml"]
+            if file.filename != 'config.xml':
+                raise NameError("the file recieved does not have the filename config.xml")
+            file.save('/tmp/aped_device/config.xml')
+            #check config.xml against the XSD file
+            if xml_reader.validate('/tmp/aped_device/config.xml','XML/config.xsd'):
+                os.replace('XML/config.xml','XML/config_old.xml')
+                os.replace('/tmp/aped_device/config.xml','XML/config.xml')
+            else:
+                SyntaxError('the config.xml has invalid content')
+    except Exception as e:
+        return {'error' : str(e)}
+  
 @app.route('/device/<device_name>/', methods=["GET", "POST"])
 def api_leds_control(device_name):
     try: