diff --git a/RPi_Client/CoAPthon3/coapclient.py b/RPi_Client/CoAPthon3/coapclient.py
index 2bb67af110730f74b0df7f8c0ae2f50f0abdc8e1..622317e36602f98c590ec661a4012a6de5d3b642 100644
--- a/RPi_Client/CoAPthon3/coapclient.py
+++ b/RPi_Client/CoAPthon3/coapclient.py
@@ -154,7 +154,7 @@ class CoapClient():
         if distance < h:
             ad = 0
         else:
-            ad = sqrt(distance * distance - h * h)
+            ad = math.sqrt(distance * distance - h * h)
 
         payload = {
             'rpuuid' : self.myuuid,
diff --git a/Server_CoAP/CoAPthon3/exampleresources.py b/Server_CoAP/CoAPthon3/exampleresources.py
index 07b0e9179ff2fb526098669faf74af6204f9e415..cba1937abc044b842bb68ad6f90415b9088f9a3a 100644
--- a/Server_CoAP/CoAPthon3/exampleresources.py
+++ b/Server_CoAP/CoAPthon3/exampleresources.py
@@ -50,7 +50,6 @@ class RpNodeInfoResource(Resource):
         return self, response
 
     def postRpNodeInfoInDB(self, info): # complete
-        info = info['rpMAC']
         cursor = self.collection.find({'rpMAC' : info['rpMAC']})
         if len(list(cursor)) == 1:
             rpuuid = cursor[0]['rpuuid']