diff --git a/RPi_Client/CoAPthon3/coapclient.py b/RPi_Client/CoAPthon3/coapclient.py
index bdb486137e2653a30869c87e436427cf0a83301c..5cf5086646daffe1b88080bb8fdb56e537e3a392 100644
--- a/RPi_Client/CoAPthon3/coapclient.py
+++ b/RPi_Client/CoAPthon3/coapclient.py
@@ -177,6 +177,7 @@ class CoapClient():
         distance = math.pow(10, (float(info[4]) - float(info[5])) / (10 * n))
         payload = {
             'rpuuid' : self.myuuid,
+            'userMAC' : info[0],
             'useruuid' : info[1],
             'distance' : distance,
             'updateTime' : time.time()