adding files for the commit

kano_wand/wand_utils.py

@@ -1,13 +1,21 @@
 from kano_wand.constants import *
 
-async def start_notify(client, notification_handler):
-    for char in CHARACTERISTIC_UUIDS.keys():
-        await client.start_notify(char, notification_handler)
+async def start_notify(client, notification_handler, sensors):
+    for char in sensors:
+        await client.start_notify(CHARACTERISTIC_UUIDS[char], notification_handler)
 
 
-async def stop_notify(client):
-    for char in CHARACTERISTIC_UUIDS.keys():
-        await client.stop_notify(char)
+async def stop_notify(client, sensors):
+    for char in sensors:
+        await client.stop_notify(CHARACTERISTIC_UUIDS[char])
 
 def chunker(seq, size):
     return (seq[pos:pos + size] for pos in range(0, len(seq), size))
+
+
+def get_key(val, dictionary):
+    for key, value in dictionary.items():
+        if val == value:
+            return key
+
+    return "key doesn't exist"