diff --git a/pyren3/mod_ddt_ecu.py b/pyren3/mod_ddt_ecu.py
index 1df4bd3..e2cb723 100644
--- a/pyren3/mod_ddt_ecu.py
+++ b/pyren3/mod_ddt_ecu.py
@@ -237,7 +237,7 @@ class DDTECU():
     
     '''      0         1         2         3         4         5         6         7      '''
     '''      01234567890123456789012345678901234567890123456789012345678901234567890123456'''
-    #IdRsp = '61 80 34 36 33 32 52 45 34 42 45 30 30 33 37 52 00 83 9D 00 1A 90 01 01 00 88 AA'
+    IdRsp = '61 80 34 36 33 32 52 45 34 42 45 30 30 33 37 52 00 83 9D 00 1A 90 01 01 00 88 AA'
     '''                           -- --------                ----- -----                  '''
     '''              DiagVersion--+      |                     |     +--Version           '''
     '''                        Supplier--+                     +--Soft                    '''
@@ -1130,6 +1130,48 @@ def minDist(a, b):
 
   return d
 
+def distance( a, b ):
+  """ calculate distance between strings """
+  """ normalized to length of string     """
+  """ a - readen value                   """
+  """ b - pattern from eculist           """
+
+  d = 0
+
+  # align length
+  if len( a ) < len( b ):
+    a = a + ' ' * ( len( b ) - len( a ))
+  else:
+    b = b + ' ' * ( len( a ) - len( b ))
+
+  # humming distance 
+  l = len(a)
+  for i in range(0, l):
+    if b[i] != '?' and ord(a[i]) != ord(b[i]):
+      d = d + 1
+  
+  # normalize to length of string
+  if d:
+    d = d / l
+
+  return d
+
+def AutoIdents_distance( DiagVersion, Supplier, Soft, Version, ai ):
+
+  #normalize supplier in such cases
+  #DiagVersion="12" Supplier="746" Soft="2470" Version="A600"
+	#DiagVersion="12" Supplier="39324d" Soft="0052" Version="0400"
+  if  len( ai['Supplier'] ) == 6 and \
+      len( ai['Soft'] ) == 4 and \
+      len( ai['Version'] ) == 4:
+    ai['Supplier'] = bytes.fromhex(ai['Supplier']).decode('utf-8')
+    
+  d = distance( DiagVersion, ai['DiagVersion']) * 0.25
+  d = d + distance( Supplier, ai['Supplier']) * 0.25
+  d = d + distance( Soft, ai['Soft']) * 0.25
+  d = d + distance( Version, ai['Version']) * 0.25
+
+  return round( d, 4 )
 
 def ecuSearch(vehTypeCode, Address, DiagVersion, Supplier, Soft, Version, el, interactive = True):
 
@@ -1148,11 +1190,12 @@ def ecuSearch(vehTypeCode, Address, DiagVersion, Supplier, Soft, Version, el, in
 
   for k in list(t.keys()):
     for ai in t[k]['AutoIdents']:
-      dist = 0
-      dist = dist + minDist(DiagVersion, ai['DiagVersion']) * 1000  # weight
-      dist = dist + minDist(Supplier, ai['Supplier']) * 1  # weight
-      dist = dist + minDist(Soft, ai['Soft']) * 1  # weight
-      dist = dist + minDist(Version, ai['Version']) * 1  # weight
+      #dist = 0
+      #dist = dist + minDist(DiagVersion, ai['DiagVersion']) * 1000  # weight
+      #dist = dist + minDist(Supplier, ai['Supplier']) * 1  # weight
+      #dist = dist + minDist(Soft, ai['Soft']) * 1  # weight
+      #dist = dist + minDist(Version, ai['Version']) * 1  # weight
+      dist = AutoIdents_distance( DiagVersion, Supplier, Soft, Version, ai )
 
       if vehTypeCode in t[k]['Projects'] or dist == 0:
         if k not in list(cand.keys()): cand[k] = 0xFFFFFFFF
diff --git a/pyren3/mod_elm.py b/pyren3/mod_elm.py
index c7c9123..3e84d4d 100644
--- a/pyren3/mod_elm.py
+++ b/pyren3/mod_elm.py
@@ -160,7 +160,14 @@ class Port:
         
         portName = portName.strip ()
 
-        if re.match (r"^[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}$", portName):
+        MAC = None
+        upPortName = portName.upper()
+        if re.match (r"^[0-9A-F]{2}:[0-9A-F]{2}:[0-9A-F]{2}:[0-9A-F]{2}:[0-9A-F]{2}:[0-9A-F]{2}$", upPortName) or \
+           re.match (r"^[0-9A-F]{4}.[0-9A-F]{4}.[0-9A-F]{4}$", upPortName) or \
+           re.match (r"^[0-9A-F]{12}$", upPortName):
+            MAC = upPortName
+
+        if MAC:
             try:
                 self.macaddr = portName
                 self.channel = 1
@@ -187,7 +194,7 @@ class Port:
                 print(" \n\nERROR: Can't connect to WiFi ELM\n\n")
                 mod_globals.opt_demo = True
                 sys.exit()
-        elif mod_globals.os == 'android' and portName == 'bt':
+        elif mod_globals.os == 'android' and ( portName == 'bt' or MAC != None ):
             self.portType = 2
             self.droid = android.Android ()
             self.droid.toggleBluetoothState (True)
@@ -196,7 +203,10 @@ class Port:
                 time.sleep(1)
                 retry = retry + 1
                 try:
-                    self.btcid = self.droid.bluetoothConnect ('00001101-0000-1000-8000-00805F9B34FB').result
+                    if MAC == None:
+                        self.btcid = self.droid.bluetoothConnect ('00001101-0000-1000-8000-00805F9B34FB').result
+                    else:
+                        self.btcid = self.droid.bluetoothConnect (uuid='00001101-0000-1000-8000-00805F9B34FB', address=MAC).result
                 except:
                     pass
                 print( 'Try ',retry, ":", self.btcid )
@@ -1327,6 +1337,8 @@ class ELM:
             self.l1_cache[command] = str(hex(nframes))[2:].upper()
         
         if len (result) // 2 >= nbytes and noerrors:
+            # trim padding
+            result = result[:nbytes*2]
             # split by bytes and return
             result = ' '.join (a + b for a, b in zip (result[::2], result[1::2]))
             return result
@@ -1592,6 +1604,8 @@ class ELM:
             self.l1_cache[init_command] = str(nFrames)
 
         if noerrors and len(result) // 2 >= nBytes:
+            # trim padding
+            result = result[:nBytes*2]
             # split by bytes and return
             result = ' '.join(a + b for a, b in zip(result[::2], result[1::2]))
             return result
@@ -1811,6 +1825,8 @@ class ELM:
             noErrors = False
 
         if len (result) // 2 >= nBytes and noErrors and result[:2] != '7F':
+            # trim padding
+            result = result[:nBytes*2]            
             # split by bytes and return
             result = ' '.join (a + b for a, b in zip (result[::2], result[1::2]))
             return result