Android Question buffer to text

Sub AStreams_NewData (Buffer() As Byte)
    Dim msg As String
 
   If msg.StartsWith ("S1") Then
       msg = BytesToString(Buffer, 0, 3, "UTF8") 
     
       Dim s1 As Int = msg
       Label1.Text = msg
    End If
       If msg.StartsWith ("S2") Then
           msg = BytesToString(Buffer, 0, 3, "UTF8")
 
       Dim s2 As Int = msg
       Label2.Text = s2
         
       End If
 
     
End Sub