Compatibility issue with Python3 (#109)

ip_address.encode()

Author: ericonetto

snap7/logo.py

@@ -256,7 +256,7 @@ def set_connection_params(self, ip_address, tsap_snap7, tsap_logo):
         :param tsap_logo: TSAP Logo Server (e.g. 20.00 = 0x2000)
         """
         assert re.match(ipv4, ip_address), '%s is invalid ipv4' % ip_address
-        result = self.library.Cli_SetConnectionParams(self.pointer, ip_address,
+        result = self.library.Cli_SetConnectionParams(self.pointer, ip_address.encode(),
                                                       c_uint16(tsap_snap7),
                                                       c_uint16(tsap_logo))
         if result != 0: