Merge pull request arduino#431 from maxtox/patch-2

When receiving a number of messages, string might include old Data

Author: henrikekblad

libraries/MySensors/core/MyGatewayTransportEthernet.cpp

@@ -265,11 +265,13 @@ bool gatewayTransportAvailable()
 			//debug(PSTR("UDP packet available. Size:%d\n"), packet_size);
 			#if defined(MY_GATEWAY_ESP8266)
 				_ethernetServer.read(inputString[0].string, MY_GATEWAY_MAX_RECEIVE_LENGTH);
+				inputString[0].string[packet_size] = 0;
 				debug(PSTR("UDP packet received: %s\n"), inputString[0].string);
 				return protocolParse(_ethernetMsg, inputString[0].string);
 			#else
 				_ethernetServer.read(inputString.string, MY_GATEWAY_MAX_RECEIVE_LENGTH);
 				_w5100_spi_en(false);
+				inputString.string[packet_size] = 0;
 				debug(PSTR("UDP packet received: %s\n"), inputString.string);
 				return protocolParse(_ethernetMsg, inputString.string);
 			#endif