Correct early requests

examples/DS18B20_DHT22/DS18B20_DHT22.ino

@@ -47,15 +47,21 @@ void owRcv( OneWireSlave::ReceiveEvent evt, byte cmd ){
 	switch( evt ){
 	case OneWireSlave::RE_Reset:
 		state = DeviceState::WAIT4COMMAND;
+#ifdef DEBUG
+		Serial.println(F("Reset"));
+#endif
 		break;
 	case OneWireSlave::RE_Error:
 		state = DeviceState::WAIT4RESET;
+#ifdef DEBUG
+		Serial.println(F("Error"));
+#endif
 		break;
 	case OneWireSlave::RE_Byte:
 		switch( cmd ){
 		case OW_Cmd::START_CONVERSION:
 				// Do a new request only if enough time passed
-			if( millis() < conversionStartTime || millis() > conversionStartTime + 2000 ){
+			if( !millis() || millis() < conversionStartTime || millis() > conversionStartTime + 2000 ){
 				state = DeviceState::CONVERTING;
 				OWSlave.beginWriteBit(0, true); // send zeros as long as the conversion is not finished
 			}