diff --git a/MQTTSNGateway/README.md b/MQTTSNGateway/README.md
index 73afcad..4a0b5e5 100644
--- a/MQTTSNGateway/README.md
+++ b/MQTTSNGateway/README.md
@@ -32,6 +32,9 @@ BrokerSecurePortNo=8883
 
 ClientAuthentication=NO
 #ClientsList=/path/to/your_clients.conf    
+
+PredefinedTopic=NO
+#PredefinedTopicFile=/path/to/your_predefinedTopic.conf
     
 #RootCAfile=/path/to/your_Root_CA.crt    
 #RootCApath=/path/to/your_certs_directory/   
diff --git a/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp b/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
index 00bbb36..502a17d 100644
--- a/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
@@ -403,7 +403,7 @@ void XBee::setApiMode(uint8_t mode)
 SerialPort::SerialPort()
 {
 	_tio.c_iflag = IGNBRK | IGNPAR;
-	_tio.c_cflag = CS8 | CLOCAL | CRTSCTS;
+	_tio.c_cflag = CS8 | CLOCAL | CRTSCTS | CREAD;
 	_tio.c_cc[VINTR] = 0;
 	_tio.c_cc[VTIME] = 10;   // 1 sec.
 	_tio.c_cc[VMIN] = 1;
@@ -464,7 +464,7 @@ bool SerialPort::recv(unsigned char* buf)
     FD_SET(_fd, &rfds);
     timeout.tv_sec = 0;
     timeout.tv_usec = 500000;    // 500ms
-    if ( select(1, &rfds, 0, 0, &timeout) > 0 )
+    if ( select(_fd + 1, &rfds, 0, 0, &timeout) > 0 )
     {
         if (read(_fd, buf, 1) > 0)
         {