diff --git a/MQTTSNGateway/src/MQTTSNGWClientRecvTask.cpp b/MQTTSNGateway/src/MQTTSNGWClientRecvTask.cpp
index ccf6192..46100fa 100644
--- a/MQTTSNGateway/src/MQTTSNGWClientRecvTask.cpp
+++ b/MQTTSNGateway/src/MQTTSNGWClientRecvTask.cpp
@@ -45,10 +45,7 @@ ClientRecvTask::~ClientRecvTask()
  */
 void ClientRecvTask::initialize(int argc, char** argv)
 {
-    if (_sensorNetwork->initialize() < 0)
-    {
-        throw EXCEPTION(" Can't open the sensor network.\n", 0);
-    }
+    _sensorNetwork->initialize();
 }
 
 /*
diff --git a/MQTTSNGateway/src/MQTTSNGWProcess.cpp b/MQTTSNGateway/src/MQTTSNGWProcess.cpp
index 7cded4b..55bc475 100644
--- a/MQTTSNGateway/src/MQTTSNGWProcess.cpp
+++ b/MQTTSNGateway/src/MQTTSNGWProcess.cpp
@@ -336,19 +336,19 @@ int MultiTaskProcess::getParam(const char* parameter, char* value)
 /*=====================================
  Class Exception
  ======================================*/
-Exception::Exception(const char* message, const int exNo)
+Exception::Exception(const char* message, const int errNo)
 {
 	_message = message;
-    _exNo = exNo;
+    _errNo = errNo;
     _fileName = nullptr;
     _functionName = nullptr;
     _line = 0;
 }
-Exception::Exception(const char* message, const int exNo, const char* file,
+Exception::Exception(const char* message, const int errNo, const char* file,
         const char* function, const int line)
 {
 	_message = message;
-    _exNo = exNo;
+    _errNo = errNo;
     _fileName = getFileName(file);;
     _functionName = function;
     _line = line;
@@ -379,36 +379,35 @@ const int Exception::getLineNo()
     return _line;
 }
 
-const int Exception::getExceptionNo()
+const int Exception::getErrNo()
 {
-    return _exNo;
+    return _errNo;
 }
 
 void Exception::writeMessage()
 {
     if (_fileName == nullptr)
     {
-    	if (_exNo == 0)
+    	if (_errNo == 0)
     	{
-    		WRITELOG("%s %s\n", currentDateTime(), _message);
+    		WRITELOG("%s%s %s%s\n", currentDateTime(), RED_HDR, _message, CLR_HDR);
     	}
     	else
     	{
-
-    		WRITELOG("%s %s  ExNo: %d\n", currentDateTime(), _message, _exNo);
+    		WRITELOG("%s%s %s.\n                    errno=%d : %s%s\n", currentDateTime(), RED_HDR,_message, _errNo, strerror(_errNo), CLR_HDR);
     	}
     }
     else
     {
-    	if (_exNo == 0)
+    	if (_errNo == 0)
     	{
-    		WRITELOG("%s %s  line %-4d %s() : %s\n",
-    		    		    currentDateTime(), _fileName, _line, _functionName, _message);
+    		WRITELOG("%s%s %s.  %s line %-4d %s()%s\n",
+    		    		    currentDateTime(), RED_HDR, _message, _fileName, _line, _functionName, CLR_HDR);
     	}
     	else
     	{
-    		WRITELOG("%s %s  line %-4d %s() : %s  ExNo: %d\n",
-        		currentDateTime(), _fileName, _line, _functionName, _message, _exNo);
+        		WRITELOG("%s%s %s.  %s line %-4d %s()\n                    errno=%d : %s%s\n",
+        		currentDateTime(), RED_HDR, _message, _fileName, _line, _functionName, _errNo, strerror(_errNo), CLR_HDR);
     	}
     }
 }
diff --git a/MQTTSNGateway/src/MQTTSNGWProcess.h b/MQTTSNGateway/src/MQTTSNGWProcess.h
index be69da8..7827d59 100644
--- a/MQTTSNGateway/src/MQTTSNGWProcess.h
+++ b/MQTTSNGateway/src/MQTTSNGWProcess.h
@@ -103,19 +103,19 @@ private:
 class Exception: public exception
 {
 public:
-    Exception(const char* message, const int exNo);
-    Exception(const char* message, const int exNo, const char* file, const char* func, int line);
+    Exception(const char* message, const int errNo);
+    Exception(const char* message, const int errNo, const char* file, const char* func, int line);
     virtual ~Exception() throw ();
     const char* getFileName();
     const char* getFunctionName();
     const int getLineNo();
-    const int getExceptionNo();
+    const int getErrNo();
     virtual const char* what() const throw ();
     void writeMessage();
 
 private:
     const char* getFileName(const char* file);
-    int _exNo;
+    int _errNo;
     const char* _message;
     const char* _fileName;
     const char* _functionName;
diff --git a/MQTTSNGateway/src/linux/Threading.h b/MQTTSNGateway/src/linux/Threading.h
index 7969fdd..7a8f985 100644
--- a/MQTTSNGateway/src/linux/Threading.h
+++ b/MQTTSNGateway/src/linux/Threading.h
@@ -31,6 +31,9 @@ namespace MQTTSNGW
 #define MQTTSNGW_RB_MUTEX_KEY     "rbmutex.key"
 #define MQTTSNGW_RB_SEMAPHOR_NAME "/rbsemaphor"
 
+#define RED_HDR  "\033[0m\033[0;31m"
+#define CLR_HDR  "\033[0m\033[0;37m"
+
 /*=====================================
          Class Mutex
   ====================================*/
@@ -129,9 +132,8 @@ public: void EXECRUN() \
     } \
     catch ( Exception &ex ) \
     { \
-    	WRITELOG("\033[0m\033[0;31m"); \
         ex.writeMessage(); \
-        WRITELOG("\033[0m\033[0;37m%s caught an exception and stopped.\n", getTaskName()); \
+        WRITELOG("%s%s caught an exception and stopped.%s\n", RED_HDR, getTaskName(), CLR_HDR); \
         theMultiTaskProcess->abort(); \
     } \
     theMultiTaskProcess->threadStopped(); \
diff --git a/MQTTSNGateway/src/linux/loralink/SensorNetwork.cpp b/MQTTSNGateway/src/linux/loralink/SensorNetwork.cpp
index 854854c..fc7f8e0 100644
--- a/MQTTSNGateway/src/linux/loralink/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/loralink/SensorNetwork.cpp
@@ -119,7 +119,7 @@ int SensorNetwork::read(uint8_t* buf, uint16_t bufLen)
 	return LoRaLink::recv(buf, bufLen, &_clientAddr);
 }
 
-int SensorNetwork::initialize(void)
+void SensorNetwork::initialize(void)
 {
 	char param[MQTTSNGW_PARAM_MAX];
 	uint32_t baudrate = 115200;
@@ -135,15 +135,22 @@ int SensorNetwork::initialize(void)
 	theProcess->getParam("DeviceRxLoRaLink", param);
 	_description += ", SerialRx ";
 	_description += param;
+	errno = 0;
+
 	if ( LoRaLink::open(LORALINK_MODEM_RX, param, baudrate) < 0 )
 	{
-		return -1;
+		throw EXCEPTION("Can't open a LoRaLink", errno);
 	}
 
 	theProcess->getParam("DeviceTxLoRaLink", param);
 	_description += ", SerialTx ";
 	_description += param;
-	return LoRaLink::open(LORALINK_MODEM_TX, param, baudrate);
+	errno = 0;
+
+	if ( LoRaLink::open(LORALINK_MODEM_TX, param, baudrate) < 0 )
+	{
+		throw EXCEPTION("Can't open a LoRaLink", errno);
+	}
 }
 
 const char* SensorNetwork::getDescription(void)
diff --git a/MQTTSNGateway/src/linux/loralink/SensorNetwork.h b/MQTTSNGateway/src/linux/loralink/SensorNetwork.h
index 0565ff1..febfeda 100644
--- a/MQTTSNGateway/src/linux/loralink/SensorNetwork.h
+++ b/MQTTSNGateway/src/linux/loralink/SensorNetwork.h
@@ -173,7 +173,7 @@ public:
 	int unicast(const uint8_t* payload, uint16_t payloadLength, SensorNetAddress* sendto);
 	int broadcast(const uint8_t* payload, uint16_t payloadLength);
 	int read(uint8_t* buf, uint16_t bufLen);
-	int initialize(void);
+	void initialize(void);
 	const char* getDescription(void);
 	SensorNetAddress* getSenderAddress(void);
 
diff --git a/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp b/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp
index e96dca6..8a27510 100644
--- a/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/udp/SensorNetwork.cpp
@@ -177,9 +177,8 @@ int SensorNetwork::read(uint8_t* buf, uint16_t bufLen)
  *  Prepare UDP sockets and description of SensorNetwork like
  *   "UDP Multicast 225.1.1.1:1883 Gateway Port 10000".
  *   The description is for a start up prompt.
- *  @return success = 0, error = -1
  */
-int SensorNetwork::initialize(void)
+void SensorNetwork::initialize(void)
 {
 	char param[MQTTSNGW_PARAM_MAX];
 	uint16_t multicastPortNo = 0;
@@ -224,7 +223,11 @@ int SensorNetwork::initialize(void)
 	}
 
 	/*  Prepare UDP sockets */
-	return UDPPort::open(ip.c_str(), multicastPortNo, unicastPortNo, ttl);
+	errno = 0;
+	if ( UDPPort::open(ip.c_str(), multicastPortNo, unicastPortNo, ttl) < 0 )
+	{
+		throw EXCEPTION("Can't open a UDP", errno);
+	}
 }
 
 const char* SensorNetwork::getDescription(void)
diff --git a/MQTTSNGateway/src/linux/udp/SensorNetwork.h b/MQTTSNGateway/src/linux/udp/SensorNetwork.h
index 735a3c5..9fc9ce3 100644
--- a/MQTTSNGateway/src/linux/udp/SensorNetwork.h
+++ b/MQTTSNGateway/src/linux/udp/SensorNetwork.h
@@ -91,7 +91,7 @@ public:
 	int unicast(const uint8_t* payload, uint16_t payloadLength, SensorNetAddress* sendto);
 	int broadcast(const uint8_t* payload, uint16_t payloadLength);
 	int read(uint8_t* buf, uint16_t bufLen);
-	int initialize(void);
+	void initialize(void);
 	const char* getDescription(void);
 	SensorNetAddress* getSenderAddress(void);
 
diff --git a/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp b/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
index a0593f6..85acc2e 100644
--- a/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/udp6/SensorNetwork.cpp
@@ -169,7 +169,7 @@ int SensorNetwork::read(uint8_t* buf, uint16_t bufLen)
 	return UDPPort6::recv(buf, bufLen, &_clientAddr);
 }
 
-int SensorNetwork::initialize(void)
+void SensorNetwork::initialize(void)
 {
 	char param[MQTTSNGW_PARAM_MAX];
 	uint16_t unicastPortNo = 0;
@@ -209,7 +209,12 @@ int SensorNetwork::initialize(void)
 		_description += param;
 	}
 
-	return UDPPort6::open(ip.c_str(), unicastPortNo, broadcast.c_str(), interface.c_str(), hops);
+	errno = 0;
+
+	if ( UDPPort6::open(ip.c_str(), unicastPortNo, broadcast.c_str(), interface.c_str(), hops) < 0 )
+	{
+		throw EXCEPTION("Can't open a UDP6", errno);
+	}
 }
 
 const char* SensorNetwork::getDescription(void)
diff --git a/MQTTSNGateway/src/linux/udp6/SensorNetwork.h b/MQTTSNGateway/src/linux/udp6/SensorNetwork.h
index 0e3ab7e..59be5fa 100644
--- a/MQTTSNGateway/src/linux/udp6/SensorNetwork.h
+++ b/MQTTSNGateway/src/linux/udp6/SensorNetwork.h
@@ -99,7 +99,7 @@ public:
 	int unicast(const uint8_t* payload, uint16_t payloadLength, SensorNetAddress* sendto);
 	int broadcast(const uint8_t* payload, uint16_t payloadLength);
 	int read(uint8_t* buf, uint16_t bufLen);
-	int initialize(void);
+	void initialize(void);
 	const char* getDescription(void);
 	SensorNetAddress* getSenderAddress(void);
 
diff --git a/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp b/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
index 502a17d..06bd7f7 100644
--- a/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
+++ b/MQTTSNGateway/src/linux/xbee/SensorNetwork.cpp
@@ -118,7 +118,7 @@ int SensorNetwork::read(uint8_t* buf, uint16_t bufLen)
 	return XBee::recv(buf, bufLen, &_clientAddr);
 }
 
-int SensorNetwork::initialize(void)
+void SensorNetwork::initialize(void)
 {
 	char param[MQTTSNGW_PARAM_MAX];
 	uint32_t baudrate = 9600;
@@ -145,7 +145,12 @@ int SensorNetwork::initialize(void)
 	_description += ", SerialDevice ";
 	_description += param;
 
-	return XBee::open(param, baudrate);
+	errno =0;
+
+	if ( XBee::open(param, baudrate) < 0 )
+	{
+		throw EXCEPTION("Can't open a XBee", errno);
+	}
 }
 
 const char* SensorNetwork::getDescription(void)
diff --git a/MQTTSNGateway/src/linux/xbee/SensorNetwork.h b/MQTTSNGateway/src/linux/xbee/SensorNetwork.h
index 24b8752..52ad29e 100644
--- a/MQTTSNGateway/src/linux/xbee/SensorNetwork.h
+++ b/MQTTSNGateway/src/linux/xbee/SensorNetwork.h
@@ -126,7 +126,7 @@ public:
 	int unicast(const uint8_t* payload, uint16_t payloadLength, SensorNetAddress* sendto);
 	int broadcast(const uint8_t* payload, uint16_t payloadLength);
 	int read(uint8_t* buf, uint16_t bufLen);
-	int initialize(void);
+	void initialize(void);
 	const char* getDescription(void);
 	SensorNetAddress* getSenderAddress(void);