diff --git a/src/ckernelwifi.cc b/src/ckernelwifi.cc
index 02dc469..cf83af3 100644
--- a/src/ckernelwifi.cc
+++ b/src/ckernelwifi.cc
@@ -179,8 +179,10 @@ int CKernelWifi::process_messages(struct nl_msg *msg)
 	}
 
 	int value=_SendSignal(&power, (char*)nlh, msg_len);
-	if( value == SOCKET_ERROR )
+	if( value == SOCKET_ERROR ) {
+		printf("Error sending to server\n");
 		manage_server_crash();
+	}
 
 	// Send also on the others interfaces on the same VM :
 	// ------------------->
@@ -449,8 +451,10 @@ void CKernelWifi::recv_from_server(){
 		return ;
 
 	TPower power;
-	if( _RecvSignal(&power, &dropped, &Buffer) == SOCKET_ERROR )
+	if( _RecvSignal(&power, &dropped, &Buffer) == SOCKET_ERROR ) {
+		printf("Error receiving from server\n");
 		manage_server_crash();
+	}
 
 	int signal = power ;
 
@@ -539,6 +543,7 @@ void CKernelWifi::recv_from_server(){
 	if (!dropped)
 		flags |= HWSIM_TX_STAT_ACK;
 
+#if 0
 	struct nl_msg *tx_info = build_tx_info(&framesrc, flags,
 						(int)signal,
 						tx_rates,
@@ -549,8 +554,11 @@ void CKernelWifi::recv_from_server(){
 	int value=_SendSignal(&power, (char*)hdr, hdr->nlmsg_len);
 
 	nlmsg_free(tx_info);
-	if( value == SOCKET_ERROR )
+	if( value == SOCKET_ERROR ) {
+		printf("Error sending tx info to server\n");
 		manage_server_crash();
+	}
+#endif
 
 	if (dropped)
 		return;
@@ -926,6 +934,7 @@ bool CKernelWifi::is_connected_to_server(){
 
 void CKernelWifi::manage_server_crash(){
 
+	printf("MANAGE SERVER CRASH");
 	connected_to_server(false) ;
 
 }
diff --git a/src/csocket.cc b/src/csocket.cc
index 423662c..b40fc58 100644
--- a/src/csocket.cc
+++ b/src/csocket.cc
@@ -53,8 +53,10 @@ ssize_t CSocket::SendBigData(TDescriptor descriptor, const char* data, TMinimalS
 ssize_t CSocket::Read(TDescriptor descriptor, char* data, ssize_t sizeOfData)
 {
 	ssize_t ret = recv(descriptor , data, sizeOfData, 0);
-	if ( ret <= 0 )
+	if ( ret <= 0 ) {
+		printf("Recv failed with %ld\n", errno);
 		return SOCKET_ERROR ;
+	}
 
 	return ret;
 }
diff --git a/src/cwifi.cc b/src/cwifi.cc
index 02775b7..bb2d780 100644
--- a/src/cwifi.cc
+++ b/src/cwifi.cc
@@ -15,7 +15,7 @@
 const double ConstanteC=92.45;
 const TFrequency DEFAULT_FREQUENCY=2412; // Hz
 
-const int MTU=1640; // Maximum Transmission Unit : 1640 is an experimental value
+const int MTU=4096; // Maximum Transmission Unit : 1640 is an experimental value
 
 TFrequency CWifi::GetFrequency(struct nlmsghdr* nlh)
 {
@@ -83,24 +83,32 @@ ssize_t CWifi::RecvSignalWithSocket(CSocket* socket, TDescriptor descriptor, TPo
 
 	// read the power
 	valread = socket->Read(descriptor, (char*)power, sizeof(TPower));
-	if ( valread <= 0 )
+	if ( valread <= 0 ) {
+		printf("cannot read power %d\n", valread);
 		return valread;
+	}
 
 	// read dropped
 	valread = socket->Read(descriptor, (char*)dropped, sizeof(uint8_t));
-	if ( valread <= 0 )
+	if ( valread <= 0 ) {
+		printf("cannot read dropped %d\n", valread);
 		return valread;
+	}
 
 	// read the signal
 	// "nlmsg_len" (type "uint32_t") is the first attribut of the "struct nlmsghdr" in "libnl3/netlink/netlink-kernel.h"
 	ssize_t sizeRead = socket->ReadEqualSize(descriptor, buffer, 0, sizeof(struct nlmsghdr));
-	if( sizeRead == SOCKET_ERROR  )
+	if( sizeRead == SOCKET_ERROR  ) {
+		printf("Cannot read nlmsg_len\n");
 		return SOCKET_ERROR;
+	}
 
 	int sizeTotal=((struct nlmsghdr *)(buffer->GetBuffer()))->nlmsg_len;
 
-	if( sizeTotal > MTU ) // to avoid that a error packet overfulls the memory
+	if( sizeTotal > MTU ) { // to avoid that a error packet overfulls the memory
+		printf("Size greater than MTU %d\n", sizeTotal);
 		return SOCKET_ERROR;
+	}
 
 	return socket->ReadEqualSize(descriptor, buffer, sizeRead, sizeTotal);
 }