diff --git a/Makefile b/Makefile
index 6e9bd63..df5f962 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 PACKAGE = 'ipc'
-VERSION = '0.1.0'
+VERSION = '0.4.0'
 
 PREFIX := /usr/local
 BINDIR := $(PREFIX)/bin
@@ -62,25 +62,25 @@ libipc.so: src/communication.o src/error.o src/logger.o src/message.o src/networ
 	$(Q)$(CC) -o libipc.so -shared $(LDFLAGS) src/communication.o src/error.o src/logger.o src/message.o src/network.o src/usocket.o src/utils.o 
 
 libipc.so.install: libipc.so
-	@echo '  IN >    $(LIBDIR)/libipc.so.0.1.0'
+	@echo '  IN >    $(LIBDIR)/libipc.so.0.4.0'
 	$(Q)mkdir -p '$(DESTDIR)$(LIBDIR)'
-	$(Q)install -m0755 libipc.so $(DESTDIR)$(LIBDIR)/libipc.so.0.1.0
-	@echo '  LN >    $(LIBDIR)/libipc.so.0.1'
-	$(Q)ln -sf '$(LIBDIR)/libipc.so.0.1.0' '$(DESTDIR)/$(LIBDIR)/libipc.so.0.1'
+	$(Q)install -m0755 libipc.so $(DESTDIR)$(LIBDIR)/libipc.so.0.4.0
+	@echo '  LN >    $(LIBDIR)/libipc.so.0.4'
+	$(Q)ln -sf '$(LIBDIR)/libipc.so.0.4.0' '$(DESTDIR)/$(LIBDIR)/libipc.so.0.4'
 	@echo '  LN >    $(LIBDIR)/libipc.so.0'
-	$(Q)ln -sf '$(LIBDIR)/libipc.so.0.1.0' '$(DESTDIR)/$(LIBDIR)/libipc.so.0'
+	$(Q)ln -sf '$(LIBDIR)/libipc.so.0.4.0' '$(DESTDIR)/$(LIBDIR)/libipc.so.0'
 	@echo '  LN >    $(LIBDIR)/libipc.so'
-	$(Q)ln -sf '$(LIBDIR)/libipc.so.0.1.0' '$(DESTDIR)/$(LIBDIR)/libipc.so'
+	$(Q)ln -sf '$(LIBDIR)/libipc.so.0.4.0' '$(DESTDIR)/$(LIBDIR)/libipc.so'
 
 libipc.so.clean:
 	@echo '  RM >    libipc.so'
 	$(Q)rm -f libipc.so
 
 libipc.so.uninstall:
-	@echo '  RM >    $(LIBDIR)/libipc.so.0.1.0'
-	$(Q)rm -f '$(DESTDIR)$(LIBDIR)/libipc.so.0.1.0'
-	@echo '  RM >    $(LIBDIR)/libipc.so.0.1'
-	$(Q)rm -f '$(DESTDIR)$(LIBDIR)/libipc.so.0.1'
+	@echo '  RM >    $(LIBDIR)/libipc.so.0.4.0'
+	$(Q)rm -f '$(DESTDIR)$(LIBDIR)/libipc.so.0.4.0'
+	@echo '  RM >    $(LIBDIR)/libipc.so.0.4'
+	$(Q)rm -f '$(DESTDIR)$(LIBDIR)/libipc.so.0.4'
 	@echo '  RM >    $(LIBDIR)/libipc.so.0'
 	$(Q)rm -f '$(DESTDIR)$(LIBDIR)/libipc.so.0'
 	@echo '  RM >    $(LIBDIR)/libipc.so'
@@ -296,7 +296,7 @@ $(PACKAGE)-$(VERSION).tar.bz2: distdir
 		$(PACKAGE)-$(VERSION)/src/utils.h
 
 help:
-	@echo ' :: ipc-0.1.0'
+	@echo ' :: ipc-0.4.0'
 	@echo ''
 	@echo 'Generic targets:'
 	@echo '    - help           Prints this help message.'
diff --git a/project.zsh b/project.zsh
index ce7d365..406f707 100644
--- a/project.zsh
+++ b/project.zsh
@@ -1,6 +1,6 @@
 
 package=ipc
-version=0.3.0
+version=0.4.0
 
 CFLAGS="-Wall -Wextra -g"
 
diff --git a/src/communication.c b/src/communication.c
index 0206d61..4f89cf0 100644
--- a/src/communication.c
+++ b/src/communication.c
@@ -381,7 +381,8 @@ enum ipc_errors handle_message (struct ipc_event *event
 enum ipc_errors ipc_wait_event_networkd (struct ipc_connection_infos *cinfos
         , struct ipc_connection_info *cinfo // NULL for clients
         , struct ipc_event *event
-		, struct ipc_switchings *switchdb)
+		, struct ipc_switchings *switchdb
+		, long *timer /** TODO: timers */)
 {
     T_R ((cinfos == NULL), IPC_ERROR_WAIT_EVENT__NO_CLIENTS_PARAM);
     T_R ((event == NULL), IPC_ERROR_WAIT_EVENT__NO_EVENT_PARAM);
@@ -419,7 +420,24 @@ enum ipc_errors ipc_wait_event_networkd (struct ipc_connection_infos *cinfos
     }
 
     readf = master;
-    T_PERROR_R ((select(fdmax+1, &readf, NULL, NULL, NULL) == -1), "select", IPC_ERROR_WAIT_EVENT__SELECT);
+
+	struct timeval *ptimeout = NULL;
+	SECURE_DECLARATION (struct timeval, timeout);
+
+	if (timer != NULL && *timer > 0) {
+		timeout.tv_sec = *timer;
+		ptimeout = &timeout;
+	}
+
+    T_PERROR_R ((select(fdmax+1, &readf, NULL, NULL, ptimeout) == -1), "select", IPC_ERROR_WAIT_EVENT__SELECT);
+
+	if (ptimeout != NULL) {
+		*timer = timeout.tv_sec;
+		if (*timer == 0) {
+			IPC_EVENT_SET(event, IPC_EVENT_TYPE_TIMER, NULL, NULL);
+			return IPC_ERROR_NONE;
+		}
+	}
 
     for (i = 0; i <= (size_t) fdmax; i++) {
         if (FD_ISSET(i, &readf)) {
@@ -440,9 +458,10 @@ enum ipc_errors ipc_wait_event_networkd (struct ipc_connection_infos *cinfos
 
 enum ipc_errors ipc_wait_event (struct ipc_connection_infos *cinfos
         , struct ipc_connection_info *cinfo // NULL for clients
-        , struct ipc_event *event)
+        , struct ipc_event *event
+        , long *timer)
 {
-	return ipc_wait_event_networkd (cinfos, cinfo, event, NULL);
+	return ipc_wait_event_networkd (cinfos, cinfo, event, NULL, timer);
 }
 
 // store and remove only pointers on allocated structures
diff --git a/src/ipc.h b/src/ipc.h
index 3f069f2..d1515da 100644
--- a/src/ipc.h
+++ b/src/ipc.h
@@ -18,7 +18,7 @@
 #define IPC_HEADER_SIZE  6
 #define IPC_MAX_MESSAGE_SIZE  8000000-IPC_HEADER_SIZE
 
-#define IPC_VERSION 3
+#define IPC_VERSION 4
 
 #if ! defined(IPC_WITHOUT_ERRORS) && ! defined(IPC_WITH_ERRORS)
 #define IPC_WITH_ERRORS                               2
@@ -123,6 +123,7 @@ enum ipc_event_type {
 	, IPC_EVENT_TYPE_DISCONNECTION  = 5
 	, IPC_EVENT_TYPE_MESSAGE        = 6
 	, IPC_EVENT_TYPE_LOOKUP         = 7
+	, IPC_EVENT_TYPE_TIMER          = 8
 };
 
 enum ipc_errors {
@@ -310,7 +311,8 @@ enum ipc_errors ipc_write (const struct ipc_connection_info *, const struct ipc_
 
 enum ipc_errors ipc_wait_event (struct ipc_connection_infos *clients
 		, struct ipc_connection_info *srv
-        , struct ipc_event *event);
+        , struct ipc_event *event
+        , long *timer);
 
 // store and remove only pointers on allocated structures
 enum ipc_errors ipc_add (struct ipc_connection_infos *, struct ipc_connection_info *);
@@ -390,7 +392,8 @@ struct networkd {
 enum ipc_errors ipc_wait_event_networkd (struct ipc_connection_infos *cinfos
         , struct ipc_connection_info *cinfo // NULL for clients
         , struct ipc_event *event
-		, struct ipc_switchings *switchdb);
+		, struct ipc_switchings *switchdb
+		, long *timer);
 
 
 void ipc_switching_add (struct ipc_switchings *is, int orig, int dest);