diff --git a/src_main/system/pisingleapplication.cpp b/src_main/system/pisingleapplication.cpp
index 386edbdb..ccd25a03 100644
--- a/src_main/system/pisingleapplication.cpp
+++ b/src_main/system/pisingleapplication.cpp
@@ -55,7 +55,7 @@ void PISingleApplication::sendMessage(const PIByteArray & m) {
 		if (lm[1] == 0) break;
 		piMSleep(10);
 	}
-	ba << sacnt << int(1) << m;
+	ba << sacnt << sacnt << int(1) << m;
 	shm->write(ba);
 }
 
@@ -82,20 +82,21 @@ void PISingleApplication::begin() {
 void PISingleApplication::run() {
 	if (!first) return;
 	++sacnt;
-	shm->write(&sacnt, 4);
+	int st_[2] = {sacnt, sacnt};
+	shm->write(st_, 8);
 	piCoutObj << "write" << sacnt;
 	readed = shm->readAll();
-	int t(0), nm(0);
-	readed >> t >> nm;
-	if (nm != 0) {
+	int t1(0), t2(0), nm(0);
+	readed >> t1 >> t2 >> nm;
+	if (nm != 0 && t1 == t2) {
 		PIByteArray msg;
 		readed >> msg;
 		if (!msg.isEmpty()) {
 			messageReceived(msg);
 			piCoutObj << "message" << msg;
 		}
-		int wi[2] = {sacnt, sacnt};
-		shm->write(wi, 8);
+		int wi[3] = {sacnt, sacnt, 0};
+		shm->write(wi, 12);
 	}
 }