diff --git a/.gitignore b/.gitignore
index 9a909f74..f1280e1a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@
 /doc/rtf
 _unsused
 CMakeLists.txt.user*
-/include
\ No newline at end of file
+/include
+/release
diff --git a/libs/client_server/piclientserver_client.cpp b/libs/client_server/piclientserver_client.cpp
index 7c81d86b..2319584a 100644
--- a/libs/client_server/piclientserver_client.cpp
+++ b/libs/client_server/piclientserver_client.cpp
@@ -50,5 +50,4 @@ void PIClientServer::Client::connect(PINetworkAddress addr) {
 	config.apply(this);
 	tcp->connect(addr, true);
 	tcp->startThreadedRead();
-	piCout << "Connect to" << addr.toString();
 }
diff --git a/libs/client_server/piclientserver_server.cpp b/libs/client_server/piclientserver_server.cpp
index 164f5dfa..7984d36f 100644
--- a/libs/client_server/piclientserver_server.cpp
+++ b/libs/client_server/piclientserver_server.cpp
@@ -123,7 +123,6 @@ void PIClientServer::Server::newClient(ServerClient * c) {
 	config.apply(c);
 	c->tcp->startThreadedRead();
 	c->connected();
-	piCout << "New client";
 }
 
 
diff --git a/libs/main/application/pisystemmonitor.cpp b/libs/main/application/pisystemmonitor.cpp
index 4454273e..522df17b 100644
--- a/libs/main/application/pisystemmonitor.cpp
+++ b/libs/main/application/pisystemmonitor.cpp
@@ -19,6 +19,8 @@
 
 #include "pisystemmonitor.h"
 
+#include <unistd.h>
+
 #include "pidir.h"
 #include "piliterals_string.h"
 #include "piprocess.h"
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index b8369eed..3eefbfcb 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -34,3 +34,4 @@ endmacro()
 pip_test(math)
 pip_test(core)
 pip_test(piobject)
+pip_test(client_server pip_client_server)
diff --git a/tests/client_server/client_server_test.cpp b/tests/client_server/client_server_test.cpp
new file mode 100644
index 00000000..59839512
--- /dev/null
+++ b/tests/client_server/client_server_test.cpp
@@ -0,0 +1,210 @@
+#include "pitime.h"
+#include "test_client_helper.h"
+
+#include "gtest/gtest.h"
+
+template<bool WithConnectPing = false, bool WithPong = false, ullong WriteSize = 64_KiB>
+PIClientServer::Server * createServer() {
+	auto s = new PIClientServer::Server();
+	s->setClientFactory([] { return new TestServerClient<WithConnectPing, WithPong, WriteSize>(); });
+	s->listenAll(12345);
+	return s;
+}
+
+bool waitLoop(std::function<bool()> exit_loop, const PISystemTime & timeout) {
+	PITimeMeasurer tm;
+	while (!exit_loop() && (tm.elapsed() < timeout)) {
+		piMinSleep();
+	}
+	return tm.elapsed() < timeout;
+}
+
+template<typename Client>
+Client * createAndConnectClient() {
+	auto c = new Client();
+	c->connect(PINetworkAddress::resolve("127.0.0.1", 12345));
+	return c;
+}
+
+TEST(ClientServer, OneClient) {
+	auto const loop_timeout = 1000_ms;
+	auto s                  = createServer<false, true>();
+	auto c                  = createAndConnectClient<TestClient<false, false>>();
+
+	waitLoop([s]() { return s->clientsCount() > 0; }, loop_timeout);
+	EXPECT_EQ(1, s->clientsCount());
+
+	c->ping();
+	waitLoop([c]() { return c->pongCnt() > 0; }, loop_timeout);
+	EXPECT_EQ(1, c->pongCnt());
+
+	s->forEachClient([](PIClientServer::ServerClient * sc) { static_cast<TestServerClient<> *>(sc)->ping(); });
+	waitLoop([c]() { return c->pongCnt() > 1; }, loop_timeout);
+	EXPECT_EQ(2, c->pongCnt());
+
+	EXPECT_TRUE(c->getTCP()->isConnected());
+
+	delete c;
+	waitLoop([s]() { return s->clientsCount() == 0; }, loop_timeout);
+	EXPECT_EQ(0, s->clientsCount());
+	delete s;
+}
+
+
+class ClientSendThread {
+	using ClientType = TestClient<false, false, 100_KiB>;
+
+public:
+	ClientSendThread() { client = createAndConnectClient<ClientType>(); }
+
+	~ClientSendThread() {
+		sendThread.stopAndWait();
+		delete client;
+	}
+
+	void startSend() {
+		auto c = client;
+		sendThread.start([c] { c->ping(); }, 100._Hz);
+	}
+    
+    void sendOnce() {client->ping();}
+
+	ClientType * client = nullptr;
+	PIThread sendThread;
+};
+
+
+int getServerPongs(PIClientServer::Server * s) {
+    int pongs = 0;
+    s->forEachClient([&pongs](PIClientServer::ServerClient * sc){
+        const auto c = static_cast<TestServerClient<> *>(sc);
+        pongs += c->pongCnt();
+    });
+    return pongs;
+}
+
+int getClientsPongs(const PIVector<ClientSendThread *> & clients) {
+    int pongs = 0;
+    clients.forEach([&pongs](ClientSendThread * c){
+        pongs += c->client->pongCnt();
+    });
+    return pongs;
+}
+
+int getClientsPings(const PIVector<ClientSendThread *> & clients) {
+    int pings = 0;
+    clients.forEach([&pings](ClientSendThread * c){
+        pings += c->client->pingCnt();
+    });
+    return pings;
+}
+
+
+TEST(ClientServer, ManyClients) {
+	auto const loop_timeout     = 1000_ms;
+	constexpr int clients_count = 20;
+	PIVector<ClientSendThread *> clients;
+	auto s = createServer<false, false, 100_KiB>();
+
+	piForTimes(clients_count) {
+		clients.append(new ClientSendThread());
+	}
+	EXPECT_EQ(clients_count, clients.size_s());
+
+	waitLoop([s]() { return s->clientsCount() == clients_count; }, loop_timeout);
+	EXPECT_EQ(clients_count, s->clientsCount());
+    
+    EXPECT_EQ(0, getServerPongs(s));
+    
+    EXPECT_EQ(getClientsPings(clients), 0);
+    
+    for (const auto c : clients) {
+        c->sendOnce();
+    }
+    
+    EXPECT_EQ(getClientsPings(clients), clients_count);
+    EXPECT_TRUE(clients.every([](ClientSendThread * c){return c->client->pingCnt() == 1;}));
+    EXPECT_TRUE(clients.every([](ClientSendThread * c){return c->client->pongCnt() == 0;}));
+    waitLoop([s]() { return getServerPongs(s) >= clients_count; }, loop_timeout);
+    EXPECT_EQ(clients_count, getServerPongs(s));
+    
+    s->forEachClient([](PIClientServer::ServerClient * sc) { static_cast<TestServerClient<> *>(sc)->ping(); });
+    const auto clientCheckPong = [&clients](){return clients.every([](ClientSendThread * c){return c->client->pongCnt() == 1;});};
+    waitLoop([&clientCheckPong]() { return clientCheckPong(); }, loop_timeout);
+    EXPECT_TRUE(clientCheckPong());
+    
+    for (const auto c : clients) {
+        c->startSend();
+    }
+    (100_ms).sleep();
+    EXPECT_TRUE(getClientsPings(clients) > clients_count*2);
+    EXPECT_TRUE(getServerPongs(s) > clients_count*2);
+    piDeleteAllAndClear(clients);
+    waitLoop([s]() { return s->clientsCount() == 0; }, loop_timeout);
+    EXPECT_EQ(0, s->clientsCount());
+    delete s;
+}
+
+TEST(ClientServer, DynamicClients) {
+    auto const loop_timeout     = 1000_ms;
+	constexpr int clients_count = 20;
+    PIVector<ClientSendThread *> clients;
+    PIMutex clients_mutex;
+	auto s = createServer<true, true, 100_KiB>();
+    
+    const auto spawnClient = [&clients, &clients_mutex]() {
+        auto c = new ClientSendThread();
+        c->startSend();
+        clients_mutex.lock();
+        clients << c;
+        clients_mutex.unlock();
+        piCout << "new client" << clients.size();
+     };
+    
+    piForTimes(clients_count) {
+		spawnClient();
+	}
+    
+    PIThread spawnThread;
+    PIThread deleteThread;
+    
+    spawnThread.start([&spawnClient](){
+        const int new_cnt = randomi() % 10;
+        piForTimes(new_cnt) {
+            spawnClient();
+        }
+    }, 12_Hz);
+    
+    deleteThread.start([&clients, &clients_mutex](){
+        const int rm_cnt = randomi() % 10;
+        piForTimes(rm_cnt) {
+            ClientSendThread * c = nullptr;
+            clients_mutex.lock();
+            if (clients.size() > 10) {
+                c = clients.take_back();
+            }
+            clients_mutex.unlock();
+            if (c) {
+                delete c;
+                piCout << "remove client" << clients.size();
+            }
+        }
+    }, 13_Hz);
+    
+    (1_s).sleep();
+    
+    EXPECT_GE(s->clientsCount(), 10);
+    
+    piCout << "now clients" << clients.size();
+    
+    //delete s;
+    
+    deleteThread.stopAndWait();
+    spawnThread.stopAndWait();
+    
+    piCout << "total clients" << clients.size();
+    
+    piDeleteAllAndClear(clients);
+    waitLoop([s]() { return s->clientsCount() == 0; }, loop_timeout);
+    EXPECT_EQ(0, s->clientsCount());
+}
diff --git a/tests/client_server/test_client_helper.h b/tests/client_server/test_client_helper.h
new file mode 100644
index 00000000..2c261738
--- /dev/null
+++ b/tests/client_server/test_client_helper.h
@@ -0,0 +1,77 @@
+#ifndef TEST_CLIENT_HELPER_H
+#define TEST_CLIENT_HELPER_H
+
+#include "piclientserver_client.h"
+#include "piclientserver_server.h"
+#include "piethernet.h"
+#include "piliterals.h"
+#include "pithread.h"
+
+
+template<ullong WriteSize = 64_KiB, bool WithPong = false>
+class TestClientBase {
+public:
+	int pongCnt() const { return pong_cnt; }
+
+	int pingCnt() const { return ping_cnt; }
+
+	void ping() {
+        const auto data = PIByteArray(WriteSize);
+		writeInternal(data);
+		ping_cnt++;
+	}
+
+protected:
+	virtual void writeInternal(const PIByteArray & ba) = 0;
+
+	void readInternal(const PIByteArray & ba) {
+		last_read_size = ba.size();
+		pong_cnt++;
+		if (WithPong) ping();
+	}
+
+private:
+	int pong_cnt          = 0;
+	int ping_cnt          = 0;
+	ullong last_read_size = 0;
+};
+
+
+template<bool WithConnectPing = false, bool WithPong = false, ullong WriteSize = 64_KiB>
+class TestServerClient
+	: public PIClientServer::ServerClient
+	, public TestClientBase<WriteSize, WithPong> {
+	using Base = TestClientBase<WriteSize, WithPong>;
+
+private:
+	void readed(PIByteArray data) override { Base::readInternal(data); }
+
+	void connected() override {
+		if (WithConnectPing) {
+			Base::ping();
+		}
+	}
+
+	void writeInternal(const PIByteArray & ba) override { write(ba); }
+};
+
+
+template<bool WithConnectPing = false, bool WithPong = false, ullong WriteSize = 64_KiB>
+class TestClient
+	: public PIClientServer::Client
+	, public TestClientBase<WriteSize, WithPong> {
+	using Base = TestClientBase<WriteSize, WithPong>;
+
+private:
+	void readed(PIByteArray data) override { Base::readInternal(data); }
+
+	void connected() override {
+		if (WithConnectPing) {
+			Base::ping();
+		}
+	}
+
+	void writeInternal(const PIByteArray & ba) override { write(ba); }
+};
+
+#endif // TEST_CLIENT_HELPER_H
diff --git a/tests/piobject/connect.cpp b/tests/piobject/connect.cpp
index 1147597a..a5602cd8 100644
--- a/tests/piobject/connect.cpp
+++ b/tests/piobject/connect.cpp
@@ -31,23 +31,23 @@ private:
 TEST(PiobjectConnections, CONNECT0) {
 	Object a;
 	Object b;
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	CONNECT0(void, &a, event_test, &b, handler_test);
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	//	piCout << "================";
 }
 
@@ -57,105 +57,105 @@ TEST(PiobjectConnections, CONNECT0_DISCONNECT) {
 	Object b;
 	a.setName("A");
 	b.setName("B");
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	CONNECT0(void, &a, event_test, &b, handler_test);
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	PIObject::piDisconnect(&a, "event_test");
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	//	piCout << "================";
 }
 
 TEST(PiobjectConnections, CONNECTU) {
 	Object a;
 	Object b;
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	CONNECTU(&a, event_test, &b, handler_test);
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	//	piCout << "================";
 }
 
 TEST(PiobjectConnections, CONNECTU_DISCONNECT) {
 	Object a;
 	Object b;
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	CONNECTU(&a, event_test, &b, handler_test);
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 0);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 0);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	PIObject::piDisconnect(&a, "event_test");
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	a.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	b.test();
-	ASSERT_EQ(a.getX(), 0);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 0);
+	EXPECT_EQ(b.getX(), 1);
 	a.handler_val(99);
-	ASSERT_EQ(a.getX(), 99);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 99);
+	EXPECT_EQ(b.getX(), 1);
 	CONNECTU(&a, event_val, &b, handler_val);
-	ASSERT_EQ(a.getX(), 99);
-	ASSERT_EQ(b.getX(), 1);
+	EXPECT_EQ(a.getX(), 99);
+	EXPECT_EQ(b.getX(), 1);
 	a.test_val();
-	ASSERT_EQ(a.getX(), 99);
-	ASSERT_EQ(b.getX(), 99);
+	EXPECT_EQ(a.getX(), 99);
+	EXPECT_EQ(b.getX(), 99);
 	a.handler_val(-1);
-	ASSERT_EQ(a.getX(), -1);
-	ASSERT_EQ(b.getX(), 99);
+	EXPECT_EQ(a.getX(), -1);
+	EXPECT_EQ(b.getX(), 99);
 	PIObject::piDisconnect(&a, "event_val", &b);
-	ASSERT_EQ(a.getX(), -1);
-	ASSERT_EQ(b.getX(), 99);
+	EXPECT_EQ(a.getX(), -1);
+	EXPECT_EQ(b.getX(), 99);
 	a.test_val();
-	ASSERT_EQ(a.getX(), -1);
-	ASSERT_EQ(b.getX(), 99);
+	EXPECT_EQ(a.getX(), -1);
+	EXPECT_EQ(b.getX(), 99);
 	//	piCout << "================";
 }