PIEthernet fix tcp-server close (properly delete all clients)

PIEthernet::stopThreadedListen() method
decompose client to 2 implementations - server-side and client-side

libs/main/client_server/piclientserver_server.h

@@ -0,0 +1,73 @@
+/*! \file piclientserver_server.h
+ * \ingroup ClientServer
+ * \~\brief
+ * \~english
+ * \~russian
+ */
+/*
+    PIP - Platform Independent Primitives
+	Ivan Pelipenko peri4ko@yandex.ru
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef piclientserver_server_H
+#define piclientserver_server_H
+
+#include "pimutex.h"
+#include "pinetworkaddress.h"
+#include "pip_client_server_export.h"
+
+class PIEthernet;
+class PIThread;
+
+namespace PIClientServer {
+
+class ServerClient;
+
+class PIP_CLIENT_SERVER_EXPORT Server {
+public:
+	Server();
+	virtual ~Server();
+
+	void listen(PINetworkAddress addr);
+	void listenAll(ushort port) { listen({0, port}); }
+
+	int getMaxClients() const { return max_clients; }
+	void setMaxClients(int new_max_clients);
+	int clientsCount() const;
+	void forEachClient(std::function<void(ServerClient *)> func);
+
+	void setClientFactory(std::function<ServerClient *()> f) { client_factory = f; }
+
+	void enableSymmetricEncryption(const PIByteArray & key);
+
+private:
+	void stopServer();
+	void newClient(ServerClient * c);
+
+	std::function<ServerClient *()> client_factory;
+	std::atomic_bool is_closing = {false};
+	PIEthernet * tcp_server     = nullptr;
+	PIThread * clean_thread     = nullptr;
+	PIByteArray crypt_key;
+	PIVector<ServerClient *> clients;
+	mutable PIMutex clients_mutex;
+
+	int max_clients = 1000;
+};
+
+} // namespace PIClientServer
+
+#endif