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_client_base.h

@@ -0,0 +1,75 @@
+/*! \file piclientserver_client_base.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_client_base_H
+#define piclientserver_client_base_H
+
+#include "pinetworkaddress.h"
+#include "pip_client_server_export.h"
+#include "pistreampacker.h"
+
+class PIEthernet;
+
+namespace PIClientServer {
+
+class Server;
+
+class PIP_CLIENT_SERVER_EXPORT ClientBase {
+	friend class Server;
+	NO_COPY_CLASS(ClientBase);
+
+public:
+	ClientBase();
+	virtual ~ClientBase();
+
+	const PIEthernet * getTCP() const { return tcp; }
+
+	void stop();
+
+	int write(const void * d, const size_t s);
+	int write(const PIByteArray & ba) { return write(ba.data(), ba.size()); }
+
+	void enableSymmetricEncryption(const PIByteArray & key);
+
+protected:
+	virtual void readed(PIByteArray data) {}
+	virtual void connected() {}
+	virtual void disconnected() {}
+
+	void init();
+
+	bool own_tcp               = false;
+	std::atomic_bool can_write = {true};
+	PIEthernet * tcp           = nullptr;
+
+private:
+	void destroy();
+
+	PIStreamPacker stream;
+	mutable PIMutex write_mutex;
+};
+
+} // namespace PIClientServer
+
+#endif