use espMqttClient, qos2 fixed

lib/espMqttClient/src/Transport/ClientPosix.h

@@ -0,0 +1,51 @@
+/*
+Copyright (c) 2022 Bert Melis. All rights reserved.
+
+This work is licensed under the terms of the MIT license.  
+For a copy, see <https://opensource.org/licenses/MIT> or
+the LICENSE file.
+*/
+
+#pragma once
+
+#if defined(__linux__)
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <netdb.h>
+
+#include "Transport.h"  // includes IPAddress
+#include "../Logging.h"
+
+#ifndef EMC_POSIX_PEEK_SIZE
+#define EMC_POSIX_PEEK_SIZE 1500
+#endif
+
+namespace espMqttClientInternals {
+
+class ClientPosix : public Transport {
+ public:
+  ClientPosix();
+  ~ClientPosix();
+  bool connect(IPAddress ip, uint16_t port) override;
+  bool connect(const char* host, uint16_t port) override;
+  size_t write(const uint8_t* buf, size_t size) override;
+  int read(uint8_t* buf, size_t size) override;
+  void stop() override;
+  bool connected() override;
+  bool disconnected() override;
+
+ protected:
+  int _sockfd;
+  struct sockaddr_in _host;
+};
+
+}  // namespace espMqttClientInternals
+
+#endif