use espMqttClient, qos2 fixed

lib/espMqttClient/src/Transport/Transport.h

@@ -0,0 +1,28 @@
+/*
+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
+
+#include <stddef.h>  // size_t
+
+#include "IPAddress.h"
+
+namespace espMqttClientInternals {
+
+class Transport {
+ public:
+  virtual bool connect(IPAddress ip, uint16_t port) = 0;
+  virtual bool connect(const char* host, uint16_t port) = 0;
+  virtual size_t write(const uint8_t* buf, size_t size) = 0;
+  virtual int read(uint8_t* buf, size_t size) = 0;
+  virtual void stop() = 0;
+  virtual bool connected() = 0;
+  virtual bool disconnected() = 0;
+};
+
+}  // namespace espMqttClientInternals