Add MQTT project that builds on the task pool project - currently the library is building but not being used.

FreeRTOS-Plus/Demo/FreeRTOS_IoT_Libraries/mqtt/demo_logging.h

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+/*
+ * FreeRTOS Kernel V10.2.1
+ * Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+#ifndef DEMO_LOGGING_H
+#define DEMO_LOGGING_H
+
+/*
+ * Initialise a logging system that can be used from FreeRTOS tasks and Win32
+ * threads.  Do not call printf() directly while the scheduler is running.
+ *
+ * Set xLogToStdout, xLogToFile and xLogToUDP to either pdTRUE or pdFALSE to
+ * lot to stdout, a disk file and a UDP port respectively.
+ *
+ * If xLogToUDP is pdTRUE then ulRemoteIPAddress and usRemotePort must be set
+ * to the IP address and port number to which UDP log messages will be sent.
+ */
+void vLoggingInit(	BaseType_t xLogToStdout,
+					BaseType_t xLogToFile,
+					BaseType_t xLogToUDP,
+					uint32_t ulRemoteIPAddress,
+					uint16_t usRemotePort );
+
+#endif /* DEMO_LOGGING_H */
+