start mqtt client (based on paho.mqtt.c), basically works

3rd/paho.mqtt.c/src/OsWrapper.h

@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2016, 2017 logi.cals GmbH
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution.
+ *
+ * The Eclipse Public License is available at
+ *    https://www.eclipse.org/legal/epl-2.0/
+ * and the Eclipse Distribution License is available at
+ *   http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * Contributors:
+ *    Gunter Raidl - timer support for VxWorks
+ *    Rainer Poisel - reusability
+ *******************************************************************************/
+
+#if !defined(OSWRAPPER_H)
+#define OSWRAPPER_H
+
+#if defined(_WRS_KERNEL)
+#include <time.h>
+
+#define lstat stat
+
+typedef unsigned long useconds_t;
+void usleep(useconds_t useconds);
+
+#define timersub(a, b, result) \
+	do \
+	{ \
+		(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
+		(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
+		if ((result)->tv_usec < 0) \
+		{ \
+			--(result)->tv_sec; \
+			(result)->tv_usec += 1000000L; \
+		} \
+	} while (0)
+#endif /* defined(_WRS_KERNEL) */
+
+#endif /* OSWRAPPER_H */