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

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

@@ -0,0 +1,77 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2026 IBM Corp.
+ *
+ * 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:
+ *    Ian Craggs - initial implementation
+ *    Ian Craggs, Allan Stockdill-Mander - async client updates
+ *    Ian Craggs - fix for bug #420851
+ *    Ian Craggs - change MacOS semaphore implementation
+ *    Frank Pagliughi - Consolidated semaphores and conditions into "events"
+ *******************************************************************************/
+
+#if !defined(THREAD_H)
+#define THREAD_H
+
+#if !defined(_WIN32)
+#if defined(__GNUC__) && defined(__linux__)
+#if !defined(_GNU_SOURCE)
+// for pthread_setname
+	#define _GNU_SOURCE
+#endif
+#endif
+#endif
+
+#include "MQTTExportDeclarations.h"
+
+#include "MQTTClient.h"
+
+#if defined(_WIN32)
+	#include <windows.h>
+
+	#define mutex_type HANDLE
+	#define thread_type HANDLE
+	#define thread_id_type DWORD
+	#define thread_return_type DWORD
+	#define thread_fn LPTHREAD_START_ROUTINE
+	#define evt_type HANDLE
+	#undef ETIMEDOUT
+	#define ETIMEDOUT WSAETIMEDOUT
+#else
+	#include <pthread.h>
+
+	#define mutex_type pthread_mutex_t*
+	#define thread_type pthread_t
+	#define thread_id_type pthread_t
+	#define thread_return_type void*
+	typedef thread_return_type (*thread_fn)(void*);
+	typedef struct { pthread_cond_t cond; pthread_mutex_t mutex; int val; } evt_type_struct;
+	typedef evt_type_struct *evt_type;
+#endif
+
+/* Thread functions */
+LIBMQTT_API void Paho_thread_start(thread_fn, void*);
+int Thread_set_name(const char* thread_name);
+LIBMQTT_API thread_id_type Paho_thread_getid();
+
+/* Mutex functions */
+LIBMQTT_API mutex_type Paho_thread_create_mutex(int*);
+LIBMQTT_API int Paho_thread_lock_mutex(mutex_type);
+LIBMQTT_API int Paho_thread_unlock_mutex(mutex_type);
+int Paho_thread_destroy_mutex(mutex_type);
+
+/* Event Functions */
+evt_type Thread_create_evt(int*);
+int Thread_signal_evt(evt_type);
+int Thread_wait_evt(evt_type condvar, int timeout);
+int Thread_destroy_evt(evt_type);
+
+#endif