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

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

@@ -0,0 +1,55 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2022 IBM Corp., Ian Craggs
+ *
+ * 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, Allan Stockdill-Mander - initial implementation
+ *    Ian Craggs - SNI support
+ *    Ian Craggs - post connect checks and CApath
+ *******************************************************************************/
+#if !defined(SSLSOCKET_H)
+#define SSLSOCKET_H
+
+#if defined(_WIN32)
+	#define ssl_mutex_type HANDLE
+#else
+	#include <pthread.h>
+	#include <semaphore.h>
+	#define ssl_mutex_type pthread_mutex_t
+#endif
+
+#include <openssl/ssl.h>
+#include "SocketBuffer.h"
+#include "Clients.h"
+
+#define URI_SSL   "ssl://"
+#define URI_TLS   "tls://"
+#define URI_MQTTS "mqtts://"
+
+/** if we should handle openssl initialization (bool_value == 1) or depend on it to be initalized externally (bool_value == 0) */
+void SSLSocket_handleOpensslInit(int bool_value);
+
+int SSLSocket_initialize(void);
+void SSLSocket_terminate(void);
+int SSLSocket_setSocketForSSL(networkHandles* net, MQTTClient_SSLOptions* opts, const char* hostname, size_t hostname_len);
+
+int SSLSocket_getch(SSL* ssl, SOCKET socket, char* c);
+char *SSLSocket_getdata(SSL* ssl, SOCKET socket, size_t bytes, size_t* actual_len, int* rc);
+
+int SSLSocket_close(networkHandles* net);
+int SSLSocket_putdatas(SSL* ssl, SOCKET socket, char* buf0, size_t buf0len, PacketBuffers bufs);
+int SSLSocket_connect(SSL* ssl, SOCKET sock, const char* hostname, int verify, int (*cb)(const char *str, size_t len, void *u), void* u);
+
+SOCKET SSLSocket_getPendingRead(void);
+int SSLSocket_continueWrite(pending_writes* pw);
+int SSLSocket_abortWrite(pending_writes* pw);
+
+#endif