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

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

@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2018 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 API and implementation and/or initial documentation
+ *    Ian Craggs, Allan Stockdill-Mander - SSL updates
+ *    Ian Craggs - MQTT 3.1.1 support
+ *    Ian Craggs - MQTT 5.0 support
+ *******************************************************************************/
+
+#if !defined(MQTTPACKETOUT_H)
+#define MQTTPACKETOUT_H
+
+#include "MQTTPacket.h"
+
+int MQTTPacket_send_connect(Clients* client, int MQTTVersion,
+		MQTTProperties* connectProperties, MQTTProperties* willProperties);
+void* MQTTPacket_connack(int MQTTVersion, unsigned char aHeader, char* data, size_t datalen);
+void MQTTPacket_freeConnack(Connack* pack);
+
+int MQTTPacket_send_pingreq(networkHandles* net, const char* clientID);
+
+int MQTTPacket_send_subscribe(List* topics, List* qoss, MQTTSubscribe_options* opts, MQTTProperties* props,
+		int msgid, int dup, Clients* client);
+void* MQTTPacket_suback(int MQTTVersion, unsigned char aHeader, char* data, size_t datalen);
+
+int MQTTPacket_send_unsubscribe(List* topics, MQTTProperties* props, int msgid, int dup, Clients* client);
+void* MQTTPacket_unsuback(int MQTTVersion, unsigned char aHeader, char* data, size_t datalen);
+
+#endif