gfaservices/svc/mqttcl/main.cpp

////////////////////////////////////////////////////////////////////////////////////////////////////
//

#include <stdio.h>
#include <signal.h>
#include <linux/limits.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/if_arp.h>
#include <netinet/in.h>
#include <ifaddrs.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <gfa/svc/common/strutil.h>
#include <gfa/svc/common/fileutil.h>
#include <gfa/svc/common/instance.h>
#include <gfa/svc/common/processclock.h>
#include <gfa/svc/common/debug.h>
#include <gfa/svc/mqttcl/mqttclient.h>
#include <gfa/svc/mqttcl/mqttcfg.h>
#include <gfa/svc/mqttcl/mqttdbg.h>
#include "projal.h"

////////////////////////////////////////////////////////////////////////////////////////////////////

#if _ENABLE_MEM_TRACE
#include <mcheck.h>
class CMtrace
{
public:
	CMtrace(void) {
	    putenv("MALLOC_TRACE=/home/wrk/share/config/services/Debug/Desktop_Qt_5_7_0_GCC_64bit/mqttcl/mtrace.log");
		mtrace();
	}
	~CMtrace(void){
//		muntrace();
	}
};
#endif	//	_ENABLE_MEM_TRACE



#if _TRACK_TIMES
static CProcessClock g_pc;
unsigned long g_nDbgCounter1 = 0;
unsigned long g_nDbgCounter2 = 0;
unsigned long g_nDbgCounter3 = 0;
#endif	//	_TRACK_TIMES

////////////////////////////////////////////////////////////////////////////////////////////////////
// app control

#define _APPID						GFA_APPCTRL_APPID_MQTTCL
#define _APPNAME					"MqttCl"
#define _DEPENDENCIES				((appid_t)(GFA_APPCTRL_APPID_REMANENT))

////////////////////////////////////////////////////////////////////////////////////////////////////
//

#define _UPDATE_INTERVAL_MS			100
#define _RECONN_INTERVAL_MS			1000
#define _LOGFILE_NAME				"mqttcl.log"

////////////////////////////////////////////////////////////////////////////////////////////////////

#define _SIG_BLOCK(s)				sigprocmask(SIG_BLOCK, (s), NULL)
#define _SIG_UNBLOCK(s)				sigprocmask(SIG_UNBLOCK, (s), NULL)

#define _NSEC_FROM_MSEC(ms)			((ms) * _PC_NS_PER_MS)
#define _USEC_FROM_MSEC(ms)			((ms) * _PC_NS_PER_US)

#define _TOPIC_CTRL_KEY_BINLE		"binLe"
#define _TOPIC_CTRL_KEY_BINBE		"binBe"
#define _TOPIC_CTRL_KEY_JSON		"json"
#define _TOPIC_CTRL_KEY_PBUF		"pBuf"
#define _TOPIC_CTRL_KEY_QOS			"qos"
#define _TOPIC_CTRL_KEY_RETAIN		"retained"
#define _TOPIC_CTRL_KEY_REM_RETAINED	"delRetained"
#define _TOPIC_CMD_CTRL				"CONTROL"
#define _TOPIC_CMD_SET				"SET"
#define _TOPIC_CMD_STATUS			"STATUS"

#define _CONNECT_MAX_RETRIES(err)	(((err) == MOSQ_ERR_EAI) ? 30 : 3)

////////////////////////////////////////////////////////////////////////////////////////////////////
//

typedef enum _TOPIC_CTRL_CMD
{
	TCC_Control,
	TCC_SetBinLe,
	TCC_SetBinBe,
	TCC_SetJson,
	TCC_SetPBuf,
	TCC_Status
}TOPIC_CTRL_CMD, *LPTOPIC_CTRL_CMD;
typedef const TOPIC_CTRL_CMD *LPCTOPIC_CTRL_CMD;

////////////////////////////////////////////////////////////////////////////////////////////////////
//

typedef enum _MQTT_CLIENT_STATES // when modifying, don't forget to adjust g_pszStateNames!!!
{
	CLS_NotInit,
	CLS_SetLastWill,
	CLS_SetTLS,
	CLS_Unconnected,
	CLS_Connect,
	CLS_Reconnect,
	CLS_Connecting,
	CLS_Connected,
	CLS_Subscribe,
	CLS_Subscribing,
	CLS_Subscribed,
	CLS_PublishConnect,
	CLS_ProcMsg,
	CLS_PublishDisconnect,
	CLS_Err,
	CLS_ShutDown,
	CLS_Unsubscribe,
	CLS_Disconnect,
	CLS_Cleanup,
	CLS_Paused,
	CLS_Exit
}MQTT_CLIENT_STATES, *LPMQTT_CLIENT_STATES;
typedef const MQTT_CLIENT_STATES *LPCMQTT_CLIENT_STATES;

static const char *g_pszStateNames[] =
{
	"Not Init",
	"Set Last Will",
	"Set TLS",
	"Unconnected",
	"Connect",
	"Reconnect",
	"Connecting",
	"Connected",
	"Subscribe",
	"Subscribing",
	"Subscribed",
	"Publish Connect",
	"ProcMsg",
	"Publish Disconnect",
	"Error",
	"ShutDown",
	"Unsubscribe",
	"Disconnect",
	"Cleanup",
	"Paused",
	"Exit"
};

static const char * _GetClientStateString(MQTT_CLIENT_STATES cs)
{
	if(cs >= CLS_NotInit && cs <= CLS_Exit)
		return g_pszStateNames[cs];
	return "";
}

////////////////////////////////////////////////////////////////////////////////////////////////////
//

typedef struct _SUB_CTRL_TOPIC
{
	_SUB_CTRL_TOPIC(const std::string &&s) : sTopic(s)
	{
		this->nVarOffset = s.length() - 2;
	}
	std::string sTopic;
	size_t nVarOffset;
}SUB_CTRL_TOPIC, *LPSUB_CTRL_TOPIC;
typedef const SUB_CTRL_TOPIC *LPCSUB_CTRL_TOPIC;

////////////////////////////////////////////////////////////////////////////////////////////////////
//

//static std::string _CreateDeviceID(void);

static volatile bool				g_fRun			= false;
static volatile bool				g_fPauseImp		= false;
static volatile bool				g_fPauseCmd		= false;
static volatile bool				g_fZombie		= false;
static appid_t						g_nDepRunning	= 0;
static sigset_t						g_set;
static CLogfile						g_lf;
static int							g_nLastSig		= -1;
static shm_t						g_shmShadow;
static MQTT_CLIENT_STATES			g_cs			= CLS_NotInit;
static MQTT_CLIENT_STATES			g_csLast		= CLS_NotInit;
static bool							g_bConnected	= false;
static int							g_nSubcribed	= 0;
static bool							g_bIntr			= false;
static int							g_nErrRetries	= 0;

////////////////////////////////////////////////////////////////////////////////////////////////////
//

static const char* _GetBaseDir(std::string &rstrBaseDir)
{
	char szBaseDir[PATH_MAX];
	rstrBaseDir = ::GetAppDirectory(szBaseDir, sizeof(szBaseDir));
	rtrim(rstrBaseDir, "/");
	return rstrBaseDir.c_str();
}

////////////////////////////////////////////////////////////////////////////////////////////////////
//

static void _SigHandler(int sig)
{
	g_nLastSig = sig;
	g_bIntr = true;
	g_fPauseImp = g_fPauseCmd = g_fZombie = false;
}

////////////////////////////////////////////////////////////////////////////////////////////////////
//

static MQTT_CLIENT_STATES _cl_usleep(unsigned int t, MQTT_CLIENT_STATES csNext)
{
	if(usleep(t) < 0 && errno == EINTR)
		return CLS_ShutDown;
	return csNext;
}

////////////////////////////////////////////////////////////////////////////////////////////////////
//

static void _ProcessIncoming(CMqttClient &rcl, CMqttVarTable &vt, CMqttClConfig &cfg, LPCSUB_CTRL_TOPIC pCtrlMap)
{
	CMqttVar *pVar;
	CMqttMessage *pMsg;
	std::string sVarPath;

	while((pMsg = rcl.PopRcvMsg()))
	{
		if(pMsg->TopicMatchesSub(pCtrlMap[TCC_Control].sTopic.c_str()))
		{
			sVarPath = pMsg->GetTopic(pCtrlMap[TCC_Control].nVarOffset);

			if((pVar = vt.Find(sVarPath.c_str())))
			{
				bool bChanged = false;
				int nType, nQos;
				CJson_t jtRoot, jtVal;
				std::string err;
				uint32_t nMaskOn = 0, nMaskOff = 0;

				if(pMsg->GetPayloadAsJSON(jtRoot, err))
				{
					if(jtRoot.GetValue(_TOPIC_CTRL_KEY_RETAIN, jtVal))
					{
						switch((nType = jtVal.Type()))
						{
						case JSON_TRUE:
							bChanged = pVar->SetRetained(true) || bChanged;
							break;
						case JSON_FALSE:
							bChanged = pVar->SetRetained(false) || bChanged;
							break;
						default:
							g_lf.Error("%s: Invalid data type for JSON key '%s': %d\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_RETAIN, nType);
							break;
						}
					}

					if(jtRoot.GetValue(_TOPIC_CTRL_KEY_REM_RETAINED, jtVal))
					{
						switch((nType = jtVal.Type()))
						{
						case JSON_TRUE:
							pVar->RemoveRetained(cfg.GetTopicPrefix(), nullptr, rcl.GetMsgQueueSnd(), true);
							break;
						case JSON_FALSE:
							g_lf.Warning("%s: command \"%s\":false has no effect!\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_REM_RETAINED);
							break;
						default:
							g_lf.Error("%s: Invalid data type for JSON key '%s': %d\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_REM_RETAINED, nType);
							break;
						}
					}

					if(jtRoot.GetValue(_TOPIC_CTRL_KEY_QOS, jtVal))
					{
						switch((nType = jtVal.Type()))
						{
						case JSON_INTEGER:
							nQos = (int)json_integer_value(jtVal);
							if(nQos < MQTTCL_MIN_QOS)
								g_lf.Warning("%s: Invalid value for QOS: %d! Value adjusted to %d\n", pMsg->GetTopic().c_str(), nQos, MQTTCL_MIN_QOS);
							else if(nQos > MQTTCL_MAX_QOS)
								g_lf.Warning("%s: Invalid value for QOS: %d! Value adjusted to %d\n", pMsg->GetTopic().c_str(), nQos, MQTTCL_MAX_QOS);
							bChanged = pVar->SetQoS(nQos) || bChanged;
							break;
						default:
							g_lf.Error("%s: Invalid data type for JSON key '%s': %d\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_QOS, nType);
							break;
						}
					}

					if(jtRoot.GetValue(_TOPIC_CTRL_KEY_BINLE, jtVal))
					{
						switch((nType = jtVal.Type()))
						{
						case JSON_TRUE:
							nMaskOn |= MQTT_VALUE_BINLE;
							break;
						case JSON_FALSE:
							nMaskOff |= MQTT_VALUE_BINLE;
							break;
						default:
							g_lf.Error("%s: Invalid data type for JSON key '%s': %d\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_BINLE, nType);
							break;
						}
					}

					if(jtRoot.GetValue(_TOPIC_CTRL_KEY_BINBE, jtVal))
					{
						switch((nType = jtVal.Type()))
						{
						case JSON_TRUE:
							nMaskOn |= MQTT_VALUE_BINBE;
							break;
						case JSON_FALSE:
							nMaskOff |= MQTT_VALUE_BINBE;
							break;
						default:
							g_lf.Error("%s: Invalid data type for JSON key '%s': %d\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_BINBE, nType);
							break;
						}
					}

					if(jtRoot.GetValue(_TOPIC_CTRL_KEY_JSON, jtVal))
					{
						switch((nType = jtVal.Type()))
						{
						case JSON_TRUE:
							nMaskOn |= MQTT_VALUE_JSON;
							break;
						case JSON_FALSE:
							nMaskOff |= MQTT_VALUE_JSON;
							break;
						default:
							g_lf.Error("%s: Invalid data type for JSON key '%s': %d\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_JSON, nType);
							break;
						}
					}

					if(jtRoot.GetValue(_TOPIC_CTRL_KEY_PBUF, jtVal))
					{
						switch((nType = jtVal.Type()))
						{
						case JSON_TRUE:
							nMaskOn |= MQTT_VALUE_PBUF;
							break;
						case JSON_FALSE:
							nMaskOff |= MQTT_VALUE_PBUF;
							break;
						default:
							g_lf.Error("%s: Invalid data type for JSON key '%s': %d\n", pMsg->GetTopic().c_str(), _TOPIC_CTRL_KEY_PBUF, nType);
							break;
						}
					}

					if(nMaskOff)
					{
						if(pVar->DisablePublish(nMaskOff, &vt))
						{
							bChanged = true;
				        }
					}

					if(nMaskOn)
					{
						if(pVar->EnablePublish(nMaskOn, &vt))
						{
							bChanged = true;
				        }
					}

#if _DUMP_ENABLED_VARS
					if(bChanged)
			            vt.DumpPubEnabled();
#endif	//	_DUMP_ENABLED_VARS
				}
				else
				{
					g_lf.Error("%s: JSON error: %s!\n", pMsg->GetTopic().c_str(), err.c_str());
				}
			}
		}
		else
		{
			int nLocks = 0;
			static const uint32_t nFormats[] =
			{
				0,
				MQTT_VALUE_BINLE,
				MQTT_VALUE_BINBE,
				MQTT_VALUE_JSON,
				MQTT_VALUE_PBUF
			};

			for(int i = TCC_SetBinLe; i <= TCC_SetPBuf; i++)
			{
				if(pMsg->TopicMatchesSub(pCtrlMap[i].sTopic.c_str()))
				{
					sVarPath = pMsg->GetTopic(pCtrlMap[i].nVarOffset);

					if((pVar = vt.Find(sVarPath.c_str())))
					{
						if(pVar->PublishEnabled())
						{
							if(!pVar->SetShmValue(nFormats[i], pMsg, nLocks))
							{
								// !!!
							}
						}
						else
						{
							// !!!
						}

						break;
					}
					else
					{
						// !!!
						break;
					}
				}
			}
		}

		pMsg->Release();
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
//

static int _ProcessOutgoing(CMqttClient &rcl)
{
	int nRet = 0;
	CMqttMessage *pMsg;

	while((pMsg = rcl.PopSndMsg()))
	{
		rcl.publish(pMsg);
		pMsg->Release();
		++nRet;
	}

	return nRet;
}

////////////////////////////////////////////////////////////////////////////////////////////////////
//

static int _Subscribe(CMqttClient &rcl, int nDefaultQOS, LPCSUB_CTRL_TOPIC pCtrlMap, size_t nLenMap)
{
	int nRet;

	for(size_t i = 0; i < nLenMap; i++)
	{
		if((nRet = rcl.subscribe(NULL, pCtrlMap[i].sTopic.c_str(),  nDefaultQOS)) != MOSQ_ERR_SUCCESS)
			break;
		TRACE("Subscribed: '%s' - QOS: %d\n", pCtrlMap[i].sTopic.c_str(), nDefaultQOS);
	}

	return nRet;
}

static void _Unsubscribe(CMqttClient &rcl, LPCSUB_CTRL_TOPIC pCtrlMap, size_t nLenMap)
{
	for(size_t i = 0; i < nLenMap; i++)
	{
		rcl.unsubscribe(NULL, pCtrlMap[i].sTopic.c_str());
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////
//

static void _OnClientEvents(LPCMQTT_GENERIC_NOTIFICATION pntf, void *pctx)
{
	switch(pntf->evt)
	{
	case NEVT_Log:
		if(pntf->log.level == MOSQ_LOG_ERR)
		{
			TRACE("[%d] - %s\n", pntf->log.level, pntf->log.str);
			g_lf.Error("%s\n", pntf->log.str);
		}
		break;

	case NEVT_Connect:
		if(pntf->con.rc == MOSQ_ERR_SUCCESS)
			g_bConnected = true;
		break;

	case NEVT_Disconnect:
		break;

	case NEVT_Subscribe:
		++g_nSubcribed;
		break;

	case NEVT_Unsubscribe:
		break;

	default:
		break;
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////

static void _ProcessCtrlMessages(HAPPCTRL hAC, HAPPINFO hAI)
{
    ctrlmsg_t nCtrlMsg;

	while(!g_bIntr && (nCtrlMsg = ::GfaIpcAppCtrlGetNextCtrlMsg(hAI)))
	{
		switch(nCtrlMsg)
		{
		case GFA_APPCTRL_CTRLMSG_STOP:
			g_bIntr = true;
			g_fPauseImp = false;
			g_fPauseCmd = false;
			g_fZombie = false;
			g_lf.Info("Received Control Message 'Stop'\n");
			break;
		case GFA_APPCTRL_CTRLMSG_PAUSE:
			if(!g_fPauseCmd)
			{
				g_fPauseCmd = true;
				if(!g_fPauseImp)
				{
					::GfaIpcAppCtrlSetState(hAC, GIAS_Paused);
					g_lf.Info("Received Control Message 'Pause'\n");
					g_lf.Info("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(GIAS_Paused));
					TRACE("%-8s: State: %s\n", "Me", ::GfaIpcAppCtrlGetStateText(GIAS_Paused));
				}
			}
			break;
		case GFA_APPCTRL_CTRLMSG_RESUME:
			if(g_fPauseCmd)
			{
				g_fPauseCmd = false;
				if(!g_fPauseImp)
				{
					g_lf.Info("Received Control Message 'Resume'\n");
					g_lf.Info("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(GIAS_Running));
					::GfaIpcAppCtrlSetState(hAC, GIAS_Running);
					TRACE("%-8s: State: %s\n", "Me", ::GfaIpcAppCtrlGetStateText(GIAS_Running));
				}
			}
			break;
		default:
			break;
		}
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////

static void _ProcessStateEvents(HAPPCTRL hAC, HAPPINFO hAI)
{
    appid_t nAppIdSrc;
    bool fOldPaused = g_fPauseImp;
	char szDispName[128];

	while(!g_bIntr && (nAppIdSrc = ::GfaIpcAppCtrlGetNextStateEvtSrc(hAI)))
	{
		GfaIpcAppStates state = ::GfaIpcAppCtrlGetState(hAC, nAppIdSrc);
		GfaIpcAppCtrlGetDisplayName(hAC, nAppIdSrc, szDispName, sizeof(szDispName));
		TRACE("%-8s: State: %s\n", szDispName, ::GfaIpcAppCtrlGetStateText(state));

		if(nAppIdSrc & _DEPENDENCIES)
		{
			if(state == GIAS_Running)
			{
				g_lf.Info("%s -> %s.\n", szDispName, ::GfaIpcAppCtrlGetStateText(state));
				g_nDepRunning |= nAppIdSrc;
			}
			else
			{
				g_lf.Warning("%s -> %s.\n", szDispName, ::GfaIpcAppCtrlGetStateText(state));
				g_nDepRunning &= ~nAppIdSrc;
			}
		}
	}

	if(!g_bIntr)
	{
		g_fPauseImp = (g_nDepRunning != _DEPENDENCIES);

		if(!g_fPauseCmd && (fOldPaused != g_fPauseImp))
		{
			fOldPaused = g_fPauseImp;
			GfaIpcAppStates newState = g_fPauseImp ? GIAS_Paused : GIAS_Running;
			::GfaIpcAppCtrlSetState(hAC, newState);
			if(g_fPauseImp)
				g_lf.Warning("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(newState));
			else
				g_lf.Info("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(newState));
		}
	}
}

static std::string _GetTopicPrefixString(const CMqttClConfig &cfg)
{
	if(cfg.TopicPrefixDisabled())
		return "";
	return formatString("%s/", cfg.GetTopicPrefix());
}

////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
//


int main(int /*argc*/, char **/*argv*/)
{
	int nRet = 0;
    CProcessInstance pi;
    std::string sDevID;
	char szLogFile[PATH_MAX];
	std::string strBaseDir;
	const char *pszBaseDir = NULL;
	HAPPCTRL hAC = NULL;
	HAPPINFO hAI;
	HSHM hShm = NULL;
	void *pShm = NULL;
	unsigned long long nUsecWorkTime = 0;
	int nTlsMode;
	CProcessClock pcWork;

    ////////////////////////////////////////////////////////////////////////////////////////////////
    // check for multiple instances

    if(!pi.LockInstance(UUID_SHM))
    {
		CLogfile::StdErr("Failed to start instance!\n");
        return -1;
    }

	////////////////////////////////////////////////////////////////////////////////////////////////
	// configure signal handling

	struct sigaction sa;
	::sigfillset(&g_set);
	sigaddset(&g_set, SIGUSR1);
	memset(&sa, 0, sizeof(sa));

	sa.sa_handler = _SigHandler;
    sigaction(SIGHUP, &sa, NULL);	// handles user's terminal disconnect
    sigaction(SIGQUIT, &sa, NULL);	// handles Ctrl + '\'
	sigaction(SIGTERM, &sa, NULL);	// handles normal termination
	sigaction(SIGABRT, &sa, NULL);	// handles abnormal termination (i.e. abort())
	sigaction(SIGINT, &sa, NULL);	// handles Ctrl + 'C'

	sa.sa_handler = SIG_IGN;
    sigaction(SIGTSTP, &sa, NULL);	// ignores Ctrl + 'Z'
    sigaction(SIGSTOP, &sa, NULL);	// ignores Stop
    sigaction(SIGCONT, &sa, NULL);	// ignores Continue
    sigaction(SIGCHLD, &sa, NULL);	// ignores child process termination
    sigaction(0, &sa, NULL);		// ignores shell termination

	do
	{
		g_fZombie = true;

		////////////////////////////////////////////////////////////////////////////////////////////
		// get the base directory for output files

		if(!pszBaseDir)
			pszBaseDir = _GetBaseDir(strBaseDir);

		CLogfile::StdOut("Using base directory \"%s\".\n", pszBaseDir);

		////////////////////////////////////////////////////////////////////////////////////////////
		// initialize log file

		sprintf(szLogFile, "%s/%s", pszBaseDir, _LOGFILE_NAME);

		if(!g_lf.Open(szLogFile))
		{
			CLogfile::StdErr("Failed to create/open log file!\n");
			nRet = -1;
			break;
		}

		g_lf.Info("Process started.\n");

		////////////////////////////////////////////////////////////////////////////////////////////
		// initialize app control

		g_lf.Info("Acquire AppCtrl-Handle.\n");

		if(!(hAC = ::GfaIpcAppCtrlAcquire(_APPID, _APPNAME, _USEC_FROM_MSEC(_UPDATE_INTERVAL_MS), _USEC_FROM_MSEC(_RECONN_INTERVAL_MS) * 3)))
		{
			g_lf.Error("Failed to acquire AppCtrl-Handle!\n");
			break;
		}

		::GfaIpcAppCtrlSetState(hAC, GIAS_Initializing);
		g_lf.Info("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(GIAS_Initializing));

		if(!::GfaIpcAppCtrlSubscribeStateEvents(hAC, _DEPENDENCIES))
		{
			g_lf.Error("Failed to subscribe state event notifications!\n");
			break;
		}

		////////////////////////////////////////////////////////////////////////////////////////////
		// parse the config file

	    CMqttClConfig cfg(UUID_SHM);

#ifdef MQTTCL_CONFIG_FILE_PATH
	std::string strMqttCfg = MQTTCL_CONFIG_FILE_PATH;
#else	//	MQTTCL_CONFIG_FILE_PATH
	char szBaseDir[PATH_MAX];
	::GetAppDirectory(szBaseDir, sizeof(szBaseDir));
	std::string strMqttCfg = formatString("%s/cfg/mqttcl.cfg.json", szBaseDir);
#endif	//	MQTTCL_CONFIG_FILE_PATH
	    if(!cfg.LoadCfg(strMqttCfg.c_str(), g_lf))
	    {
			nRet = -1;
			break;
	    }

		nTlsMode = cfg.GetTLSMode();
//		TRACE("%s/%s\n", cfg.GetDeviceID(), cfg.GetShmID());
		std::string strTopicPrefix = _GetTopicPrefixString(cfg);

		////////////////////////////////////////////////////////////////////////////////////////////
		// client control topic map

		const SUB_CTRL_TOPIC subCtrlMap[] =
		{
			formatString("%s%s/#", strTopicPrefix.c_str(), _TOPIC_CMD_CTRL),
			formatString("%s%s/%s/#", strTopicPrefix.c_str(), MQTT_TOPIC_VALUE_BINLE, _TOPIC_CMD_SET),
			formatString("%s%s/%s/#", strTopicPrefix.c_str(), MQTT_TOPIC_VALUE_BINBE, _TOPIC_CMD_SET),
			formatString("%s%s/%s/#", strTopicPrefix.c_str(), MQTT_TOPIC_VALUE_JSON, _TOPIC_CMD_SET),
			formatString("%s%s/%s/#", strTopicPrefix.c_str(), MQTT_TOPIC_VALUE_PBUF, _TOPIC_CMD_SET),
//			formatString("%s%s/#", strTopicPrefix.c_str(), _TOPIC_CMD_STATUS)
		};

		////////////////////////////////////////////////////////////////////////////////////////////

	    if(!(hShm = ::acquire_shm(sizeof(shm_t), 1)))
	    {
			g_lf.Error("GfaIpcAcquireSHM failed!\n");
	    	break;
	    }

		g_lf.Info("Acquired SHM Handle.\n");

        if(!(pShm = ::GfaIpcAcquirePointer(hShm)))
        {
			g_lf.Error("GfaIpcAcquirePointer failed!\n");
        	break;
        }

		g_lf.Info("Acquired SHM Pointer.\n");
        ::GfaIpcDumpSHMROT();

    	memcpy(&g_shmShadow, (const shm_t*)pShm, sizeof(shm_t));

		////////////////////////////////////////////////////////////////////////////////////////////

    	int nErr, nLocked = 0, nNumConn = 0;
		bool bReconnect, bConnPending;
		std::string strErr;
    	CMqttVarTable vtbl;
    	CShm_t shm(pShm, &g_shmShadow, hShm, NULL, -1, 0, cfg.GetDefaultQOS(), cfg.GetDefaultRetain());
        shm.InitPath(NULL, NULL);
        shm.CreateMembersTable(vtbl);

#if _DUMP_ENABLED_VARS
        vtbl.DumpPubEnabled();
#endif	//	_DUMP_ENABLED_VARS

		////////////////////////////////////////////////////////////////////////////////////////////

		CMqttClient mqttCl(cfg.GetDeviceID());
		mqttCl.SetClientEventCallback(_OnClientEvents, NEVT_Connect | NEVT_Disconnect | NEVT_Subscribe | NEVT_Unsubscribe | NEVT_Message | NEVT_Log, NULL);

		g_fZombie = false;
		g_fRun = true;
		::GfaIpcAppCtrlSetState(hAC, GIAS_Running);
		g_lf.Info("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(GIAS_Running));

		while(g_fRun)
		{
			////////////////////////////////////////////////////////////////////////////////////////
			// update app control info

			if((hAI = ::GfaIpcAppCtrlInfoUpdate(hAC, nUsecWorkTime)))
			{
				_ProcessCtrlMessages(hAC, hAI);
				_ProcessStateEvents(hAC, hAI);
			}

			if(g_fPauseImp || g_fPauseCmd)
			{
				if(g_cs < CLS_ShutDown)
				{
					g_csLast = g_cs;
					g_cs = CLS_ShutDown;
				}
				else
				{
					nUsecWorkTime = 0;
				}
			}

			pcWork.ClockTrigger();

			switch(g_cs)
			{
			case CLS_NotInit:
				if((nErr = CMqttClient::Init()) == MOSQ_ERR_SUCCESS)
				{
					g_cs = CLS_SetTLS;
				}
				else if(!CMqttClient::EvalError(nErr, bReconnect, bConnPending, g_bIntr, strErr))
				{
					g_csLast = g_cs;
					g_cs = CLS_Err;
				}
				break;

			case CLS_SetTLS:
				if(nTlsMode == MQTTCL_TLS_MODE_CRT)
				{
					g_lf.Info("Using TLS with certificates.\n");

					if((nErr = mqttCl.tls_set(cfg.GetTlsCaCrtFile(), NULL, cfg.GetTlsClCrtFile(), cfg.GetTlsClKeyFile(), NULL)) != MOSQ_ERR_SUCCESS)
					{
						CMqttClient::EvalError(nErr, bReconnect, bConnPending, g_bIntr, strErr);

						if(g_bIntr)
						{
							g_csLast = g_cs;
							g_cs = CLS_ShutDown;
						}
						else
						{
							g_csLast = g_cs;
							g_cs = CLS_Err;
						}
					}
					else
					{
						g_cs = CLS_SetLastWill;
						g_lf.Info("Connecting to broker @ %s:%u ...\n", cfg.GetBrokerAddr(), cfg.GetBrokerPort());
					}
				}
				else if(nTlsMode == MQTTCL_TLS_MODE_PSK)
				{
					g_lf.Info("Using TLS with PSK.\n");

					if((nErr = mqttCl.tls_psk_set(cfg.GetTlsPSK(), cfg.GetDeviceID(), NULL)) != MOSQ_ERR_SUCCESS)
					{
						CMqttClient::EvalError(nErr, bReconnect, bConnPending, g_bIntr, strErr);

						if(g_bIntr)
						{
							g_csLast = g_cs;
							g_cs = CLS_ShutDown;
						}
						else
						{
							g_csLast = g_cs;
							g_cs = CLS_Err;
						}
					}
					else
					{
						g_cs = CLS_SetLastWill;
						g_lf.Info("Connecting to broker @ %s:%u ...\n", cfg.GetBrokerAddr(), cfg.GetBrokerPort());
					}
				}
				else
				{
					g_cs = CLS_SetLastWill;
					g_lf.Info("Connecting to broker @ %s:%u ...\n", cfg.GetBrokerAddr(), cfg.GetBrokerPort());
				}
				break;

			case CLS_SetLastWill:
				if(cfg.HasLastWill())
				{
					std::string strTopic = formatString("%s%s", strTopicPrefix.c_str(), cfg.GetLastWillTopic());
					if((nErr = mqttCl.will_set(strTopic.c_str(), cfg.GetLastWillMessageLength(), cfg.GetLastWillMessage(), cfg.GetLastWillQOS(), cfg.GetLastWillRetain())) != MOSQ_ERR_SUCCESS)
					{
						CMqttClient::EvalError(nErr, bReconnect, bConnPending, g_bIntr, strErr);
					}
				}
				g_cs = CLS_Unconnected;
				break;

			case CLS_Unconnected:
				if(g_bConnected)
				{
					g_bConnected = false;
					g_lf.Warning("Lost connection to broker @ %s:%u. Tying to reconnect ...\n", cfg.GetBrokerAddr(), cfg.GetBrokerPort());
				}
				if(!nNumConn)
					g_cs = CLS_Connect;
				else
					g_cs = CLS_Reconnect;
				break;

			case CLS_Connect:
				if((nErr = mqttCl.connect(cfg.GetBrokerAddr(), cfg.GetBrokerPort(), cfg.GetKeepAliveTime())) == MOSQ_ERR_SUCCESS)
					g_cs = CLS_Connecting;
				else if(!CMqttClient::EvalError(nErr, bReconnect, bConnPending, g_bIntr, strErr))
				{
					TRACE("CLS_Connect: %s\n", strErr.c_str());

					if(bConnPending)
						g_cs = CLS_Connecting;
					else if(bReconnect)
					{
						g_csLast = g_cs;
						g_cs = _cl_usleep(_USEC_FROM_MSEC(_RECONN_INTERVAL_MS), g_cs);
					}
					else if(g_bIntr)
					{
						g_csLast = g_cs;
						g_cs = CLS_ShutDown;
					}
					else
					{
						if(++g_nErrRetries > _CONNECT_MAX_RETRIES(nErr))
						{
							g_csLast = g_cs;
							g_cs = CLS_Err;
						}
						else
						{
							g_cs = _cl_usleep(_USEC_FROM_MSEC(_RECONN_INTERVAL_MS), g_cs);
						}
					}
				}
				break;

			case CLS_Reconnect:
				if((nErr = mqttCl.reconnect()) == MOSQ_ERR_SUCCESS)
					g_cs = CLS_Connecting;
				else if(!CMqttClient::EvalError(nErr, bReconnect, bConnPending, g_bIntr, strErr))
				{
					TRACE("CLS_Reconnect: %s\n", strErr.c_str());

					if(bConnPending)
						g_cs = CLS_Connecting;
					else if(bReconnect)
					{
						g_csLast = g_cs;
						g_cs = _cl_usleep(_USEC_FROM_MSEC(_RECONN_INTERVAL_MS), g_cs);
					}
					else if(g_bIntr)
					{
						g_csLast = g_cs;
						g_cs = CLS_ShutDown;
					}
					else
					{
						if(++g_nErrRetries > _CONNECT_MAX_RETRIES(nErr))
						{
							g_csLast = g_cs;
							g_cs = CLS_Err;
						}
						else
						{
							g_cs = _cl_usleep(_USEC_FROM_MSEC(_RECONN_INTERVAL_MS), g_cs);
						}
					}
				}
				break;

			case CLS_Connecting:
				g_nErrRetries = 0;
				if(!mqttCl.TimedLoop(_NSEC_FROM_MSEC(_UPDATE_INTERVAL_MS), nErr, bReconnect, bConnPending, g_bIntr, strErr))
				{
					TRACE("CLS_Connecting: %s\n", strErr.c_str());

					if(bReconnect)
					{
						g_csLast = g_cs;
						g_cs = _cl_usleep(_USEC_FROM_MSEC(_RECONN_INTERVAL_MS), CLS_Unconnected);
					}
					else if(g_bIntr)
					{
						g_csLast = g_cs;
						g_cs = CLS_ShutDown;
					}
					else if(!bConnPending)
					{
						g_csLast = g_cs;
						g_cs = CLS_Err;
					}
				}
				else if(g_bConnected)
				{
					g_cs = CLS_Connected;
				}
				break;

			case CLS_Connected:
				TRACE("Connected to broker @ %s:%u.\n", cfg.GetBrokerAddr(), cfg.GetBrokerPort());
				g_lf.Info("Connected to broker @ %s:%u.\n", cfg.GetBrokerAddr(), cfg.GetBrokerPort());
				++nNumConn;
				g_nSubcribed = 0;
				g_cs = CLS_Subscribe;
				break;

			case CLS_Subscribe:
				g_lf.Info("Subscribing control-topics ...\n");
				if((nErr = _Subscribe(mqttCl, cfg.GetDefaultQOS(), subCtrlMap, _COUNTOF(subCtrlMap))) == MOSQ_ERR_SUCCESS)
					g_cs = CLS_Subscribing;
				else if(!CMqttClient::EvalError(nErr, bReconnect, bConnPending, g_bIntr, strErr))
				{
					if(bConnPending)
						g_cs = CLS_Connecting;
					else if(bReconnect)
						g_cs = CLS_Unconnected;
					else if(g_bIntr)
					{
						g_csLast = g_cs;
						g_cs = CLS_ShutDown;
					}
					else
					{
						g_csLast = g_cs;
						g_cs = CLS_Err;
					}
				}

				break;

			case CLS_Subscribing:
				if(!mqttCl.TimedLoop(_NSEC_FROM_MSEC(_UPDATE_INTERVAL_MS), nErr, bReconnect, bConnPending, g_bIntr, strErr))
				{
					if(bReconnect)
						g_cs = CLS_Unconnected;
					else if(bConnPending)
						g_cs = CLS_Connecting;
					else if(g_bIntr)
					{
						g_csLast = g_cs;
						g_cs = CLS_ShutDown;
					}
					else
					{
						g_csLast = g_cs;
						g_cs = CLS_Err;
					}
				}
				else if(g_nSubcribed == _COUNTOF(subCtrlMap))
				{
					g_cs = CLS_Subscribed;
				}
				break;

			case CLS_Subscribed:
				g_lf.Info("Subscriptions acknowledged.\n");
				g_lf.Info("Enter SHM processing loop ...\n");
				g_cs = CLS_PublishConnect;
				break;

			case CLS_PublishConnect:
				if(cfg.HasConnectMsg())
				{
					std::string strTopic = formatString("%s%s", strTopicPrefix.c_str(), cfg.GetConnectTopic());
					CMqttMessage *pMsg = CMqttMessage::CreateMessage(strTopic.c_str(), cfg.GetConnectMessage(), cfg.GetConnectMessageLength(), cfg.GetConnectQOS(), cfg.GetConnectRetain());
					mqttCl.publish(pMsg);
					pMsg->Release();
				}
				g_cs = CLS_ProcMsg;
				break;

			case CLS_ProcMsg:
				if(mqttCl.TimedLoop(_NSEC_FROM_MSEC(_UPDATE_INTERVAL_MS), nErr, bReconnect, bConnPending, g_bIntr, strErr))
				{
#if _TRACK_TIMES
					std::string s1, s2;
					pc_time64_t elapsed;
					g_nDbgCounter1 = g_nDbgCounter2 = g_nDbgCounter3 = 0;
					g_pc.ClockTrigger();
#endif	//	_TRACK_TIMES

					_ProcessIncoming(mqttCl, vtbl, cfg, subCtrlMap);

#if _TRACK_TIMES
					if(g_nDbgCounter1)
					{
						elapsed = g_pc.ClockGetElapsed();
						s1 = CProcessClock::Interval2String(elapsed);
						s2 = CProcessClock::Interval2String(elapsed / g_nDbgCounter1);
						TRACE("_ProcessIncoming (%lu variables): %s (%s per var)\n", g_nDbgCounter1, s1.c_str(), s2.c_str());
					}
					g_pc.ClockTrigger();
#endif	//	_TRACK_TIMES

					_SIG_BLOCK(&g_set);
					vtbl.CheckShmAndPublish(cfg.GetTopicPrefix(), nullptr, mqttCl.GetMsgQueueSnd(), nLocked);
					_SIG_UNBLOCK(&g_set);
#if _TRACK_TIMES
					g_nDbgCounter2 = mqttCl.GetMsgQueueSnd().Size();
					if(g_nDbgCounter2)
					{
						elapsed = g_pc.ClockGetElapsed();
						s1 = CProcessClock::Interval2String(elapsed);
						s2 = CProcessClock::Interval2String(elapsed / g_nDbgCounter2);
						TRACE("CheckShmAndPublish (%lu variables): %s (%s per var)\n", g_nDbgCounter2, s1.c_str(), s2.c_str());
						g_pc.ClockTrigger();
					}
					g_nDbgCounter3 =
#endif	//	_TRACK_TIMES

					_ProcessOutgoing(mqttCl);

#if _TRACK_TIMES
					if(g_nDbgCounter3)
					{
						elapsed = g_pc.ClockGetElapsed();
						s1 = CProcessClock::Interval2String(elapsed);
						s2 = CProcessClock::Interval2String(elapsed / g_nDbgCounter3);
						TRACE("_ProcessOutgoing (%lu variables): %s (%s per var)\n", g_nDbgCounter3, s1.c_str(), s2.c_str());
					}
#endif	//	_TRACK_TIMES
				}
				else
				{
					if(bReconnect)
						g_cs = CLS_Unconnected;
					else if(bConnPending)
						g_cs = CLS_Connecting;
					else if(g_bIntr)
					{
						g_csLast = g_cs;
						g_cs = CLS_PublishDisconnect;
					}
					else
					{
						g_csLast = g_cs;
						g_cs = CLS_Err;
					}
				}
				break;

			case CLS_Err:
				g_lf.Error("[%s] - %s\n", _GetClientStateString(g_csLast), strErr.c_str());
				TRACE("[%s] - %s\n", _GetClientStateString(g_csLast), strErr.c_str());
				g_fZombie = true;
				g_cs = CLS_PublishDisconnect;
				break;
			
			case CLS_PublishDisconnect:
				if(cfg.HasLastWillOnExit())
				{
					std::string strTopic = formatString("%s%s", strTopicPrefix.c_str(), cfg.GetLastWillTopic());
					CMqttMessage *pMsg = CMqttMessage::CreateMessage(strTopic.c_str(), cfg.GetLastWillOnExitMessage(), cfg.GetLastWillOnExitMessageLength(), cfg.GetLastWillQOS(), cfg.GetLastWillRetain());
					mqttCl.publish(pMsg);
					pMsg->Release();
					bool bDummy = false;
					mqttCl.TimedLoop(_NSEC_FROM_MSEC(_UPDATE_INTERVAL_MS), nErr, bDummy, bDummy, bDummy, strErr);
				}
				g_cs = CLS_Disconnect;
				break;

			case CLS_ShutDown:
				if(g_bIntr && g_nLastSig >= 0)
				{
					g_lf.Info("Received signal '%s'.\n", strsignal(g_nLastSig));
					g_nLastSig = -1;
				}
				g_lf.Info("Process shutting down ...\n");
				if(g_csLast >= CLS_Subscribed)
					g_cs = CLS_Unsubscribe;
				else if(g_csLast >= CLS_Connected)
					g_cs = CLS_Disconnect;
				else if(g_csLast > CLS_NotInit)
					g_cs = CLS_Cleanup;
				else if((g_fPauseImp || g_fPauseCmd) && !g_bIntr)
					g_cs = CLS_Paused;
				else
					g_cs = CLS_Exit;
				break;

			case CLS_Unsubscribe:
				g_lf.Info("Unsubscribe control-topics.\n");
				_Unsubscribe(mqttCl, subCtrlMap, _COUNTOF(subCtrlMap));
				g_nSubcribed = 0;
				g_cs = CLS_Disconnect;
				break;

			case CLS_Disconnect:
				g_lf.Info("Disconnect from broker @ %s:%u.\n", cfg.GetBrokerAddr(), cfg.GetBrokerPort());
				mqttCl.disconnect();
				g_bConnected = false;
				g_cs = CLS_Cleanup;
				break;

			case CLS_Cleanup:
				g_lf.Info("Mqtt clean up.\n");
				CMqttClient::Cleanup();
				if((g_fPauseImp || g_fPauseCmd) && !g_bIntr)
					g_cs = CLS_Paused;
				else
					g_cs = CLS_Exit;
				break;

			case CLS_Paused:
				if(!g_fPauseImp && !g_fPauseCmd)
				{
					if(!g_bIntr)
						g_cs = CLS_NotInit;
					else
						g_cs = CLS_Exit;
				}
				else
				{
					usleep(_USEC_FROM_MSEC(_UPDATE_INTERVAL_MS));
					continue;
				}
				break;

			case CLS_Exit:
				g_fRun = false;
				break;
			}

			nUsecWorkTime = pcWork.ClockGetElapsed() / 1000;
		}
	}
	while(false);

	////////////////////////////////////////////////////////////////////////////////////////////////

	if(hShm)
	{
		if(pShm)
		{
			g_lf.Info("Release SHM Pointer.\n");
			::GfaIpcReleasePointer(hShm, pShm);
		}

		g_lf.Info("Release SHM Handle.\n");
	    ::GfaIpcReleaseSHM(hShm);
    }

	if(g_fZombie)
	{
		if(hAC)
			::GfaIpcAppCtrlSetState(hAC, GIAS_Zombie);
		TRACE("Enter Zombie state ...\n");
		g_lf.Warning("Enter Zombie state ...\n");
		g_lf.Flush();
		pause();

		if(g_nLastSig >= 0)
			g_lf.Info("Received signal '%s'.\n", strsignal(g_nLastSig));
	}

	if(hAC)
	{
		g_lf.Info("Enter state %s ...\n", ::GfaIpcAppCtrlGetStateText(GIAS_Terminating));
		::GfaIpcAppCtrlSetState(hAC, GIAS_Terminating);
		g_lf.Info("Releasing App Control ...\n");
		::GfaIpcAppCtrlRelease(hAC);
	}

	g_lf.Info("Process exit.\n\n");
	g_lf.Close();
	CLogfile::StdErr("MqttCl exit.\n");
	return nRet;
}