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add ping support to MQTT project

#include "global.h"
#include "mqttd.h"
#include "rtlm.h"
#include "mqttd_calls.h"


int
cmdPUBLISH(void *srv, void *arg)
{
	struct mqtthdr *hdr;
	struct tagSession *sess = (struct tagSession*) arg;

	ioTRACE(2);

	if (!sess)
		return -1;

	hdr = (struct mqtthdr*) sess->sess_buf->msg_base;
	switch (hdr->mqtt_msg.qos) {
		case MQTT_QOS_ONCE:
			break;
		case MQTT_QOS_ACK:
			break;
		case MQTT_QOS_EXACTLY:
			break;
		default:
			ioDEBUG(1, "Error:: Unknown QoS %d - rejected publishing request", 
					hdr->mqtt_msg.qos);
			return 0;
	}

	return 0;
}

int
cmdPUBREL(void *srv, void *arg)
{
	struct mqtthdr *hdr;
	struct tagSession *sess = (struct tagSession*) arg;

	ioTRACE(2);

	if (!sess)
		return -1;

	hdr = (struct mqtthdr*) sess->sess_buf->msg_base;

	return 0;
}

int
cmdSUBSCRIBE(void *srv, void *arg)
{
	struct mqtthdr *hdr;
	struct tagSession *sess = (struct tagSession*) arg;

	ioTRACE(2);

	if (!sess)
		return -1;

	hdr = (struct mqtthdr*) sess->sess_buf->msg_base;

	return 0;
}

int
cmdUNSUBSCRIBE(void *srv, void *arg)
{
	struct mqtthdr *hdr;
	struct tagSession *sess = (struct tagSession*) arg;

	ioTRACE(2);

	if (!sess)
		return -1;

	hdr = (struct mqtthdr*) sess->sess_buf->msg_base;

	return 0;
}

int
cmdPINGREQ(void *srv, void *arg)
{
	struct mqtthdr *hdr;
	struct tagSession *sess = (struct tagSession*) arg;
	int siz = 0;

	ioTRACE(2);

	if (!sess)
		return -1;

	hdr = (struct mqtthdr*) sess->sess_buf->msg_base;
	siz = mqtt_msgPINGRESP(sess->sess_buf);
	if (siz == -1) {
		ioDEBUG(5, "Error:: in msgPINGRESP #%d - %s", mqtt_GetErrno(), mqtt_GetError());
		return 0;
	}
	if ((siz = send(sess->sess_sock, sess->sess_buf->msg_base, siz, 0)) == -1) {
		ioSYSERR(0);
		return 0;
	} else
		ioDEBUG(5, "Sended %d bytes.", siz);

	return 0;
}

int
cmdCONNECT(void *srv, void *arg)
{
	struct tagStore *store;
	struct tagSession *sess = (struct tagSession*) arg;

	ioTRACE(2);

	if (!sess)
		return -1;

	pthread_mutex_lock(&mtx_sess);
	TAILQ_REMOVE(&Sessions, sess, sess_node);
	pthread_mutex_unlock(&mtx_sess);

	if (call.FiniSessPUB)
		call.FiniSessPUB(&cfg, pub, sess->sess_cid, sess->sess_user, "%");

	pthread_mutex_lock(&sess->sess_mtx);
	while ((store = TAILQ_FIRST(&sess->sess_sndqueue))) {
		TAILQ_REMOVE(&sess->sess_sndqueue, store, st_node);

		if (store->st_subscr.sub_topic.msg_base)
			free(store->st_subscr.sub_topic.msg_base);
		if (store->st_subscr.sub_value.msg_base)
			free(store->st_subscr.sub_value.msg_base);

		free(store);
	}
	pthread_mutex_unlock(&sess->sess_mtx);

	if (sess->sess_will.msg)
		free(sess->sess_will.msg);
	if (sess->sess_will.topic)
		free(sess->sess_will.topic);

	call.LOG(logg, "Session %s stopped from %s for user %s.\n", sess->sess_cid, 
			sess->sess_addr, sess->sess_user);
	return 0;
}

int
cmdDISCONNECT(void *srv, void *arg)
{
	struct tagSession *sess = (struct tagSession*) arg;

	ioTRACE(2);

	if (!sess)
		return -1;

	pthread_mutex_lock(&mtx_sess);
	TAILQ_REMOVE(&Sessions, sess, sess_node);
	pthread_mutex_unlock(&mtx_sess);

	call.LOG(logg, "Session %s stopped from %s for user %s.\n", sess->sess_cid, 
			sess->sess_addr, sess->sess_user);
	return 0;
}