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#include <stdlib.h>
#include <stdio.h>
#include "mqtt.h"
#include "optparse.h"
struct options
{
int qos;
const char *topic;
int clean;
const char *client_id;
};
void onConnect(MqttClient *client, MqttConnectionStatus status,
int sessionPresent)
{
struct options *options = (struct options *) MqttClientGetUserData(client);
(void) client;
printf("onConnect rv=%d sessionPresent=%d\n", status, sessionPresent);
MqttClientSubscribe(client, options->topic, options->qos);
}
void onSubscribe(MqttClient *client, int id, MqttSubscriptionStatus status)
{
(void) client;
printf("onSubscribe id=%d status=%d\n", id, status);
}
void onMessage(MqttClient *client, const char *topic, const void *data,
size_t size, int qos, int retain)
{
(void) client;
printf("onMessage topic=<%s> message=<%.*s>\n", topic, (int) size,
(char *) data);
// MqttClientUnsubscribe(client, topic);
}
void usage(const char *prog)
{
fprintf(stderr, "%s [--qos QOS] [--topic TOPIC] [--clean] [--id ID]\n",
prog);
exit(1);
}
static void parse_args(struct options *options, int argc, char **argv)
{
int option;
struct optparse_long longopts[] =
{
{ "qos", 'q', OPTPARSE_REQUIRED },
{ "topic", 't', OPTPARSE_REQUIRED },
{ "no-clean", 'n', OPTPARSE_NONE },
{ "id", 'i', OPTPARSE_REQUIRED },
{ "help", 'h', OPTPARSE_NONE },
{ NULL }
};
struct optparse parser;
optparse_init(&parser, argv);
while ((option = optparse_long(&parser, longopts, NULL)) != -1)
{
switch (option)
{
case 'q':
options->qos = strtol(parser.optarg, NULL, 10);
if (options->qos < 0 || options->qos > 2)
{
fprintf(stderr, "invalid qos: %s\n", parser.optarg);
exit(1);
}
break;
case 't':
options->topic = parser.optarg;
break;
case 'n':
options->clean = 0;
break;
case 'i':
options->client_id = parser.optarg;
break;
case 'h':
usage(argv[0]);
break;
case '?':
fprintf(stderr, "%s: %s\n", argv[0], parser.errmsg);
usage(argv[0]);
break;
}
}
}
int main(int argc, char **argv)
{
MqttClient *client;
struct options options;
options.qos = 0;
options.topic = "$SYS/broker/load/messages/#";
options.clean = 1;
options.client_id = NULL;
parse_args(&options, argc, argv);
client = MqttClientNew(options.client_id);
MqttClientSetOnConnect(client, onConnect);
MqttClientSetOnSubscribe(client, onSubscribe);
MqttClientSetOnMessage(client, onMessage);
MqttClientSetUserData(client, &options);
MqttClientConnect(client, "test.mosquitto.org", 1883, 60, options.clean);
MqttClientRun(client);
MqttClientFree(client);
return 0;
}
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