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#include <stdlib.h>
#include <stdio.h>
#include "mqtt.h"
#include "getopt.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)
{
(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);
}
int main(int argc, char **argv)
{
MqttClient *client;
const char *opt;
struct options options;
options.qos = 0;
options.topic = "$SYS/broker/load/messages/#";
options.clean = 1;
options.client_id = NULL;
while ((opt = GETOPT(argc, argv)) != NULL)
{
GETOPT_SWITCH(opt)
{
GETOPT_OPTARG("--qos"):
options.qos = strtol(optarg, NULL, 10);
if (options.qos < 0 || options.qos > 2)
{
fprintf(stderr, "invalid qos: %s\n", optarg);
return 1;
}
break;
GETOPT_OPTARG("--topic"):
options.topic = optarg;
break;
GETOPT_OPT("--no-clean"):
options.clean = 0;
break;
GETOPT_OPTARG("--id"):
options.client_id = optarg;
break;
GETOPT_MISSING_ARG:
fprintf(stderr, "missing argument to: %s\n", opt);
GETOPT_DEFAULT:
usage(argv[0]);
break;
}
}
client = MqttClientNew(options.client_id, options.clean);
MqttClientSetOnConnect(client, onConnect);
MqttClientSetOnSubscribe(client, onSubscribe);
MqttClientSetOnMessage(client, onMessage);
MqttClientSetUserData(client, &options);
MqttClientConnect(client, "test.mosquitto.org", 1883, 60);
MqttClientRun(client);
return 0;
}
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