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#include <stdlib.h>
#include <stdio.h>
#include "mqtt.h"
#include "getopt.h"
struct options
{
int qos;
int retain;
const char *topic;
const char *message;
};
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);
MqttClientPublishCString(client, options->qos, options->retain,
options->topic, options->message);
if (options->qos == 0)
MqttClientDisconnect(client);
}
void onPublish(MqttClient *client, int id)
{
printf("onPublish id=%d\n", id);
MqttClientDisconnect(client);
}
void usage(const char *prog)
{
fprintf(stderr, "%s [--qos QOS] [--retain] [--topic TOPIC] [--message MESSAGE]\n",
prog);
exit(1);
}
int main(int argc, char **argv)
{
MqttClient *client;
const char *opt;
struct options options;
options.qos = 0;
options.retain = 0;
options.topic = "my/topic";
options.message = "hello, world!";
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_OPT("--retain"):
options.retain = 1;
break;
GETOPT_OPTARG("--topic"):
options.topic = optarg;
break;
GETOPT_OPTARG("--message"):
options.message = optarg;
break;
GETOPT_MISSING_ARG:
fprintf(stderr, "missing argument to: %s\n", opt);
GETOPT_DEFAULT:
usage(argv[0]);
break;
}
}
client = MqttClientNew(NULL, 1);
MqttClientSetOnConnect(client, onConnect);
MqttClientSetOnPublish(client, onPublish);
MqttClientSetUserData(client, &options);
MqttClientConnect(client, "test.mosquitto.org", 1883, 60);
MqttClientRun(client);
MqttClientFree(client);
return 0;
}
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