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// Standard C
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// System
#include <unistd.h>
// Mosquitto
#include <mosquitto.h>
// Project
#include "config.h"
#include "mqtt.h"
#ifndef MAX_COMMAND_LENGTH
# define MAX_COMMAND_LENGTH 100
#endif
static bool
streq(const char *lhs, const char *rhs)
{
return strcmp(lhs, rhs) == 0;
}
static void
application_cleanup(void)
{
mosquitto_lib_cleanup();
}
static void
application_init(void)
{
mosquitto_lib_init();
(void) atexit(application_cleanup);
}
static void
application_run(struct mosquitto *client)
{
char command[MAX_COMMAND_LENGTH];
for ( bool quit = false; !quit; ) {
printf("> ");
if ( fgets(command, sizeof command, stdin) == NULL ) {
quit = true;
continue;
}
// remove 'newline' symbol at the end
command[strcspn(command, "\n")] = '\0';
if ( streq(command, "") ) {
; // do nothing
}
else if ( streq(command, "quit") ) {
quit = true;
}
else if ( streq(command, "send") ) {
static const char payload[] = "ich bin ein payload";
static const char topic[] = "testtopic";
int err = mosquitto_publish(
client,
NULL,
topic,
sizeof payload,
payload,
0,
false);
if ( err ) {
(void) fprintf(stderr, "error on send: %s\n", mosquitto_strerror(err));
}
}
else {
(void) fprintf(stderr, "unknown command: '%s'\n", command);
}
}
}
int
main(void)
{
application_init();
struct mosquitto *client = mqtt_connect(
NULL,
USERNAME,
PASSWORD,
HOSTNAME,
PORT,
NULL);
if ( !client ) {
return EXIT_FAILURE;
}
application_run(client);
mqtt_shutdown(client);
return EXIT_SUCCESS;
}
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