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// Standard C
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
// System
#include <unistd.h>
// Project
#include <mosquitto.h>
#ifndef UNUSED
# define UNUSED(x) (void) (x)
#endif
#define CLIENT_ID "my-client-id"
#define HOST "192.168.77.2"
#define PORT 1883
#define USERNAME "zigbee2mqtt"
#define PASSWORD "xoorei2uk2booSudies4Numoek1uot"
#define TOPIC "zigbee2mqtt/Kontaktsensor"
#define KEEPALIVE 10
#define WAIT_UNTIL_RECONNECT 10
static volatile bool terminate = false; // NOLINT
static void
handler(int signal)
{
if ( signal == SIGINT ) {
terminate = true;
}
}
static void
cleanup(void)
{
mosquitto_lib_cleanup();
}
static void
init(void)
{
(void) signal(SIGINT, handler);
mosquitto_lib_init();
(void) atexit(cleanup);
}
static void
message_callback(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
{
UNUSED(obj);
UNUSED(mosq);
printf("message '%.*s' for topic '%s'\n",
message->payloadlen, (const char *) message->payload,
message->topic);
}
static struct mosquitto *
setup(void)
{
struct mosquitto *client = mosquitto_new(CLIENT_ID, true, NULL);
if ( client == NULL ) {
(void) fprintf(stderr, "error on new client...\n");
return NULL;
}
int err = mosquitto_username_pw_set(client, USERNAME, PASSWORD);
if ( err != MOSQ_ERR_SUCCESS ) {
(void) fprintf(stderr, "error: %s\n", mosquitto_strerror(err));
mosquitto_destroy(client);
return NULL;
}
mosquitto_message_callback_set(client, message_callback);
err = mosquitto_connect(client, HOST, PORT, KEEPALIVE);
if ( err != MOSQ_ERR_SUCCESS ) {
(void) fprintf(stderr, "error: %s\n", mosquitto_strerror(err));
mosquitto_destroy(client);
return NULL;
}
return client;
}
static void
run(struct mosquitto *client)
{
mosquitto_subscribe(client, NULL, TOPIC, 0);
while ( !terminate ) {
static const int defaultTimeout = -1; // 1000ms
int err = mosquitto_loop(client, defaultTimeout, 1);
if ( !terminate && err ) {
(void) fprintf(stderr, "connection error: %s\n", mosquitto_strerror(err));
sleep(WAIT_UNTIL_RECONNECT); // NOLINT
mosquitto_reconnect(client);
}
}
}
static void
shutdown(struct mosquitto *client)
{
mosquitto_disconnect(client);
mosquitto_destroy(client);
}
int
main(void)
{
init();
struct mosquitto *client = setup();
if ( client ) {
run(client);
shutdown(client);
}
return EXIT_SUCCESS;
}
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