XMPP auto reconnect using libstrophe - c

Question

using libstrophe, can I reconnect automatically when I loose connection.
I used the following code on the client side:
void conn_handler(xmpp_conn_t * const conn, const xmpp_conn_event_t status,
const int error, xmpp_stream_error_t * const stream_error,
void * const userdata)
{
if (status == XMPP_CONN_CONNECT) {
fprintf(stderr, "DEBUG: connected\n");
}
else {
fprintf(stderr, "DEBUG: disconnected\n");
}
}
void main()
{
xmpp_log_t *log;
char *jid;
jid = strdup("test#domain.com")
xmpp_initialize();
log = xmpp_get_default_logger(XMPP_LEVEL_ERROR);
cwmp->xmpp_ctx = xmpp_ctx_new(NULL, log);
cwmp->xmpp_conn = xmpp_conn_new(cwmp->xmpp_ctx);
xmpp_conn_set_jid(cwmp->xmpp_conn, jid);
xmpp_conn_set_pass(cwmp->xmpp_conn, cwmp->xmpp_param.password);
xmpp_connect_client(cwmp->xmpp_conn, NULL, 0, conn_handler, cwmp->xmpp_ctx);
xmpp_run(cwmp->xmpp_ctx);
}
when the client is connected for the first time, i get the message "DEBUG: connected"
When the server goes done, i get the message "DEBUG: disconnected". but when the server is up for the second time, the client is not reconnected automatically.

Answer 1

Libstrophe doesn't reconnect automatically. Starting from libstrophe-0.9.0 xmpp_conn_t object can be reconnected without loosing login information and user handlers:
#include <stdio.h>
#include <strophe.h>
void conn_handler(xmpp_conn_t * const conn, const xmpp_conn_event_t status,
const int error, xmpp_stream_error_t * const stream_error,
void * const userdata)
{
if (status == XMPP_CONN_CONNECT) {
fprintf(stderr, "DEBUG: connected\n");
} else {
fprintf(stderr, "DEBUG: disconnected, reconnecting...\n");
xmpp_connect_client(conn, NULL, 0, conn_handler, userdata);
}
}
int main()
{
xmpp_log_t *log;
xmpp_ctx_t *ctx;
xmpp_conn_t *conn;
const char *jid = "test#domain.com";
const char *pass = "password";
xmpp_initialize();
log = xmpp_get_default_logger(XMPP_LEVEL_ERROR);
ctx = xmpp_ctx_new(NULL, log);
conn = xmpp_conn_new(ctx);
xmpp_conn_set_jid(conn, jid);
xmpp_conn_set_pass(conn, pass);
xmpp_connect_client(conn, NULL, 0, conn_handler, NULL);
xmpp_run(ctx);
xmpp_conn_release(conn);
xmpp_ctx_free(ctx);
xmpp_shutdown();
return 0;
}
In versions before 0.9.0 user can't reuse xmpp_conn_t object after disconnection and needs to create new one. Example for libstrophe-0.8.8 and older:
#include <stdio.h>
#include <strophe.h>
#define TIMEOUT 1000
void conn_handler(xmpp_conn_t * const conn, const xmpp_conn_event_t status,
const int error, xmpp_stream_error_t * const stream_error,
void * const userdata)
{
int *reconnect = userdata;
if (status == XMPP_CONN_CONNECT) {
fprintf(stderr, "DEBUG: connected\n");
} else {
fprintf(stderr, "DEBUG: disconnected, reconnecting...\n");
*reconnect = 1;
}
}
int main()
{
xmpp_log_t *log;
xmpp_ctx_t *ctx;
xmpp_conn_t *conn;
const char *jid = "test#domain.com";
const char *pass = "password";
int reconnect;
xmpp_initialize();
log = xmpp_get_default_logger(XMPP_LEVEL_ERROR);
ctx = xmpp_ctx_new(NULL, log);
while (1) {
conn = xmpp_conn_new(ctx);
xmpp_conn_set_jid(conn, jid);
xmpp_conn_set_pass(conn, pass);
xmpp_connect_client(conn, NULL, 0, conn_handler, &reconnect);
reconnect = 0;
while (!reconnect)
xmpp_run_once(ctx, TIMEOUT);
xmpp_conn_release(conn);
}
xmpp_ctx_free(ctx);
xmpp_shutdown();
return 0;
}