Hi,
Recently, I am implementing a SUBSCRIBE server to handing subscribe request with PJSIP, the program flow as following:
pjsip_dlg_create_uas(pjsip_ua_instance(), rdata, &contact_uri, &dlg);
/* Create server subscription and register user callback functions */
pjsip_evsub_create_uas(dlg, &evsub_user, rdata, 0, &sub);
/* Add content-type header */
pj_list_init(&hdr_list);
/* This function would send back 200 OK */
pjsip_evsub_accept(sub, rdata, st_code, &hdr_list);
the user call back of evsub_user as following:
static pjsip_evsub_user evsub_user =
{
on_evsub_state,
on_tsx_state,
&on_rx_refresh,
NULL,
NULL,
&on_server_timeout,
};
But the callback on_rx_refresh and on_server_timeout are never called.
I dive into the source code of pjsip and found the code as following:
pjsip/src/pjsip-simple/evsub.c
/*
* Transaction event processing by UAS, after subscription is accepted.
*/
static void on_tsx_state_uas( pjsip_evsub *sub, pjsip_transaction *tsx,
pjsip_event *event)
{
if (pjsip_method_cmp(&tsx->method, &sub->method) == 0 ||
pjsip_method_cmp(&tsx->method, &pjsip_subscribe_method) == 0)
{
... ...
/* Only wants to handle the first event when the request is
* received.
*/
if (tsx->state != PJSIP_TSX_STATE_TRYING)
return;
on_rx_refresh and on_server_timeout are called here.
}
}
From the code above the call back it only be called when the transaction in PJSIP_TSX_STATE_TRYING state.
but the transaction would be switched into PJSIP_TSX_STATE_COMPLETE state, when I call pjsip_evsub_accept(sub, rdata, st_code, &hdr_list);
and from the PJSIP develop guide http://www.pjsip.org/release/0.5.4/PJSIP-Dev-Guide.pdf (page 97)
on_evsub_state() would be called for state changed into ACCPETED when send out 200OK, but actually it is not called in my program.
I am not sure what I am missing.
Chenhui Xu
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