res/res_pjsip_pubsub: Add additional debug statements

When something very sad and wrong occurs, it's challenging sometimes to
figure out why. This patch adds some additional debug statements on
off-nominal paths to try and make debugging easier.

Change-Id: I7bffb73cc733b6f80193a23340881db4a102b640

res/res_pjsip_pubsub.c

@@ -2965,11 +2965,14 @@ static struct ast_sip_publication *publish_request_initial(struct ast_sip_endpoi
 
 	resource = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "inbound-publication", resource_name);
 	if (!resource) {
+		ast_debug(1, "No 'inbound-publication' defined for resource '%s'\n", resource_name);
 		pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 404, NULL, NULL, NULL);
 		return NULL;
 	}
 
 	if (!ast_strlen_zero(resource->endpoint) && strcmp(resource->endpoint, ast_sorcery_object_get_id(endpoint))) {
+		ast_debug(1, "Resource %s has a defined endpoint '%s', but does not match endpoint '%s' that received the request\n",
+			resource_name, resource->endpoint, ast_sorcery_object_get_id(endpoint));
 		pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 403, NULL, NULL, NULL);
 		return NULL;
 	}
@@ -2981,6 +2984,7 @@ static struct ast_sip_publication *publish_request_initial(struct ast_sip_endpoi
 	}
 
 	if (!event_configuration_name) {
+		ast_debug(1, "Event '%s' is not configured for '%s'\n", handler->event_name, resource_name);
 		pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 404, NULL, NULL, NULL);
 		return NULL;
 	}