debug: add diagnostic logs for chat invite connect flow

- cs_find_conn_for_node: show queue state, entry found/missing, conn flags
- cs_on_conn_up: log when skipping due to !initialized
- etcp_conn_queue_set_ready: log reindex details (old/new entry, count)
- etcp_conn_set_peer_node_id: show state+reindexed flag

src/etcp.c

@@ -581,6 +581,8 @@ void etcp_conn_queue_set_ready(struct ETCP_CONN* conn) {
     if (!conn || conn->state != 0) return;
 
     // Reindex: remove old entry (key=0), add new entry with real peer_node_id
+    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "[%s] queue_set_ready: removing old entry=%p key=0 -> new key=0x%llx",
+                conn->log_name, (void*)conn->conn_queue_entry, (unsigned long long)conn->peer_node_id);
     if (conn->conn_queue && conn->conn_queue_entry) {
         queue_remove_data(conn->conn_queue, conn->conn_queue_entry);
         queue_entry_free(conn->conn_queue_entry);
@@ -595,6 +597,8 @@ void etcp_conn_queue_set_ready(struct ETCP_CONN* conn) {
     conn->conn_queue = conn->instance->connections;
     conn->state = 1;
     queue_data_put_with_index(conn->instance->connections, qe);
+    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "[%s] queue_set_ready: new entry=%p put in queue, count=%d",
+                conn->log_name, (void*)qe, queue_entry_count(conn->instance->connections));
 
     DEBUG_INFO(DEBUG_CATEGORY_ETCP, "[%s] moved to ready queue, state=%d peer_node_id=0x%llx",
                conn->log_name, conn->state, (unsigned long long)conn->peer_node_id);
@@ -634,7 +638,8 @@ void etcp_conn_set_peer_node_id(struct ETCP_CONN* conn, uint64_t peer_node_id) {
 
     conn->peer_node_id = peer_node_id;
     etcp_update_log_name(conn);
-    DEBUG_INFO(DEBUG_CATEGORY_ETCP, "[%s] peer_node_id set to 0x%llx", conn->log_name, (unsigned long long)peer_node_id);
+    DEBUG_INFO(DEBUG_CATEGORY_ETCP, "[%s] peer_node_id set to 0x%llx (state=%d reindexed=%d)",
+               conn->log_name, (unsigned long long)peer_node_id, conn->state, conn->state == 1);
 }
 
 

tools/chatgui/transport/chat_sync.c

@@ -434,9 +434,17 @@ static void cs_join_timeout_cb(void* arg) {
 /* ── helper: find active ETCP_CONN for node ── */
 
 static struct ETCP_CONN* cs_find_conn_for_node(struct UTUN_INSTANCE* inst, uint64_t node_id) {
-    if (!inst->connections) return NULL;
+    if (!inst->connections) { DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "%s: find_conn connections=NULL", CS_ID); return NULL; }
     struct ll_entry* e = queue_find_data_by_index(inst->connections, (const uint8_t*)&node_id);
-    if (e) { struct conn_queue_entry* ce = (struct conn_queue_entry*)e->data; if (ce->conn->initialized && ce->conn->links_up) return ce->conn; }
+    if (e) {
+        struct conn_queue_entry* ce = (struct conn_queue_entry*)e->data;
+        DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "%s: find_conn node=%016llx found=%p initialized=%d links_up=%d state=%d",
+                    CS_ID, (unsigned long long)node_id, (void*)ce->conn, ce->conn->initialized, ce->conn->links_up, ce->conn->state);
+        if (ce->conn->initialized && ce->conn->links_up) return ce->conn;
+        return NULL;
+    }
+    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "%s: find_conn node=%016llx NOT FOUND in queue (head=%p count=%d)",
+                CS_ID, (unsigned long long)node_id, (void*)inst->connections->head, queue_entry_count(inst->connections));
     return NULL;
 }
 
@@ -484,7 +492,7 @@ static void cs_on_conn_up(struct ETCP_CONN* conn, void* arg) {
     if (!conn || !g_cs) return;
     uint64_t peer = conn->peer_node_id;
     if (peer == 0 || peer == g_cs->inst->node_id) return;
-    if (!conn->initialized) return;
+    if (!conn->initialized) { DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG, "%s: conn_up SKIP — not initialized peer=%016llx", CS_ID, (unsigned long long)peer); return; }
 
     if (g_cs->pending_invite_ch_id != 0 && !g_cs->info_req_timer) {
         DEBUG_INFO(DEBUG_CATEGORY_CONNECTIVITY, "%s: conn_up invite path peer=%016llx ch=%llu",