diff --git a/src/etcp.c b/src/etcp.c
index aa876ce..31393cb 100644
--- a/src/etcp.c
+++ b/src/etcp.c
@@ -637,6 +637,8 @@ static void input_send_q_cb(struct ll_queue* q, void* arg) {// etcp->input_send_
 static void send_ack_req_cb(struct ll_queue* q, void* arg) {// etcp->ack_q data ready
     DEBUG_TRACE(DEBUG_CATEGORY_ETCP, "");
     struct ETCP_CONN* etcp=(struct ETCP_CONN*)arg;
+    DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "[%s] processing", etcp->log_name);
+
     etcp_conn_process_send_queue(etcp);
     if (etcp->tx_state==ETCP_TX_STATE_DATA_WAIT) queue_resume_callback(etcp->ack_q);
     }
@@ -1139,6 +1141,8 @@ void etcp_conn_input(struct ETCP_DGRAM* pkt) {
                     p->seq=seq;
                     p->pkt_timestamp=pkt->timestamp;
                     p->recv_timestamp=get_current_timestamp();
+                    DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "[%s] RX add to ack_q seq=%d", etcp->log_name, seq);
+
                     queue_data_put_with_index(etcp->ack_q, (struct ll_entry*)p, 0, 4);
                     if (etcp->ack_resp_timer == NULL) {
                         etcp->ack_resp_timer = uasync_set_timeout(etcp->instance->ua, ACK_DELAY_TB, etcp, ack_response_timer_cb);