debug: add final offset/to_add/data_len log before encrypt_send

INIT_REQ/INIT_RESP now log offset, s, to_add, data_len, noencrypt_len
right before etcp_encrypt_send to trace why enc_buf exceeds mtu.

src/etcp_connections.c

@@ -162,6 +162,8 @@ static void etcp_link_send_init(struct ETCP_LINK* link, uint8_t reset) {
 
 
     dgram->data_len = offset;
+    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_REQ final: offset=%zu s=%d to_add=%d data_len=%d noenc=%d",
+                offset, s, to_add, (int)dgram->data_len, (int)dgram->noencrypt_len);
     
     DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "Sending INIT request to link, node_id=%016llx, retry=%d", (unsigned long long)node_id, link->init_retry_count);
     
@@ -1546,6 +1548,8 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
     for (int i=0; i<to_add; i++) pkt->data[xoffset++]=rand();// fill pad
     // padding end
     pkt->data_len=xoffset;
+    DEBUG_ERROR(DEBUG_CATEGORY_CONNECTION, "INIT_RESP final: xoffset=%d s=%d to_add=%d data_len=%d noenc=%d",
+                xoffset, s, to_add, (int)pkt->data_len, (int)pkt->noencrypt_len);
 
     DEBUG_DEBUG(DEBUG_CATEGORY_CONNECTION, "Sending INIT RESPONSE, link=%p, local_link_id=%d, remote_link_id=%d", link, link->local_link_id, link->remote_link_id);
     DEBUG_INFO(DEBUG_CATEGORY_ETCP, "[ETCP DEBUG] Send INIT RESPONSE");