diff --git a/pylibs/otns/cli/OTNS.py b/pylibs/otns/cli/OTNS.py
index 81c162d5..d82452d8 100644
--- a/pylibs/otns/cli/OTNS.py
+++ b/pylibs/otns/cli/OTNS.py
@@ -58,7 +58,8 @@ def _launch_otns(self) -> None:
         self._otns = subprocess.Popen([self._otns_path] + self._otns_args,
                                       bufsize=16384,
                                       stdin=subprocess.PIPE,
-                                      stdout=subprocess.PIPE)
+                                      stdout=subprocess.PIPE,
+                                      stderr=subprocess.PIPE)
         logging.info("otns process launched: %s", self._otns)
 
     def close(self) -> None:
@@ -166,6 +167,10 @@ def _do_command(self, cmd: str) -> List[str]:
 
             output.append(line)
 
+            line = self._otns.stderr.readline()
+            if line != b'':
+                logging.info(f"ABTIN {line}")
+
     def add(self, type: str, x: float = None, y: float = None, id=None, radio_range=None, executable=None,
             restore=False) -> int:
         """