diff --git a/flandre/launcher.py b/flandre/launcher.py
index 4bcc0ea..9494434 100644
--- a/flandre/launcher.py
+++ b/flandre/launcher.py
@@ -218,15 +218,21 @@ def device_upload(name, file: TextIOWrapper):
 
 
 @device.command('recvtest')
-def device_upload():
+def device_recv_test():
     ctx = zmq.Context()
     pull = ctx.socket(zmq.PULL)
     pull.connect(C.live_push_socket)
     last_ts = 0
+    first = True
     while True:
         b = pull.recv()
+
         ts, sequence_id, encoder, buffer = b2t(b)
-        print(ts, ts - last_ts)
+        if first:
+            last_ts = ts
+            first = False
+            continue
+        print((ts - last_ts)/10**6,flush=True)
         last_ts = ts