Work to change port if app is newly started.

README.md

@@ -10,4 +10,8 @@ at least.
 Usage:
 ```bash
 rosrun axis_imu axis_imu _frame_id:=imu_frame _rate:=100 _root_passwd:=pass _camera_ip:=192.168.7.205 _driver_ip:=192.168.7.160 _port:=5000
-```
\ No newline at end of file
+```
+
+The port specification only works the first time.  To get it to work
+again go to the app section in the camera and stop and start the
+motionloggerudp app.