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fkie / multimaster_fkie

ROS stack with FKIE packages for multi-robot (discovering, synchronizing and management GUI)
BSD 3-Clause "New" or "Revised" License
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Connection refused in starting master_discovery_fkie #74

Closed coolkesword closed 6 years ago

coolkesword commented 6 years ago

Dear sir/madam,

Hi, I am currently using the multimaster_fkie to setup the intercommunication between several robots, and some problems occurred in launching the multimaster_fkie package.

The software environment is: Ubuntu 16.04 + ROS kinetic + multimaster_fkie kinetic-devel branch. The hardware setup is described as follows: we use a TPlink router to build up a wireless network, and each robot is equipped with a wireless interface card (DLink) and connected to the router.

We followed exactly the procedure as described in the section 3 of the document: http://www.iri.upc.edu/files/scidoc/1607-Multi-master-ROS-systems.pdf. Each robot can ping 244.0.0.1 successfully, but the package cannot be launched and the error message is shown below. Could you kindly advise on how to proceed? Is it related with our hardware setting or software configuration? We also tried parameter settings like interface, send_mcast and robot_hosts but they didn't help. Thanks a lot in advance!

rosrun master_discovery_fkie master_discovery _mcast_group:=224.0.0.1 Error while set the log level: [Errno 111] Connection refused ->INFO level will be used! Traceback (most recent call last): File "/home/fh/catkin_ws/src/multimaster_fkie/master_discovery_fkie/nodes/master_discovery", line 4, in master_discovery_fkie.main() File "", line 97, in main File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/client.py", line 326, in init_node _init_node_params(argv, name) File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/client.py", line 186, in _init_node_params set_param(rosgraph.names.PRIV_NAME + param_name, param_value) File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/client.py", line 514, in set_param _param_server[param_name] = param_value #MasterProxy does all the magic for us File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/msproxy.py", line 148, in setitem self.target.setParam(rospy.names.get_caller_id(), rospy.names.resolve_name(key), val) File "/usr/lib/python2.7/xmlrpclib.py", line 1243, in call return self.send(self.name, args) File "/usr/lib/python2.7/xmlrpclib.py", line 1602, in request verbose=self.verbose File "/usr/lib/python2.7/xmlrpclib.py", line 1283, in request return self.single_request(host, handler, request_body, verbose) File "/usr/lib/python2.7/xmlrpclib.py", line 1311, in single_request self.send_content(h, request_body) File "/usr/lib/python2.7/xmlrpclib.py", line 1459, in send_content connection.endheaders(request_body) File "/usr/lib/python2.7/httplib.py", line 1053, in endheaders self._send_output(message_body) File "/usr/lib/python2.7/httplib.py", line 897, in _send_output self.send(msg) File "/usr/lib/python2.7/httplib.py", line 859, in send self.connect() File "/usr/lib/python2.7/httplib.py", line 836, in connect self.timeout, self.source_address) File "/usr/lib/python2.7/socket.py", line 575, in create_connection raise err socket.error: [Errno 111] Connection refused

Thanks and regards Jie

atiderko commented 6 years ago

Hello Jie,

I get the same error if roscore is not running. If you try to start _masterdiscovery without passed arguments you will see the warning about not running ROS master. It seems to be an unhandled error in ROS.

coolkesword commented 6 years ago

Dear Mr. Atiderko,

Thanks for your reply. We had run roscore before launching multimaster fkie package, so roscore is not the cause for our problem. It's worthy to mention that things turned out to work successfully if we equip our robots with computers with integrated wireless interface cards. Hence the problem should be related with the standalone wireless interface cards.

Regards Jie