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2016-11-17 05:10:49 -0500	answered a question	Rosserial arduino connectivity problem " socket.error: [Errno 111] Connection refused" The problem was in the ROS_MASTER_URI , it was not activated. After activating it the problem solved. Thank you for your support.
2016-11-17 01:59:57 -0500	asked a question	ROS serial communication error "socket.error: [Errno 111] Connection refused" I am using Ubuntu 14.04LTS with Indigo ROS and an Arduino Mega 2560. When I run the command rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=115200, I faced some connection problems first this command was working normally and the serial connection was connected successfully with the Arduino. suddenly after restart my PC the following Error was appear "socket.error: [Errno 111] Connection refused" and serial connection didn't established. The following codes i write it by sequence : `> sudo usermod -a -G dialout wael > sudo chmod a+rw /dev/ttyACM0 > rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=115200` The following error appear Traceback (most recent call last): File "/opt/ros/indigo/lib/rosserial_python/serial_node.py", line 46, in <module> rospy.init_node("serial_node") File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/client.py", line 323, in init_node _init_node_params(argv, name) File "/opt/ros/indigo/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/indigo/lib/python2.7/dist-packages/rospy/client.py", line 504, in set_param _param_server[param_name] = param_value #MasterProxy does all the magic for us File "/opt/ros/indigo/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 1233, in __call__ return self.__send(self.__name, args) File "/usr/lib/python2.7/xmlrpclib.py", line 1587, in __request verbose=self.__verbose File "/usr/lib/python2.7/xmlrpclib.py", line 1273, in request return self.single_request(host, handler, request_body, verbose) File "/usr/lib/python2.7/xmlrpclib.py", line 1301, in single_request self.send_content(h, request_body) File "/usr/lib/python2.7/xmlrpclib.py", line 1448, in send_content connection.endheaders(request_body) File "/usr/lib/python2.7/httplib.py", line 975, in endheaders self._send_output(message_body) File "/usr/lib/python2.7/httplib.py", line 835, in _send_output self.send(msg) File "/usr/lib/python2.7/httplib.py", line 797, in send self.connect() File "/usr/lib/python2.7/httplib.py", line 778, in connect self.timeout, self.source_address) File "/usr/lib/python2.7/socket.py", line 571, in create_connection raise err socket.error: [Errno 111] Connection refused What can i do please to solve this problem?
2016-11-17 01:59:56 -0500	asked a question	Rosserial arduino connectivity problem " socket.error: [Errno 111] Connection refused" I am using Ubuntu 14.04LTS with Indigo ROS and an Arduino Mega 2560. When I run the command rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=115200, I faced some connection problems first this command was working normally and the serial connection was connected successfully with the Arduino. suddenly after restart my PC the following Error was appear "socket.error: [Errno 111] Connection refused" and serial connection didn't established. The following codes i write it by sequence : `> sudo usermod -a -G dialout wael > sudo chmod a+rw /dev/ttyACM0 > rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=115200` The following error appear Traceback (most recent call last): File "/opt/ros/indigo/lib/rosserial_python/serial_node.py", line 46, in <module> rospy.init_node("serial_node") File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/client.py", line 323, in init_node _init_node_params(argv, name) File "/opt/ros/indigo/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/indigo/lib/python2.7/dist-packages/rospy/client.py", line 504, in set_param _param_server[param_name] = param_value #MasterProxy does all the magic for us File "/opt/ros/indigo/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 1233, in __call__ return self.__send(self.__name, args) File "/usr/lib/python2.7/xmlrpclib.py", line 1587, in __request verbose=self.__verbose File "/usr/lib/python2.7/xmlrpclib.py", line 1273, in request return self.single_request(host, handler, request_body, verbose) File "/usr/lib/python2.7/xmlrpclib.py", line 1301, in single_request self.send_content(h, request_body) File "/usr/lib/python2.7/xmlrpclib.py", line 1448, in send_content connection.endheaders(request_body) File "/usr/lib/python2.7/httplib.py", line 975, in endheaders self._send_output(message_body) File "/usr/lib/python2.7/httplib.py", line 835, in _send_output self.send(msg) File "/usr/lib/python2.7/httplib.py", line 797, in send self.connect() File "/usr/lib/python2.7/httplib.py", line 778, in connect self.timeout, self.source_address) File "/usr/lib/python2.7/socket.py", line 571, in create_connection raise err socket.error: [Errno 111] Connection refused What can i do please to solve this problem?