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
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?
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