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I tried [adb forward tcp:11311 tcp:11311] for connection with roscore in AVD. and [rostopic list] gave erros as below.

Traceback (most recent call last):
  File "/opt/ros_dia/ros/bin/rostopic", line 45, in <module>
    rostopic.rostopicmain()
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1706, in rostopicmain
    _rostopic_cmd_list(argv)
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1648, in _rostopic_cmd_list
    exitval = _rostopic_list(topic, verbose=options.verbose, subscribers_only=options.subscribers, publishers_only=options.publishers, group_by_host=options.hostname) or 0
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 873, in _rostopic_list
    state = master.getSystemState()
  File "/opt/ros_dia/ros_comm/tools/rosgraph/src/rosgraph/masterapi.py", line 467, in getSystemState
    return self._succeed(self.handle.getSystemState(self.caller_id))
  File "/usr/lib/python2.6/xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.6/xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1392, in _parse_response
    return u.close()
  File "/usr/lib/python2.6/xmlrpclib.py", line 838, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 0: 'Failed to invoke method getSystemState in class org.ros.internal.node.xmlrpc.MasterImpl: null'>
hughie@hughie-nest:/opt/android-sdk-linux_x86/platform-tools$ rostopic list
Traceback (most recent call last):
  File "/opt/ros_dia/ros/bin/rostopic", line 45, in <module>
    rostopic.rostopicmain()
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1706, in rostopicmain
    _rostopic_cmd_list(argv)
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1648, in _rostopic_cmd_list
    exitval = _rostopic_list(topic, verbose=options.verbose, subscribers_only=options.subscribers, publishers_only=options.publishers, group_by_host=options.hostname) or 0
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 873, in _rostopic_list
    state = master.getSystemState()
  File "/opt/ros_dia/ros_comm/tools/rosgraph/src/rosgraph/masterapi.py", line 467, in getSystemState
    return self._succeed(self.handle.getSystemState(self.caller_id))
  File "/usr/lib/python2.6/xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.6/xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1392, in _parse_response
    return u.close()
  File "/usr/lib/python2.6/xmlrpclib.py", line 838, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 0: 'Failed to invoke method getSystemState in class org.ros.internal.node.xmlrpc.MasterImpl: null'>

I tried [adb forward tcp:11311 tcp:11311] for connection with roscore in AVD. and [rostopic list] gave erros as below.

Traceback (most recent call last):
  File "/opt/ros_dia/ros/bin/rostopic", line 45, in <module>
    rostopic.rostopicmain()
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1706, in rostopicmain
    _rostopic_cmd_list(argv)
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1648, in _rostopic_cmd_list
    exitval = _rostopic_list(topic, verbose=options.verbose, subscribers_only=options.subscribers, publishers_only=options.publishers, group_by_host=options.hostname) or 0
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 873, in _rostopic_list
    state = master.getSystemState()
  File "/opt/ros_dia/ros_comm/tools/rosgraph/src/rosgraph/masterapi.py", line 467, in getSystemState
    return self._succeed(self.handle.getSystemState(self.caller_id))
  File "/usr/lib/python2.6/xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.6/xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1392, in _parse_response
    return u.close()
  File "/usr/lib/python2.6/xmlrpclib.py", line 838, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 0: 'Failed to invoke method getSystemState in class org.ros.internal.node.xmlrpc.MasterImpl: null'>
hughie@hughie-nest:/opt/android-sdk-linux_x86/platform-tools$ rostopic list
Traceback (most recent call last):
  File "/opt/ros_dia/ros/bin/rostopic", line 45, in <module>
    rostopic.rostopicmain()
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1706, in rostopicmain
    _rostopic_cmd_list(argv)
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 1648, in _rostopic_cmd_list
    exitval = _rostopic_list(topic, verbose=options.verbose, subscribers_only=options.subscribers, publishers_only=options.publishers, group_by_host=options.hostname) or 0
  File "/opt/ros_dia/ros_comm/tools/rostopic/src/rostopic.py", line 873, in _rostopic_list
    state = master.getSystemState()
  File "/opt/ros_dia/ros_comm/tools/rosgraph/src/rosgraph/masterapi.py", line 467, in getSystemState
    return self._succeed(self.handle.getSystemState(self.caller_id))
  File "/usr/lib/python2.6/xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.6/xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1392, in _parse_response
    return u.close()
  File "/usr/lib/python2.6/xmlrpclib.py", line 838, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 0: 'Failed to invoke method getSystemState in class org.ros.internal.node.xmlrpc.MasterImpl: null'>

Jun 28, 2011 10:21:07 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused
Jun 28, 2011 10:21:07 PM org.apache.commons.httpclient.HttpMethodDirector executeWithRetry
INFO: Retrying request