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The real answer is there in the connection header:

http://wiki.ros.org/rospy/Overview/Publishers%20and%20Subscribers see the last few lines.

A subscriber can get access to a "connection header", which includes debugging information such as who sent the message, as well information like whether or not a message was latched. This data is stored as the _connection_header field of a received message.

e.g.

print m._connection_header
{'callerid': '/talker_38321_1284999593611',
 'latching': '0',
 'md5sum': '992ce8a1687cec8c8bd883ec73ca41d1',
 'message_definition': 'string data\n\n',
 'topic': '/chatter',
 'type': 'std_msgs/String'}

The real answer is there in the connection header:

http://wiki.ros.org/rospy/Overview/Publishers%20and%20Subscribers see the last few lines.

A subscriber can get access to a "connection header", which includes debugging information such as who sent the message, as well information like whether or not a message was latched. This data is stored as the _connection_header field of a received message.

e.g.

print m._connection_header
{'callerid': '/talker_38321_1284999593611',
 'latching': '0',
 'md5sum': '992ce8a1687cec8c8bd883ec73ca41d1',
 'message_definition': 'string data\n\n',
 'topic': '/chatter',
 'type': 'std_msgs/String'}