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You're missing the message_info
node, which seems to make rosserial
rather unhappy.
The socket.launch
launch file in rosserial_server
starts this (here):
<launch>
<node pkg="rosserial_server" type="socket_node" name="rosserial_server" />
<node pkg="rosserial_python" type="message_info_service.py" name="rosserial_message_info" />
</launch>
I'd try to launch the launch file instead of rosrun
ning the single node and see whether things improve.