Retrieve the state of the group. Will usually contact the oldest group member to get the state. When the method returns true, a SetStateEvent will have been added to the channel's queue, causing receive() to return the state in one of the next invocations. If false, no state will be retrieved by receive().
The address of the member from which the state is to be retrieved. If it is null, the coordinator is contacted.
Milliseconds to wait for the response (0 = wait indefinitely).
boolean True if the state was retrieved successfully, otherwise false.