Fetch new roi statistics from the server, return them listed by roi index.

Returns:¶

A list, by roi index, of stats for every roi and for each frame available from the server at the time of calling. Each element of the list is a tuple (frame_indices, stats), where: - frame_indices is a ndarray of frame indices for each stats - stats is a structured ndarray of stats (min, max, avg, std, sum)