code: def wait_for_stateful_block_init(context, mri, timeout=DEFAULT_TIMEOUT):
      
      context.when_matches(
          [mri, "state", "value"], StatefulStates.READY,
          bad_values=[StatefulStates.FAULT, StatefulStates.DISABLED],
          timeout=timeout)
docs: Wait until a Block backed by a StatefulController has initialized
  
      Args:
          context (Context): The context to use to make the child block
          mri (str): The mri of the child block
          timeout (float): The maximum time to wait