def METHOD_NAME(self):
    # If setup is not established no need to release
    if self._smf_assoc_state != UPFAssociationState.ESTABLISHED:
        return
    # Create Node association release message
    assoc_message = UPFAssociationState(
        state_version=self._smf_assoc_version + 1,
        assoc_state=UPFAssociationState.RELEASE,
    )
    self._send_association_request_message(assoc_message)
    self._smf_assoc_state = UPFAssociationState.RELEASE
    self._smf_assoc_version = 0