Condition to send a message to, e.g. "'foo' in topics && 'bar' in topics".
Union field target. Required. Input only. Target to send a message to. target can be only one of token, topic or condition.
Registration token to send a message to.
Union field target. Required. Input only. Target to send a message to. target can be only one of token, topic or condition.
Topic name to send a message to, e.g. "weather". Note: "/topics/" prefix should not be provided.
Union field target. Required. Input only. Target to send a message to. target can be only one of token, topic or condition.