一年経っておりますが後に続く誰かのために回答。
joinノードを使います、下記サンプルでは最後のメッセージから500ミリ秒(0.5秒)待ちます。
Node
1[{"id":"8ce72eee.06934","type":"join","z":"5262cfb.5d6fa3","name":"","mode":"custom","build":"array","property":"payload","propertyType":"msg","key":"topic","joiner":"\n","joinerType":"str","accumulate":false,"timeout":"0.5","count":"","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"num","reduceFixup":"","x":930,"y":180,"wires":[["1627e20d.28372e"]]},{"id":"1627e20d.28372e","type":"debug","z":"5262cfb.5d6fa3","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":1080,"y":180,"wires":[]},{"id":"b8ee96ab.d9d978","type":"inject","z":"5262cfb.5d6fa3","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":780,"y":180,"wires":[["8ce72eee.06934"]]}]
バッドをするには、ログインかつ
こちらの条件を満たす必要があります。
2018/06/15 04:21
2018/06/15 05:37