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关于ZIgBee通信的数据处理问题

 想要请教一个问题:

通过串口发送一条数据到协调器,协调器在转发给节点,如果这条数据很长,比如140字节,建议的数据发送方式是什么?如果需要拆包,那么是在协调器将数据拼接起来,然后转发给节点,还是协调器不拼接转发给节点,由节点自己拼接比较好?