ESPnow是一种短距离无线通讯方式，可以一对一或者一对多，多对多通讯
一对一时需要获取对方的MAC地址作为信息接收地址，将发送地址修改为
通配符FF:FF:FF:FF:FF:FF可向所有设备发送消息，使用两块开发板，一块先
获取自身MAC地址并上传ESPnow接收程序，另一块开发板分别上传指定MAC
地址与通配符MAC地址，对比其中差异思考如何使用通配符向多个设备发送消息，同时接收端进行区分消息来源提示发送与接收消息时都包含己方与接收方的MAC地址，通过MAC地址
判断消息来源与接收者Serial9600SerialprintlnMAC11000将MAC地址修改为FF:FF:FF:FF:FF:FF可群发消息给所有设备FF:FF:FF:FF:FF:FFrandom Mixly1100SerialprintlnSent with successSerialprintlnError sending the data指定MAC地址可以发送消息给指定设备30:AE:A4:58:9D:7Crandom Mixly1100SerialprintlnSent with successSerialprintlnError sending the dataSerialprintlnmyData{"PartitionScheme":"default","UploadSpeed":"1500000"}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