export class Map{
    _id?: string;
    message: String;
    deviceID : String;
    packet : {
        cmd : String;
        retain : Boolean;
        qos : Number;
        dup : Boolean;
        length : Number;
        topic : String;
       // payload : { "$binary" : "MTguNjAxMjE1LDczLjc3Nzc2Mg==", "$type" : "00" }
    };
    when : Date
}