convert double precision number to decimal using Double.dou​bleToLongB​its() java method ?

I'm sending double precision numbers with simulink (udp) to eclipse and I want to write a java code to unpack that . can I use Double.doubleToLongBits?

I receive packes in byte , so I should convert these byte somehow to be able to use this method . could anybody help me ?

I converted byte to long and then tried to apply this method but the result was totally wrong . I really need help !