I want to know , How server send message to client ?

[kasi]

I  don't  know  , how server send message to client .In  my  project  , Only  provision  

[Bjørn Kvaale]

I don't fully understand what you are asking. Could you please be a bit more specific what you are asking about?

[kasi]

hi , 

        I want  to  know , How  server  acknowledge the client ? . for example , Client   send  data  to  server  based on that  it

switch on the  corresponding led.  How  server  send  acknowledge  the  client ?  

[Bjørn Kvaale]

Does this link explain things?