Send Data from Server to Device

I am going to send data from Sever to Device.
I can't find how to do it.

There's a "send command" button. There's also an API for it.

Thanks for your reply.
I am going to send the data into device not using the sms.
Would you tell me the api ?

it stores the commands and data into database and send it into device.
I want to know how to do this

Thanks

I found the api int the CommandResource.java

@POST
@Path("send")
public Response send(Command entity)

is this right?