How can I be sure that the downlink is being send?

How can I be sure that the downlink is being send?

@Andrea Enriquez

Hi,

I have been trying to send downlink to my devices through the configuration parameters, but I want to know if there´s a way to be sure that it is getting to the device.
Also I have notice that when the lecture is done the parameter that I have enter never changes to READ, so I think it is not being read.

My devices are from Tektelic and also the server I´m using.