thanks for the recommendations. Yes, those are the topics. You have to consider that when using devices/25/# you will also get messages that do not belong to my readings, since I only want to read from 101 to 109, but through that channel there are many more, but actually the filtering part is quite clear. The information I am getting are temperatures. I will attach an image to make it clearer. Also I will check the references you share with me 
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