Arduino+sim900+mqtt

Dear friend, I found your tutorial for mqtt +sim900+arduino. I use sim900 in transparent mode and I want to send data to mqtt broker. How can I set topic with AT commands? Thanks

When you are using transparent mode, you need to send only the MQTT part of the fields mentioned in the tutorial. Just send the bytes in the Excel document i showed, it should work. But make sure they are sent in binary mode and not in ASCII mode.