delay in downlink and FOTA commands

We have a production system running a modified asset_tracker_v2. Things are basically running fine but there is question with downlink and FOTA operations. We publish a JSON packet to AWS basically every 15 minutes. This is working fine. The problem is that we have several parameters such as centigrade/Fahrenheit, temperature limits, duty cycle, etc. that are adjustable from the web by a customer on a customer portal. When a customer tries to send a downlink command to the board to change the parameter it is only seen at the board when we do a publish. This could take 15 minutes or whatever time the duty cycle is set to. A non technical customer sets a command to change a parameter and they do not see it for a very long time. The same with FOTA.

How can I set it up so that downlink and FOTA commands are seen quickly (seconds) not many minutes.

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