I'm not saying you're wrong but you need to check if the MQTT packets are sent 'as is' over a mobile connection or if they are inserted into whatever packet format the mobile connection uses. If the former then no problem, if the latter the you have additional overhead bytes from MQTT. The MQTT packets have to survive in tact to the MQTT broker, not get stripped off by some part of the connection you are using, so I suspect, but do not know for sure, that the latter scenario is the one you need to consider.
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