Replicate mysql database from a system having dynamic IP address

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MySQL

replication

How do I replicate a mysql database from a system having dynamic ip address(master) to a system having static IP address(slave).

Here is the requirement -

Client runs an application in offline mode(system has internet connection but not all the time), all the data from the database needs to be synchronized to a remote mysql server having static IP(hosted in cloud).

Any help would be greatly appreciated.

What I have tried:

searched a lot. what i found is both master and slave needs to have static IPs, but the requirement is master is connected to internet in normal way i.e. master is having dynamic IP address.