sending IP address of machine to server

I need to send a simple request to one of my server on defined intervals, let's say one every 2 seconds, in order to tell my server my machine's IP address(since I've dynamic one). I'm currently doing it in a while loop with a delay for std::system call for curl command with --silent option and redirecting rest to /dev/null. Something like this -

curl -s 'http://example.com' > /dev/null

The server currently parses the request and finds out the required IP address from it. Is there any other way to do this?