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I added the IP and name of the master (ubuntu14) in /etc/hosts file on the node machine (ubuntu16) and vice versa. When I restarted both machines and ran the node again from startup, I can receive the messages on the master.

A side note: If someone (like me) is trying to do a similar task with run multiple nodes, make sure to add the IPs and names of all the nodes in /etc/hosts of the master AND that all the nodes have distinct names since it is not possible for the master to resolve between nodes having same names.