udp server in express app

I deployed a nodejs server on heroku but inside my nodejs app I open another port for udp connections , I don't know how to access this udp ,I tried to connected to ip and domain ,nothing worksalso I print address and port on listening in dgram, and prints listening on 0.0.0.0 ,I changed the binding to the domain name or ,process.env.HOST it says address not available ,like thisudp_server.bind(41234, process.env.HOST);

Submitted May 17, 2019 at 12:38AM by Hadyelzayady