question: @ Override public synchronized void start ( ) { if ( running ) { return ; } LOGGER . info ( "Starting server" ) ; if ( endpoints . isEmpty ( ) ) { int port = config . getInt ( NetworkConfig . Keys . COAP_PORT ) ; LOGGER . log ( Level . INFO , "No endpoints have been defined for server, setting up server endpoint on default port {0}" , port ) ; addEndpoint ( new CoapEndpoint ( port , this . config ) ) ; } int started = 0 ; for ( Endpoint ep : endpoints ) { try { ep . start ( ) ; ++ started ; } catch ( IOException e ) { LOGGER . log ( Level . SEVERE , "Cannot start server endpoint [" + ep . getAddress ( ) + "]" , e ) ; } } if ( started == 0 ) { throw new IllegalStateException ( "None of the server endpoints could be started" ) ; } else { running = true ; } }
target:  Starts the server by starting all endpoints this server is assigned to. Each endpoint binds to its port. If no endpoint is assigned to the server, an endpoint is started on the port defined in the config.