The socket.dropMembership() method is an inbuilt application programming interface of class Socket within dgram module which is used to make kernel leave a multicast group at the particular multicast address.
Syntax:
const socket.dropMembership(multicastAddress[, multicastInterface])
Parameters: This method takes the string representing of the multicast address and multicast interface as the parameter.
Return Value: This method does not return any value.
Example 1: In this example, we will see the use of socket.dropMembership() method
Filename: index.js
// Node.js program to demonstrate the // socket.dropMembership() method // Importing dgram module const dgram = require( 'dgram' );
// Creating and initializing client // and server socket let client = dgram.createSocket( "udp4" );
let server = dgram.createSocket( "udp4" );
// Catching the message event server.on( "message" , function (msg) {
// Displaying the client message
process.stdout.write( "UDP String: " + msg + "\n" );
// Exiting process
process.exit();
}) .bind(1234, () => {
// Joining a multicast group at
// multicast address
server.addMembership( '224.0.0.114' );
// leaving a multicast group at
// multicast address
server.dropMembership( '224.0.0.114' );
});
// Client sending message to server client.send( "Hello" , 0, 7, 1234, "localhost" );
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Output:
UDP String: Hello
Example 2: In this example, we will see the use of a socket.dropMembership() method
Filename: index.js
// Node.js program to demonstrate the // socket.dropMembership() method // Importing dgram module const dgram = require( 'dgram' );
// Creating and initializing client // and server socket let client = dgram.createSocket( "udp4" );
let server = dgram.createSocket( "udp4" );
// Catching the message event server.on( "message" , function (msg) {
// Displaying the client message
process.stdout.write( "UDP String: " + msg + "\n" );
// Exiting process
process.exit();
}); // Catching the listening event server.on( 'listening' , () => {
const address = server.address();
console.log(`server listening
${address.address}:${address.port}`);
}); // Binding server with port address server.bind(1234, () => { // Adding a multicast address for
// others to join
server.addMembership( '224.0.0.114' );
// leaving a multicast group at multicast
// address by using dropMembership() method
server.dropMembership( '224.0.0.114' );
}); // Client sending message to server client.send( "Hello" , 0, 7, 1234, "localhost" );
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Output:
server listening 0.0.0.0:1234 UDP String: Hello
Run the index.js file using the following command:
node index.js