# Client-Server Communication API<\/p>\n
how to use for developer:
\n – Register packet in common code:
\n“`java
\npublic class FooBarPacket implements CscPacket{<\/p>\n
public FooBarPacket(ByteBuf buf) {
\n read(buf);
\n }<\/p>\n
private int foo;<\/p>\n
@Override
\n public void read(ByteBuf buf) {
\n foo = buf.readInt();
\n }<\/p>\n
@Override
\n public void write(ByteBuf buf) {
\n buf.writeInt(foo);
\n }
\n}
\n“`<\/p>\n
“`java – Use it on Server:<\/p>\n “`java public void init() { public void sendFooBarPacket(Player player) { “`java public void init() { public void sendFooBarPacket() { Communication API for Fabric client and Paper server<\/p>\n","protected":false},"featured_media":52028,"template":"","meta":{"_minecraft_slug":"csc-api","_minecraft_project_id":"q5pG7IFT","_minecraft_author":"Danyusha","_minecraft_license":"MIT","_minecraft_downloads":114,"_minecraft_follows":1,"_minecraft_client_side":"unsupported","_minecraft_server_side":"required","_minecraft_storage_type":"zip","_minecraft_archive_name":"csc-api.zip","_minecraft_size_bytes":49005,"_minecraft_version_count":4,"_minecraft_updated_at":"2026-05-15T19:19:51.096535Z","_minecraft_date_created":"2026-02-15T02:12:37.991549Z","_minecraft_date_modified":"2026-02-14T13:08:16.199836Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/csc-api","_minecraft_icon_attachment_id":52028,"_minecraft_imported_at":"2026-06-02T20:28:54+00:00","_minecraft_import_hash":"764c365f60769e4dad9e4fe537d33eed","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[97,127],"mod_loader":[132],"minecraft_version":[41,81],"class_list":["post-52027","mod","type-mod","status-publish","has-post-thumbnail","hentry","mod_category-fabric","mod_category-paper","mod_loader-paper","minecraft_version-1-21-11","minecraft_version-1-21-8"],"yoast_head":"\n
\npublic static CscPacketType
\n “foo_bar”,
\n FooBarPacket.class,
\n FooBarPacket::new
\n);
\n“`<\/p>\n
\npublic class ServerClass {
\n private static final Logger log = LoggerFactory.getLogger(ServerClass.class);<\/p>\n
\n CscServer.getService().registerListener((packet, player) -> {
\n log.info(“Received packet {} from player {}”, packet.getClass().getSimpleName(), player.getName());
\n }, ModPackets.FOO_BAR_PACKET);
\n }<\/p>\n
\n CscServer.getService().sendPacket(new FooBarPacket(), player);
\n }
\n}
\n“`
\n – Use it on Client:<\/p>\n
\npublic class ClientClass {
\n private static final Logger log = LoggerFactory.getLogger(ClientClass.class);<\/p>\n
\n CscClient.getService().registerListener(packet -> {
\n log.info(“Received packet: {}”, packet);
\n }, ModPackets.FOO_BAR_PACKET);
\n }<\/p>\n
\n CscClient.getService().sendPacket(new FooBarPacket());
\n }
\n}
\n“`<\/p>\n","protected":false},"excerpt":{"rendered":"