server: enable tcp keepalive for cluster

server/src/scrypted-cluster-main.ts

@@ -244,6 +244,7 @@ export function startClusterClient(mainFilename: string, options?: {
                 port,
                 // require ipv4 to normalize cluster address.
                 family: 4,
+                keepAlive: true,
             });
 
             try {
@@ -349,6 +350,8 @@ export function createClusterServer(mainFilename: string, scryptedRuntime: Scryp
             console.log('Cluster client disconnected.', socket.remoteAddress, socket.remotePort);
         });
 
+        socket.setKeepAlive(true);
+
         const peer = preparePeer(socket, 'server');
 
         const connectForkWorker: ConnectForkWorker = async (auth: ClusterObject, properties: ClusterWorkerProperties) => {