Add config for server.keepAliveTimeout

lib/config.ts

@@ -48,6 +48,7 @@ const options = {
   CWMP_SSL_KEY: { type: "string", default: "" },
   CWMP_LOG_FILE: { type: "path", default: "" },
   CWMP_ACCESS_LOG_FILE: { type: "path", default: "" },
+  CWMP_KEEP_ALIVE_TIMEOUT: { type: "int", default: 0 },
 
   NBI_WORKER_PROCESSES: { type: "int", default: 0 },
   NBI_PORT: { type: "int", default: 7557 },

lib/server.ts

@@ -55,7 +55,8 @@ export function start(
   networkInterface,
   ssl,
   _listener,
-  onConnection?
+  onConnection?,
+  keepAliveTimeout: number = 0
 ): void {
   listener = _listener;
 
@@ -76,6 +77,7 @@ export function start(
     if (onConnection != null) server.on("connection", onConnection);
   }
 
+  if (keepAliveTimeout) server.keepAliveTimeout = keepAliveTimeout;
   server.listen(port, networkInterface);
 }