public void init(
            ApplicationContext context,
            @Nullable TurmsConnection connection,
            String fromNodeId) {
        setApplicationContext(context);
        setConnection(connection);
        setFromNodeId(fromNodeId);
    }
Is null if the RPC request runs on the local node
turms-server-common/src/main/java/im/turms/server/common/infra/cluster/service/rpc/dto/RpcRequest.java