private void initProtocols() throws StartupException {
    if (config.isEnableMQTTService()) {
      registerManager.register(MQTTService.getInstance());
    }
    if (IoTDBRestServiceDescriptor.getInstance().getConfig().isEnableRestService()) {
      registerManager.register(RestService.getInstance());
    }
    if (PipeConfig.getInstance().getPipeAirGapReceiverEnabled()) {
      registerManager.register(PipeDataNodeAgent.receiver().airGap());
    }
  }
Generate a list for triggers that do not have jar on this node.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/service/DataNode.java