Network Delivery Layer (NDL)

The Network Delivery Layer (NDL) of the PubSub Engine is responsible for transmitting and receiving all messages across the network.

You can request the NDL to send debugging and informational messages to a local subscriber by doing the following:

1. Attach a subscriber to the local engine and subscribe to the pubsub.debug.ndl topic.

2. Publish on any of the following topics to the local engine.

   Note: The published value can be any string.

   Topic	Description
   pubsub.debug.ndl.debugon	Request the NDL to start publishing debug messages on the following topics: To receive details about the local PubSub Engine: pubsub.debug.ndl.self.<debugitem> To receive details about the peer PubSub Engines: pubsub.debug.ndl.<computerIp>.<debugItem> Where <debugItem> can be one of the following: heartbeats multicast_ip_address multicast_port nic_ip_address nic_port new_messages resent_messages sent_UDP_packets transmit_bandwidth transmit_queue_size engine_too_slow out_of_order_messages reorder_buffer resent_requests state SendInit UDPpacket_maximumsize largeUDPpackets
   pubsub.debug.ndl.debugoff	Request the NDL to stop publishing debug messages.
   pubsub.debug.ndl.dumptime.<seconds>	Change the period of the debug message output to the time indicated.