When Tunneling, Instead of sending data on the network immediately after being read on the Serial Line, the data can be packed (queued) and sent in larger chunks.

A Tunnel can be configured to use Packing Mode in a number of ways:

Disabled: data never packed

Timeout: data sent after timeout occurs

Send Character: data sent when the Send Character is read on the Serial Line

The Threshold specifies if the amount of queued data reaches this limit, then send the data on the network immediately.

The Timeout specifies how long to wait before sending the queued data on the network.

If used, the Send Character is a special character that when read on the Serial Line forces the queued data to be sent out immediately.

The Trailing Character is a special character that is injected into the outgoing data stream right after the Send Character.