Link Status Monitoring

The RT-TCP/IP stack allows for the monitoring of network device interfaces for link status via new fields in the RT-TCP/IP INI file.

NOTE: Monitoring network device interfaces is an optional feature. It is disabled by default.

The driver for the network device must support acknowledging generated interrupts on link status changes in order for stack monitoring to work.

Link Status Fields

New fields are listed under the [rtndX] sections in the RT-TCP/IP INI file:

Field	Default	Status
LinkStatus	0	Monitor the link status for a given interface 0 – driver does not support link status 1 – driver supports link status
LinkStatusPriority	1	Priority of the monitoring thread (0 to 127)
LinkStatusInterval	200	Interval at which the monitoring thread checks for the link status (1 to 1000 ms)

Field

Default

Status

LinkStatus

Monitor the link status for a given interface

0 – driver does not support link status

1 – driver supports link status

LinkStatusPriority

Priority of the monitoring thread (0 to 127)

LinkStatusInterval

200

Interval at which the monitoring thread checks for the link status (1 to 1000 ms)

Example

The example below shows an entry in the RT-TCP/IP INI file where link status monitoring is enabled (LinkStatus=1) for the RtE1000 driver:

[rtnd1]
Driver=RtE1000
IPAddr=192.163.4.8
Netmask=255.255.0.0
InterruptPriority=64
ReceivePriority=63
NumRecvBuffers=48
NumXmitBuffers=48
LatencyRecvUpdated=0
LineBasedOnly=0
LinkStatus=1
LinkStatusPriority=1
LinkStatusInterval=200