Alert Standard Format (ASF) Specification

Alert Standard Format (ASF) Specification v2.0 DMTF Document DSP0136
DSP0136 23 April 2003 Page 71 of 94
5.1.4.1 Start Watchdog Timer
This message starts the watchdog timer in the alert-sending device, sets the timer’s expiration
time, and contains the information needed for the alert-sending device to form the PET frame if
the timer expires. An alert-sending device performs the following steps when it receives a Start
Watchdog Timer message:
1. Stop the watchdog timer, if it is currently running. The new PET frame information will
overwrite the information associated with the previous Start Watchdog Timer message.
2. Save the PET frame information from the current message.
3. Set the timeout value to the number of seconds specified by the Timeout value in the
message.
4. Start the watchdog timer.
If the timer expires, the alert-sending device builds and then sends a PET frame using the event
information supplied on the most recently received Start Watchdog Timer message; that frame’s
transmission must follow the retransmission rules outlined in 3.1.1.1.
The Timeout Value is a two-byte field that specified the number of seconds that the alert-sending
device waits before transmitting the associated PET frame. A Start Watchdog Timer message
sender expects to send a Stop Watchdog Timer message within that amount of time, thus
canceling the PET frame transmission. The message sender indicates a Timeout Value of 5
minutes (300, or 012Ch, seconds) by setting the Timeout Value Low field to 2Ch (0010 1100b)
and the Timeout Value High field to 01h (0000 0001b).
1 7 1 1 8 1 8 1
S Slave Address Wr A Command A Byte Count A
• • •
Alert-sending Device Address 0 0 Management Control
0000 0010
0 0000 1101 to
0001 0010
15
0
8 1 8 1 8 1 8 1 8 1
Data1 A Data2 A Data3 A Data4 A Data5 A
• • •
Sub Command
Start Watchdog
Timer
0001 0011
0 Version
Number
0001 0000
0 Timeout Value
Low
0 Timeout Value
High
0 Event
Sensor
Type
0
8 1 8 1 8 1 8 1 8 1 8 1
Data6 A Data7 A Data8 A Data9 A Data10 A Data11 A
• • •
Event
Type
0 Event
Offset
0 Event Source
Type
0 Event
Severity
0 Sensor
Device
0 Sensor
number
0
8 1 8 1 8 1 1
Data12 A Data13 A
• • •
PEC
A P
Entity 0 Entity Instance 0 From zero (0) to five (5) bytes of Event Data [data dependent] 0
5.1.4.2 Stop Watchdog Timer
This message stops the watchdog timer contained within the alert-sending device. If the
managed client’s firmware supports a system boot-failure watchdog timer (see 4.1.2.1 ASF_INFO
on page 50), the firmware issues the Stop Watchdog Timer command to stop the timer that is
automatically started by the alert-sending device at power-on reset.
15
Byte Count ranges from 13 to 18, depending on the number of Event Data bytes included (0 to
5).