control message
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... traffic
flowing in the opposite direction. Its inclusion may
eliminate the need for a separate A/R control message
(see Section 5). A value of zero for this word is used
to indicate that no piggybacked A/R information is
...
... Flow Control Messages ...
... host by setting a bit in the Restart Complete control
message (see Section 8). Each datagram and stream message contains
...
... data
messages in the opposite direction over the link or may be sent in a
separate control message in the absence of reverse data traffic.
...
... Acceptance indications are returned in a similar manner, either
piggybacked on data messages or in a separate control message. An
acceptance is returned by the receiver to indicate that the
...
... measure, HAP permits aggregation of any mix of A/R indications into a
single A/R control message. Such a message might be used, for
example, to reject a group of messages where the refusal code on each
...
... critical feedback, even
when operating in discard mode, HAP defines an "Unnumbered Response"
control message. Flow control information, and other information
which cannot be sent as an A/R indication, is sent in an Unnumbered
...
... Flow control information, and other information
which cannot be sent as an A/R indication, is sent in an Unnumbered
Response control message. The format of this type of message is
illustrated in Figure 5.
...
... are piggybacked on data messages (word 2), and for aggregated A/R
information in A/R control messages. The format of A/R control
messages is shown in Figure 4.
...
... data messages (word 2), and for aggregated A/R
information in A/R control messages. The format of A/R control
messages is shown in Figure 4.
...
... 12 = Stream message too early
13 = Illegal control message type
14 = Illegal refusal code in A/R
15 = Can't implement loop
...
... of this message in words (N+1).
0[12-15] Control Message Type = 1 (Acceptance/Refusal).
1[0-15] Header Checksum ...
... 15 = Can't implement loop
0[12-15] Control Message Type = 5 (Unnumbered Response).
1[0-15] Header Checksum ...
... restart procedure initializes all internal WPS counts and
statistics for that link to zero. As data and control messages are
processed, counts are updated to reflect the total number of messages
sent, messages received correctly, and messages received with
...
... 0[4-11] Reserved. Must be zero.
0[12-15] Control Message Type = 0 (Status).
1[0-15] Header Checksum ...
... ON RC messages have been both sent and received. Local
counters have been zeroed. Data and control messages
can now be exchanged between the WPS and host.
...
...
The Restart Request control message (Figure 37) is sent by either a
host or a WPS when it wishes to restart ...
... 0[8-11] Reserved. Must be zero.
0[12-15] Control Message Type = 3 (Restart Request).
...
... 1 = Enable acceptance/refusal
0[12-15] Control Message Type = 4 (Restart Complete).
...
... The Host Access Protocol provides a Loopback Request control message
which can be used by a WPS or a host to request the remote loopback ...
... 3-15 = Undefined
0[12-15] Control Message Type = 8 (Loopback Request).
...
... Other Control Messages ...
... link, it
should send at least one Link Going Down control message (Figure 40)
over that link. HAP does not define the action(s) that should be
...
...
A No Operation (NOP) control message (Figure 41) may be sent at any
time by a WPS or a host. A NOP message contains up to 32 words of
...
... 11-15 = Undefined
0[12-15] Control Message Type = 7 (Link Going Down).
...
... 0[7-11] Length. The number of words of arbitrary data.
0[12-15] Control Message Type = 6 (NOP).
1[0-15] Header Checksum ...
... Restart Request and/or
Restart Complete control messages sent by the host to the WPS. If
the host ...
... In version 0, the Restart Request control message contained a "reason
for restart" field. That field was ignored in all current
...