Difference between revisions of "StartPingCheck"
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==Layout== | {{ProtocolNav|parent:Category:Common Messages}} | ||
<pre> | ==Message Layout== | ||
<pre width=80> | |||
{ | { | ||
StartPingCheck High NotTrusted Unencoded | StartPingCheck High 1 NotTrusted Unencoded | ||
{ | { | ||
PingID Single | PingID Single | ||
{ PingID U8 } | { PingID U8 } | ||
{ OldestUnacked U32 } | { OldestUnacked U32 } | ||
} | } | ||
} | } | ||
</pre> | </pre> | ||
==Usage== | ==Usage and Notes== | ||
*Used to measure circuit ping times | * Used to measure circuit ping times. | ||
*PingID is | * PingID is increased by 1 each time StartPingCheck is sent by the source. | ||
** After 255, PingID rolls over to 0. | |||
** The recipient is expected to respond with [[CompletePingCheck]] and return this PingID back to the source. | |||
* OldestUnacked is simply the sequence number (see [[Packet Layout]]) of the most recent message sent by the source (excluding this packet), regardless of whether that message was sent reliably. | |||
** It is stored as little-endian. | |||
For example, the following packet (hex data) is the 88th ping, with the last unacked message being sequence number 1364. | |||
<pre>00 00 00 05 55 00 01 58 54 05 00 00</pre> | |||
[[Category:Common Messages]] | |||
[[Category:Messages]] | |||
Latest revision as of 00:24, 19 September 2024
Message Layout
{
StartPingCheck High 1 NotTrusted Unencoded
{
PingID Single
{ PingID U8 }
{ OldestUnacked U32 }
}
}
Usage and Notes
- Used to measure circuit ping times.
- PingID is increased by 1 each time StartPingCheck is sent by the source.
- After 255, PingID rolls over to 0.
- The recipient is expected to respond with CompletePingCheck and return this PingID back to the source.
- OldestUnacked is simply the sequence number (see Packet Layout) of the most recent message sent by the source (excluding this packet), regardless of whether that message was sent reliably.
- It is stored as little-endian.
For example, the following packet (hex data) is the 88th ping, with the last unacked message being sequence number 1364.
00 00 00 05 55 00 01 58 54 05 00 00