A PassingRequest requests old and/or future passings or requests the stream of passings to stop.
It also allows to acknowledge received passings.
Sending a new get request will stop any other ongoing get request in the stream.
| Field | Type | Label | Description |
| get | CmdGetPassings |
request passings |
|
| stop | CmdStopPassings |
stop the current stream of passings |
|
| ack | CmdAckPassing |
acknowledge received passings |