Protocol "D"

TCP/IP Protocol for controlling the dynamic routing engine

Fred Gleason

Overview

Messages to the DRouter dynamic routing service are by means of a TCP SOCK_STREAM connection to TCP port 23883 on the host server.

Messages have the following general syntax:

cmd-code [arg] [...]CR/LF

cmd-code: A single word, containing no whitespace, case-insensitive.
arg: Zero or more arguments, delimited by a TAB character (ASCII 9).
CR/LF: The ASCII character CR (13) followed by LF (10).

Connection Management

Messages for managing connections to the service.

Exit

Exit

Drop the TCP connection and end the session.

Ping

Ping

Causes the remote end to return a PONG message.

Alarms

Messages for receiving alarms and querying alarm states.

List Clips

ListClips

Return a list of records delineating the currently available CLIP alarms, including current state.

CLIP: The string CLIP
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the destination on the parent node (zero-based).
type: The type of signal. Valid types are INPUT or OUTOUT.
chan: The audio channel. Valid types are LEFT or RIGHT.
state: The alarm state. 1 means the alarm is active, whereas 0 means that it is inactive.

List Silences

ListSilences

Return a list of records delineating the currently available SILENCE alarms, including current state.

CLIP: The string SILENCE
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the destination on the parent node (zero-based).
type: The type of signal. Valid types are INPUT or OUTOUT.
chan: The audio channel. Valid types are LEFT or RIGHT.
state: The alarm state. 1 means the alarm is active, whereas 0 means that it is inactive.

Subscribe Clips

SubscribeClips

Return a list of CLIPADD records delinieating the currently active clip alarms, each record terminated by CR/LF (see the description of the CLIP message in the section called “List Clips” for a breakdown of the supplied fields). Whenever a new clip alarm is added, a corresponding CLIPADD record will be sent, while changes to an existing clip alarm will cause a CLIP record to be sent. Removal of an alarm from the system will generate a corresponding CLIPDEL record, containing the following fields:

CLIPDEL: The string CLIPDEL.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the destination on the parent node (zero-based).
type: The type of signal. Valid types are INPUT or OUTOUT.
chan: The audio channel. Valid types are LEFT or RIGHT.

Subscribe Silences

SubscribeSilences

Return a list of SILENCEADD records delinieating the currently active silence alarms, each record terminated by CR/LF (see the description of the SILENCE message in the section called “List Silences” for a breakdown of the supplied fields). Whenever a new silence alarm is added, a corresponding SILENCEADD record will be sent, while changes to an existing silence alarm will cause a SILENCE record to be sent. Removal of an alarm from the system will generate a corresponding SILENCEDEL record, containing the following fields:

SILENCEDEL: The string SILENCEDEL.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the destination on the parent node (zero-based).
type: The type of signal. Valid types are INPUT or OUTOUT.
chan: The audio channel. Valid types are LEFT or RIGHT.

Information

Messages for enumerating resources and getting system information.

List Destinations

ListDestinations

Return a list of records delinieating the currently available destinations, terminated by CR/LF. Each record contains the following fields, delimited by TAB (ASCII 9):

DST: The string DST.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the destination on the parent node (zero-based).
host-name: The host name of the parent node. Depending upon system configuration, this could be the name as programmed in the node or the name as reported via a DNS PTR lookup.
stream-addr: The IPv4 address of the stream configured to be received, in dotted-quad notation.
dest-name: The name of the destination.
channels: The number of channels capable of being received by this destination. Possible values include 1, 2 or 8.

List GPIs

ListGpis

Return a list of records delinieating the currently available GPIs, terminated by CR/LF. Each record contains the following fields, delimited by TAB (ASCII 9):

GPI: The string GPI.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the GPI on the parent node (zero-based).
host-name: The host name of the parent node. Depending upon system configuration, this could be the name as programmed in the node or the name as reported via a DNS PTR lookup.
code: A string representing the state of the GPI lines, in the format xxxxx.

List GPOs

ListGpos

Return a list of records delinieating the currently available GPOs, terminated by CR/LF. Each record contains the following fields, delimited by TAB (ASCII 9):

GPO: The string GPO.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the GPO on the parent node (zero-based).
host-name: The host name of the parent node. Depending upon system configuration, this could be the name as programmed in the node or the name as reported via a DNS PTR lookup.
code: A string representing the state of the GPO lines, in the format xxxxx.
name: The name of the GPO entry.
src-host-addr: The IPv4 address of the source GPI node, in dotted-quad notation.
src-slot: The slot position number of the source GPI on the source node (zero-based).

List Nodes

ListNodes

Return a list of records delinieating the currently available nodes, terminated by CR/LF. Each record contains the following fields, delimited by TAB (ASCII 9):

NODE: The string NODE.
host-addr: The IPv4 address of the node, in dotted-quad notation.
host-name: The host name of the node. Depending upon system configuration, this could be the name as programmed in the node or the name as reported via a DNS PTR lookup.
dev-name: The LWRP device name.
src-slots: The number of source slot positions.
dst-slots: The number of destination slot positions.
gpi-slots: The number of GPI slot positions.
gpo-slots: The number of GPO slot positions.

List Sources

ListSources

Return a list of SRC records, delinieating the currently available sources, terminated by CR/LF. Each record contains the following fields, delimited by TAB (ASCII 9):

SRC: The string SRC.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the source on the parent node (zero-based).
host-name: The host name of the parent node. Depending upon system configuration, this could be the name as programmed in the node or the name as reported via a DNS PTR lookup.
stream-addr: The IPv4 stream address in dotted-quad notation.
stream-name: The name of the stream.
stream-enabled: The current state of the stream. 1 if enabled or 0 if disabled.
channels: The number of channels being carried by the stream. Possible values include 1, 2 or 8.
block-size: The number of PCM24 frames carried by each RTP packet. Possible values include 12 (Live Stereo), 60 (8 Channel Surround) and 240 (Standard Stereo/Mono).

Subscribe Destinations

SubscribeDestinations

Return a list of DSTADD records delinieating the currently available destinations, each record terminated by CR/LF (see the description of the DST message in the ListDestinations command for a breakdown of the supplied fields). Whenever a new destination is added, a corresponding DSTADD record will be sent, while changes to an existing destination will cause a DST record to be sent. Removal of a destination from the system will generate a corresponding DSTDEL record, containing the following fields:

DSTDEL: The string DSTDEL.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the destination on the parent node (zero-based).

Subscribe GPIs

SubscribeGpis

Return a list of GPIADD records delinieating the currently available GPIs, each record terminated by CR/LF (see the description of the GPI message in the ListGpis command for a breakdown of the supplied fields). Whenever a new GPI is added, a corresponding GPIADD record will be sent, while changes to an existing GPI will cause a GPI record to be sent. Removal of a GPI from the system will generate a corresponding GPIDEL record, containing the following fields:

GPIDEL: The string GPIDEL.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the GPI on the parent node (zero-based).

Subscribe GPOs

SubscribeGpos

Return a list of GPOADD records delinieating the currently available GPOs, each record terminated by CR/LF (see the description of the GPO message in the ListGpos command for a breakdown of the supplied fields). Whenever a new GPO is added, a corresponding GPOADD record will be sent, while changes to an existing GPO will cause a GPO record to be sent. Removal of a GPO from the system will generate a corresponding GPODEL record, containing the following fields:

GPODEL: The string GPODEL.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the GPO on the parent node (zero-based).

Subscribe Nodes

SubscribeNodes

Return a list of NODEADD records delineating the currently available nodes, each record terminated by CR/LF. Subsequently, for each newly detected node, a corresponding NODEADD record will be sent, while changes to an existing node will cause a NODE record to be sent. Removal of a node from the system will generate a corresponding NODEDEL record with the following fields:

NODEDEL: The string NODEDEL.
host-addr: The IPv4 address of the node, in dotted-quad notation.

Subscribe Sources

SubscribeSources

Return a list of SRCADD records delinieating the currently available sources, each record terminated by CR/LF (see the description of the SRC message in the ListSources command for a breakdown of the supplied fields). Whenever a new source is added, a corresponding SRCADD record will be sent, while changes to an existing source will cause a SRC record to be sent. Removal of a source from the system will generate a corresponding SRCDEL record, containing the following fields:

SRCDEL: The string SRCDEL.
host-addr: The IPv4 address of the parent node, in dotted-quad notation.
slot: The slot position number of the source on the parent node (zero-based).

Commands

Messages for changing the state of managed resources.

Clear Audio Crosspoint

ClearCrosspoint dst-host-addr dst-slot

Clear the source to be received by an audio destination --i.e. mute the destination.

dst-host-addr: The IPv4 address of the destination node, in dotted-quad notation.
dst-slot: The slot position number of the destination on the parent node (zero-based).

Clear GPIO Crosspoint

ClearGpioCrosspoint gpo-host-addr gpo-slot

Clear the source to be received by a GPO.

gpo-host-addr: The IPv4 address of the GPO node, in dotted-quad notation.
gpo-slot: The slot position number of the GPO on the parent node (zero-based).

Set Audio Crosspoint

SetCrosspoint dst-host-addr dst-slot src-host-addr src-slot

Set the source to be received by an audio destination.

dst-host-addr: The IPv4 address of the destination node, in dotted-quad notation.
dst-slot: The slot position number of the destination on the parent node (zero-based).
src-host-addr: The IPv4 address of the source node, in dotted-quad notation.
src-slot: The slot position number of the source on the parent node (zero-based).

Set GPIO Crosspoint

SetGpioCrosspoint gpo-host-addr gpo-slot gpi-host-addr gpi-slot

Set the source to be received by a GPO.

gpo-host-addr: The IPv4 address of the GPO node, in dotted-quad notation.
gpo-slot: The slot position number of the GPO on the parent node (zero-based).
gpi-host-addr: The IPv4 address of the GPI node, in dotted-quad notation.
gpi-slot: The slot position number of the GPI on the parent node (zero-based).

Set GPO State

SetGpoState gpo-host-addr gpo-slot code

Set the state of a GPO device.

gpo-host-addr: The IPv4 address of the GPO node, in dotted-quad notation.
gpo-slot: The slot position number of the GPO on the parent node (zero-based).
code: A string representing the state of the GPO lines, in the format xxxxx.

Set Virtual GPI State

SetGpiState gpi-host-addr gpi-slot code

Set the state of a virtual GPI device.

gpi-host-addr: The IPv4 address of the virtual GPI node, in dotted-quad notation.
gpi-slot: The slot position number of the virtual GPI on the parent node (zero-based).
code: A string representing the state of the GPI lines, in the format xxxxx.