DIRECTORY
Atom USING [ DottedPair, DottedPairNode ],
IO,
Commander USING [ CommandProc, Register ],
Lark USING [ bStar, bThorp, ConnectionSpec, ConnectionSpecRec, CommandEvent, CommandEvents, CommandEventSequence, Device, disabled, EchoParameters, EchoParameterRecord, enabled, endNum, Event, KeyTable, Milliseconds, o3i1, o2i2, o1i1, Passel, SHHH, StatusEvent, Tone, ToneSpec, ToneSpecRec, VoiceBuffer ],
LarkOps USING [ LarkParameters, LarkParametersRec ],
LarkPlay USING [ ToneList, ToneSpec, ToneSpecRec ],
LarkRemoteControl USING [ BootLark ],
LarkOpsRpcControl,
LarkSmarts,
MBQueue USING [ QueueClientAction ],
Multicast USING [ HandleMulticast, StopHandlingMulticast ],
Nice,
Process USING [ Detach, EnableAborts, MsecToTicks, SetTimeout ],
Pup USING [ nullSocket ],
Rope USING [ Concat, Fetch, Length, ROPE ],
RPC USING [ CallFailed, SetMaxTransmissions ], 
ThNet USING [ pd ],
ThParty USING [ PartyInfo ],
ThPartyPrivate USING [ SmartsData ],
Thrush USING[ NetAddress, ROPE, SHHH, SmartsID ],
ThSmartsPrivate USING [
ConvDesc, Deregister, FlashDone, LarkCall, LarkInfo, LarkState, LSwitches, LState, ProgressTones, SmartsInfo, SwitchState ],
TU USING [ RefAddr ],
VoiceUtils USING [ ProblemFR, Report, ReportFR ]
;

LarkOutImpl: CEDAR MONITOR LOCKS info USING info: LarkInfo
IMPORTS
Commander, IO, LarkOpsRpcControl, LarkRemoteControl, MBQueue, Multicast, Nice, Process, Rope, RPC, ThNet, ThSmartsPrivate, TU, VoiceUtils
EXPORTS ThSmartsPrivate= {
OPEN IO;


ConvDesc: TYPE = ThSmartsPrivate.ConvDesc;
LarkInfo: TYPE = ThSmartsPrivate.LarkInfo;
LarkState: TYPE = ThSmartsPrivate.LarkState;
SmartsData: TYPE = ThPartyPrivate.SmartsData;
SmartsInfo: TYPE = ThSmartsPrivate.SmartsInfo;
SmartsID: TYPE = Thrush.SmartsID;
ROPE: TYPE = Thrush.ROPE;
firstTone: LarkState = FIRST[ThSmartsPrivate.ProgressTones];
bStar: Lark.Event = Lark.bStar;
bThorp: Lark.Event = Lark.bThorp;
enabled: Lark.Event = Lark.enabled;
endNum: Lark.Event = Lark.endNum;
disabled: Lark.Event = Lark.disabled;

TimeoutPolicy: TYPE = { never, always, unlessDebugging};

PD: TYPE = RECORD [
waitForTelco: CARDINAL _ 500, -- default values for initial pause, on time, and off time
telcoMinOn: CARDINAL _ 60, -- when generating touch-tones.
telcoMinOff: CARDINAL _ 60,
flashWaitTime: CARDINAL _ 1200,
idleWaitTime: CARDINAL _ 20000, -- time for supervisor to wait for more events.
keySynchTime: CARDINAL _ 3000, -- time for keys to be distributed, else give up
blinkWaitTime: CARDINAL _ 500, -- if LED is blinking, don't wait so long.
backDoorOH: BOOL_FALSE,
toLarkTimeoutOK: TimeoutPolicy _ unlessDebugging,
informLarkOK: TimeoutPolicy _ unlessDebugging,
toLarkTimeoutTransmissions: CARDINAL _ 4, -- How long to give a lark to respond
fromLarkTimeoutOK: TimeoutPolicy _ unlessDebugging,
fromLarkTimeoutTransmissions: CARDINAL _ 5, -- how long to give the server.
larkEventTimer: CARDINAL _ 6000,
larkTimeoutEvents: TimeoutPolicy _ unlessDebugging,
tonesInvalid: BOOL_TRUE,
noisyFeeps: BOOL_FALSE -- TRUE if caller is to hear automatically-generated touchtones.
];
pd: REF PD _ NEW[PD_[]];

dialTone: LarkPlay.ToneSpec _ NIL;
busyTone: LarkPlay.ToneSpec _ NIL;
errorTone: LarkPlay.ToneSpec _ NIL;
ringbackTone: LarkPlay.ToneSpec _ NIL;
quenchSpec: Lark.ToneSpec _ NEW[Lark.ToneSpecRec _[volume: 0, totalTime: 0, tones: LIST[[0,0,0,0]]]];
 

EnterLarkState: PUBLIC ENTRY PROC[
info: LarkInfo, newState: LarkState, data: LIST OF REF ANY_NIL ] = {
ENABLE UNWIND=>NULL;
EnterLarkSt[info, newState, data];
};

EnterLarkSt: PUBLIC INTERNAL PROC[
info: LarkInfo, newState: LarkState, data: LIST OF REF ANY ] = {
trans: LSTrans _ lsTrans[info.larkState][newState];
oldState: LarkState = info.larkState;
sw: BOOL_FALSE;
otherAction: REF_NIL;

connectionSpec: ThParty.PartyInfo;
toneSpec: LarkPlay.ToneSpec;
ropeSpec: Rope.ROPE;
keyTable: Lark.KeyTable;
feepSpecs: REF AFeepType_NIL;
keyTablesToDate: INT;
larkCall: ThSmartsPrivate.LarkCall _ NIL; -- See ThSmartsPrivate.LarkCall
IF info.failed THEN { FailInt[info, "Additional requests disregarded", FALSE]; RETURN; };
IF pd.tonesInvalid THEN SetTones[];
FOR dL: LIST OF REF ANY_data, dL.rest WHILE dL#NIL DO
WITH dL.first SELECT FROM
cS: ThParty.PartyInfo => connectionSpec _  cS;
tS: LarkPlay.ToneSpec => toneSpec _ tS;
kT: Lark.KeyTable => keyTable _ kT;
lC: ThSmartsPrivate.LarkCall => larkCall _ lC; -- see ThSmartsPrivate.LarkCall
dP: Atom.DottedPair => SELECT dP.key FROM
$audioSource => {info.audioSource _ NARROW[dP.val]; sw_TRUE; };
$transmitOnly => {info.transmitOnly _ dP.val=$true;sw_TRUE; };
$textToSpeech => info.textToSpeech _ dP.val=$true;
$phoneNumber => ropeSpec _ NARROW[dP.val];
ENDCASE; -- unknown
ENDCASE; -- unknown
ENDLOOP;
IF connectionSpec # NIL AND info.forwardedCall THEN TRUSTED {
IF info.blinkProcess=NIL THEN Process.Detach[info.blinkProcess _ FORK BlinkLED[info]];
};

SELECT trans FROM
nop => NULL; -- Certifiably nothing at all to do, unless there's data or some submode has changed.
set => { info.larkState_newState; RETURN; };
X => {info.audioSource _ NIL; info.transmitOnly _ FALSE;
FailInt[info, "Invalid LarkState Transition", TRUE]; RETURN;};
zap, zpu, zpn => { info.audioSource _ NIL; info.transmitOnly _ FALSE; };
ENDCASE;
IF tClrFwd[trans] = clrFwd THEN info.forwardedCall _ FALSE;
IF tSetFwd[trans] = setFwd THEN {
newState _ IF info.forwardedCall THEN trunkForwarding ELSE trunkTalking;
trans _ lsTrans[info.larkState][newState];
};
info.larkState_newState;
IF tDisconn[trans] = $disconnect THEN {
IF ThNet.pd.debug THEN Deb[ info, "Rq disconnect" ];
QueueLarkAction[info, aDisconnect];
};
toneSpec _ SELECT trans FROM
dia, diu => dialTone, -- to handset receiver
rbk, rbu => IF toneSpec#NIL THEN toneSpec ELSE ringbackTone,
bzy, bzu => busyTone,
err, eru => errorTone,
rng, rgu => toneSpec,
ENDCASE => NIL
;
SELECT tDoTones[trans] FROM
doTones => {
IF ThNet.pd.debug THEN Deb[ info, "Rq tones" ];
IF toneSpec#NIL THEN QueueLarkAction[info, toneSpec];
};
stopTones => { IF ThNet.pd.debug THEN Deb[ info, "Rq stop tones" ]; QueueLarkAction[info, aNoTones]; };
ENDCASE;
SELECT tHookState[trans] FROM
reset => {
SELECT info.switchState FROM
$monitor, $speaker => info.switchState_$onhook; -- going totally idle
ENDCASE;
};
spkrTrans => IF info.switchState=$onhook THEN -- dialtone, direct connect or ringback
info.switchState _ $speaker;
ENDCASE; -- no state change cases.
IF info.switchState#info.lastSwitchState THEN sw_TRUE;
SELECT tSwitch[trans] FROM
switch => sw_TRUE;
switchIfDiff => IF oldState<firstTone OR newState<firstTone THEN sw_TRUE;
ENDCASE;
SELECT trans FROM
sgl, sgn =>  {
IF ThNet.pd.debug THEN Deb[info, "Rq feeping"];
feepSpecs _ RopeToDTMF[ropeSpec];
pd.noisyFeeps _ feepSpecs.audible AND ~info.forwardedCall;
};
ENDCASE;
IF sw THEN TRUSTED {
command: ROPE _ larkCommands[info.switchState][newState];
IF ThNet.pd.debug THEN Deb[info, "Rq switching", rope[command]];
otherAction _ QueueCommandSequence[info, command, @info.lState, info.scratchEv];
IF trans=fls THEN {
Process.Detach[FORK FlashWait[info, oldState]];
info.larkState _ oldState; -- never really enter fls state, stay in forwarding or trunkTalking.
};
info.lastSwitchState _ info.switchState;
};
IF feepSpecs#NIL THEN QueueLarkAction[info, feepSpecs];
IF keyTable#NIL THEN {
IF ThNet.pd.debug THEN Deb[info, "Rq key distribution"];
keyTablesToDate _ (info.keyTableDistrsRequested _ info.keyTableDistrsRequested+1);
QueueLarkAction[info, keyTable];
};
IF connectionSpec#NIL THEN {
IF ThNet.pd.debug THEN Deb[info, "Rq connection"];
SELECT trans FROM
sup, spn, tlk, frd, frn =>
QueueLarkAction[info, connectionSpec];
sgl, sgn, ksp =>
IF info.forwardedCall THEN QueueLarkAction[info, connectionSpec];
ENDCASE;
};
IF larkCall#NIL THEN SELECT tLarkCall[trans] FROM
call => QueueLarkAction[info, larkCall];
ENDCASE;
IF otherAction#NIL THEN {
IF ThNet.pd.debug THEN Deb[info, "Rq other action"];
QueueLarkAction[info, otherAction];
};
IF keyTable#NIL THEN WHILE keyTablesToDate > info.keyTablesDistributed DO
WAIT info.keySynch; -- Be sure keys have really been delivered
ENDLOOP;
};

TonesDone: PUBLIC ENTRY PROC[info: LarkInfo, commandEvent: Lark.StatusEvent ] = {
Deb[info, "Tones done detected"];
SELECT commandEvent.event FROM
'F=> -- Feeping complete
{
IF info.larkState#trunkSignalling THEN RETURN;
EnterLarkSt[info, trunkTalking, NIL];
};
ENDCASE => -- other tones finished.
QueueLarkAction[info, NEW[ATonesDoneType _ [commandEvent.event]]];
};

FlashWait: PUBLIC ENTRY PROC[info: LarkInfo, oldState: LarkState] = TRUSTED {
ENABLE UNWIND => NULL;
flashWait: CONDITION;
command: ROPE;
IF info=NIL OR info.failed THEN RETURN;
Process.SetTimeout[@flashWait, Process.MsecToTicks[pd.flashWaitTime]]; -- 600 ms or so.
Deb[info, "Waiting for flash timeout"];
WAIT flashWait;
command _ larkCommands[info.switchState][info.larkState];
Deb[info, "Flash timeout complete, restoring switching", rope[command]];
IF info.larkState#oldState THEN RETURN; -- something has gone wrong
[]_QueueCommandSequence[info, command, @info.lState, info.scratchEv];
info.inputQueue.QueueClientAction[ThSmartsPrivate.FlashDone, info];
};

BlinkLED: PUBLIC ENTRY PROC[info: LarkInfo] = TRUSTED {
ENABLE UNWIND => NULL;
blinkWait: CONDITION;
IF info=NIL THEN RETURN;
Deb[info, "Rq Begin blinking"];
WHILE info.forwardedCall AND info.larkState >= trunkSignalling AND info.larkState <= trunkFlashing AND info.larkProcess#NIL AND ~info.failed DO
[]_QueueLarkAction[info, aToggleLED];
Process.SetTimeout[@blinkWait, Process.MsecToTicks[pd.blinkWaitTime]]; -- 500 ms or so.
WAIT blinkWait;
ENDLOOP;
Deb[info, "Rq End blinking"];
info.blinkProcess _ NIL;
};

QueueFeeps: PUBLIC PROC[sInfo: SmartsInfo, feeps: Rope.ROPE ] = {
EnterLarkState[sInfo.larkInfo, trunkSignalling,
LIST[NEW[Atom.DottedPairNode_[$phoneNumber, feeps]]]];
};

SetupTimeouts: PUBLIC ENTRY PROC[info: LarkInfo, debugging: BOOL ] = {
larkParams: LarkOps.LarkParameters _ NEW[LarkOps.LarkParametersRec[4]];
RPC.SetMaxTransmissions[
conversation: info.shh,
maxTransmissions: pd.toLarkTimeoutTransmissions,
timeoutEnable: SELECT pd.toLarkTimeoutOK FROM
always => always, never => never, unlessDebugging =>
IF debugging THEN never ELSE always, ENDCASE=>dontCare];
larkParams[0] _ [prDefaultMaxTransmissions, pd.fromLarkTimeoutTransmissions];
larkParams[1] _ [prSignalTimeout, LOOPHOLE[SELECT pd.fromLarkTimeoutOK FROM
always => TRUE, never => FALSE, unlessDebugging => ~debugging, ENDCASE=>ERROR]];
larkParams[2] _ [prEventTimer, pd.larkEventTimer];
larkParams[3] _ [prTimeoutEvents, LOOPHOLE[SELECT pd.larkTimeoutEvents FROM
always => TRUE, never => FALSE, unlessDebugging => ~debugging, ENDCASE=>ERROR]];
larkParams.numParams _ 4;
[]_QueueLarkAction[info, larkParams];
};

Fail: PUBLIC ENTRY PROC[info: LarkInfo, reason: ROPE, informLark: BOOL_FALSE] = {
ENABLE UNWIND => NULL;
FailInt[info, reason, informLark];
};
FailInt: PUBLIC INTERNAL PROC[info: LarkInfo, reason: ROPE, informLark: BOOL_FALSE] = {
IF info=NIL OR info.failed THEN {
VoiceUtils.ReportFR[Rope.Concat["%g Lark failed: ", reason], $Lark, info, TU.RefAddr[info.larkSmartsInfo]];
RETURN;
};
VoiceUtils.ProblemFR[Rope.Concat["%g Lark failed: ", reason], $Lark, info, TU.RefAddr[info.larkSmartsInfo]];
info.keyTablesDistributed _ info.keyTableDistrsRequested;
BROADCAST info.keySynch;
info.larkProcess _ NIL;
info.audioSource _ NIL;
info.transmitOnly _ FALSE;
info.failed _ TRUE;
NOTIFY info.stateChange; -- Be sure process notices failure and disappears.
IF informLark AND (SELECT pd.informLarkOK FROM
never =>FALSE, always =>TRUE, unlessDebugging => ~info.debugging, ENDCASE=>ERROR)
THEN []_LarkRemoteControl.BootLark[info.netAddress]; -- best efforts only
info.inputQueue.QueueClientAction[ThSmartsPrivate.Deregister, info];
};

LarkSupervisor: PROCEDURE[ info: LarkInfo ] = {
ENABLE UNWIND => NULL;
req: REF;

WaitForAction: ENTRY PROC[info: LarkInfo] RETURNS [ref: REF_NIL] = TRUSTED {
ENABLE UNWIND=>NULL;
DO
elt: LIST OF REF _ info.newActions;
IF info.failed THEN RETURN[NIL];
IF elt # NIL THEN {
ref_elt.first;
info.newActions _ elt.rest;
RETURN[ref];
};
Process.SetTimeout[@info.stateChange, Process.MsecToTicks[pd.idleWaitTime]];
IF info.larkState#$idle THEN WAIT info.stateChange;
IF info.newActions = NIL THEN {
IF info.nextToneList#NIL THEN FailInt[info, "Tones done notification was late", TRUE]; -- Notification is late.
RETURN[NIL];
};
ENDLOOP;
};

IF info.larkToneSpec=NIL THEN
info.larkToneSpec _ NEW[Lark.ToneSpecRec _ [volume: 0, totalTime: 0, tones: NIL]];
IF info.cSpec=NIL THEN
info.cSpec _ NEW[Lark.ConnectionSpecRec _ [
protocol: interactive,
encoding: muLaw,
sampleRate: 8000,
packetSize: 160,
buffer: in1,
keyIndex: IF ThNet.pd.encryptVoice THEN 1 ELSE 0,
localSocket: [[0],[0], Pup.nullSocket],
remoteSocket: [[0],[0], Pup.nullSocket]
]];
TRUSTED {
Process.EnableAborts[@info.stateChange];
Process.EnableAborts[@info.keySynch];
Process.SetTimeout[@info.stateChange, Process.MsecToTicks[pd.keySynchTime]];
};
StopMulticast[info];
Multicast.StopHandlingMulticast[shh: info.shh, realHost: info.netAddress.host];
WHILE (req_WaitForAction[info])#NIL  DO
-- Deal with communications failure.
ENABLE {
RPC.CallFailed => { Fail[info, "Call Timed Out", TRUE]; GOTO Failed; };
ABORTED => { Fail[info, "LarkSupervisor aborted", TRUE]; GOTO Failed; };
};

DoTones: PROC[newTones: BOOL] = { -- Does one tone from current list of tones
IF info.nextToneList=NIL THEN RETURN;
info.larkToneSpec.volume _ info.toneSpec.volume;
info.expectedNotification _
IF info.expectedNotification='z THEN 'a ELSE info.expectedNotification+1;
info.larkToneSpec.notification _ [tones, info.expectedNotification];
info.larkToneSpec.tones _ info.nextToneList.first;
[]_info.interface.SpecifyTones[shh: info.shh, queueIt: ~newTones, tones: info.larkToneSpec];
};

WITH req SELECT FROM
d: REF ADisconnectType =>
IF info.spec#NIL THEN {
buf: Lark.VoiceBuffer _ out1;
info.interface.Disconnect[ shh: info.shh, buffer: in1  ]; -- always stop in1 (tx1)
FOR i: NAT IN [1..info.spec.conversationInfo.numActive) DO
Deb[info, "Do disconnect per request", card[i]];
info.interface.Disconnect[ shh: info.shh, buffer: buf  ]; -- out1 (tx1) through outn (txn)
buf _ SUCC[buf];
ENDLOOP;
IF info.multicasting THEN StopMulticast[info];
info.spec _ NIL;
};
spec: ThParty.PartyInfo => {
cSpec: Lark.ConnectionSpec = info.cSpec;
numActive: NAT _ spec.conversationInfo.numActive;
conference: BOOL _ numActive>=3;
IF ~conference AND info.multicasting THEN StopMulticast[info];
IF info.spec#NIL THEN { -- Duplicate of ADisconnectType stuff, for now
buf: Lark.VoiceBuffer _ out1;
Deb[info, "Do disconnect transmit to connect"];
info.interface.Disconnect[ shh: info.shh, buffer: in1  ]; -- always stop in1 (tx1)
FOR i:NAT IN [1..info.spec.conversationInfo.numActive) DO
Deb[info, "Do disconnect receive prior to connect", card[i]];
info.interface.Disconnect[ shh: info.shh, buffer: buf  ];
buf _ SUCC[buf];
ENDLOOP;
};
IF numActive>=2 THEN {
info.spec _ spec;
IF conference THEN conference _ StartMulticast[info, spec.conversationInfo.conferenceHost];
cSpec.buffer _ in1;
cSpec.remoteSocket _ spec[1].socket;
cSpec.remoteSocket.socket _ spec[0].socket.socket;
IF conference THEN cSpec.remoteSocket.host _ spec.conversationInfo.conferenceHost.host;
cSpec.localSocket _ cSpec.remoteSocket; -- superstition
Deb[info, "Connect transmit buf", card[cSpec.remoteSocket.host]];
info.interface.Connect[shh: info.shh, specs: cSpec ]; 
cSpec.buffer _ out1;
FOR i: NAT IN [1..numActive) DO
cSpec.localSocket _ spec[i].socket;
IF conference THEN cSpec.localSocket.host _ spec.conversationInfo.conferenceHost.host;
cSpec.remoteSocket _ cSpec.localSocket; -- superstition
Deb[info, "Connect receive buf", card[i], card[cSpec.localSocket.host]];
info.interface.Connect[shh: info.shh, specs: cSpec ];
cSpec.buffer _ SUCC[cSpec.buffer];
ENDLOOP;
};
}; 
keyTable: Lark.KeyTable => {
UKT: ENTRY PROC[info: LarkInfo] = INLINE {
info.keyTable _ keyTable;
info.keyTablesDistributed _ info.keyTablesDistributed + 1;
BROADCAST info.keySynch;
};
info.interface.SetKeyTable[shh: info.shh, table: keyTable];
UKT[info];
};
ts: LarkPlay.ToneSpec => {
info.toneSpec_ts;
info.nextToneList _ info.toneSpec.tones;
DoTones[TRUE];
};
lC: ThSmartsPrivate.LarkCall => lC.proc[info, lC.clientData];
td: REF ATonesDoneType => IF info.toneSpec#NIL THEN {
IF td.event#info.expectedNotification THEN {
Fail[info, "Tones notifications out of order", TRUE]; GOTO Failed; };
IF info.nextToneList#NIL AND info.nextToneList.rest#NIL THEN
info.nextToneList _ info.nextToneList.rest
ELSE IF NOT info.toneSpec.repeatIndefinitely THEN { info.toneSpec_NIL; info.nextToneList_NIL }
ELSE info.nextToneList _ info.toneSpec.tones;
IF info.nextToneList#NIL THEN DoTones[FALSE];
};
a: REF ANoTonesType => {
info.toneSpec_NIL; 
info.nextToneList_NIL; 
quenchSpec.tones.first.on _ 0;
[]_info.interface.SpecifyTones[shh: info.shh, tones: quenchSpec, queueIt: FALSE];
};
led: REF AToggleLEDType => {
info.lState.lSw[led] _ IF info.lState.lSw[led] = disabled THEN enabled ELSE disabled;
ledToggler[0] _ [led, info.lState.lSw[led]];
[]_info.interface.Commands[info.shh, ledToggler];
};
resetAction: REF ResetActionType => {
[]_info.interface.Reset[shh: info.shh, rName: "Don't revert"];
IF info.multicasting THEN StopMulticast[info];
IF info.keyboardResetHandler#NIL THEN info.keyboardResetHandler[info];
};
larkParameters: LarkOps.LarkParameters =>
[]_info.interface.SetParameters[shh: info.shh, parameters: larkParameters];
keepAlive: REF BOOL => [] _ info.interface.WhatAreTones[shh: info.shh];
echoParameters: Lark.EchoParameters =>
[]_info.interface.EchoSupression[shh: info.shh, echo: echoParameters];
commands: Lark.CommandEvents =>
IF commands#NIL THEN info.interface.Commands[ info.shh, commands ];
feepSpecs: REF AFeepType => {
IF feepSpecs=NIL THEN LOOP;
IF (quenchSpec.tones.first.on _ feepSpecs.initialDelay)#0 THEN
[]_info.interface.SpecifyTones[shh: info.shh, tones: quenchSpec, queueIt: FALSE];
[]_info.interface.Feep[
shh: info.shh, on: feepSpecs.on, off: feepSpecs.off, notify: [tones, 'F],
waveTable: ThNet.pd.feepVolume, queueIt: TRUE, events: feepSpecs.digits];
}
ENDCASE;
REPEAT Failed => NULL;
ENDLOOP;
info.larkProcess _ NIL;
};

StartMulticast: PROC[info: LarkInfo, hostAddress: Thrush.NetAddress]
RETURNS[ok: BOOL_TRUE] = {
IF info.multicasting THEN StopMulticast[info];
IF info.spec=NIL OR info.spec.conversationInfo.numActive <=2 THEN RETURN[FALSE];
ok _ Multicast.HandleMulticast[shh: info.shh, net: info.netAddress.net,
realHost: info.netAddress.host, listeningTo: hostAddress.host];
IF ~ok THEN {
VoiceUtils.ProblemFR["Couldn't set multicasting [%g => %g]", $Lark, info,
int[info.netAddress.host], int[hostAddress.host]];
RETURN;
};
info.interface.SetHostNumber[shh: info.shh, host: [hostAddress.net, hostAddress.host]];
info.multicasting _ TRUE;
};

StopMulticast: PROC[info: LarkInfo, force: BOOL_FALSE] = {
IF ~info.multicasting THEN RETURN;
info.interface.SetHostNumber[shh: info.shh, host: [info.netAddress.net, info.netAddress.host]];
Multicast.StopHandlingMulticast[shh: info.shh, realHost: info.netAddress.host];
info.multicasting _ FALSE;
};
QueueLarkAction: PUBLIC INTERNAL PROC[info: LarkInfo, ref: REF] = {
elt: LIST OF REF = LIST[ref];
lst: LIST OF REF = info.lastAction;
IF info.failed THEN FailInt[info, "Additional output requests disregarded", FALSE];
IF info.newActions=NIL THEN info.newActions _ elt ELSE {
IF lst=NIL THEN ERROR;
WITH ref SELECT FROM x: REF BOOL => IF info.newActions#NIL THEN RETURN; ENDCASE;
lst.rest _ elt;
};
info.lastAction _ elt; 
IF info.larkProcess=NIL THEN TRUSTED {
Process.Detach[info.larkProcess _ FORK LarkSupervisor[ info ]]; };
NOTIFY info.stateChange;
};

QueueCommandSequence: INTERNAL PROC[
info: LarkInfo, commands: ROPE,
lState: LONG POINTER TO LState, scratchEv: Lark.CommandEvents]
RETURNS[otherAction: REF_NIL]= TRUSTED {
eventIndex: INTEGER_-1;
c: CHAR;
i: NAT;
index: INTEGER;
event: Lark.Event;
events: Lark.CommandEvents _ scratchEv;
nextState: LState _ [];
len: NAT;
IF commands=NIL THEN RETURN; -- status quo
len _ commands.Length[];
FOR i IN [0..len) DO
SELECT (c_commands.Fetch[i]) FROM 'J, 'j => IF ~pd.backDoorOH THEN LOOP; ENDCASE;
SELECT c FROM
'\040 => LOOP; -- ignore spaces
'Z => { lState^_ [];  otherAction _ resetAction; }; -- Zap; reset hardware to full idle
'X, 'x => { -- Crossbar switch specification, possibly parameterized by next character
param: CHAR _ commands.Fetch[i+1];
outputs: PACKED ARRAY [0..8) OF BOOLEAN;
row: NAT;
wasParam, doIt: BOOL_TRUE;
SELECT param FROM
IN ['0..'9] => wasParam _ FALSE; -- no parameter, just do it.
'A => IF info.audioSource#$linea THEN doIt_FALSE;
'B => IF info.audioSource#$lineb THEN doIt_FALSE;
'r => IF info.audioSource=$linea OR info.audioSource=$lineb THEN doIt_FALSE;
't => IF info.transmitOnly THEN doIt_FALSE; -- inhibit all receive switching.
'F => IF ~pd.noisyFeeps THEN doIt_FALSE; -- caller hears auto-feeping
ENDCASE => doIt_FALSE; -- unrecognized parameter, don't do it;
IF wasParam THEN { i_i+1; param _ commands.Fetch[i+1]; };
row _ Digit[param];
outputs _ LOOPHOLE[nextState.xbar[row]];
IF doIt THEN outputs[Digit[commands.Fetch[i+2]]] _ (c='X);
nextState.xbar[row] _ LOOPHOLE[outputs];
i_i+2;
LOOP;
};
'E, 'e => {
nextState.echoStyle _ commands.Fetch[i_i+1]-'0;
otherAction _ echosOn[nextState.echoStyle];
};
'M, 'm => {
nextState.voiceMode _ SELECT commands.Fetch[i_i+1] FROM
'0 => Lark.o3i1,
'1 => Lark.o2i2,
'2 => Lark.o1i1,
ENDCASE => ERROR;
};
ENDCASE=> {
IF c IN ['a..'z] THEN { event _ Lark.disabled; c_c-('a-'A); }
ELSE event _ Lark.enabled;
IF lStateForLetter[c]#none THEN nextState.lSw[lStateForLetter[c]] _ event;
};
ENDLOOP;
IF nextState=lState^ THEN RETURN;
IF nextState.echoStyle#lState.echoStyle AND otherAction=NIL THEN
otherAction _ echosOff[lState.echoStyle];
FOR iteration: NAT IN [0..1] DO -- 0: compute size; 1: fill in result sequence.
index_-1;
IF nextState.voiceMode#lState.voiceMode THEN
events[index_index+1] _ [voiceMode, nextState.voiceMode];
FOR i: LSwitches DECREASING IN LSwitches DO IF nextState.lSw[i]#lState.lSw[i] THEN
events[index_index+1] _ [lDevs[i], nextState.lSw[i]]; ENDLOOP;
FOR i: NAT IN [0..8) DO IF nextState.xbar[i]#lState.xbar[i] THEN {
outputs: PACKED ARRAY[0..8) OF BOOLEAN = LOOPHOLE[lState.xbar[i]];
nxtOutputs: PACKED ARRAY[0..8) OF BOOLEAN = LOOPHOLE[nextState.xbar[i]];
FOR j: NAT IN [0..8) DO IF outputs[j]#nxtOutputs[j] THEN
events[index_index+1] _ [
Lark.Device[LOOPHOLE[IF nxtOutputs[j] THEN 23 ELSE 22]],
LOOPHOLE[i*16+j] ];
ENDLOOP;
}; ENDLOOP;
IF index=-1 THEN { events_NIL; EXIT; };
IF iteration=0 THEN events _ NEW[Lark.CommandEventSequence[index+1]]; ENDLOOP;
QueueLarkAction[info, events];
lState^ _ nextState;
lState.lSw[xBarAll] _ Lark.disabled;
};

Digit: PROC[c: CHAR] RETURNS [digit: NAT] = INLINE { RETURN[c-'0]; };

RopeToDTMF: PROC [r: Thrush.ROPE] RETURNS [fs: REF AFeepType] = {
len: INT _ MIN[Lark.Passel.LAST, r.Length[]];
ce: Lark.CommandEvents;
ceIndex: INT_0;
number: INTEGER;
fs _ NEW[AFeepType_[]];
FOR rIndex: INT IN [0..len) DO
c: CHAR = r.Fetch[rIndex];
SELECT c FROM
IN ['0..'9], IN ['a..'d], '#, '* => ceIndex _ ceIndex+1;
'P => IF ceIndex#0 THEN ceIndex _ ceIndex+1 ELSE fs.initialDelay _ number*100;
'A => fs.audible _ TRUE;
'O => fs.on _ number*10;
'F => fs.off _ number*10;
IN ['\001..'\037] => number _ c-'\000;
ENDCASE; -- unrecognized, so ignore it.
ENDLOOP;
ce _ NEW[Lark.CommandEventSequence[ceIndex]];
fs.digits _ ce;
ceIndex _ 0;
FOR rIndex: INT IN [0..len) DO
c: CHAR = r.Fetch[rIndex];
val: CHAR _ '\000;
SELECT c FROM
IN ['0..'9] => val _ LOOPHOLE[128 + c - '0];
IN ['a..'d] => val _ LOOPHOLE[138 + c - 'a];
'* => val _ Lark.bStar;
'# => val _ Lark.bThorp;
IN ['\001..'\037] => number _ c-'\000;
'P => IF ceIndex#0 THEN val _ LOOPHOLE[number*10];
ENDCASE;
IF val = '\000 THEN LOOP;
ce[ceIndex] _ [touchPad, val];
ceIndex _ ceIndex+1;
ENDLOOP;
};

SetTones: INTERNAL PROC[] = {
IF ~pd.tonesInvalid THEN RETURN;
pd.tonesInvalid _ FALSE;
dialTone _ NEW[LarkPlay.ToneSpecRec _ [repeatIndefinitely: TRUE,
volume: ThNet.pd.tonesVolume, tones: LIST[LIST[
[f1: 350, f2: 440, on: 5000, off: 0],
[f1: 350, f2: 440, on: 5000, off: 0]]]]]; 
busyTone _ NEW[LarkPlay.ToneSpecRec _ [repeatIndefinitely: TRUE,
volume: ThNet.pd.tonesVolume, tones: LIST[LIST[
[f1: 480, f2: 620, on: 500, off: 500, repetitions: 5],
[f1: 480, f2: 620, on: 500, off: 500, repetitions: 5]]]]]; 
errorTone _ NEW[LarkPlay.ToneSpecRec _ [repeatIndefinitely: TRUE,
volume: ThNet.pd.tonesVolume, tones: LIST[LIST[
[f1: 480, f2: 620, on: 250, off: 250, repetitions: 10],
[f1: 480, f2: 620, on: 250, off: 250, repetitions: 10]]]]]; 
ringbackTone _ NEW[LarkPlay.ToneSpecRec _ [repeatIndefinitely: TRUE,
volume: ThNet.pd.tonesVolume, tones: LIST[LIST[
[f1: 440, f2: 480, on: 2000, off: 4000],
[f1: 440, f2: 480, on: 2000, off: 4000]]]]]; 
};

Deb: PUBLIC PROC[info: LarkInfo, r: ROPE, p1, p2, p3, p4: IO.Value_[null[]]] = {
s: IO.STREAM;
IF ~ThNet.pd.debug THEN RETURN;
s_IO.ROS[];
s.PutF["<%g", rope[r]];
IF p1#[null[]] THEN s.PutF["-- %g", p1];
IF p2#[null[]] THEN s.PutF[", %g", p2];
IF p3#[null[]] THEN s.PutF[", %g", p3];
IF p4#[null[]] THEN s.PutF[", %g", p4];
s.PutRope[">\r"];
VoiceUtils.Report[s.RopeFromROS[], $LarkDetailed, info];
};
QuickState: ARRAY LarkState OF IO.Value = [
rope["none"], rope["idle"], rope["talking"], rope["trunkSignalling"],
rope["trunkTalking"], rope["trunkForwarding"], rope["trunkFlashing"], rope["ringing"], rope["silence"],
rope["dialTone"], rope["ringBack"], rope["busyTone"], rope["errorTone"]];



CommandsForState: TYPE = REF CommandsForStateArray;
CommandsForStateArray: TYPE = ARRAY LarkState OF ROPE;

telsetCommands: CommandsForState _ NEW[CommandsForStateArray _
[  NIL, -- none
"Z", -- idle
"S   Xt01 Xt06 Xr10 XA60 XB70 X14", -- talking
"HI   X02 X06 X14 XF01", -- trunkSignalling
"HIST   X02 Xr10 XA60 XB70 Xt21 Xt26 X14",	-- trunkTalking, codec-assisted electronic mode
"HIE3   X02 X20 X24", -- trunkForwarding, trunk to remote Lark connection.
"ST   X02 Xr10 XA60 XB70 Xt21 Xt26 X14", -- trunkFlashing, on-hook but otherwise trunkTalking.
"R   X03 X06 X14", -- ringing
"S   X14", -- silence
toneStdCommand, toneStdCommand, toneStdCommand, toneStdCommand -- tones
]];
toneStdCommand: ROPE = "S   X01 X14 X06";

monitorCommands: CommandsForState _ NEW[CommandsForStateArray _
[  NIL, -- none
"Z", -- idle
"LS   Xt01  Xt06 Xt03 Xr10 XA60 XB70 X14", -- talking
"HIL   X02 X06 X03 X14 XF01", -- trunkSignalling
"HILST   X02 Xr10 XA60 XB70 Xt21 Xt26 Xt23 X14",	-- trunkTalking, codec-assisted electronic mode
"HILE3   X02 X20 X24", -- trunkForwarding, trunk to remote Lark connection.
"LST   X02 Xr10 XA60 XB70 Xt21 Xt26 Xt23 X14", --trunkFlashing, on-hook but otherwise trunkTalking.
"R X03	X06 X14", -- ringing
"LS   X14", -- silence
toneMonCommand, toneMonCommand, toneMonCommand, toneMonCommand -- tones
]];
toneMonCommand: ROPE = "LS   X01 X03 X14 X06";

speakerCommands: CommandsForState _ NEW[CommandsForStateArray _
[  NIL, -- none
"Z", -- idle
"E1L   Xt03 Xt06 Xr30 XA60 XB70 X14", -- talking
"HIL   X02 X06 XF03", -- trunkSignalling
"HIE2M1TL   Xr30 X02 Xt25 Xt26 X24 Xt53 XA60 XB70", -- trunkTalking, gain-controlled digital mode
"HILE3   X02 X20 X24", -- trunkForwarding, trunk to remote Lark connection. (need gain setting for echo?)
"E2M1TL   Xr30 X02 Xt25 Xt26 X24 Xt53 XA60 XB70", --trunkFlashing, on-hook but otherwise trunkTalking.
"R   X03 X06", -- ringing
"L   X14", -- silence
toneSpkrCommand, toneSpkrCommand, toneSpkrCommand, toneSpkrCommand -- tones
]];
toneSpkrCommand: ROPE = "L   X03 X14 X06";

larkCommands: ARRAY ThSmartsPrivate.SwitchState OF CommandsForState _ [
telsetCommands, -- good as any for "onhook" condition
telsetCommands, -- telset
speakerCommands, -- speaker
speakerCommands, -- sPEAKER
monitorCommands, -- monitor
monitorCommands -- mONITOR
];
echoStyleFD: REF _ NEW[Lark.EchoParameterRecord _[
buffer: out1,
buffer2Controlled: FALSE,
buffer1Controlled: TRUE,
decayTime: 5,
gain: [ 1024, 2048, 2048, 2048, 32767 ]
]];
echoStyleFwd: REF _ echoStyleFD;

echoStyleBD: REF _ NEW[Lark.EchoParameterRecord _[
buffer: in2,
buffer2Controlled: FALSE,
buffer1Controlled: TRUE,
decayTime: 10,
gain: [ 2048, 4096, 8192, 16384, 32767 ]
]];

echoStyleNoFD: REF _ NEW[Lark.EchoParameterRecord _[
buffer: out1, -- not interesting
buffer2Controlled: FALSE,
buffer1Controlled: TRUE, -- 
FALSE, compensates for a Lark bug; restore when fixed
decayTime: 5,
gain: [ 32767, 32767, 32767, 32767, 32767 ]
]];
echoStyleNoFwd: REF _ echoStyleNoFD;

echoStyleNoBD: REF _ NEW[Lark.EchoParameterRecord _[
buffer: in2, -- not interesting
buffer2Controlled: FALSE,
buffer1Controlled: TRUE, -- 
FALSE, compensates for a Lark bug; restore when fixed
decayTime: 5,
gain: [ 32767, 32767, 32767, 32767, 32767 ]
]];

echosOn: ARRAY [0..3] OF REF_[ NIL, echoStyleFD, echoStyleBD, echoStyleFwd ];
echosOff: ARRAY [0..3] OF REF_[ NIL, echoStyleNoFD, echoStyleNoBD, echoStyleNoFwd ];


LSwitches: TYPE = ThSmartsPrivate.LSwitches;
LState: TYPE = ThSmartsPrivate.LState;
lDevs: ARRAY LSwitches OF Lark.Device = [
crossBar, offHookRelay, aRelay, sideTone, ringEnable, revertRelay, revertHookswitch, led, spMode, crossBar--random...not used-- ];
lStateForLetter: ARRAY CHAR['A..'Z] OF LSwitches = [
none, none, none, none, none, -- A to E
revert, revertHook, hook, aSwitch, hook, none, led, -- F to L
none, none, none, none, none, -- M to Q
ringO, sideTone, spMode, none, none, none, none, none, -- R to Y
none  -- Z --
];

LSTrans: TYPE = {
nop, -- nothing to do
set, -- enter specified state (usu. step to recovery) without taking any other actions.
zap, zpu, zpn, -- reset Lark hardware (u means unconnect first, n means silence tones first)
trk, tkn, -- Set for electronic phone connection (n means silence tones first)
frd, frn, -- Trunk-to-network forwarding versions of trk, tkn (frn probably doesn't exist; wrong end <<Sep. FD/BD>>)
tlk, -- like supervision, but must also adjust switching.
sup, spn, -- supervision, OK to change connection, key table. (n means silence tones first)
ksp, -- key supervision, OK to change key table.
sgl, sgn, -- Do trunk signalling (n means silence tones first)
fls, -- Flash the phone line
rng, rgu, -- Set for ringing (u means unconnect first, r means repeating tone)
dia, diu, -- Set for dial tone (tones should be more generic and user-programmable than this!)
rbk, rbu, -- Set for ring back
bzy, bzu, -- Set for busy tone
err,  eru, -- Set for error tone
sil, -- silence tones, ksp obtains
X -- invalid transition; complain, then remain in present state (go idle?)
};

lsTrans: ARRAY LarkState OF ARRAY LarkState OF LSTrans = [[
nop, zap, X,   X,   X,   X,   X,  X,   X,   X,   X,   X,   err ],[--non (none)
X,   nop, spn, sgl, trk, frd, X,  rng, nop, dia, rbk, bzy, err ],[--idl (idle)
X,   zpu, sup, X,   X,   X,   X,  rgu, nop, diu, rbu, bzu, eru ],[--tlk (talking)
X,   zpn, X,   ksp, trk, frd, X,  X,   nop, X,   X,   X,   X   ],[--sig (trunkSignling)
X,   zap, X,   sgl, ksp, X,   fls,X,   nop, X,   X,   X,   X   ],[--trk (trunkTalking)
X,   zpu, X,   sgl, X,   sup, fls, X,   nop, diu, rbu, bzu, eru ],[--fwd (trunkFwding)
X,   zap, X,   X,   trk, X,   sup,X,   nop, X,   X,   X,   X   ],[--fls (trunkFlash)
X,   zpn, spn, sgn, tkn, frn, X,  ksp, sil, dia, rbk, bzy, err ],[--rng (ringing)
X,   zap, tlk, sgl, trk, frd, X,  rng, ksp, dia, rbk, bzy, err ],[--shh (silence)
X,   zpn, spn, sgn, tkn, frn, X,  rng, sil, ksp, rbk, bzy, err ],[--dia (dialTone)
X,   zpn, spn, sgn, tkn, frn, X,  rng, sil, dia, ksp, bzy, err ],[--rbk (ringBack)
X,   zpn, spn, sgn, tkn, frn, X,  rng, sil, dia, rbk, ksp, err ],[--bzy (busyTone)
X,   zpn, spn, sgn, tkn, frn, X,  rng, sil, dia, rbk, bzy, ksp ]  --err (errTone)
];

TDisconn: TYPE = { X, disconnect };
tDisconn: ARRAY LSTrans OF TDisconn = [ -- zpu, rgu, diu, rbu, bzu, eru
X, X, X, disconnect, X, X, X,  X, X, X, X, X, X, X, X,  X, X, disconnect, X,  disconnect, X, disconnect, X, disconnect,  X, disconnect, X, X ];

TDoTones: TYPE = { X, doTones, stopTones };
tDoTones: ARRAY LSTrans OF TDoTones = [ -- rng, rgu,   dia, diu,   rbk, rbu,   bzy, bzu,   err, eru;    zpn, tkn, frn, spn, sgn, sil
X, X, X, X, stopTones, X, stopTones,  X, stopTones, X, X, stopTones, X, X, stopTones,  X, doTones, doTones, doTones,  doTones, doTones, doTones, doTones, doTones,  doTones, doTones, stopTones, X ];

THookState: TYPE = { X, reset, spkrTrans };
tHookState: ARRAY LSTrans OF THookState = [ -- zap, zpu, zpn;   trk, tkn, tlk, spn, fls, dia, diu, rbk, rbu, bzy, bzu, err, eru, sil
X, X, reset, reset, reset, spkrTrans, spkrTrans,  X, X, spkrTrans, X, spkrTrans, X, X, X,  spkrTrans, X, X, spkrTrans,  spkrTrans, spkrTrans, spkrTrans, spkrTrans, spkrTrans,  spkrTrans, spkrTrans, spkrTrans, X ];

TSwitch: TYPE = { X, switch, switchIfDiff };
tSwitch: ARRAY LSTrans OF TSwitch = [
X, X, switch, switch, switch, switch, switch,  switch, switch, switch, X, switch, X, switch, switch,  switch, switchIfDiff, switchIfDiff, switchIfDiff,  switchIfDiff, switchIfDiff, switchIfDiff, switchIfDiff, switchIfDiff,  switchIfDiff, switchIfDiff, switch, X ];


TSetFwd: TYPE = { X, setFwd };
tSetFwd: ARRAY LSTrans OF TSetFwd = [
X, X, X, X, X, setFwd, setFwd,  X, X, X, X, X, X, X, X,  X, X, X, X,  X, X, X, X, X,  X, X, X, X ];

TClrFwd: TYPE = { X, clrFwd };
tClrFwd: ARRAY LSTrans OF TClrFwd = [
X, X, clrFwd, clrFwd, clrFwd, X, X,  X, X, clrFwd, X, X, X, X, X,  X, clrFwd, clrFwd, clrFwd,  clrFwd, clrFwd, clrFwd, clrFwd, clrFwd,  clrFwd, clrFwd, clrFwd, clrFwd ];

TLarkCall: TYPE = { X, call };
tLarkCall: ARRAY LSTrans OF TLarkCall = [
call, X, X, X, X, call, call,  call, call, call, call, call, call, X, X,  X, X, X, X,  X, X, X, X, X,  X, X, X, X ];


ADisconnectType: TYPE = { aDisconnect };
aDisconnect: REF ADisconnectType _ NEW[ADisconnectType_aDisconnect];

ResetActionType: TYPE = { resetAction };
resetAction: REF ResetActionType _ NEW[ResetActionType_resetAction];

AFeepType: TYPE = RECORD [
initialDelay: CARDINAL _ pd.waitForTelco,
on: CARDINAL _ pd.telcoMinOn,
off: CARDINAL _ pd.telcoMinOff,
audible: BOOL_FALSE,
digits: Lark.CommandEvents_NIL
];

ANoTonesType: TYPE = { aNoTones };
aNoTones: REF ANoTonesType _ NEW[ANoTonesType_aNoTones];

ATonesDoneType: TYPE = RECORD [
event: Lark.Event
];

AToggleLEDType: TYPE = { aToggleLED };
aToggleLED: REF AToggleLEDType _ NEW[AToggleLEDType_aToggleLED];
ledToggler: Lark.CommandEvents _ NEW[Lark.CommandEventSequence[1]];

ViewCmd: Commander.CommandProc = TRUSTED {
Nice.View[pd, "Lark Out PD"];
};
Commander.Register["VuLarkOut", ViewCmd, "Program Management variables for Lark Output"];
}.
(ÊLarkOutImpl.mesa 
Copyright Ó 1985, 1986, 1987 by Xerox Corporation.  All rights reserved.
Polle Zellweger (PTZ) November 4, 1985 8:42:01 pm PST
Last modified by D. Swinehart, April 6, 1987 8:20:50 am PDT
Declarations
Whether to let RPC calls from server to Lark time out.  The default is to do so iff the database indicates the Lark is not in operational mode.
When asked to boot the Lark during Lark failure, determines the conditions under which the request is granted: always, never, or only unless debugging, as with timeouts.
Determines what to tell the Lark to do about server timeouts.
External  Procedures
Relevant only for trunk calls.  The hosts are different, so the local trunk is communicating to a remote Etherphone.  See LarkSmartsSupImpl for more discussion of these connections.  We don't handle conferences involving trunks, thus the numParties=2 test.  Higher level code assures this.  In this state, the LED flashes to let the user know why the switch hook and attempts to place calls don't work.
Each select statement combines cases to execute a subset of the required actions efficiently.
If trunkTalking was requested, we must enter either trunkTalking or trunkForwarding, depending on whether the other end of the connection is on the same machine.
When leaving talking state but not going idle, must explicitly take down Ethernet connection.
Does this ever happen?
Queue up request to eliminate connections.
Select tone/tune specifications.
Go offhook and enter speakerphone mode if noises need to be heard and phone isn't offhook
Go back onhook when idling from spkr (not sPkr) or monitor mode.
Must follow switching, but calculations must precede it.
Otherwise we'd be transmitting stuff for no reason.
Revert to the previous switching condition
Server to Lark
Lark to Server

Internal  Procedures
Issue an input "failed" event.
In a loop, keep the state of the Lark up to date.  Awakens itself whenever any pending
tone is otherwise likely to time out.  Awakened by EnterLarkState whenever the state
of tones, switches, and the like might have to change.
When initializing the supervisor process, multicasting should already be off for this host.  But be as careful as possible here: stop any that's detectably going on, and in any case, turn off multicast forwarding for this host.
If conferencing, set up multicasting for this host, first.
Transmit buffer
Receive buffers
See ThsmartsPrivate.LarkCall
<<NIL => revert.  Remember to change 2d parameter next time Lark.mesa changes.>>
Just pings the Lark; will fail if the call times out.

Queue is a FIFO list of REFs, with a lastAction pointer to aid in rapid enqueuing. 
Ref BOOL's are just keep-alive polls.  Don't add them to a non-empty queue.
See Hardware Switching Tables below for interpretations of these command sequences.
Parameters determine whether this crossbar specification should be obeyed depending on outside influences, like "line(A/B) mode" or global indications of whether automatically-generated touch-tones should be heard by the caller.
Hardware Switching Tables
Interpretation of the command string characters:
En-- echo mode; n IN [0..3); selects echoStyleStd (default), ...FD, ...BD, or ...Fwd
F -- T/R lead reversion
G -- A/A1 hookswitch control reversion
H -- Assert Telewall hookswitch
I -- Assert A/A1 to Telewall
J -- Assert Telewall hookswitch, maybe (depends on boolean variable)
L -- Lights led
l -- Flashes led if trunk is forwarding a call.
R -- overrides volume control for ringing through speaker
S -- enables telset sidetone
T -- spMode; configures codecs for electronic trunk action
Xij -- connects crossbar input i to output j
Xmij -- connects crossbar input i to output j, conditionally
Conditions:
A -- only in lineA mode (input comes from line 1 in instead of telset or microphone)
B -- only in lineB mode (input comes from line 2 in instead of telset or microphone)
r -- only in non-radio (standard, non-lineA/B) mode
t -- inhibit in transmit-only mode (server stuff)
F -- only if feeping (touch-tone signalling) is to be audible.
Mn -- voiceMode; n IN [0..2); selects program O3I1 (default), O2I2, or O1I1
Z -- Resets hardware and crossbar
Radio mode: input comes from line 1 in instead of telset or microphone

Crossbar Connections:
Port	Input	Output
0	dec1	co1
1	Xmtr	Rcvr
2	from Telewall	to Telewall
3	mike	speaker
4	silence	DTMF receiver
5	dec2	co2
6	line 1 in	line 1 out
7	line 2 in	line 2 out
larkCommands: ARRAY ThSmartsPrivate.SwitchState OF CommandsForState _ [
telsetCommands, -- good as any for "onhook" condition
telsetCommands, -- telset
speakerCommands, -- speaker
speakerCommands, -- sPEAKER
monitorCommands, -- monitor
monitorCommands -- mONITOR
];

Telset
"Z", -- trunkFlashing, on-hook for a second.
Monitoring Telset
"Z", -- trunkFlashing, on-hook for a second.
Speakerphone
"Z", -- trunkFlashing, on-hook for a second.

Front Door call using Speakerphone
Back Door call using Speakerphone
Standard FD or BD handset mode, no forwarding
Standard FD or BD handset mode, no forwarding
State tables
non  idl  tlk  sig  trk  fwd  fls rng  shh  dia  rbk  bzy  err _new old \/
Subtransition codes and tables
zap, zpu, zpn, trk, tkn, frd, frn, tlk, spn, sgl, sgn, fls;  rng, rgu, dia, diu, rbk, rbu, bzy, bzu, err, eru
trk, tkn
all but nop, set, trk, tkn, frd, frn, sup, spn, ksp, sgl, sgn, fls 
nop, trk, tkn, frd, frn, tlk, sup, spn, ksp
Queued specifications for Supervisor
ASpeechDoneType: TYPE = RECORD [
indexMarker: INT
];

Swinehart, June 14, 1985 5:22:47 pm PDT
Repair Echo stuff
changes to: resetAction (local of LarkSupervisor) explicitly request resets on Z, LarkSupervisor ditto, QueueCommandSequence larkCommands, echosOn, echosOff, ZapEchosType, zapEchos, ANoTonesType, echoStyleNoFD, echoStyleNoBD

Swinehart, July 16, 1985 2:15:11 pm PDT
Fixes to trunkSignalling, trunkForwarding
changes to: EnterLarkSt
Swinehart, August 6, 1985 2:12:11 pm PDT
Merge with PTZ Prose additions
changes to: EnterProseQueue, ASpeechDoneType, ViewCmd
Polle Zellweger (PTZ) July 3, 1985 7:11:31 pm PDT
changes to: DIRECTORY, EnterLarkSt, IntIDQueue, IntIDTranslate, IntIDTranslateBody, EnterIntIDQueue (local of LarkSupervisor), RemoveIntIDQueue (local of LarkSupervisor), LarkSupervisor, HandleProseOutput
Polle Zellweger (PTZ) July 11, 1985 6:20:12 pm PDT
changes to: indexMarkerEnd(public), maxClientMarker(public), LarkSupervisor, ps (local of LarkSupervisor), pd (local of LarkSupervisor), ProseControlDone, EnterProseQueue(replaced EnterIntIDQueue)
removed: RemoveIntIDQueue (function now in LarkInImpl), minClientMarker, minControlMarker, maxControlMarker, speechDoneMarker, DIRECTORY, pResetConfirmOK, cmdLeader, indexMarkerLen, SpeakText (local of LarkSupervisor)
Polle Zellweger (PTZ) July 16, 1985 6:40:42 pm PDT
Fix multiple packets bug.
changes to: LarkSupervisor -- add proseActive & handle incoming speechDoneMarkers correctly=> SpeakText (local of LarkSupervisor), ps (local of LarkSupervisor), pd (local of LarkSupervisor)
Polle Zellweger (PTZ) July 18, 1985 5:18:49 pm PDT
new version of SpeakText preloads Prose and then sends only 1 packet at a time.
changes to: DIRECTORY, LarkOutImpl, LarkSupervisor, SpeakText (local of LarkSupervisor), pd (local of LarkSupervisor), SpeakText, ps (local of LarkSupervisor)
Polle Zellweger (PTZ) July 19, 1985 6:34:34 pm PDT
Make sure not to break in the middle of a client marker!!
changes to: SpeakText (local of LarkSupervisor)
Polle Zellweger (PTZ) July 30, 1985 4:41:39 pm PDT
Lark now has its own copy of newProses; must prune out started and finished reports.
changes to: EnterLarkSt
Polle Zellweger (PTZ) August 19, 1985 5:03:15 pm PDT
Handle Prose flushing.
changes to: maxTextPktLen, maxPkts, numPkts, LarkSupervisor, SpeakText (local of LarkSupervisor), ps (local of LarkSupervisor), pd (local of LarkSupervisor), FilterText, ProseControlDone
Polle Zellweger (PTZ) August 27, 1985 8:58:36 pm PDT
Move local variables from LarkOutImpl.LarkSupervisor into LarkInfo record.  These variables are locked by the serial nature of the Lark Supervisor rather than by explicit ENTRY procedures.  Reset Prose at Lark startup & idle.
changes to: DIRECTORY, ProseCmd, ProseControlDone, minControlMarker, LarkSupervisor, SpeakText (local of LarkSupervisor), ps (local of LarkSupervisor), pd (local of LarkSupervisor), resetAction (local of LarkSupervisor), FilterText, ProseFlush
Swinehart, October 28, 1985 11:56:38 am PST
Log => VoiceUtils, Handle => ID
changes to: DIRECTORY, LarkOutImpl, ConvDesc, SmartsID, EnterLarkSt, EnterProseQueue, QueueLarkAction
Zellweger (PTZ), November 4, 1985 8:39:52 pm PST
Remove timeout waiting for text-to-speech to report; leave the one for tones in.
changes to: WaitForAction (local of LarkSupervisor)
Swinehart, April 10, 1986 10:05:07 am PST
Revise telset/speakerswitch behavior to integrate $monitor mode, improve things.
changes to: DIRECTORY, SmartsID, PD, EnterLarkSt, FlashWait, QueueCommandSequence, CommandsForState, CommandsForStateArray, larkCommands, telsetCommands, monitorCommands, speakerCommands
Swinehart, May 17, 1986 5:58:28 pm PDT
Cedar 6.1
changes to: LarkSupervisor, StopMulticast
Swinehart, May 25, 1986 10:10:43 pm PDT
Lark => LarkOps
changes to: DIRECTORY, LarkOutImpl
Swinehart, October 21, 1986 5:48:38 pm PDT
Total eradication of remnants of Prose code.  Introduction of LarkCall case, to allow things like synthesizers to participate.  See LarkSynthesizer(impl)
Swinehart, November 25, 1986 4:06:02 pm PST
Remote $recovering state.  It was never used.  Added separate failed bit to LarkInfo.  Use to determine when no action is needed.  On failure, issue an input Failure event.
changes to: EnterLarkSt, Fail, WaitForAction (local of LarkSupervisor), QuickState, telsetCommands, monitorCommands, speakerCommands, LSTrans, lsTrans
Swinehart, December 30, 1986 2:35:44 pm PST
General way to deal with conflicts in usage between telephone line and trunk in Lark.  New LarkState (trkIdle), and all the reactions to it.  ReportConflict allows the conflicting usage to result in an idling of the attempted conflicting conversation.
changes to: EnterLarkSt, LSTrans, lsTrans, tDisconn, tDoTones, tHookState, tSwitch, tSetFwd, tLarkCall, FailInt, ReportConflict
Swinehart, January 1, 1987 10:02:05 pm PST
Push responsibility for FD/BD conflict stuff to higher levels again, remove from this level.  Also improve Zap behavior, I think, wrt transmitOnly, audioSource.
changes to: EnterLarkSt

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