// trafficrecord.cxx - Implementation of AIModels ATC code. // // Written by Durk Talsma, started September 2006. // // Copyright (C) 2006 Durk Talsma. // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License as // published by the Free Software Foundation; either version 2 of the // License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. // // $Id$ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include "trafficcontrol.hxx" #include <AIModel/AIAircraft.hxx> #include <AIModel/AIFlightPlan.hxx> #include <Traffic/TrafficMgr.hxx> #include <Airports/groundnetwork.hxx> #include <Airports/dynamics.hxx> /*************************************************************************** * FGTrafficRecord **************************************************************************/ FGTrafficRecord::FGTrafficRecord() : id(0), waitsForId(0), currentPos(0), leg(0), state(0), latitude(0), longitude(0), heading(0), speed(0), altitude(0), radius(0) { } void FGTrafficRecord::setPositionAndIntentions(int pos, FGAIFlightPlan *route) { currentPos = pos; if (intentions.size()) { intVecIterator i = intentions.begin(); if ((*i) != pos) { SG_LOG(SG_GENERAL, SG_ALERT, "Error in FGTrafficRecord::setPositionAndIntentions"); //cerr << "Pos : " << pos << " Curr " << *(intentions.begin()) << endl; for (intVecIterator i = intentions.begin(); i != intentions.end() ; i++) { //cerr << (*i) << " "; } //cerr << endl; } intentions.erase(i); } else { //int legNr, routeNr; //FGAIFlightPlan::waypoint* const wpt= route->getCurrentWaypoint(); int size = route->getNrOfWayPoints(); //cerr << "Setting pos" << pos << " "; //cerr << "setting intentions "; for (int i = 0; i < size; i++) { int val = route->getRouteIndex(i); //cerr << val<< " "; if ((val) && (val != pos)) { intentions.push_back(val); //cerr << "[set] "; } } //cerr << endl; //while (route->next(&legNr, &routeNr)) { //intentions.push_back(routeNr); //} //route->rewind(currentPos); } //exit(1); } bool FGTrafficRecord::checkPositionAndIntentions(FGTrafficRecord &other) { bool result = false; //cerr << "Start check 1" << endl; if (currentPos == other.currentPos) { //cerr << callsign << ": Check Position and intentions: we are on the same taxiway" << other.callsign << "Index = " << currentPos << endl; result = true; } // else if (other.intentions.size()) // { // cerr << "Start check 2" << endl; // intVecIterator i = other.intentions.begin(); // while (!((i == other.intentions.end()) || ((*i) == currentPos))) // i++; // if (i != other.intentions.end()) { // cerr << "Check Position and intentions: current matches other.intentions" << endl; // result = true; // } else if (intentions.size()) { //cerr << "Start check 3" << endl; intVecIterator i = intentions.begin(); //while (!((i == intentions.end()) || ((*i) == other.currentPos))) while (i != intentions.end()) { if ((*i) == other.currentPos) { break; } i++; } if (i != intentions.end()) { //cerr << callsign << ": Check Position and intentions: .other.current matches" << other.callsign << "Index = " << (*i) << endl; result = true; } } //cerr << "Done !!" << endl; return result; } void FGTrafficRecord::setPositionAndHeading(double lat, double lon, double hdg, double spd, double alt) { latitude = lat; longitude = lon; heading = hdg; speed = spd; altitude = alt; } int FGTrafficRecord::crosses(FGGroundNetwork *net, FGTrafficRecord &other) { if (checkPositionAndIntentions(other) || (other.checkPositionAndIntentions(*this))) return -1; intVecIterator i, j; int currentTargetNode = 0, otherTargetNode = 0; if (currentPos > 0) currentTargetNode = net->findSegment(currentPos )->getEnd()->getIndex(); // OKAY,... if (other.currentPos > 0) otherTargetNode = net->findSegment(other.currentPos)->getEnd()->getIndex(); // OKAY,... if ((currentTargetNode == otherTargetNode) && currentTargetNode > 0) return currentTargetNode; if (intentions.size()) { for (i = intentions.begin(); i != intentions.end(); i++) { if ((*i) > 0) { if ((currentTargetNode == net->findSegment(*i)->getEnd()->getIndex())) { //cerr << "Current crosses at " << currentTargetNode <<endl; return currentTargetNode; } } } } if (other.intentions.size()) { for (i = other.intentions.begin(); i != other.intentions.end(); i++) { if ((*i) > 0) { if (otherTargetNode == net->findSegment(*i)->getEnd()->getIndex()) { //cerr << "Other crosses at " << currentTargetNode <<endl; return otherTargetNode; } } } } if (intentions.size() && other.intentions.size()) { for (i = intentions.begin(); i != intentions.end(); i++) { for (j = other.intentions.begin(); j != other.intentions.end(); j++) { //cerr << "finding segment " << *i << " and " << *j << endl; if (((*i) > 0) && ((*j) > 0)) { currentTargetNode = net->findSegment(*i)->getEnd()->getIndex(); otherTargetNode = net->findSegment(*j)->getEnd()->getIndex(); if (currentTargetNode == otherTargetNode) { //cerr << "Routes will cross at " << currentTargetNode << endl; return currentTargetNode; } } } } } return -1; } bool FGTrafficRecord::onRoute(FGGroundNetwork *net, FGTrafficRecord &other) { int node = -1, othernode = -1; if (currentPos >0) node = net->findSegment(currentPos)->getEnd()->getIndex(); if (other.currentPos > 0) othernode = net->findSegment(other.currentPos)->getEnd()->getIndex(); if ((node == othernode) && (node != -1)) return true; if (other.intentions.size()) { for (intVecIterator i = other.intentions.begin(); i != other.intentions.end(); i++) { if (*i > 0) { othernode = net->findSegment(*i)->getEnd()->getIndex(); if ((node == othernode) && (node > -1)) return true; } } } //if (other.currentPos > 0) // othernode = net->findSegment(other.currentPos)->getEnd()->getIndex(); //if (intentions.size()) // { // for (intVecIterator i = intentions.begin(); i != intentions.end(); i++) // { // if (*i > 0) // { // node = net->findSegment(*i)->getEnd()->getIndex(); // if ((node == othernode) && (node > -1)) // return true; // } // } // } return false; } bool FGTrafficRecord::isOpposing (FGGroundNetwork *net, FGTrafficRecord &other, int node) { // Check if current segment is the reverse segment for the other aircraft FGTaxiSegment *opp; //cerr << "Current segment " << currentPos << endl; if ((currentPos > 0) && (other.currentPos > 0)) { opp = net->findSegment(currentPos)->opposite(); if (opp) { if (opp->getIndex() == other.currentPos) return true; } for (intVecIterator i = intentions.begin(); i != intentions.end(); i++) { if (opp = net->findSegment(other.currentPos)->opposite()) { if ((*i) > 0) if (opp->getIndex() == net->findSegment(*i)->getIndex()) { if (net->findSegment(*i)->getStart()->getIndex() == node) { { //cerr << "Found the node " << node << endl; return true; } } } } if (other.intentions.size()) { for (intVecIterator j = other.intentions.begin(); j != other.intentions.end(); j++) { // cerr << "Current segment 1 " << (*i) << endl; if ((*i) > 0) { if (opp = net->findSegment(*i)->opposite()) { if (opp->getIndex() == net->findSegment(*j)->getIndex()) { //cerr << "Nodes " << net->findSegment(*i)->getIndex() // << " and " << net->findSegment(*j)->getIndex() // << " are opposites " << endl; if (net->findSegment(*i)->getStart()->getIndex() == node) { { //cerr << "Found the node " << node << endl; return true; } } } } } } } } } return false; } void FGTrafficRecord::setSpeedAdjustment(double spd) { instruction.setChangeSpeed(true); instruction.setSpeed(spd); } void FGTrafficRecord::setHeadingAdjustment(double heading) { instruction.setChangeHeading(true); instruction.setHeading(heading); } /*************************************************************************** * FGATCInstruction * **************************************************************************/ FGATCInstruction::FGATCInstruction() { holdPattern = false; holdPosition = false; changeSpeed = false; changeHeading = false; changeAltitude = false; resolveCircularWait = false; double speed = 0; double heading = 0; double alt = 0; } bool FGATCInstruction::hasInstruction() { return (holdPattern || holdPosition || changeSpeed || changeHeading || changeAltitude || resolveCircularWait); } string FGATCController::getGateName(FGAIAircraft *ref) { return ref->atGate(); } void FGATCController::transmit(FGTrafficRecord *rec, AtcMsgId msgId, AtcMsgDir msgDir) { string sender, receiver; int stationFreq = 0; int taxiFreq = 0; string atisInformation; //double commFreqD; switch (msgDir) { case ATC_AIR_TO_GROUND: sender = rec->getAircraft()->getTrafficRef()->getCallSign(); switch (rec->getLeg()) { case 2: case 3: stationFreq = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getDynamics()->getGroundFrequency(rec->getLeg()); taxiFreq = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getDynamics()->getGroundFrequency(3); receiver = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getName() + "-Ground"; atisInformation = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getDynamics()->getAtisInformation(); break; case 4: receiver = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getName() + "-Tower"; break; } break; case ATC_GROUND_TO_AIR: receiver = rec->getAircraft()->getTrafficRef()->getCallSign(); switch (rec->getLeg()) { case 2: case 3: stationFreq = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getDynamics()->getGroundFrequency(rec->getLeg()); taxiFreq = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getDynamics()->getGroundFrequency(3); sender = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getName() + "-Ground"; atisInformation = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getDynamics()->getAtisInformation(); break; case 4: sender = rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getName() + "-Tower"; break; } break; } string text; string taxiFreqStr; char buffer[7]; double heading = 0; string activeRunway; string fltType; string rwyClass; switch (msgId) { case MSG_ANNOUNCE_ENGINE_START: text = sender + ". Ready to Start up"; break; case MSG_REQUEST_ENGINE_START: text = receiver + ", This is " + sender + ". Position " +getGateName(rec->getAircraft()) + ". Information " + atisInformation + ". " + rec->getAircraft()->getTrafficRef()->getFlightRules() + " to " + rec->getAircraft()->getTrafficRef()->getArrivalAirport()->getName() + ". Request start-up"; break; // Acknowledge engine startup permission // Assign departure runway // Assign SID, if necessery (TODO) case MSG_PERMIT_ENGINE_START: taxiFreqStr = formatATCFrequency3_2(taxiFreq); heading = rec->getAircraft()->getTrafficRef()->getCourse(); fltType = rec->getAircraft()->getTrafficRef()->getFlightType(); rwyClass= rec->getAircraft()->GetFlightPlan()->getRunwayClassFromTrafficType(fltType); rec->getAircraft()->getTrafficRef()->getDepartureAirport()->getDynamics()->getActiveRunway(rwyClass, 1, activeRunway, heading); rec->getAircraft()->GetFlightPlan()->setRunway(activeRunway); //snprintf(buffer, 7, "%3.2f", heading); text = receiver + ". Start-up approved. " + atisInformation + " correct, runway " + activeRunway + ", AAA departure, squawk BBBB. " + "For push-back and taxi clearance call " + taxiFreqStr + ". " + sender + " control."; break; case MSG_DENY_ENGINE_START: text = receiver + ". Standby"; break; case MSG_ACKNOWLEDGE_ENGINE_START: taxiFreqStr = formatATCFrequency3_2(taxiFreq); activeRunway = rec->getAircraft()->GetFlightPlan()->getRunway(); text = receiver + ". Start-up approved. " + atisInformation + " correct, runway " + activeRunway + ", AAA departure, squawk BBBB. " + "For push-back and taxi clearance call " + taxiFreqStr + ". " + sender; break; default: break; } double onBoardRadioFreq0 = fgGetDouble("/instrumentation/comm[0]/frequencies/selected-mhz"); double onBoardRadioFreq1 = fgGetDouble("/instrumentation/comm[1]/frequencies/selected-mhz"); int onBoardRadioFreqI0 = (int) floor(onBoardRadioFreq0 * 100 + 0.5); int onBoardRadioFreqI1 = (int) floor(onBoardRadioFreq1 * 100 + 0.5); //cerr << "Using " << onBoardRadioFreq0 << ", " << onBoardRadioFreq1 << " and " << stationFreq << endl; // Display ATC message only when one of the radios is tuned // the relevant frequency. // Note that distance attenuation is currently not yet implemented //cerr << "Transmitting " << text << " at " << stationFreq; if ((onBoardRadioFreqI0 == stationFreq) || (onBoardRadioFreqI1 == stationFreq)) { fgSetString("/sim/messages/atc", text.c_str()); //cerr << "Printing Message: " << endl; } } string FGATCController::formatATCFrequency3_2(int freq) { char buffer[7]; snprintf(buffer, 7, "%3.2f", ( (float) freq / 100.0) ); return string(buffer); } /*************************************************************************** * class FGTowerController * **************************************************************************/ FGTowerController::FGTowerController() : FGATCController() { } // void FGTowerController::announcePosition(int id, FGAIFlightPlan *intendedRoute, int currentPosition, double lat, double lon, double heading, double speed, double alt, double radius, int leg, FGAIAircraft *ref) { TrafficVectorIterator i = activeTraffic.begin(); // Search whether the current id alread has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } // Add a new TrafficRecord if no one exsists for this aircraft. if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { FGTrafficRecord rec; rec.setId(id); rec.setPositionAndHeading(lat, lon, heading, speed, alt); rec.setRunway(intendedRoute->getRunway()); rec.setLeg(leg); //rec.setCallSign(callsign); rec.setAircraft(ref); activeTraffic.push_back(rec); } else { i->setPositionAndHeading(lat, lon, heading, speed, alt); } } void FGTowerController::update(int id, double lat, double lon, double heading, double speed, double alt, double dt) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route TrafficVectorIterator current, closest; if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } // // update position of the current aircraft if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: updating aircraft without traffic record"); } else { i->setPositionAndHeading(lat, lon, heading, speed, alt); current = i; } setDt(getDt() + dt); // // see if we already have a clearance record for the currently active runway ActiveRunwayVecIterator rwy = activeRunways.begin(); // again, a map might be more efficient here if (activeRunways.size()) { //while ((rwy->getRunwayName() != current->getRunway()) && (rwy != activeRunways.end())) { while (rwy != activeRunways.end()) { if (rwy->getRunwayName() == current->getRunway()) { break; } rwy++; } } if (rwy == activeRunways.end()) { ActiveRunway aRwy(current->getRunway(), id); activeRunways.push_back(aRwy); // Since there are no clearance records for this runway yet current->setHoldPosition(false); // Clear the current aircraft to continue } else { // Okay, we have a clearance record for this runway, so check // whether the clearence ID matches that of the current aircraft if (id == rwy->getCleared()) { current->setHoldPosition(false); } else { current->setHoldPosition(true); } } } void FGTowerController::signOff(int id) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id alread has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } // If this aircraft has left the runway, we can clear the departure record for this runway ActiveRunwayVecIterator rwy = activeRunways.begin(); if (activeRunways.size()) { //while ((rwy->getRunwayName() != i->getRunway()) && (rwy != activeRunways.end())) { while (rwy != activeRunways.end()) { if (rwy->getRunwayName() == i->getRunway()) { break; } rwy++; } if (rwy != activeRunways.end()) { rwy = activeRunways.erase(rwy); } else { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: Attempting to erase non-existing runway clearance record in FGTowerController::signoff"); } } if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: Aircraft without traffic record is signing off from tower"); } else { i = activeTraffic.erase(i); } } // NOTE: // IF WE MAKE TRAFFICRECORD A MEMBER OF THE BASE CLASS // THE FOLLOWING THREE FUNCTIONS: SIGNOFF, HAS INSTRUCTION AND GETINSTRUCTION CAN // BECOME DEVIRTUALIZED AND BE A MEMBER OF THE BASE ATCCONTROLLER CLASS // WHICH WOULD SIMPLIFY CODE MAINTENANCE. // Note that this function is probably obsolete bool FGTowerController::hasInstruction(int id) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: checking ATC instruction for aircraft without traffic record"); } else { return i->hasInstruction(); } return false; } FGATCInstruction FGTowerController::getInstruction(int id) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: requesting ATC instruction for aircraft without traffic record"); } else { return i->getInstruction(); } return FGATCInstruction(); } /*************************************************************************** * class FGStartupController * **************************************************************************/ FGStartupController::FGStartupController() : FGATCController() { available = false; lastTransmission = 0; } void FGStartupController::announcePosition(int id, FGAIFlightPlan *intendedRoute, int currentPosition, double lat, double lon, double heading, double speed, double alt, double radius, int leg, FGAIAircraft *ref) { TrafficVectorIterator i = activeTraffic.begin(); // Search whether the current id alread has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } // Add a new TrafficRecord if no one exsists for this aircraft. if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { FGTrafficRecord rec; rec.setId(id); rec.setPositionAndHeading(lat, lon, heading, speed, alt); rec.setRunway(intendedRoute->getRunway()); rec.setLeg(leg); //rec.setCallSign(callsign); rec.setAircraft(ref); rec.setHoldPosition(true); activeTraffic.push_back(rec); } else { i->setPositionAndHeading(lat, lon, heading, speed, alt); } } // NOTE: // IF WE MAKE TRAFFICRECORD A MEMBER OF THE BASE CLASS // THE FOLLOWING THREE FUNCTIONS: SIGNOFF, HAS INSTRUCTION AND GETINSTRUCTION CAN // BECOME DEVIRTUALIZED AND BE A MEMBER OF THE BASE ATCCONTROLLER CLASS // WHICH WOULD SIMPLIFY CODE MAINTENANCE. // Note that this function is probably obsolete bool FGStartupController::hasInstruction(int id) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: checking ATC instruction for aircraft without traffic record"); } else { return i->hasInstruction(); } return false; } FGATCInstruction FGStartupController::getInstruction(int id) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: requesting ATC instruction for aircraft without traffic record"); } else { return i->getInstruction(); } return FGATCInstruction(); } void FGStartupController::signOff(int id) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id alread has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: Aircraft without traffic record is signing off from tower"); } else { i = activeTraffic.erase(i); } } void FGStartupController::update(int id, double lat, double lon, double heading, double speed, double alt, double dt) { TrafficVectorIterator i = activeTraffic.begin(); // Search search if the current id has an entry // This might be faster using a map instead of a vector, but let's start by taking a safe route TrafficVectorIterator current, closest; if (activeTraffic.size()) { //while ((i->getId() != id) && i != activeTraffic.end()) { while (i != activeTraffic.end()) { if (i->getId() == id) { break; } i++; } } // // update position of the current aircraft if (i == activeTraffic.end() || (activeTraffic.size() == 0)) { SG_LOG(SG_GENERAL, SG_ALERT, "AI error: updating aircraft without traffic record"); } else { i->setPositionAndHeading(lat, lon, heading, speed, alt); current = i; } setDt(getDt() + dt); int state = i->getState(); time_t startTime = i->getAircraft()->getTrafficRef()->getDepartureTime(); time_t now = time(NULL) + fgGetLong("/sim/time/warp"); //cerr << i->getAircraft()->getTrafficRef()->getCallSign() // << " is scheduled to depart in " << startTime-now << " seconds. Available = " << available // << " at parking " << getGateName(i->getAircraft()) << endl; if ((now - lastTransmission) > 3 + (rand() % 15)) { available = true; } if ((state == 0) && available) { if (now > startTime) { //cerr << "Transmitting startup msg" << endl; transmit(&(*i), MSG_ANNOUNCE_ENGINE_START, ATC_AIR_TO_GROUND); i->updateState(); lastTransmission = now; available = false; } } if ((state == 1) && available) { if (now > startTime+60) { transmit(&(*i), MSG_REQUEST_ENGINE_START, ATC_AIR_TO_GROUND); i->updateState(); lastTransmission = now; available = false; } } if ((state == 2) && available) { if (now > startTime+80) { transmit(&(*i), MSG_PERMIT_ENGINE_START, ATC_GROUND_TO_AIR); i->updateState(); lastTransmission = now; available = false; } } if ((state == 3) && available){ if (now > startTime+100) { transmit(&(*i), MSG_ACKNOWLEDGE_ENGINE_START, ATC_AIR_TO_GROUND); i->updateState(); lastTransmission = now; available = false; } } // TODO: Switch to APRON control and request pushback Clearance. // Get Push back clearance if ((state == 4) && available){ i->setHoldPosition(false); } }