Added reset group function to API.

LibCarla/source/carla/client/TrafficLight.cpp

@@ -70,5 +70,9 @@ namespace client {
     return result;
   }
 
+  void TrafficLight::ResetGroup() {
+    GetEpisode().Lock()->ResetTrafficLightGroup(*this);
+  }
+
 } // namespace client
 } // namespace carla

LibCarla/source/carla/client/TrafficLight.h

@@ -62,6 +62,9 @@ namespace client {
     /// @note This function calls the simulator
     std::vector<SharedPtr<TrafficLight>> GetGroupTrafficLights();
 
+    // resets the timers and states of all groups
+    void ResetGroup();
+
   };
 
 } // namespace client

LibCarla/source/carla/client/detail/Client.cpp

@@ -322,6 +322,10 @@ namespace detail {
     _pimpl->AsyncCall("freeze_traffic_light", traffic_light, freeze);
   }
 
+  void Client::ResetTrafficLightGroup(rpc::ActorId traffic_light) {
+    _pimpl->AsyncCall("reset_traffic_light_group", traffic_light);
+  }
+
   rpc::VehicleLightStateList Client::GetVehiclesLightStates() {
     return _pimpl->CallAndWait<std::vector<std::pair<carla::ActorId, uint32_t>>>("get_vehicle_light_states");
   }

LibCarla/source/carla/client/detail/Client.h

@@ -202,6 +202,9 @@ namespace detail {
         rpc::ActorId traffic_light,
         bool freeze);
 
+    void ResetTrafficLightGroup(
+        rpc::ActorId traffic_light);
+
     /// Returns a list of pairs where the firts element is the vehicle ID
     /// and the second one is the light state
     rpc::VehicleLightStateList GetVehiclesLightStates();

LibCarla/source/carla/client/detail/Simulator.h

@@ -460,6 +460,10 @@ namespace detail {
       _client.FreezeTrafficLight(trafficLight.GetId(), freeze);
     }
 
+    void ResetTrafficLightGroup(TrafficLight &trafficLight) {
+      _client.ResetTrafficLightGroup(trafficLight.GetId());
+    }
+
     std::vector<ActorId> GetGroupTrafficLights(TrafficLight &trafficLight) {
       return _client.GetGroupTrafficLights(trafficLight.GetId());
     }

PythonAPI/carla/source/libcarla/Actor.cpp

@@ -174,6 +174,7 @@ void export_actor() {
       .def("is_frozen", &cc::TrafficLight::IsFrozen)
       .def("get_pole_index", &cc::TrafficLight::GetPoleIndex)
       .def("get_group_traffic_lights", &GetGroupTrafficLights)
+      .def("reset_group", &cc::TrafficLight::ResetGroup)
       .def(self_ns::str(self_ns::self))
   ;
 }

Unreal/CarlaUE4/Plugins/Carla/Source/Carla/Server/CarlaServer.cpp

@@ -875,6 +875,24 @@ void FCarlaServer::FPimpl::BindActions()
     return R<void>::Success();
   };
 
+  BIND_SYNC(reset_traffic_light_group) << [this](
+      cr::ActorId ActorId) -> R<void>
+  {
+    REQUIRE_CARLA_EPISODE();
+    auto ActorView = Episode->GetActorRegistry().Find(ActorId);
+    if (!ActorView.IsValid() || ActorView.GetActor()->IsPendingKill())
+    {
+      RESPOND_ERROR("unable to reset traffic lights: actors not found");
+    }
+    auto TrafficLight = Cast<ATrafficLightBase>(ActorView.GetActor());
+    if (TrafficLight == nullptr)
+    {
+      RESPOND_ERROR("unable to reset traffic lights: actor is not a traffic light");
+    }
+    TrafficLight->GetTrafficLightComponent()->GetGroup()->ResetGroup();
+    return R<void>::Success();
+  };
+
   BIND_SYNC(get_vehicle_light_states) << [this]() -> R<cr::VehicleLightStateList>
   {
     REQUIRE_CARLA_EPISODE();