Carla: ERROR: (localhost:2000) failed to read data: timed out when run client_example.py

[danxuhk]

When run python client_example.py, an issue of failed to read data appears as:
INFO: listening to server localhost:2000
CarlaClient connected
ERROR: (localhost:2000) failed to read data: timed out
CarlaClient connected
ERROR: (localhost:2000) failed to read data: timed out
CarlaClient connected
ERROR: (localhost:2000) failed to read data: timed out
CarlaClient connected
ERROR: (localhost:2000) failed to read data: timed out

What could be the problem?

[nsubiron]

Try using a different port, it might be that you are connecting to something else.

[danxuhk]

I am using the port 2000 by default, and I am able to run example.py in PythonAPI. But I couldn't run the sample in PythonClient, showing failed to read data. If example.py could connect to the port 2000, should client_example.py also be able to connect to the same port, right?

[nsubiron]

Ah ok, I see. _PythonClient_ no longer works with 0.9.0, we are in the middle of a transition to a new API.

_PythonClient_ only works with versions prior to 0.9.0, and _PythonAPI_ only works with 0.9.0 and future versions.

Sorry for the confusion, we are still trying to document all the changes while implementing the new API.

[jingzhao3200]

Ah ok, I see. _PythonClient_ no longer works with 0.9.0, we are in the middle of a transition to a new API.

_PythonClient_ only works with versions prior to 0.9.0, and _PythonAPI_ only works with 0.9.0 and future versions.

Sorry for the confusion, we are still trying to document all the changes while implementing the new API.

May I ask what is the difference between _PythonClient_ and _PythonAPI_?
I am trying to implement the elder version python code to the new version 0.9.2, but it cames this error:
ERROR: (localhost:2000) failed to read data: timed out

I have no clues about how to solve this problem.
Thanks!

[nsubiron]

Prior to 0.9.0 we used three ports, serialized with protobuf except sensor data, the server part of this was in _CarlaServer_ folder. The client-server protocol was very rigid and on any sort of failure it required to reset the current episode.

On the new version we switched to a dual model, rpc + streaming; the control messages are sent via rpc using rpclib while the sensor data is streamed with our own streaming library implementation in _LibCarla_. This model allow us to connect several clients simultaneously and be more robust towards connection errors, plus rpc is quite flexible for adding new messages. The client was then moved to _PythonAPI_ which is implemented in C++.

I'm afraid is nearly impossible to make both systems compatible.

[jingzhao3200]

Prior to 0.9.0 we used three ports, serialized with protobuf except sensor data, the server part of this was in _CarlaServer_ folder. The client-server protocol was very rigid and on any sort of failure it required to reset the current episode.

On the new version we switched to a dual model, rpc + streaming; the control messages are sent via rpc using rpclib while the sensor data is streamed with our own streaming library implementation in _LibCarla_. This model allow us to connect several clients simultaneously and be more robust towards connection errors, plus rpc is quite flexible for adding new messages. The client was then moved to _PythonAPI_ which is implemented in C++.

I'm afraid is nearly impossible to make both systems compatible.

Very helpful! Thanks a lot!

[hangxu124]

Hi, @nsubiron

when I try to run spawn_npc.py in Carla 0.9.1(and 0.9.3), I got error like this:
python spawn_npc.py -n 80 -p3222`

destroying 0 actors
done.
Traceback (most recent call last):
File "spawn_npc.py", line 122, in
main()
File "spawn_npc.py", line 68, in main
world = client.get_world()
RuntimeError: rpc::timeout: Timeout of 2000ms while connecting to 127.0.0.1:3222

I also try the default 2000 port, some other port which I choose randomly, and got the same error.

I try the command: sudo ufw status verbose and then open my port, however, the errors still exist.
`Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip

To Action From
-- ------ ----
2000 ALLOW IN Anywhere
2001 ALLOW IN Anywhere
2000/tcp ALLOW IN Anywhere
2001/tcp ALLOW IN Anywhere
2000 ALLOW IN 120.0.0.1
2001 ALLOW IN 120.0.0.1
2000 (v6) ALLOW IN Anywhere (v6)
2001 (v6) ALLOW IN Anywhere (v6)
2000/tcp (v6) ALLOW IN Anywhere (v6)
2001/tcp (v6) ALLOW IN Anywhere (v6)
`

Could you please help me about that?

[ydjian]

I have the same rpc:timeout issue.

I just follow the instructions to build carla 0.9.5 with Ubuntu 18.04.
On one terminal I ran make launch.
On other terminal I ran python spawn_npc.py and have the same error messages.

It seems that the server is not catching the requests. Is there any way to check whether the server is actually listening? I tried to use netstat -plnt, but port 2000 is not being listened.....

[Derekabc]

@ydjian have you solved this problem? Thank you

[ydjian]

Unfortunately nope

[frankyyzy]

I encountered the similar problem. I am using the mac fork of the carla version and was able to get the simulator working. I am able to scan 2000 and 2001 in my ports but in tutorial.py it just won't connect and timed out. Can someone please help?

[analog-cbarber]

It's hard to help without more information. Have you looked at the server log?

[frankyyzy]

I think the server log means that the port 127.0.0.1:2000 is listening and that's what tutorial.py is trying to connect to.
[2019.07.08-18.20.08:391][802]LogNet: GameNetDriver IpNetDriver_6 IpNetDriver listening on port 2000
[2019.07.08-18.20.08:408][802]LogCarla: Error: Can't find player controller!
[2019.07.08-18.20.08:408][802]LogCarlaServer: New episode 'UEDPIE_1_Town03' started
[2019.07.08-18.20.08:408][802]PIE: Play in editor start time for /Game/Carla/Maps/UEDPIE_1_Town03 1.372
[2019.07.08-18.20.08:409][802]LogCarla: == CARLA Settings ==============================================================
[2019.07.08-18.20.08:409][802]LogCarla: Last settings file loaded:
[2019.07.08-18.20.08:409][802]LogCarla: [CARLA/Server]
[2019.07.08-18.20.08:409][802]LogCarla: Networking = Disabled
[2019.07.08-18.20.08:409][802]LogCarla: World Port = 2000
[2019.07.08-18.20.08:409][802]LogCarla: Server Time-out = 10000 ms
[2019.07.08-18.20.08:409][802]LogCarla: Synchronous Mode = Disabled
[2019.07.08-18.20.08:409][802]LogCarla: Send Non-Player Agents Info = Disabled
[2019.07.08-18.20.08:409][802]LogCarla: Rendering = Enabled
[2019.07.08-18.20.08:409][802]LogCarla: [CARLA/LevelSettings]
[2019.07.08-18.20.08:409][802]LogCarla: Player Vehicle = Default
[2019.07.08-18.20.08:409][802]LogCarla: Number Of Vehicles = 5
[2019.07.08-18.20.08:409][802]LogCarla: Number Of Pedestrians = 15
[2019.07.08-18.20.08:409][802]LogCarla: Weather Id = -1
[2019.07.08-18.20.08:409][802]LogCarla: Seed Vehicle Spawner = 123456789
[2019.07.08-18.20.08:409][802]LogCarla: Seed Pedestrian Spawner = 123456789
[2019.07.08-18.20.08:409][802]LogCarla: Two-Wheeled Vehicles = Enabled
[2019.07.08-18.20.08:409][802]LogCarla: Found 0 available weather settings.
[2019.07.08-18.20.08:409][802]LogCarla: [CARLA/QualitySettings]
[2019.07.08-18.20.08:409][802]LogCarla: Quality Level = Epic
[2019.07.08-18.20.08:409][802]LogCarla: [CARLA/Sensor]
[2019.07.08-18.20.08:409][802]LogCarla: Semantic Segmentation = Enabled
[2019.07.08-18.20.08:409][802]LogCarla: ================================================================================
[2019.07.08-18.20.08:512][802]LogInit: FAudioDevice initialized.
[2019.07.08-18.20.08:670][802]LogSlate: Updating window title bar state: overlay mode, drag disabled, window buttons hidden, title bar hidden
[2019.07.08-18.20.08:960][802]LogNet: Browse: 127.0.0.1:2000//Game/Carla/Maps/Town03
[2019.07.08-18.20.08:960][802]LogTemp: Display: ParseSettings for GameNetDriver
[2019.07.08-18.20.08:960][802]LogTemp: Display: ParseSettings for IpNetDriver_7
[2019.07.08-18.20.08:960][802]LogTemp: Display: ParseSettings for PendingNetDriver
[2019.07.08-18.20.08:960][802]LogInit: BSD IPv4/6: Socket queue 32768 / 32768
[2019.07.08-18.20.08:963][802]PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent)
[2019.07.08-18.20.08:964][802]LogNet: Game client on port 2000, rate 10000
[2019.07.08-18.20.09:014][802]PIE: Play in editor start time for /Game/Carla/Maps/Town03 1.978
[2019.07.08-18.20.09:029][802]LogBlueprintUserMessages: Late PlayInEditor Detection: Level '/Game/Carla/Maps/Town03.Town03:PersistentLevel' has LevelScriptBlueprint '/Game/Carla/Maps/Town03.Town03:PersistentLevel.Town03' with GeneratedClass '/Game/Carla/Maps/Town03.Town03_C' with ClassGeneratedBy '/Game/Carla/Maps/Town03.Town03:PersistentLevel.Town03'
[2019.07.08-18.20.09:029][802]LogNet: NotifyAcceptingConnection accepted from: 127.0.0.1:57390
[2019.07.08-18.20.09:029][802]LogHandshake: SendConnectChallenge. Timestamp: 0.090009, Cookie: 244107226208217001080124033131105163199090226016241167159107
[2019.07.08-18.20.09:039][802]LogHandshake: SendChallengeResponse. Timestamp: 0.090009, Cookie: 244107226208217001080124033131105163199090226016241167159107
[2019.07.08-18.20.10:151][803]LogNet: NotifyAcceptingConnection accepted from: 127.0.0.1:57390
[2019.07.08-18.20.10:151][803]LogHandshake: SendChallengeAck. InCookie: 244107226208217001080124033131105163199090226016241167159107
[2019.07.08-18.20.10:151][803]LogNet: Server accepting post-challenge connection from: 127.0.0.1:57390
[2019.07.08-18.20.10:154][803]PacketHandlerLog: Loaded PacketHandler component: Engine.EngineHandlerComponentFactory (StatelessConnectHandlerComponent)
[2019.07.08-18.20.10:154][803]LogNet: NotifyAcceptedConnection: Name: Town03, TimeStamp: 07/08/19 11:20:10, [UNetConnection] RemoteAddr: 127.0.0.1:57390, Name: IpConnection_7, Driver: GameNetDriver IpNetDriver_6, IsServer: YES, PC: NULL, Owner: NULL, UniqueId: INVALID
[2019.07.08-18.20.10:154][803]LogNet: AddClientConnection: Added client connection: [UNetConnection] RemoteAddr: 127.0.0.1:57390, Name: IpConnection_7, Driver: GameNetDriver IpNetDriver_6, IsServer: YES, PC: NULL, Owner: NULL, UniqueId: INVALID
[2019.07.08-18.20.10:156][803]LogNet: UPendingNetGame::SendInitialJoin: Sending hello. [UNetConnection] RemoteAddr: 127.0.0.1:2000, Name: IpConnection_6, Driver: PendingNetDriver IpNetDriver_7, IsServer: NO, PC: NULL, Owner: NULL, UniqueId: INVALID
[2019.07.08-18.20.10:493][804]LogNet: NotifyAcceptingChannel Control 0 server World /Game/Carla/Maps/UEDPIE_1_Town03.Town03: Accepted
[2019.07.08-18.20.10:493][804]LogNet: Remote platform little endian=1
[2019.07.08-18.20.10:493][804]LogNet: This platform little endian=1
[2019.07.08-18.20.11:281][805]LogNet: Login request: /Game/Carla/Maps/Town03?Name=Franks-MBP-2-9717B6048F488D85206D82A27F657B84 userId: NULL:Franks-MBP-2-9717B6048F488D85206D82A27F657B84 platform: NULL
[2019.07.08-18.20.11:283][805]LogNet: Welcomed by server (Level: /Game/Carla/Maps/UEDPIE_1_Town03, Game: /Game/Carla/Blueprints/Game/TheNewCarlaGameMode.TheNewCarlaGameMode_C)
[2019.07.08-18.20.11:320][805]LogLoad: LoadMap: 127.0.0.1:2000//Game/Carla/Maps/UEDPIE_1_Town03?game=/Game/Carla/Blueprints/Game/TheNewCarlaGameMode.TheNewCarlaGameMode_C
[2019.07.08-18.20.13:163][805]LogMetal: Display: Got a bulk data texture, with 1 mips
[2019.07.08-18.20.13:163][805]LogMetal: Display: Got a bulk data texture, with 1 mips
[2019.07.08-18.20.13:164][805]LogMetal: Display: Got a bulk data texture, with 1 mips
[2019.07.08-18.20.13:164][805]LogAIModule: Creating AISystem for world Town03
[2019.07.08-18.20.13:166][805]LogTemp: Display: ParseSettings for GameNetDriver
[2019.07.08-18.20.13:399][805]LogWorld: Bringing World /Game/Carla/Maps/UEDPIE_2_Town03.Town03 up for play (max tick rate 3) at 2019.07.08-11.20.13
[2019.07.08-18.20.13:434][805]LogWorld: Bringing up level for play took: 0.261007
[2019.07.08-18.20.13:435][805]LogLoad: Took 2.114692 seconds to LoadMap(/Game/Carla/Maps/UEDPIE_1_Town03)
[2019.07.08-18.20.13:527][806]LogNet: Client netspeed is 10000
[2019.07.08-18.20.13:527][806]LogNet: Join request: /Game/Carla/Maps/Town03?Name=Franks-MBP-2-9717B6048F488D85206D82A27F657B84?SplitscreenCount=1
[2019.07.08-18.20.13:528][806]LogOnlineSession: Warning: OSS: No game present to join for session (GameSession)
[2019.07.08-18.20.13:540][806]LogNet: Join succeeded: Franks-MBP-2-9717B60
[2019.07.08-18.20.14:687][808]LogOnlineSession: Warning: OSS: No game present to join for session (GameSession)
[2019.07.08-18.20.28:378][ 31]LogSlate: FSceneViewport::OnFocusLost() reason 0

[gengtsh]

@ydjian have you solved this problem? Thank you

[smmmmi]

Still a problem in newer releases 0.9.9

[evdoks]

Also getting the same error in 0.9.9.4 when building from source (on MacOS though).

Still a problem in newer releases 0.9.9

@smmmmi Do you experience it on Ubuntu or MacOS?
I've managed to build Carla and PythonAPI on MacOS and the Carla is running, but Python examples cannot connect to the server and fail with the time-out.

I can start Unreal Editor with make launch (or make launch-only), then launch Carla from the editor. I can see, that the UE4Editor process is listening on ports 2000 and 2001. The versions of the server and client can be read and match:

import carla

client = carla.Client(host='127.0.0.1', port=2000)
server_version = client.get_server_version()
client_version = client.get_client_version()

However, executing an example (e.g., spawn_npc.py) or trying to load a city with client.load_world('Town03') results in a time-out:

    client.load_world('Town03')
RuntimeError: time-out of 60000ms while waiting for the simulator, 
make sure the simulator is ready and connected to 127.0.0.1:2000

[smmmmi]

Thanks for the follow up @evdoks I am however on Ubuntu 18 / Python 3.7, but with the same situation here that Carla is running but the examples time out.
I can however manage to run and spawn blueprints using the apt-get installation but I want it to be built from source to access some files which are not there (carla.client or client_example).