UDP problem with simhub and AMS2

[Lizard77]

Helo friends, I have a problem with Simhub and AMS2. When I drive offline everything works fine (bass-shaker, geardisplay and revlights). When I drive multiplayer, Simhub doesn't work anymore. Simtools continues to work. System settings in AMS2=(Projectcars2/ 1 / Projectcars2). Simhub settings= UDP experimental. I would be very grateful for a proposed solution.

 

[Lizard77]

It works. It was the setting in Simhub (telemetry default)

 

[BertramRaven]

Advice for anyone using SimHub/CrewChief or any other tool which wishes to link to AMS2:
Unless the tool you are using only supports UDP telemetry (for example it runs on a secondary machine) you should use Project Cars 2 shared memory and disable UDP.
If you do need to use UDP, ensure it is in Project Cars 2 mode and select 9 for the rate.
If everything is okay, you can reduce the rate to 8, then 7 etc.
The number sets how often the telemetry is broadcast. 1 = every physics frame, 2 = every second physics frame, 3 = every third physics frame. etc.
Even if your PC is a hand built monster from 8-Pack, unless you have something better than the on-board network ports, keep the value to five or higher. Note: just because your network card is rated for 10Gbe or higher, it does not automatically follow your card can keep up with a barrage of UDP packets. It is possible for an old 100Mb low-latency server network card to outperform that snazzy new 10Gbe card when it comes to rapid context changes.
If you do have to run UDP, install the tool which needs it on another PC. Having the driver on a single PC deal with both UDP broadcast and the tool which is filtering the UDP packets will put a huge drain on CPU resources unless the network card itself is a very expensive server level card.
Buy using two separate PC's (one for the game and another for the telemetry tool) most machines should handle AMS2 UDP rates of 4,3, or 2.
1 may still present an issue.
To be clear, most professional telemetry tools work no faster than 10Hz - even 9 on AMS2 UDP goes faster than that! You will rarely need anything faster.

 

[New York]

Advice for anyone using SimHub/CrewChief or any other tool which wishes to link to AMS2:
Unless the tool you are using only supports UDP telemetry (for example it runs on a secondary machine) you should use Project Cars 2 shared memory and disable UDP.
If you do need to use UDP, ensure it is in Project Cars 2 mode and select 9 for the rate.
If everything is okay, you can reduce the rate to 8, then 7 etc.
The number sets how often the telemetry is broadcast. 1 = every physics frame, 2 = every second physics frame, 3 = every third physics frame. etc.
Even if your PC is a hand built monster from 8-Pack, unless you have something better than the on-board network ports, keep the value to five or higher. Note: just because your network card is rated for 10Gbe or higher, it does not automatically follow your card can keep up with a barrage of UDP packets. It is possible for an old 100Mb low-latency server network card to outperform that snazzy new 10Gbe card when it comes to rapid context changes.
If you do have to run UDP, install the tool which needs it on another PC. Having the driver on a single PC deal with both UDP broadcast and the tool which is filtering the UDP packets will put a huge drain on CPU resources unless the network card itself is a very expensive server level card.
Buy using two separate PC's (one for the game and another for the telemetry tool) most machines should handle AMS2 UDP rates of 4,3, or 2.
1 may still present an issue.
To be clear, most professional telemetry tools work no faster than 10Hz - even 9 on AMS2 UDP goes faster than that! You will rarely need anything faster.

Are there any recommended settings by Reiza for these parameters?

 

[BertramRaven]

Are there any recommended settings by Reiza for these parameters?

I cannot find any specific advice directly from Reiza.
The community posts are worded similar to "start with a value of 9 (every ninth physics frame/tick) and reduce it to a level which still works without bogging down the PC in multiplayer due to device driver/hardware ability."

This matches the sentiment of posts on forums around other ME based games.

Other sims have the same issues and will need tuning according to their own methods for sending UDP telemetry, but as this is about AMS2 I will not go into the settings for other games.

If you are streaming and using UDP telemetry and in multiplayer, you may have something of a rough time with values less than five in PC2/AMS2. The larger the multiplayer field, the worse potential problem. It is important to emphasise this is not a problem specific to AMS2/PC2/Madness Engine. It is also important to realise this is not the same issue as that which some are reporting around the AMS2 server being "a bit s**t." (Actually, I find the AMS2 server will not run on low spec AWS virtual servers - LFM appear to have started these comments, with rf2 players gleefully chiming in, but so far they have never explained them.)


Advice: If you a streaming from the same machine the sim is running, don't try to collect telemetry over UDP. If you absolutely must as if your life depended on it, get a separate streamer PC. ($$$)

 

[DC WOLF]

SimHub supports shared memory, so there is no need for net noising UDP broadcast
Turn UDP (0) off and set SimHub to default.

 

[leffty]

My position is 5 ( from 11 ) when I start
But it shows 5 / 1
Shouldn't be 5 / 11 ? There are 11 players, me included.
I'm a bit confused. Everything else is correct on the display, but not the opponents nr
Some settings inside the SimHub ??
I use an Android tablet, SimHub latest version on PC, tried with Chrome browser, on Android.
No luck
Could anyone help, please ?

 

[BertramRaven]

My position is 5 ( from 11 ) when I start
But it shows 5 / 1
Shouldn't be 5 / 11 ? There are 11 players, me included.
I'm a bit confused. Everything else is correct on the display, but not the opponents nr
Some settings inside the SimHub ??
I use an Android tablet, SimHub latest version on PC, tried with Chrome browser, on Android.
No luck
Could anyone help, please ?

Use shared memory for SimHub and disable UDP.

 

[General_RIMT]

I am currently facing the opposite issue. In single player, shared memory works, but in multiplayer, does not for SIM hub. It works fine for fanalab and crew chief plugin though.

Update, current build is causing the issues, according to their github. It will be fixed for their next release. https://github.com/SHWotever/SimHub/issues/1433

 

[gdude66]

I am currently facing the opposite issue. In single player, shared memory works, but in multiplayer, does not for SIM hub. It works fine for fanalab and crew chief plugin though.

Update, current build is causing the issues, according to their github. It will be fixed for their next release. https://github.com/SHWotever/SimHub/issues/1433

Installed latest version 9.1.5 and that fixed the problem. I think 9.1.3 onwards resolves the issue.
Just do a download of the latest update and install.

 

[Rednose58]

I am using SimHub / AMS2 with shared memory all the time and no issues. There are however a strange "bug?" If I do a race (single player) and I watch the replay after the cool down lap, before I quit to the Main Menu - I can run my SimHub dashes showing timing data, track maps and some basic data. Enough information to create a replay video with useful information on the screen. If I save the replay, quit to the main menu and start the replay from there, there is no telemetry data available. I don't want to reconfigure SimHub, AMS2 and my network to handle UDP protocols. I'm not technically inclined enough. What can I do? Should we ask Reiza to do something about it?

 

[penam]

Hi, this tool is brilliant!

I have a question/problem though. I'm relaying data from AMS2 to mac with Shmem exe. When I do a race with one opponent (to practice analyzing data), I get all the data from my car, but only speed from opponents car (and some other data), but not braking and throttle. Should I be able to receive other data too? Or does AMS2 not give any other data from the AI car other than speed? The opponent csv file really has zeroes on throttle, brake etc.

 

[RickSwanRacing]

So get this.. i am glad I found this post. Tuesday I ran AMS2 with no issues. Last night made a change to SIMhub and AMS to get the telemetry across.. including the MOZA app. Bam… every time i launched an offline race my WiFi network completely crashed. Again tonight EXACT same issue. Even overwhelmed it so bad that my hardwired PC lost internet. Tested a theory that Simhub and the game were literally overwhelming the network to the point of failure and it was. Note this is a brand new fiber internet setup and brand new WiFi modem. But yeh.. that is some crazy @#$%. I mean… if i see this correctly… the game was attempting to interact with every device in my network? It kept knocking out my security cameras and our smart plugs. This is insane… and dangerous. In fact im almost certain that it impacted my cell phone that was on the network as I watched the battery level drop rapidly. Maybe im crazy but i can imagine if the app was attempting to interact with any device on the network… that’s a problem. I now need to figure out what i had the settings at on Tuesday when i streamed an offline race to my channel. I am hoping a previous answer of UDP no, and Simhub default works…