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    Serial Datasource seems to timeout...

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    • MattFoxM
      MattFox
      last edited by

      I've got virtual ports running and talking via the serial datasource. All worked fine until the upgrade to 3.4.5.
      Every once in a while (and we are talking as little as a few days) data stops coming through. Hardware is absolutely fine. Data is still sending, but Mango doesn't store at all...
      Have to disable and re-enable the datasource for it to accept incoming data again..,
      Any thoughts on how to prevent this would be hugely appreciated

      Fox

      Do not follow where the path may lead; go instead where there is no path.
      And leave a trail - Muriel Strode

      1 Reply Last reply Reply Quote 0
      • phildunlapP
        phildunlap
        last edited by

        Hi Fox,

        You are using a virtual serial server socket connected to a serial data source, yes?

        It is very possible there is a lingering issue with the server socket, but that code hasn't changed much.

        Offhand, I wonder what buffer size you have, and would you ever expect message bursts to be more than that buffer size?

        I will try to look into this tomorrow, but if you could confirm / provide those details it may help.

        You may also be able to get more information for us by,

        1. When it is happening, does a nc -w 10 host port timeout to the virtual serial server socket?
        2. When it is happening, grab a thread dump from /rest/v1/threads?asFile=true&stackDepth=40
        3. Does it unstick if you run (or just validate) this in a JavaScript console:
        com.serotonin.m2m2.Common.runtimeManager.getRunningDataSoure("DS_XID").serialEvent(
    new com.infiniteautomation.serial.rt.SerialDataSourceRT.TimeoutSerialEvent(new Date().getTime())
);

        ?

        1 Reply Last reply Reply Quote 0
        • MattFoxM
          MattFox
          last edited by MattFox

          Oh shoot, it's not just the virtual, this one I've had the latest error was connecting to the supplied /dev/ttymUSB1

          Your thread dump:

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          Sorry dont have file upload permissions...

          @phildunlap said in Serial Datasource seems to timeout...:

          Does it unstick if you run (or just validate) this in a JavaScript console:

          com.serotonin.m2m2.Common.runtimeManager.getRunningDataSoure("DS_XID").serialEvent(
          new com.infiniteautomation.serial.rt.SerialDataSourceRT.TimeoutSerialEvent(new Date().getTime())
          );

          Is the DS_XID supposed to ba particular XID (I presume the serial ds xid is what you are referring to...) and is the chrome developer console sufficient? In the dev console all I got was undefined variable com
          0_1537829182360_0757103b-983f-49b5-b053-cafa969a1b68-image.png

          Do not follow where the path may lead; go instead where there is no path.
          And leave a trail - Muriel Strode

          MattFoxM 1 Reply Last reply Reply Quote 0
          • MattFoxM
            MattFox @MattFox
            last edited by 

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            Do not follow where the path may lead; go instead where there is no path.
            And leave a trail - Muriel Strode

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            • MattFoxM
              MattFox
              last edited by 

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              Do not follow where the path may lead; go instead where there is no path.
              And leave a trail - Muriel Strode

              1 Reply Last reply Reply Quote 0
              • phildunlapP
                phildunlap
                last edited by

                Is the DS_XID supposed to ba particular XID (I presume the serial ds xid is what you are referring to...) and is the chrome developer console sufficient? In the dev console all I got was undefined variable com

                It was supposed to be the data source XID of your serial data source. It was also to be run in a Mango JavaScript context. I probably shouldn't have said JavaScript console, that's not really what those are. Mango could use a JavaScript console...

                Oh shoot, it's not just the virtual, this one I've had the latest error was connecting to the supplied /dev/ttymUSB1

                My advisements were definitely for a virtual port! Although, you could try logging I/O and running that code in a Mango JavaScript context, still. The thread dump (which you could have emailed to support@infiniteautomation.com and I would have parsed the JSON using this script to look for either stuck threads or threads that were running for a very long time: https://github.com/infiniteautomation/ma-devtools/blob/master/PythonUtilities/Administration/parseThreads.py

                As it is though, with a real serial port, the thread dump isn't going to help us, it wouldn't seem. The handling of the serial port would be done in native code by the JSSC library and it would just hand events into Java. That would lead me to wonder if the connection with the serial device is spotty. You could check that by seeing if the port is getting re-enumerated or disconnecting by checking the dmesg output over SSH for the USB registration events. I would also wonder if the converter itself didn't have the issue, since we would be talking about a USB to 485 converter, or something, right?

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                • MattFoxM
                  MattFox @phildunlap
                  last edited by

                  @phildunlap said in Serial Datasource seems to timeout...:

                  My advisements were definitely for a virtual port!

                  Sorry about that Phil...

                  @phildunlap said in Serial Datasource seems to timeout...:

                  I would also wonder if the converter itself didn't have the issue, since we would be talking about a USB to 485 converter, or something, right?

                  Yes a RS232 but it's the same chip we've be using it for quite some time. It's only recently with the newer versions of mango we've been having these issues with the serial still being connected, but the data doesn't enter the datasource. Disabling and re-enabling it fixes the issue...

                  @phildunlap said in Serial Datasource seems to timeout...:

                  You could check that by seeing if the port is getting re-enumerated or disconnecting by checking the dmesg output over SSH for the USB registration events.

                  Thanks I'll give it a go and will see what I can find.

                  Fox

                  Do not follow where the path may lead; go instead where there is no path.
                  And leave a trail - Muriel Strode

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                  • phildunlapP
                    phildunlap
                    last edited by

                    Yes a RS232 but it's the same chip we've be using it for quite some time. It's only recently with the newer versions of mango we've been having these issues with the serial still being connected, but the data doesn't enter the datasource. Disabling and re-enabling it fixes the issue...

                    So you are experiencing the same issue on multiple MangoES units all using the same USB-232 converter? Hmm...

                    Offhand I can't really recall anything changing that should have affected that, but once again I'll have to say I'll look into it tomorrow (at least I'll be cogitating on the right thing this time!). What version are you upgrading these from? 3.3.4 ? The last change i'm aware of was in 3.3.3 to attempt to open ports even if unknown to the serial port manager. Other than that nothing would have changed AFAIK in quite a long while.

                    Disabling and re-enabling it fixes the issue...

                    The timeout event may help unstick it, but I suspect the port is getting reconnected, so I'll be curious to see the result of checking the dmesg log for one experiencing the issue.

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                    • MattFoxM
                      MattFox @phildunlap
                      last edited by

                      @phildunlap said in Serial Datasource seems to timeout...:

                      What version are you upgrading these from?

                      Some of these were in the early 3.3's to 3.4.5 so I'm running the latest mango software. I'll email the dmesg output stuff for you. Hmm looks like it's being tossed around... but that's my opinion.

                      Do not follow where the path may lead; go instead where there is no path.
                      And leave a trail - Muriel Strode

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                      • phildunlapP
                        phildunlap
                        last edited by

                        We'll see! Knowing that it's an ES (and assuming it's a V3 ES) and a real port brings to mind that the USB port directly adjacent to the ethernet port is on the base board, while the other USB port (beside the RS485 port) is on the daughter board and has a jumper board to the base board. That jumper board has caused issues before by being too loose, which could definitely result in the port getting disconnected momentarily and then rediscovered by the OS. I can tell by the symlink, ttymUSB1, that you are connected through the jumper board.

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                        • phildunlapP
                          phildunlap
                          last edited by phildunlap

                          Upon a screenshare with Fox, we discovered there were \n and null characters in the incoming bytes that were not being matched and consumed by the serial data source, which caused the data source to seize up when these characters started clogging the buffer. A combination of rewriting the regex and preventing the nulls from transmitting brought this issue resolution!

                          Edit: A similar issue happened again after I proclaimed resolution. This led me to a concurrency bug in the virtual serial server socket.

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