StatusBadEncodingLimitsExceeded on single read request about opcua

[magiconair]

Which gopcua version are you using?

Which data structure did you use for the Read response?

Regarding state: lets try to recreate the issue and then we can probably see where it breaks.

[dtq-two]

Which gopcua version are you using?

I was using version v0.3.5

Which data structure did you use for the Read response?

What do you mean? In version v0.3.5 the ReadWithContext returns (*ua.ReadResponse, error), but I'm unsure if this is what you meant.

[magiconair]

What do you mean? In version v0.3.5 the ReadWithContext returns (*ua.ReadResponse, error), but I'm unsure if this is what you meant.

I may have confused something here. So you're saying that you get that error just by reading node i=2269, correct?

Can you try this with the latest version v0.5.1?

cd ./examples/read
go run read.go -endpoint opc.tcp://<host:port> -node 'i=2269' -debug

[dtq-two]

That is correct and I upgraded to v0.5.1 with the same results.
This was the output from your suggestion:

% cd ./examples/read
% go run read.go -endpoint opc.tcp://<myhost:myport> -node 'i=2269' -debug
debug: uacp: connecting to opc.tcp://<myhost:myport>
debug: uacp 1: start HEL/ACK handshake
debug: uacp 1: sent HELF with 101 bytes
debug: uacp 1: recv ACKF with 28 bytes
debug: uacp 1: server has no chunk limit. Using 512
debug: uacp 1: recv &uacp.Acknowledge{Version:0x0, ReceiveBufSize:0xffff, SendBufSize:0xffff, MaxMessageSize:0x1000000, MaxChunkCount:0x200}
debug: uasc 1/1: send *ua.OpenSecureChannelRequest with 132 bytes
debug: uacp 1: recv OPNF with 135 bytes
debug: uasc 1/1: recv OPNF with 135 bytes
debug: uasc 1/1: recv *ua.OpenSecureChannelResponse
debug: uasc 1/1: sending *ua.OpenSecureChannelResponse to handler
debug: uasc 1: received security token. channelID=3407 tokenID=1 createdAt=2023-08-23T11:04:50Z lifetime=1h0m0s
debug: uasc 1/2: send *ua.CreateSessionRequest with 308 bytes
debug: uasc 1: security token is refreshed at 2023-08-23T11:49:50Z (45m0s). channelID=3407 tokenID=1
debug: uasc 1: security token expires at 2023-08-23T12:19:50Z. channelID=3407 tokenID=1
debug: uacp 1: recv MSGF with 14763 bytes
debug: uasc 1/2: recv MSGF with 14763 bytes
debug: uasc 1/2: recv *ua.CreateSessionResponse
debug: uasc 1/2: sending *ua.CreateSessionResponse to handler
debug: uasc 1/3: send *ua.ActivateSessionRequest with 156 bytes
debug: uacp 1: recv MSGF with 96 bytes
debug: uasc 1/3: recv MSGF with 96 bytes
debug: uasc 1/3: recv *ua.ActivateSessionResponse
debug: uasc 1/3: sending *ua.ActivateSessionResponse to handler
debug: uasc 1/4: send *ua.ReadRequest with 131 bytes
debug: client: monitor: start
debug: sub: pause
debug: uacp 1: recv MSGF with 299 bytes
debug: uasc 1/4: recv MSGF with 299 bytes
debug: uasc 1/4: recv *ua.ReadResponse
debug: uasc 1/4: sending *ua.ReadResponse to handler
debug: uasc 1/5: send *ua.ReadRequest with 128 bytes
debug: uacp 1: recv MSGF with 82 bytes
debug: uasc 1/5: recv MSGF with 82 bytes
debug: uasc 1/5: err: The message encoding/decoding limits imposed by the stack have been exceeded. StatusBadEncodingLimitsExceeded (0x80080000)
debug: uasc 1/5: sending <nil> to handler
Read failed: The message encoding/decoding limits imposed by the stack have been exceeded. StatusBadEncodingLimitsExceeded (0x80080000)
exit status 1

[magiconair]

OK, could you capture a tcpdump and attach this here? If you don't want to attach it here you can send it to me via Keybase.

[magiconair]

I'm having trouble accessing my Keybase account right now. I might be able to get to it later tonight.

[dtq-two]

OK, could you capture a tcpdump and attach this here? If you don't want to attach it here you can send it to me via Keybase.

13:36:24.439016 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [S], seq 3640104227, win 65535, options [mss 1460,nop,wscale 6,nop,nop,TS val 791976457 ecr 0,sackOK,eol], length 0
13:36:24.439541 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [S.], seq 3279600835, ack 3640104228, win 65535, options [mss 1460,nop,wscale 1,sackOK,TS val 42226121 ecr 791976457], length 0
13:36:24.439624 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 1, win 2058, options [nop,nop,TS val 791976457 ecr 42226121], length 0
13:36:24.439745 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [P.], seq 1:102, ack 1, win 2058, options [nop,nop,TS val 791976457 ecr 42226121], length 101
13:36:24.440260 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [P.], seq 1:29, ack 102, win 32717, options [nop,nop,TS val 42226121 ecr 791976457], length 28
13:36:24.440353 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 29, win 2058, options [nop,nop,TS val 791976458 ecr 42226121], length 0
13:36:24.440507 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [P.], seq 102:234, ack 29, win 2058, options [nop,nop,TS val 791976458 ecr 42226121], length 132
13:36:24.440992 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [P.], seq 29:164, ack 234, win 32651, options [nop,nop,TS val 42226121 ecr 791976458], length 135
13:36:24.441076 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 164, win 2056, options [nop,nop,TS val 791976458 ecr 42226121], length 0
13:36:24.441328 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [P.], seq 234:542, ack 164, win 2056, options [nop,nop,TS val 791976458 ecr 42226121], length 308
13:36:24.442739 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 164:1612, ack 542, win 32497, options [nop,nop,TS val 42226121 ecr 791976458], length 1448
13:36:24.442740 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 1612:3060, ack 542, win 32497, options [nop,nop,TS val 42226121 ecr 791976458], length 1448
13:36:24.442809 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 1612, win 2033, options [nop,nop,TS val 791976461 ecr 42226121], length 0
13:36:24.442812 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 3060, win 2011, options [nop,nop,TS val 791976461 ecr 42226121], length 0
13:36:24.443187 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 3060:4508, ack 542, win 32497, options [nop,nop,TS val 42226121 ecr 791976461], length 1448
13:36:24.443188 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 4508:5956, ack 542, win 32497, options [nop,nop,TS val 42226121 ecr 791976461], length 1448
13:36:24.443190 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 5956:7404, ack 542, win 32497, options [nop,nop,TS val 42226121 ecr 791976461], length 1448
13:36:24.443191 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 7404:8852, ack 542, win 32497, options [nop,nop,TS val 42226121 ecr 791976461], length 1448
13:36:24.443238 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 4508, win 2025, options [nop,nop,TS val 791976461 ecr 42226121], length 0
13:36:24.443240 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 5956, win 2002, options [nop,nop,TS val 791976461 ecr 42226121], length 0
13:36:24.443368 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 8852, win 2025, options [nop,nop,TS val 791976461 ecr 42226121], length 0
13:36:24.443589 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 8852:10300, ack 542, win 32497, options [nop,nop,TS val 42226122 ecr 791976461], length 1448
13:36:24.443595 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 10300:11748, ack 542, win 32497, options [nop,nop,TS val 42226122 ecr 791976461], length 1448
13:36:24.443597 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 11748:13196, ack 542, win 32497, options [nop,nop,TS val 42226122 ecr 791976461], length 1448
13:36:24.443601 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], seq 13196:14644, ack 542, win 32497, options [nop,nop,TS val 42226122 ecr 791976461], length 1448
13:36:24.443607 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [P.], seq 14644:14927, ack 542, win 32497, options [nop,nop,TS val 42226122 ecr 791976461], length 283
13:36:24.443672 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 10300, win 2025, options [nop,nop,TS val 791976461 ecr 42226122], length 0
13:36:24.443798 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 14927, win 2020, options [nop,nop,TS val 791976461 ecr 42226122], length 0
13:36:24.443922 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [P.], seq 542:698, ack 14927, win 2048, options [nop,nop,TS val 791976462 ecr 42226122], length 156
13:36:24.444363 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [P.], seq 14927:15023, ack 698, win 32419, options [nop,nop,TS val 42226122 ecr 791976462], length 96
13:36:24.444401 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 15023, win 2046, options [nop,nop,TS val 791976462 ecr 42226122], length 0
13:36:24.444539 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [P.], seq 698:829, ack 15023, win 2048, options [nop,nop,TS val 791976462 ecr 42226122], length 131
13:36:24.444819 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [P.], seq 15023:15322, ack 829, win 32354, options [nop,nop,TS val 42226122 ecr 791976462], length 299
13:36:24.444844 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 15322, win 2043, options [nop,nop,TS val 791976462 ecr 42226122], length 0
13:36:24.444963 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [P.], seq 829:957, ack 15322, win 2048, options [nop,nop,TS val 791976463 ecr 42226122], length 128
13:36:24.445189 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [P.], seq 15322:15404, ack 957, win 32290, options [nop,nop,TS val 42226122 ecr 791976463], length 82
13:36:24.445214 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 15404, win 2046, options [nop,nop,TS val 791976463 ecr 42226122], length 0
13:36:24.445608 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [F.], seq 957, ack 15404, win 2048, options [nop,nop,TS val 791976463 ecr 42226122], length 0
13:36:24.445822 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [.], ack 958, win 32290, options [nop,nop,TS val 42226122 ecr 791976463], length 0
13:36:24.445822 IP 10.10.20.11.4982 > 10.10.10.66.54401: Flags [F.], seq 15404, ack 958, win 32290, options [nop,nop,TS val 42226122 ecr 791976463], length 0
13:36:24.445883 IP 10.10.10.66.54401 > 10.10.20.11.4982: Flags [.], ack 15405, win 2048, options [nop,nop,TS val 791976463 ecr 42226122], length 0

[magiconair]

Thanks. Can you attach the file? I need to look at the content of the response to understand where it breaks.

[dtq-two]

Thanks. Can you attach the file? I need to look at the content of the response to understand where it breaks.

This zip contains the tcpdump pcap file:

read.pcap.zip