Sending commands in a short interval leads to Errors in signing

[anp369]

I've got a few lights communicating via mysensors.
When activiating multiple lights via a scene from homeassistant, it fails to set all lights correctly.
The lights have soft signing enabled. I'm using the Serial Gateway with 115200 bd.

Log from homeassistant:

2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.transport] Sending 6;0;1;1;41;ffff60b8                                                                                                                           
2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.transport] Sending 7;0;1;1;2;1                                                                                                                                   
2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.transport] Sending 7;0;1;1;3;89
2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.transport] Sending 7;0;1;1;41;ffff00d6
2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736274 TSF:MSG:SEND,0-0-6-6,s=0,c=3,t=16,pt=0,l=0,sg=1,ft=0,st=OK:
2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736274 TSF:MSG:SEND,0-0-6-6,s=0,c=3,t=16,pt=0,l=0,sg=1,ft=0,st=OK:
2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736282 !MCO:PRO:RC=1
2021-11-08 18:56:31 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736282 !MCO:PRO:RC=1
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736321 !TSF:MSG:SEND,0-0-7-7,s=0,c=3,t=16,pt=0,l=0,sg=0,ft=0,st=NACK:
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736321 !TSF:MSG:SEND,0-0-7-7,s=0,c=3,t=16,pt=0,l=0,sg=0,ft=0,st=NACK:
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736328 !TSF:MSG:SIGN FAIL
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736328 !TSF:MSG:SIGN FAIL
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736332 TSF:MSG:READ,6-6-0,s=255,c=3,t=17,pt=6,l=25,sg=0:<NONCE>
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736332 TSF:MSG:READ,6-6-0,s=255,c=3,t=17,pt=6,l=25,sg=0:<NONCE>
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736339 !MCO:PRO:RC=1
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736339 !MCO:PRO:RC=1
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736378 !TSF:MSG:SEND,0-0-7-7,s=0,c=3,t=16,pt=0,l=0,sg=0,ft=0,st=NACK:
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736378 !TSF:MSG:SEND,0-0-7-7,s=0,c=3,t=16,pt=0,l=0,sg=0,ft=0,st=NACK:
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736385 !TSF:MSG:SIGN FAIL
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736385 !TSF:MSG:SIGN FAIL
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736389 !MCO:PRO:RC=1
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736389 !MCO:PRO:RC=1
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736428 !TSF:MSG:SEND,0-0-7-7,s=0,c=3,t=16,pt=0,l=0,sg=0,ft=0,st=NACK:
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736428 !TSF:MSG:SEND,0-0-7-7,s=0,c=3,t=16,pt=0,l=0,sg=0,ft=0,st=NACK:
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736435 !TSF:MSG:SIGN FAIL
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736435 !TSF:MSG:SIGN FAIL
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736439 !MCO:PRO:RC=1
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107736439 !MCO:PRO:RC=1
2021-11-08 18:56:32 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107736442 !MCO:PRO:RC=1

...
2021-11-08 18:56:36 DEBUG (MainThread) [mysensors.transport] Receiving 0;255;3;0;9;1107741282 !TSF:MSG:SIGN FAIL                                                                                                  
2021-11-08 18:56:36 DEBUG (MainThread) [mysensors.handler] n:0 c:255 t:3 s:9 p:1107741282 !TSF:MSG:SIGN FAIL

The ... in the logs respresent a lot of RC=1 messages (maybe around 50).
Because of that the lights fail to be set properly. Is this a known bug or anything I could do about?
I'm happy to help with further sketches and debug logs if required.

I also opened an homeassistant issue.

[fallberg]

Possible duplicate of #1458

[anp369]

That's what I suspect as well. Since there wasn't much activity in the other issue I thought I open a new one since it's not confirmed to be the same issue. Do you have any idea how to tackle this problem?
I tried looking through the source code but I'm not familiar with the frameworks and the architecture of the code, so it's rather hard to understand all the macros and generalized things

[fallberg]

Sorry, but I am in a place in life right now where I do not have the bandwidth for mysensors. I believe the root cause is a recursive call in the signing backend.

[anp369]

Do you know if any of the other more active maintainers is still working on the project? It seems quite silent in the last few months? Do you have any kind of documentation for starting developing and debugging?

[fallberg]

Sorry, but I don't. I am probably the one who is most familiar with the security backend as I wrote most of it but with small kids there is simply not room for me to dive into the code for me right now. I have not poked around in it in the last 6 or 7 years or so.
You could try to reach out on the forum and see if there is someone more active who is familiar enough with the library to look into a solution.

[anp369]

I see. Thanks for your answer though. Is there any general documentation which kind of architecture you used for developing this framework? Since I have a little bit of experience in programming C++, I'm looking for some way to understand the structure, you used when creating so I might have an starting point digging into the code