iox-cpp-publisher-helloworld print error code 2

[cloudjacky]

Required information

Operating system:
Ubuntu 18.04 LTS

Compiler version:
gcc version 7.5.0

Observed result or behaviour:
run program iox-cpp-publisher-helloworld in example icehello，
and print error information, as follows
"2022-11-09 13:33:28.445 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:28.198 [Warn ]: IPC channel still there, doing an unlink of iox-cpp-publisher-helloworld
2022-11-09 13:33:28.487 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:28.173 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:28.223 [Warn ]: RouDi not found - waiting ...
2022-11-09 13:33:28.713 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:28.420 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.703 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.219 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.469 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.461 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.961 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.905 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.599 [Error]: unable to create ipc channel with error code: 2
2022-11-09 13:33:29.819 [Error]: unable to create ipc channel with error code: 2
"

Expected result or behaviour:
The program can run normally，
and what does error code 2 means?
in the source code means POSH__RUNTIME_FACTORY_IS_NOT_SET?

Conditions where it occurred / Performed steps:
run program with cmd line:
./iox-cpp-publisher-helloworld

[cloudjacky]

run ./iox-roudi

[elfenpiff]

Hi @cloudjacky . It seems you solved the issue yourself?

Could you please tell us what the problem was - maybe the documentation of the hello world example was not specific enough or confusing in some parts. If this was the reason that you encountered this issue I would like to adjust the example so that others are not struggling with it as you did.

[cloudjacky]

@elfenpiff
yes，problem had solved
After reading the code, both publisher example and subscriber example communicate as the client of roudi deamon,
I didn't look at the document. I don't know if there is any introduction in the document

[stm32f303ret6]

how do you solve that problem?

[elBoberido]

@stm32f303ret6 I guess by starting iox-roudi. The important message is lost it the flood of error messages which should not be printed. This is the corresponding issue #1574 ... just in case you want to get your hands dirty ;)

[stm32f303ret6]

yes, now it works, thanks!