hid write and read immediatelly , return fail even set timeout =2000 ?

[myxiaonia]

i self-defined a host-client protocol over usb hid, found the issue describled in title.
if i insert a delay between write and read, it works well.
Is there any other method but delay that could boost the communication?

[myxiaonia]

[Youw]

how do you identify there is an error? hid_read returns < 0?
what is the value of hid_error when the error occures?

[myxiaonia]

read timeout and hid_read returns =0

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在 2026年3月16日，06:14，Ihor Dutchak ***@***.***> 写道： hid_read returns < 0