server write operation , response COAP_400_BAD_REQUEST

[nanioo]

when I start the server and client, i command like "exec 0 /1" 、"write 0 /1" and so on, there is no OK response, but 400, why this response

exec 0 /1
Error: 4.00 (COAP_400_BAD_REQUEST)

[nanioo]

write 0 /1/0/1 20
OK

Client #0 /1/0/1 : 5.03 (COAP_503_SERVICE_UNAVAILABLE)
non block transfer
0 bytes received of type text/plain:

and like this

[mlasch]

Hi @nanioo

when I start the server and client, i command like "exec 0 /1" 、"write 0 /1" and so on, there is no OK response, but 400, why this response

Error 4.00 makes sense here, because you try to exec on object instead of resource level. Try a resource which has the executable flag, e.g. exec 0 /1/0/8.

write 0 /1/0/1 20 works for me:

> write 0 /1/0/1 20
OK
> 8 bytes received from [::1]:56830
64 44 7C 45  45 7C C1 86   dD|EE|..

Client #0 /1/0/1 : 2.04 (COAP_204_CHANGED)
    non block transfer
    0 bytes received of type text/plain:

Are you using the Wakaama client and Wakaama server?