Provided by: libcoap2-bin_4.2.1-1build1_amd64 bug


       coap-server - CoAP Server based on libcoap


       coap-server [-d max] [-g group] [-l loss] [-p port] [-v num] [-A address] [-N] [[-k key]
       [-h hint]] [[-c certfile] [-n] [-C cafile] [-R root_cafile]]


       coap-server is an example server for the 'Constrained Application Protocol` (RFC 7252).


       -d max
           Enable support for creation of dynamic resources when doing a PUT up to a limit of
           max. If max is reached, a 4.06 code is returned until one of the dynamic resources has
           been deleted.

       -g group
           Join specified multicast group on startup.

       -p port
           The port on the given address will be listening for incoming connections. If (D)TLS is
           supported, then port + 1 will also be listened on for (D)TLS connections. The default
           port is 5683 if not given any other value.

       -l list
           Fail to send some datagrams specified by a comma separated list of numbers or number
           ranges (debugging only).

       -l loss%
           Randomly failed to send datagams with the specified probability - 100% all datagrams,
           0% no datagrams (debugging only).

       -v num
           The verbosity level to use (default 3, maximum is 9). Above 7, there is increased
           verbosity in GnuTLS and OpenSSL logging.

       -A addr
           The local address of the interface which the server has to listen.

           Send NON-confirmable message for \"observe\" responses. If option -N is not specified,
           a confirmable response will be sent. Even if set, every fifth response will still be
           sent as a confirmable response (RFC 7641 requirement).


       (If supported by underlying (D)TLS library)

       -h hint
           Pre-shared key hint to use for inbound connections. The default is CoAP. This cannot
           be empty if defined.

       -k key
           Pre-shared key to use for inbound connections. This cannot be empty if defined.  Note:
           if -c cafile is defined, you need to define -k key as well to have the server support
           both PSK and PKI.


       (If supported by underlying (D)TLS library)

       -c certfile
           Use the specified PEM file which contains the CERTIFICATE and PRIVATE KEY information.
           Note: if -k key is defined, you need to define -c cafile as well to have the server
           support both PSK and PKI.

           Disable the requirement for clients to have defined client certificates

       -C cafile
           PEM file containing the CA Certificate that was used to sign the certfile defined
           using -c certfile. If defined, then the client will be given this CA Certificate
           during the TLS set up. Furthermore, this will trigger the validation of the client
           certificate. If certfile is self-signed (as defined by -c certfile), then you need to
           have on the command line the same filename for both the certfile and cafile (as in -c
           certfile -C certfile) to trigger validation.

       -R root_cafile
           PEM file containing the set of trusted root CAs that are to be used to validate the
           server certificate. The -C cafile does not have to be in this list and is "trusted"
           for the verification. Alternatively, this can point to a directory containing a set of
           CA PEM files.


       •   Example

           coap-server -A ::1

       Let the server listen on localhost (port 5683).

       •   Example

           coap-server -A ::1 -k mysecretKey -h myhint

       Let the server listen on localhost (port 5683 and 5684) with the server set up for PSK

       •   Example

           coap-server -A ::1 -p 13011

       The same, except the listening port is 13011 (and not the default port 5683).

       •   Example

           coap-server -A 2001:db8:81a8:0:6ef0:dead:feed:beef -v 5

       The listening address is set to 2001:db8:81a8:0:6ef0:dead:feed:beef and the verbosity
       level is set to 5.

       •   Example

           coap-server -A 2001:db8:81a8:0:6ef0:dead:feed:beef -g FF02::FD

       Set listening address to 2001:db8:81a8:0:6ef0:dead:feed:beef and join the All CoAP Nodes
       multicast group FF02::FD.


       There are no configuration files.



           Failure (syntax or usage error; configuration error; document processing failure;
           unexpected error)


       Please report bugs on the mailing list for libcoap:


       The libcoap project <>