esp-idf/examples/protocols/coap_client/main/Kconfig.projbuild

menu "Example CoAP Client Configuration"

    config EXAMPLE_TARGET_DOMAIN_URI
        string "Target Uri"
        default "coaps://californium.eclipseprojects.io"
        help
            Target uri for the example to use. Use coaps:// prefix for encrypted traffic
            using Pre-Shared Key (PSK) or Public Key Infrastructure (PKI).

    config EXAMPLE_COAP_PSK_KEY
        string "Preshared Key (PSK) to used in the connection to the CoAP server"
        depends on COAP_MBEDTLS_PSK
        default "sesame"
        help
            The Preshared Key to use to encrypt the communicatons. The same key must be
            used at both ends of the CoAP connection, and the CoaP client must request
            an URI prefixed with coaps:// instead of coap:// for DTLS to be used.

    config EXAMPLE_COAP_PSK_IDENTITY
        string "PSK Client identity (username)"
        depends on COAP_MBEDTLS_PSK
        default "password"
        help
            The identity (or username) to use to identify to the CoAP server which
            PSK key to use.

endmenu