"CoAP context configuration error: attempted to set encryption context while one has already been configured for this encryption variant"
/// URI does not have a valid scheme for libcoap (coap, coaps, coap+tcp, coaps+tcp, http, https).
/// A critical option (as defined in [RFC 7252](https://datatracker.ietf.org/doc/html/rfc7252#section-5.4.1)