fixup! feat(coap): auto-start CoAP server as needed

src/ariel-os-coap/src/lib.rs

@@ -72,6 +72,14 @@ pub async fn coap_run(handler: impl coap_handler::Handler + coap_handler::Report
     coap_run_impl(handler).await
 }
 
+/// Workhorse of [`coap_run`], see there for details.
+///
+/// This is a separate function because if that function is not exposed publicly (i.e. when the
+/// laze feature `coap-server` is not active), it is called automatically in a separate task.
+///
+/// # Panics
+///
+/// This can only be run once, as it sets up a system wide CoAP handler.
 async fn coap_run_impl(handler: impl coap_handler::Handler + coap_handler::Reporting) -> ! {
     static COAP: StaticCell<embedded_nal_coap::CoAPShared<CONCURRENT_REQUESTS>> = StaticCell::new();