fix(coap): Address lints

src/riot-rs-coap/src/lib.rs

@@ -11,9 +11,8 @@
 // Moving work from https://github.com/embassy-rs/embassy/pull/2519 in here for the time being
 mod udp_nal;
 
-use coap_handler_implementations::{HandlerBuilder, ReportingHandlerBuilder};
+use coap_handler_implementations::ReportingHandlerBuilder;
 use coapcore::seccontext;
-use critical_section::Mutex;
 use embassy_net::udp::{PacketMetadata, UdpSocket};
 use riot_rs_debug::log::*;
 use static_cell::StaticCell;
@@ -46,7 +45,6 @@ pub async fn coap_run(
         &mut tx_meta,
         &mut tx_buffer,
     );
-    use embedded_nal_async::UnconnectedUdp;
 
     info!("Starting up CoAP server");
 

src/riot-rs-coap/src/udp_nal/mod.rs

@@ -25,6 +25,10 @@ mod util;
 pub use util::Error;
 use util::{is_unspec_ip, sockaddr_nal2smol, sockaddr_smol2nal};
 
+#[expect(
+    dead_code,
+    reason = "pub item is being prepared for embedded-nal-async where it will be reachable publicly"
+)]
 pub struct ConnectedUdp<'a> {
     remote: IpEndpoint,
     // The local port is stored in the socket, as it gets bound. This value is populated lazily:
@@ -50,6 +54,10 @@ impl<'a> ConnectedUdp<'a> {
     ///
     /// The `socket` must be open (in the sense of smoltcp's `.is_open()`) -- unbound and
     /// unconnected.
+    #[expect(
+        dead_code,
+        reason = "pub item is being prepared for embedded-nal-async where it will be reachable publicly"
+    )]
     pub async fn connect_from(
         mut socket: udp::UdpSocket<'a>,
         local: nal::SocketAddr,
@@ -74,6 +82,10 @@ impl<'a> ConnectedUdp<'a> {
     ///
     /// The `socket` must be open (in the sense of smoltcp's `.is_open()`) -- unbound and
     /// unconnected.
+    #[expect(
+        dead_code,
+        reason = "pub item is being prepared for embedded-nal-async where it will be reachable publicly"
+    )]
     pub async fn connect(socket: udp::UdpSocket<'a>, /*, ... */) -> Result<Self, udp::BindError> {
         // This is really just a copy of the provided `embedded_nal::udp::UdpStack::connect` method
         todo!("use {:p}", &socket)

src/riot-rs-coap/src/udp_nal/util.rs

@@ -64,6 +64,7 @@ pub enum Error {
     BindError(udp::BindError),
     /// Error stemming from failure to represent the given address family for lack of enabled
     /// embassy-net features
+    #[expect(dead_code, reason = "feature selection currently disabled")]
     AddressFamilyUnavailable,
 }