Have a callback for the pairing pin / display code

bleps-dedup/src/lib.rs

@@ -1,4 +1,4 @@
-use proc_macro::TokenStream;
+use proc_macro::{Delimiter, TokenStream};
 use proc_macro_error::proc_macro_error;
 
 #[derive(Debug)]
@@ -40,7 +40,7 @@ pub fn dedup(input: TokenStream) -> TokenStream {
                     current.extend([tok]);
                 }
             },
-            proc_macro::TokenTree::Group(_group) => {
+            proc_macro::TokenTree::Group(group) if group.delimiter() == Delimiter::Brace => {
                 if !current.is_empty() {
                     impls.push(Implementation {
                         is_async: impl_is_async,

bleps/src/async_attribute_server.rs

@@ -31,6 +31,9 @@ where
     #[cfg(feature = "crypto")]
     pub(crate) security_manager: AsyncSecurityManager<'a, Ble<T>, R>,
 
+    #[cfg(feature = "crypto")]
+    pub(crate) pin_callback: Option<&'a mut dyn FnMut(u32)>,
+
     #[cfg(not(feature = "crypto"))]
     phantom: PhantomData<R>,
 }
@@ -39,6 +42,9 @@ impl<'a, T, R: CryptoRng + RngCore> AttributeServer<'a, T, R>
 where
     T: embedded_io_async::Read + embedded_io_async::Write,
 {
+    /// Create a new instance of the AttributeServer
+    ///
+    /// When _NOT_ using the `crypto` feature you can pass a mutual reference to `bleps::no_rng::NoRng`
     pub fn new(
         ble: &'a mut Ble<T>,
         attributes: &'a mut [Attribute<'a>],
@@ -93,6 +99,9 @@ where
             #[cfg(feature = "crypto")]
             security_manager,
 
+            #[cfg(feature = "crypto")]
+            pin_callback: None,
+
             #[cfg(not(feature = "crypto"))]
             phantom: PhantomData::default(),
         }

bleps/src/attribute_server.rs

@@ -74,6 +74,9 @@ pub struct AttributeServer<'a, R: CryptoRng + RngCore> {
     #[cfg(feature = "crypto")]
     security_manager: SecurityManager<'a, Ble<'a>, R>,
 
+    #[cfg(feature = "crypto")]
+    pub(crate) pin_callback: Option<&'a mut dyn FnMut(u32)>,
+
     #[cfg(not(feature = "crypto"))]
     phantom: PhantomData<R>,
 }
@@ -195,7 +198,7 @@ bleps_dedup::dedup! {
                             // handle SM
                             #[cfg(feature = "crypto")]
                             self.security_manager
-                                .handle(self.ble, src_handle, l2cap_packet.payload).await?;
+                                .handle(self.ble, src_handle, l2cap_packet.payload, &mut self.pin_callback).await?;
                             Ok(WorkResult::DidWork)
                         } else {
                         let packet = Att::decode(l2cap_packet)?;
@@ -563,6 +566,9 @@ bleps_dedup::dedup! {
 }
 
 impl<'a, R: CryptoRng + RngCore> AttributeServer<'a, R> {
+    /// Create a new instance of the AttributeServer
+    ///
+    /// When _NOT_ using the `crypto` feature you can pass a mutual reference to `bleps::no_rng::NoRng`
     pub fn new(
         ble: &'a mut Ble<'a>,
         attributes: &'a mut [Attribute<'a>],
@@ -616,6 +622,8 @@ impl<'a, R: CryptoRng + RngCore> AttributeServer<'a, R> {
 
             #[cfg(feature = "crypto")]
             security_manager,
+            #[cfg(feature = "crypto")]
+            pin_callback: None,
 
             #[cfg(not(feature = "crypto"))]
             phantom: PhantomData::default(),
@@ -630,6 +638,11 @@ impl<'a, R: CryptoRng + RngCore> AttributeServer<'a, R> {
         #[cfg(not(feature = "crypto"))]
         None
     }
+
+    #[cfg(feature = "crypto")]
+    pub fn set_pin_callback(&mut self, pin_callback: Option<&'a mut dyn FnMut(u32)>) {
+        self.pin_callback = pin_callback;
+    }
 }
 
 #[derive(Debug)]

bleps/src/l2cap.rs

@@ -15,7 +15,7 @@ pub enum L2capDecodeError {
 impl L2capPacket {
     pub fn decode(packet: AclPacket) -> Result<(u16, Self), L2capDecodeError> {
         let data = packet.data.as_slice();
-        log::info!("{:02x?}", data);
+        log::debug!("L2CAP {:02x?}", data);
         let length = (data[0] as u16) + ((data[1] as u16) << 8);
         let channel = (data[2] as u16) + ((data[3] as u16) << 8);
         let payload = Data::new(&data[4..]);

bleps/src/sm.rs

@@ -206,7 +206,7 @@ bleps_dedup::dedup! {
 impl<'a, B, R> SYNC SecurityManager<'a, B, R> where B: BleWriter, R: CryptoRng + RngCore
 impl<'a, B, R> ASYNC AsyncSecurityManager<'a, B, R> where B: AsyncBleWriter, R: CryptoRng + RngCore
  {
-    pub(crate) async fn handle(&mut self, ble: &mut B, src_handle: u16, payload: crate::Data) -> Result<(), AttributeServerError> {
+    pub(crate) async fn handle(&mut self, ble: &mut B, src_handle: u16, payload: crate::Data, pin_callback: &mut Option<&mut dyn FnMut(u32)>) -> Result<(), AttributeServerError> {
         log::info!("SM packet {:02x?}", payload.as_slice());
 
         let data = &payload.as_slice()[1..];
@@ -220,7 +220,7 @@ impl<'a, B, R> ASYNC AsyncSecurityManager<'a, B, R> where B: AsyncBleWriter, R:
                 self.handle_pairing_public_key(ble, src_handle, data).await?;
             }
             SM_PAIRING_RANDOM => {
-                self.handle_pairing_random(ble, src_handle, data).await?;
+                self.handle_pairing_random(ble, src_handle, data, pin_callback).await?;
             }
             SM_PAIRING_DHKEY_CHECK => {
                 self.handle_pairing_dhkey_check(ble, src_handle, data).await?;
@@ -301,7 +301,7 @@ impl<'a, B, R> ASYNC AsyncSecurityManager<'a, B, R> where B: AsyncBleWriter, R:
         Ok(())
     }
 
-    async fn handle_pairing_random(&mut self, ble: &mut B, src_handle: u16, random: &[u8]) -> Result<(), AttributeServerError> {
+    async fn handle_pairing_random(&mut self, ble: &mut B, src_handle: u16, random: &[u8], pin_callback: &mut Option<&mut dyn FnMut(u32)>) -> Result<(), AttributeServerError> {
         log::info!("got pairing random {:02x?}", random);
 
         if *&(self.nb).is_none() {
@@ -345,6 +345,9 @@ impl<'a, B, R> ASYNC AsyncSecurityManager<'a, B, R> where B: AsyncBleWriter, R:
         // should display the code and get confirmation from user (pin ok or not) - if not okay send a pairing-failed
         // assume it's correct or the user will cancel on central
         log::info!("Display code is {}", vb.0);
+        if let Some(pin_callback) = pin_callback {
+            pin_callback(vb.0);
+        }
 
         // Authentication stage 2 and long term key calculation
         // ([Vol 3] Part H, Section 2.3.5.6.5 and C.2.2.4).

example/src/main.rs

@@ -160,6 +160,12 @@ fn main() {
             &mut rng,
         );
 
+        let mut pin_callback = |pin: u32| {
+            println!("PIN is {pin}");
+        };
+
+        srv.set_pin_callback(Some(&mut pin_callback));
+
         let mut response = [b'H', b'e', b'l', b'l', b'o', b'0'];
 
         loop {