refactor: remove C from HostResources

* Refactor API to remove C: Controller from HostResources
* Remove Clone + Copy on Stack and use it to hold the BleHost
* Remove all 'internal' lifetime of elements within channels. Guarantee
  their lifetime in types that is handed ownership of elements from
channels.
* Simplify packet pool, removing the QoS flag.

Issue #252

examples/apps/src/ble_advertise_multiple.rs

@@ -24,11 +24,9 @@ where
     let address: Address = Address::random([0xff, 0x8f, 0x1a, 0x05, 0xe4, 0xff]);
     info!("Our address = {:?}", address);
 
-    let mut resources: HostResources<C, CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> =
-        HostResources::new(PacketQos::None);
-    let (_, mut peripheral, _, mut runner) = trouble_host::new(controller, &mut resources)
-        .set_random_address(address)
-        .build();
+    let mut resources: HostResources<CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> = HostResources::new();
+    let stack = trouble_host::new(controller, &mut resources).set_random_address(address);
+    let (mut peripheral, _, mut runner) = stack.build();
 
     let mut adv_data = [0; 31];
     let len = AdStructure::encode_slice(

examples/apps/src/ble_bas_central.rs

@@ -17,11 +17,9 @@ where
     let address: Address = Address::random([0xff, 0x8f, 0x1b, 0x05, 0xe4, 0xff]);
     info!("Our address = {:?}", address);
 
-    let mut resources: HostResources<C, CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> =
-        HostResources::new(PacketQos::None);
-    let (stack, _, mut central, mut runner) = trouble_host::new(controller, &mut resources)
-        .set_random_address(address)
-        .build();
+    let mut resources: HostResources<CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> = HostResources::new();
+    let stack = trouble_host::new(controller, &mut resources).set_random_address(address);
+    let (_, mut central, mut runner) = stack.build();
 
     // NOTE: Modify this to match the address of the peripheral you want to connect to.
     // Currently it matches the address used by the peripheral examples
@@ -42,7 +40,7 @@ where
         let conn = central.connect(&config).await.unwrap();
         info!("Connected, creating gatt client");
 
-        let client = GattClient::<C, 10, 24>::new(stack, &conn).await.unwrap();
+        let client = GattClient::<C, 10, 24>::new(&stack, &conn).await.unwrap();
 
         let _ = join(client.task(), async {
             info!("Looking for battery service");

examples/apps/src/ble_bas_peripheral.rs

@@ -38,11 +38,9 @@ where
     let address: Address = Address::random([0xff, 0x8f, 0x1a, 0x05, 0xe4, 0xff]);
     info!("Our address = {:?}", address);
 
-    let mut resources: HostResources<C, CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> =
-        HostResources::new(PacketQos::None);
-    let (stack, mut peripheral, _, runner) = trouble_host::new(controller, &mut resources)
-        .set_random_address(address)
-        .build();
+    let mut resources: HostResources<CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> = HostResources::new();
+    let stack = trouble_host::new(controller, &mut resources).set_random_address(address);
+    let (mut peripheral, _, runner) = stack.build();
 
     info!("Starting advertising and GATT service");
     let server = Server::new_with_config(GapConfig::Peripheral(PeripheralConfig {
@@ -57,7 +55,7 @@ where
                 Ok(conn) => {
                     // set up tasks when the connection is established to a central, so they don't run when no one is connected.
                     let a = gatt_events_task(&server, &conn);
-                    let b = custom_task(&server, &conn, stack);
+                    let b = custom_task(&server, &conn, &stack);
                     // run until any task ends (usually because the connection has been closed),
                     // then return to advertising state.
                     select(a, b).await;
@@ -176,7 +174,7 @@ async fn advertise<'a, C: Controller>(
 /// This task will notify the connected central of a counter value every 2 seconds.
 /// It will also read the RSSI value every 2 seconds.
 /// and will stop when the connection is closed by the central or an error occurs.
-async fn custom_task<C: Controller>(server: &Server<'_>, conn: &Connection<'_>, stack: Stack<'_, C>) {
+async fn custom_task<C: Controller>(server: &Server<'_>, conn: &Connection<'_>, stack: &Stack<'_, C>) {
     let mut tick: u8 = 0;
     let level = server.battery_service.level;
     loop {

examples/apps/src/ble_l2cap_central.rs

@@ -17,12 +17,9 @@ where
     let address: Address = Address::random([0xff, 0x8f, 0x1b, 0x05, 0xe4, 0xff]);
     info!("Our address = {:?}", address);
 
-    let mut resources: HostResources<C, CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> =
-        HostResources::new(PacketQos::None);
-
-    let (stack, _, mut central, mut runner) = trouble_host::new(controller, &mut resources)
-        .set_random_address(address)
-        .build();
+    let mut resources: HostResources<CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> = HostResources::new();
+    let stack = trouble_host::new(controller, &mut resources).set_random_address(address);
+    let (_, mut central, mut runner) = stack.build();
 
     // NOTE: Modify this to match the address of the peripheral you want to connect to.
     // Currently it matches the address used by the peripheral examples
@@ -42,18 +39,18 @@ where
             let conn = central.connect(&config).await.unwrap();
             info!("Connected, creating l2cap channel");
             const PAYLOAD_LEN: usize = 27;
-            let mut ch1 = L2capChannel::create(stack, &conn, 0x2349, &Default::default())
+            let mut ch1 = L2capChannel::create(&stack, &conn, 0x2349, &Default::default())
                 .await
                 .unwrap();
             info!("New l2cap channel created, sending some data!");
             for i in 0..10 {
                 let tx = [i; PAYLOAD_LEN];
-                ch1.send::<_, PAYLOAD_LEN>(stack, &tx).await.unwrap();
+                ch1.send::<_, PAYLOAD_LEN>(&stack, &tx).await.unwrap();
             }
             info!("Sent data, waiting for them to be sent back");
             let mut rx = [0; PAYLOAD_LEN];
             for i in 0..10 {
-                let len = ch1.receive(stack, &mut rx).await.unwrap();
+                let len = ch1.receive(&stack, &mut rx).await.unwrap();
                 assert_eq!(len, rx.len());
                 assert_eq!(rx, [i; PAYLOAD_LEN]);
             }

examples/apps/src/ble_l2cap_peripheral.rs

@@ -12,16 +12,13 @@ pub async fn run<C, const L2CAP_MTU: usize>(controller: C)
 where
     C: Controller,
 {
-    let mut resources: HostResources<C, CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> =
-        HostResources::new(PacketQos::None);
-
     // Hardcoded peripheral address
     let address: Address = Address::random([0xff, 0x8f, 0x1a, 0x05, 0xe4, 0xff]);
     info!("Our address = {:?}", address);
 
-    let (stack, mut peripheral, _, mut runner) = trouble_host::new(controller, &mut resources)
-        .set_random_address(address)
-        .build();
+    let mut resources: HostResources<CONNECTIONS_MAX, L2CAP_CHANNELS_MAX, L2CAP_MTU> = HostResources::new();
+    let stack = trouble_host::new(controller, &mut resources).set_random_address(address);
+    let (mut peripheral, _, mut runner) = stack.build();
 
     let mut adv_data = [0; 31];
     AdStructure::encode_slice(
@@ -50,7 +47,7 @@ where
 
             info!("Connection established");
 
-            let mut ch1 = L2capChannel::accept(stack, &conn, &[0x2349], &Default::default())
+            let mut ch1 = L2capChannel::accept(&stack, &conn, &[0x2349], &Default::default())
                 .await
                 .unwrap();
 
@@ -60,7 +57,7 @@ where
             const PAYLOAD_LEN: usize = 27;
             let mut rx = [0; PAYLOAD_LEN];
             for i in 0..10 {
-                let len = ch1.receive(stack, &mut rx).await.unwrap();
+                let len = ch1.receive(&stack, &mut rx).await.unwrap();
                 assert_eq!(len, rx.len());
                 assert_eq!(rx, [i; PAYLOAD_LEN]);
             }
@@ -69,7 +66,7 @@ where
             Timer::after(Duration::from_secs(1)).await;
             for i in 0..10 {
                 let tx = [i; PAYLOAD_LEN];
-                ch1.send::<_, PAYLOAD_LEN>(stack, &tx).await.unwrap();
+                ch1.send::<_, PAYLOAD_LEN>(&stack, &tx).await.unwrap();
             }
             info!("L2CAP data echoed");
 

host/src/central.rs

@@ -1,26 +1,25 @@
 //! Functionality for the BLE central role.
-use crate::connection::{ConnectConfig, Connection};
+use crate::connection::{ConnectConfig, Connection, PhySet};
 use crate::{BleHostError, Error, Stack};
 use bt_hci::cmd::le::{LeAddDeviceToFilterAcceptList, LeClearFilterAcceptList, LeCreateConn, LeExtCreateConn};
 use bt_hci::controller::{Controller, ControllerCmdAsync, ControllerCmdSync};
 use bt_hci::param::{AddrKind, BdAddr, InitiatingPhy, LeConnRole, PhyParams};
 #[cfg(feature = "controller-host-flow-control")]
 use bt_hci::param::{ConnHandleCompletedPackets, ControllerToHostFlowControl};
 use embassy_futures::select::{select, Either};
-use embassy_time::Duration;
 
 /// A type implementing the BLE central role.
-pub struct Central<'d, C: Controller> {
-    pub(crate) stack: Stack<'d, C>,
+pub struct Central<'stack, C: Controller> {
+    pub(crate) stack: &'stack Stack<'stack, C>,
 }
 
-impl<'d, C: Controller> Central<'d, C> {
-    pub(crate) fn new(stack: Stack<'d, C>) -> Self {
+impl<'stack, C: Controller> Central<'stack, C> {
+    pub(crate) fn new(stack: &'stack Stack<'stack, C>) -> Self {
         Self { stack }
     }
 
     /// Attempt to create a connection with the provided config.
-    pub async fn connect(&mut self, config: &ConnectConfig<'_>) -> Result<Connection<'d>, BleHostError<C::Error>>
+    pub async fn connect(&mut self, config: &ConnectConfig<'_>) -> Result<Connection<'stack>, BleHostError<C::Error>>
     where
         C: ControllerCmdSync<LeClearFilterAcceptList>
             + ControllerCmdSync<LeAddDeviceToFilterAcceptList>
@@ -30,7 +29,7 @@ impl<'d, C: Controller> Central<'d, C> {
             return Err(Error::InvalidValue.into());
         }
 
-        let host = self.stack.host;
+        let host = &self.stack.host;
         let _drop = crate::host::OnDrop::new(|| {
             host.connect_command_state.cancel(true);
         });
@@ -70,7 +69,10 @@ impl<'d, C: Controller> Central<'d, C> {
     }
 
     /// Attempt to create a connection with the provided config.
-    pub async fn connect_ext(&mut self, config: &ConnectConfig<'_>) -> Result<Connection<'d>, BleHostError<C::Error>>
+    pub async fn connect_ext(
+        &mut self,
+        config: &ConnectConfig<'_>,
+    ) -> Result<Connection<'stack>, BleHostError<C::Error>>
     where
         C: ControllerCmdSync<LeClearFilterAcceptList>
             + ControllerCmdSync<LeAddDeviceToFilterAcceptList>
@@ -80,7 +82,7 @@ impl<'d, C: Controller> Central<'d, C> {
             return Err(Error::InvalidValue.into());
         }
 
-        let host = self.stack.host;
+        let host = &self.stack.host;
         // Ensure no other connect ongoing.
         let _drop = crate::host::OnDrop::new(|| {
             host.connect_command_state.cancel(true);
@@ -133,7 +135,7 @@ impl<'d, C: Controller> Central<'d, C> {
     where
         C: ControllerCmdSync<LeClearFilterAcceptList> + ControllerCmdSync<LeAddDeviceToFilterAcceptList>,
     {
-        let host = self.stack.host;
+        let host = &self.stack.host;
         host.command(LeClearFilterAcceptList::new()).await?;
         for entry in filter_accept_list {
             host.command(LeAddDeviceToFilterAcceptList::new(entry.0, *entry.1))
@@ -160,53 +162,3 @@ pub(crate) fn create_phy_params<P: Copy>(phy: P, phys: PhySet) -> PhyParams<P> {
     };
     phy_params
 }
-
-/// Scanner configuration.
-pub struct ScanConfig<'d> {
-    /// Active scanning.
-    pub active: bool,
-    /// List of addresses to accept.
-    pub filter_accept_list: &'d [(AddrKind, &'d BdAddr)],
-    /// PHYs to scan on.
-    pub phys: PhySet,
-    /// Scan interval.
-    pub interval: Duration,
-    /// Scan window.
-    pub window: Duration,
-    /// Scan timeout.
-    pub timeout: Duration,
-}
-
-impl Default for ScanConfig<'_> {
-    fn default() -> Self {
-        Self {
-            active: true,
-            filter_accept_list: &[],
-            phys: PhySet::M1,
-            interval: Duration::from_secs(1),
-            window: Duration::from_secs(1),
-            timeout: Duration::from_secs(0),
-        }
-    }
-}
-
-/// PHYs to scan on.
-#[cfg_attr(feature = "defmt", derive(defmt::Format))]
-#[derive(Eq, PartialEq, Copy, Clone)]
-#[repr(u8)]
-pub enum PhySet {
-    /// 1Mbps phy
-    M1 = 1,
-    /// 2Mbps phy
-    M2 = 2,
-    /// 1Mbps + 2Mbps phys
-    M1M2 = 3,
-    /// Coded phy (125kbps, S=8)
-    Coded = 4,
-    /// 1Mbps and Coded phys
-    M1Coded = 5,
-    /// 2Mbps and Coded phys
-    M2Coded = 6,
-    /// 1Mbps, 2Mbps and Coded phys
-    M1M2Coded = 7,
-}