esp32-nimble 0.12.0

A wrapper for the ESP32 NimBLE Bluetooth stack.
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use super::{L2cap, ReceivedData};
use crate::{
    BLEError, Channel, ble,
    utilities::{as_void_ptr, extend_lifetime_mut, mutex::Mutex, voidp_to_ref},
};
use esp_idf_svc::sys;

const N: usize = sys::CONFIG_BT_NIMBLE_L2CAP_COC_MAX_NUM as usize;
static SERVER_LIST: Mutex<heapless::Vec<L2capServer, N>> = Mutex::new(heapless::Vec::new());

#[allow(clippy::type_complexity)]
pub struct L2capServer {
    l2cap: L2cap,
    coc_chan: *mut sys::ble_l2cap_chan,
    peer_sdu_size: u16,
    channel: Channel<ReceivedData, 1>,
}

impl L2capServer {
    pub fn create(psm: u16, mtu: u16) -> Result<&'static mut L2capServer, BLEError> {
        let mut list = SERVER_LIST.lock();
        list.push(L2capServer {
            l2cap: Default::default(),
            coc_chan: core::ptr::null_mut(),
            peer_sdu_size: 0,
            channel: Channel::new(),
        })
        .map_err(|_| BLEError::convert(sys::BLE_HS_ENOMEM as _).unwrap_err())?;

        let server = list.last_mut().unwrap();
        server.l2cap.init(mtu, 20)?;

        unsafe {
            ble!(sys::ble_l2cap_create_server(
                psm,
                mtu,
                Some(Self::handle_l2cap_event),
                as_void_ptr(server),
            ))?;
        }
        Ok(unsafe { extend_lifetime_mut(server) })
    }

    pub fn tx(&mut self, data: &[u8]) -> Result<(), BLEError> {
        self.l2cap.tx(self.coc_chan, data)
    }

    pub async fn rx(&mut self) -> ReceivedData {
        self.channel.receive().await
    }

    pub(crate) extern "C" fn handle_l2cap_event(
        _event: *mut sys::ble_l2cap_event,
        arg: *mut core::ffi::c_void,
    ) -> i32 {
        let event = unsafe { &*_event };
        let server = unsafe { voidp_to_ref::<Self>(arg) };

        match event.type_ as _ {
            sys::BLE_L2CAP_EVENT_COC_CONNECTED => {
                let connect = unsafe { event.__bindgen_anon_1.connect };
                if connect.status > 0 {
                    ::log::warn!("LE COC error: {}", connect.status);
                    return 0;
                }

                server.coc_chan = connect.chan;
                0
            }
            sys::BLE_L2CAP_EVENT_COC_DISCONNECTED => {
                let disconnect = unsafe { event.__bindgen_anon_1.disconnect };
                ::log::debug!("LE CoC disconnected: {:?}", disconnect.chan);
                server.coc_chan = core::ptr::null_mut();
                0
            }
            sys::BLE_L2CAP_EVENT_COC_ACCEPT => {
                let accept = unsafe { event.__bindgen_anon_1.accept };
                server.peer_sdu_size = accept.peer_sdu_size;
                server.l2cap.ble_l2cap_recv_ready(accept.chan);
                0
            }
            sys::BLE_L2CAP_EVENT_COC_DATA_RECEIVED => {
                let receive = unsafe { event.__bindgen_anon_1.receive };
                if !receive.sdu_rx.is_null() {
                    let _ = server.channel.try_send(ReceivedData::from_raw(receive));
                }
                server.l2cap.ble_l2cap_recv_ready(receive.chan);
                0
            }

            _ => 0,
        }
    }
}

unsafe impl Send for L2capServer {}