esp32-nimble 0.12.0

A wrapper for the ESP32 NimBLE Bluetooth stack.
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use super::ble_client::BLEClientState;
use crate::{
    BLEAttribute, BLEError, BLERemoteCharacteristic, Signal, ble,
    utilities::{ArcUnsafeCell, BleUuid, WeakUnsafeCell, as_void_ptr, voidp_to_ref},
};
use alloc::vec::Vec;
use core::ffi::c_void;
use esp_idf_svc::sys as esp_idf_sys;

pub struct BLERemoteServiceState {
    client: WeakUnsafeCell<BLEClientState>,
    pub(crate) uuid: BleUuid,
    start_handle: u16,
    pub(crate) end_handle: u16,
    pub(crate) characteristics: Option<Vec<BLERemoteCharacteristic>>,
    signal: Signal<u32>,
}

impl BLEAttribute for BLERemoteServiceState {
    fn get_client(&self) -> Option<ArcUnsafeCell<BLEClientState>> {
        self.client.upgrade()
    }
}

#[derive(Clone)]
pub struct BLERemoteService {
    pub(crate) state: ArcUnsafeCell<BLERemoteServiceState>,
}

impl BLERemoteService {
    pub(crate) fn new(
        client: WeakUnsafeCell<BLEClientState>,
        service: &esp_idf_sys::ble_gatt_svc,
    ) -> Self {
        Self {
            state: ArcUnsafeCell::new(BLERemoteServiceState {
                client,
                uuid: BleUuid::from(service.uuid),
                start_handle: service.start_handle,
                end_handle: service.end_handle,
                characteristics: None,
                signal: Signal::new(),
            }),
        }
    }

    /// Get the service UUID.
    pub fn uuid(&self) -> BleUuid {
        self.state.uuid
    }

    pub async fn get_characteristics(
        &mut self,
    ) -> Result<core::slice::IterMut<'_, BLERemoteCharacteristic>, BLEError> {
        if self.state.characteristics.is_none() {
            self.state.characteristics = Some(Vec::new());
            unsafe {
                ble!(esp_idf_sys::ble_gattc_disc_all_chrs(
                    self.state.conn_handle(),
                    self.state.start_handle,
                    self.state.end_handle,
                    Some(Self::characteristic_disc_cb),
                    as_void_ptr(self),
                ))?;
            }
            ble!(self.state.signal.wait().await)?;
        }

        Ok(self.state.characteristics.as_mut().unwrap().iter_mut())
    }

    /// Get the characteristic object for the UUID.
    pub async fn get_characteristic(
        &mut self,
        uuid: BleUuid,
    ) -> Result<&mut BLERemoteCharacteristic, BLEError> {
        let mut iter = self.get_characteristics().await?;
        iter.find(|x| x.uuid() == uuid)
            .ok_or_else(|| BLEError::fail().unwrap_err())
    }

    extern "C" fn characteristic_disc_cb(
        conn_handle: u16,
        error: *const esp_idf_sys::ble_gatt_error,
        chr: *const esp_idf_sys::ble_gatt_chr,
        arg: *mut c_void,
    ) -> i32 {
        let service = unsafe { voidp_to_ref::<Self>(arg) };
        if service.state.conn_handle() != conn_handle {
            return 0;
        }
        let error = unsafe { &*error };

        if error.status == 0 {
            let chr = unsafe { &*chr };
            let chr = BLERemoteCharacteristic::new(ArcUnsafeCell::downgrade(&service.state), chr);
            service.state.characteristics.as_mut().unwrap().push(chr);
            return 0;
        }

        service.state.signal.signal(error.status as _);
        error.status as _
    }
}

impl core::fmt::Display for BLERemoteService {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        write!(f, "BLERemoteService[{}]", self.state.uuid)
    }
}

impl core::fmt::Debug for BLERemoteService {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        f.debug_struct("BLERemoteService")
            .field("uuid", &self.state.uuid)
            .field("start_handle", &self.state.start_handle)
            .field("end_handle", &self.state.end_handle)
            .field(
                "characteristics",
                &self
                    .state
                    .characteristics
                    .as_ref()
                    .map(|chars| chars.iter().map(|c| c.uuid()).collect::<Vec<_>>()),
            )
            .finish()
    }
}