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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
#[path = "../example_common.rs"]
mod example_common;
use example_common::*;
use core::mem;
use cortex_m_rt::entry;
use defmt::info;
use nrf_softdevice::ble::{central, gatt_client, Address, Connection, Uuid};
use nrf_softdevice::raw;
use nrf_softdevice::Softdevice;
#[static_executor::task]
async fn softdevice_task(sd: &'static Softdevice) {
sd.run().await;
}
struct BatteryServiceClient {
conn: Connection,
battery_level_value_handle: u16,
battery_level_cccd_handle: u16,
}
const GATT_BAS_SVC_UUID: Uuid = Uuid::new_16(0x180F);
const GATT_BAS_BATTERY_LEVEL_CHAR_UUID: Uuid = Uuid::new_16(0x2A19);
// This is mostly boilerplate, ideally it'll be generated with a proc macro in the future.
impl gatt_client::Client for BatteryServiceClient {
fn uuid() -> Uuid {
return GATT_BAS_SVC_UUID;
}
fn new_undiscovered(conn: Connection) -> Self {
Self {
conn,
battery_level_value_handle: 0,
battery_level_cccd_handle: 0,
}
}
fn discovered_characteristic(
&mut self,
characteristic: &gatt_client::Characteristic,
descriptors: &[gatt_client::Descriptor],
) {
if let Some(char_uuid) = characteristic.uuid {
if char_uuid == GATT_BAS_BATTERY_LEVEL_CHAR_UUID {
// TODO maybe check the char_props have the necessary operations allowed? read/write/notify/etc
self.battery_level_value_handle = characteristic.handle_value;
for desc in descriptors {
if let Some(desc_uuid) = desc.uuid {
if desc_uuid
== Uuid::new_16(raw::BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG as u16)
{
self.battery_level_cccd_handle = desc.handle;
}
}
}
}
}
}
fn discovery_complete(&mut self) -> Result<(), gatt_client::DiscoverError> {
if self.battery_level_cccd_handle == 0 || self.battery_level_value_handle == 0 {
return Err(gatt_client::DiscoverError::ServiceIncomplete);
}
Ok(())
}
}
#[static_executor::task]
async fn ble_central_task(sd: &'static Softdevice) {
let addrs = &[Address::new_random_static([
0x59, 0xf9, 0xb1, 0x9c, 0x01, 0xf5,
])];
let conn = central::connect(sd, addrs)
.await
.dexpect(intern!("connect"));
info!("connected");
let client: BatteryServiceClient = gatt_client::discover(&conn)
.await
.dexpect(intern!("discover"));
info!(
"discovered! {:u16} {:u16}",
client.battery_level_value_handle, client.battery_level_cccd_handle
);
let buf = &mut [0; 16];
let len = gatt_client::read(&conn, client.battery_level_value_handle, buf)
.await
.dexpect(intern!("read"));
info!("read battery level: {:[u8]}", &buf[..len]);
}
#[entry]
fn main() -> ! {
info!("Hello World!");
let config = nrf_softdevice::Config {
clock: Some(raw::nrf_clock_lf_cfg_t {
source: raw::NRF_CLOCK_LF_SRC_XTAL as u8,
rc_ctiv: 0,
rc_temp_ctiv: 0,
accuracy: 7,
}),
conn_gap: Some(raw::ble_gap_conn_cfg_t {
conn_count: 6,
event_length: 6,
}),
conn_gatt: Some(raw::ble_gatt_conn_cfg_t { att_mtu: 128 }),
gatts_attr_tab_size: Some(raw::ble_gatts_cfg_attr_tab_size_t {
attr_tab_size: 32768,
}),
gap_role_count: Some(raw::ble_gap_cfg_role_count_t {
adv_set_count: 1,
periph_role_count: 3,
central_role_count: 3,
central_sec_count: 0,
_bitfield_1: raw::ble_gap_cfg_role_count_t::new_bitfield_1(0),
}),
gap_device_name: Some(raw::ble_gap_cfg_device_name_t {
p_value: b"HelloRust" as *const u8 as _,
current_len: 9,
max_len: 9,
write_perm: unsafe { mem::zeroed() },
_bitfield_1: raw::ble_gap_cfg_device_name_t::new_bitfield_1(
raw::BLE_GATTS_VLOC_STACK as u8,
),
}),
..Default::default()
};
let sd = Softdevice::enable(&config);
unsafe {
softdevice_task.spawn(sd).dewrap();
ble_central_task.spawn(sd).dewrap();
static_executor::run();
}
}
|
