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BLE: Add service UUID to advertisement, remove descriptors to save space

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This commit is contained in:
Jannik Beyerstedt 2026-08-24 15:16:36 +02:00
commit 3213667eea
2 changed files with 16 additions and 8 deletions
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3
Readme.md
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@ -59,6 +59,9 @@ Enable UART I/O protocol according to [docs/uart-protocol.md](./docs/uart-protoc
Enable BLE I/O protocol according to [docs/ble-protocol.md](./docs/ble-protocol.md).
Enabling `denm` feature or `cam` feature is recommended, otherwise no data will be received.
Note: When changing the set of supported messages on the BLE interface, you may need to turn bluetooth off and on again on your client device.
Otherwise the client may not re-scan the service's characteristics and still use the previous set of characteristics.
## Usage

21
src/ble.rs
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@ -56,7 +56,7 @@ struct CITSEvents {
raw_notify: [u8; io::msg::RawNotify::PROTO_SIZE],
#[cfg(feature = "cam")]
#[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "CAM", read, value = "RawMsgRx proto msg", type = &'static str)]
// #[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "CAM", read, value = "RawMsgRx proto msg", type = &'static str)]
#[characteristic(uuid = "c0b70001-d4f4-4003-ada8-f99a02ee315c", read, value = [0u8; io::msg::RawMsgRx::PROTO_SIZE])]
cam_raw: [u8; io::msg::RawMsgRx::PROTO_SIZE],
#[cfg(feature = "cam")]
@ -65,7 +65,7 @@ struct CITSEvents {
cam_event: [u8; io::msg::CamEvent::PROTO_SIZE],
#[cfg(feature = "denm")]
#[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "DENM", read, value = "RawMsgRx proto msg", type = &'static str)]
// #[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "DENM", read, value = "RawMsgRx proto msg", type = &'static str)]
#[characteristic(uuid = "c0b70001-d4f4-4005-ada8-f99a02ee315c", read, value = [0u8; io::msg::RawMsgRx::PROTO_SIZE])]
denm_raw: [u8; io::msg::RawMsgRx::PROTO_SIZE],
#[cfg(feature = "denm")]
@ -74,11 +74,11 @@ struct CITSEvents {
denm_event: [u8; io::msg::DenmEvent::PROTO_SIZE],
#[cfg(feature = "spat")]
#[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "MAPEM", read, value = "RawMsgRx proto msg", type = &'static str)]
// #[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "MAPEM", read, value = "RawMsgRx proto msg", type = &'static str)]
#[characteristic(uuid = "c0b70001-d4f4-4007-ada8-f99a02ee315c", read, value = [0u8; io::msg::RawMsgRx::PROTO_SIZE])]
mapem_raw: [u8; io::msg::RawMsgRx::PROTO_SIZE],
#[cfg(feature = "spat")]
#[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "SPATEM", read, value = "RawMsgRx proto msg", type = &'static str)]
// #[descriptor(uuid = descriptors::MEASUREMENT_DESCRIPTION, name = "SPATEM", read, value = "RawMsgRx proto msg", type = &'static str)]
#[characteristic(uuid = "c0b70001-d4f4-4008-ada8-f99a02ee315c", read, value = [0u8; io::msg::RawMsgRx::PROTO_SIZE])]
spatem_raw: [u8; io::msg::RawMsgRx::PROTO_SIZE],
}
@ -143,8 +143,10 @@ pub async fn run(
let _ = embassy_futures::join::join(ble_task(runner), async {
loop {
match advertise("ESP32 C-ITS", &mut peripheral, &server).await {
match advertise(&mut peripheral, &server).await {
Ok(conn) => {
info!("BLE: New client connected");
// 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 = publishing_task(&server, &conn);
@ -158,7 +160,7 @@ pub async fn run(
});
}
Err(e) => {
panic!("BLE ADV: fatal error {e:?}");
panic!("BLE ADV: fatal error: {e:?}");
}
}
}
@ -183,15 +185,18 @@ pub fn update(payload: BleSendable) {
/// Create an advertiser to use to connect to a BLE Central, and wait for it to connect.
async fn advertise<'values, 'server, C: Controller>(
name: &'values str,
peripheral: &mut Peripheral<'values, C, DefaultPacketPool>,
server: &'server Server<'values>,
) -> Result<GattConnection<'values, 'server, DefaultPacketPool>, BleHostError<C::Error>> {
let mut advertiser_data = [0; 35];
let service_uuid = Uuid::from(0xc0b7_0000_d4f4_4000_ada8_f99a_02ee_315c_u128)
.as_raw()
.try_into()
.unwrap();
let len = AdStructure::encode_slice(
&[
AdStructure::Flags(LE_GENERAL_DISCOVERABLE | BR_EDR_NOT_SUPPORTED),
AdStructure::CompleteLocalName(name.as_bytes()),
AdStructure::ServiceUuids128(&[service_uuid]),
],
&mut advertiser_data[..],
)?;