Stream heart rate from a strap or watch into the ride and the FIT file
A new HRM client in the BLE crate follows the crate's split: the 0x2A37 decoder is a pure function over bytes (u8/u16 formats, the three-state sensor-contact field, straps that append energy/RR data), and only the actor touches the radio. Anything exposing the standard Heart Rate Service works — a chest strap, or a Garmin watch with Broadcast Heart Rate on. A single-slot supervisor in the app owns the link, shaped like the trainer's and the controller's. It publishes bpm on a watch channel the session backend stamps onto each tick's telemetry — never over a heart rate FTMS itself reported, on the same authority rule as the Zwift cadence merge — and it clears the reading after eight silent seconds, so a strap taken off records nothing rather than a flatline of the last real value. From there the existing pipeline does the rest: ride screen tile, FIT records, avg/max in lap and session. The device list routes heart-rate rows to the supervisor, keeps the row alive while connected (a connected monitor stops advertising), and shows the live bpm as proof data is flowing — a connected-but-silent monitor otherwise looks exactly like a working one. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Claude Fable 5
@@ -0,0 +1,675 @@
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//! Heart rate monitor client: decoder and connection actor.
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//!
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//! Structurally a sibling of [`crate::click`]: one task owns the peripheral,
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//! callers hold a cheap handle and receive [`HeartRateEvent`]s on a broadcast
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//! channel. The wire format lives in this module too, as pure functions over
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//! bytes, because it is a single characteristic and does not earn a module of
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//! its own.
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//!
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//! ```text
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//! caller ◄──broadcast── HeartRateEvent ◄── actor ◄─notify── HRM / watch
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//! ```
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//!
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//! Works with anything that exposes the standard Heart Rate Service (`0x180D`)
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//! — a chest strap, or a sports watch with *Broadcast Heart Rate* switched on.
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//! A watch in broadcast mode accepts a single central, so connecting it here
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//! takes it away from any other app; that is a property of the watch, not of
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//! this client.
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//!
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//! Read-only in every sense: nothing is ever written to the device, so — like
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//! the Click and unlike the trainer — there is no safety sequence, only the
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//! SAF-9 obligation to actually close the link on the way out.
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use std::future::Future;
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use std::time::Duration;
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use btleplug::api::{Characteristic, Peripheral as _};
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use btleplug::platform::{Adapter, Peripheral};
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use futures::{Stream, StreamExt};
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use tokio::sync::{broadcast, mpsc, oneshot};
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use crate::client::{Backoff, InFlight, DISCONNECT_TIMEOUT};
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use crate::error::FtmsError;
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use crate::indoor_bike_data::hex;
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use crate::scan::{self, DiscoveredDevice, ScanKind};
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use crate::uuids;
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// ---------------------------------------------------------------------------
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// Wire format (pure)
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// ---------------------------------------------------------------------------
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/// One decoded Heart Rate Measurement (`0x2A37`) notification.
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///
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/// Only what the app uses. The characteristic can also carry energy expended
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/// and RR intervals; both are skipped, not rejected — a device that sends them
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/// still decodes.
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub struct HeartRateMeasurement {
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/// Beats per minute. `u16` because the flags allow it, though anything a
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/// human produces fits in a `u8`.
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pub bpm: u16,
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/// Skin contact, where the device reports the feature at all. `None` means
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/// "not supported", not "no contact" — the two must not be conflated, or
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/// every strap without the feature reads as fallen off.
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pub sensor_contact: Option<bool>,
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}
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/// Why a Heart Rate Measurement frame would not decode.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, thiserror::Error)]
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pub enum HrDecodeError {
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#[error("empty heart rate measurement")]
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Empty,
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#[error("heart rate measurement of {len} bytes is too short for its flags (0x{flags:02x})")]
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TooShort { flags: u8, len: usize },
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}
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/// Decode a Heart Rate Measurement (`0x2A37`) value.
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///
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/// Layout per the Bluetooth SIG GATT specification: a flags byte, then the
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/// heart rate as `u8` or `u16` little-endian depending on flags bit 0. Bits
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/// 1–2 describe sensor contact: bit 2 says the feature is supported, bit 1
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/// says contact is detected.
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pub fn decode_heart_rate(data: &[u8]) -> Result<HeartRateMeasurement, HrDecodeError> {
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let (&flags, rest) = data.split_first().ok_or(HrDecodeError::Empty)?;
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let bpm = if flags & 0x01 == 0 {
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*rest.first().ok_or(HrDecodeError::TooShort {
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flags,
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len: data.len(),
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})? as u16
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} else {
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match rest {
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[lo, hi, ..] => u16::from_le_bytes([*lo, *hi]),
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_ => {
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return Err(HrDecodeError::TooShort {
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flags,
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len: data.len(),
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})
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}
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}
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};
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let sensor_contact = match flags & 0x06 {
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0x06 => Some(true),
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0x04 => Some(false),
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_ => None,
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};
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Ok(HeartRateMeasurement {
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bpm,
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sensor_contact,
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})
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}
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// ---------------------------------------------------------------------------
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// Selection and configuration
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// ---------------------------------------------------------------------------
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/// How to pick a heart rate monitor out of a scan.
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum HrSelector {
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/// A specific device, by address — what the app uses, since the scan has
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/// already identified it. Matched without insisting on the advertisement:
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/// a device mid-connection may not be advertising its services.
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Address(String),
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/// Any peripheral advertising the Heart Rate Service (`0x180D`).
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Any,
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}
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impl HrSelector {
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pub fn matches(&self, d: &DiscoveredDevice) -> bool {
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self.matches_parts(
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&d.address,
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d.services.contains(&uuids::HEART_RATE_SERVICE),
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&format!("{:?}", d.id),
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)
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}
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/// The matching rule, factored out so it can be unit-tested without a
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/// `PeripheralId` (which only the platform backend can construct).
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pub(crate) fn matches_parts(
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&self,
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address: &str,
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advertises_hr: bool,
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id_debug: &str,
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) -> bool {
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match self {
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HrSelector::Address(a) => {
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address.eq_ignore_ascii_case(a)
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|| id_debug.to_lowercase().contains(&a.to_lowercase())
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}
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HrSelector::Any => advertises_hr,
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}
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}
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/// Human-readable, for error messages the rider will actually read.
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pub fn describe(&self) -> String {
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match self {
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HrSelector::Address(a) => format!("heart rate monitor at {a}"),
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HrSelector::Any => "any heart rate monitor".to_string(),
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}
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}
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}
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/// Tunables for [`HeartRateClient`].
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#[derive(Debug, Clone)]
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pub struct HeartRateConfig {
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/// How long to look before giving up. A broadcasting device advertises
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/// continuously — unlike a Click — so this needs no extra patience.
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pub scan_timeout: Duration,
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pub backoff: Backoff,
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pub channel_capacity: usize,
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}
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impl Default for HeartRateConfig {
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fn default() -> Self {
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Self {
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scan_timeout: Duration::from_secs(15),
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backoff: Backoff::default(),
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channel_capacity: 64,
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}
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}
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}
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// ---------------------------------------------------------------------------
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// Events and handle
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// ---------------------------------------------------------------------------
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/// Everything the app learns from a heart rate monitor.
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#[derive(Debug, Clone, PartialEq)]
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pub enum HeartRateEvent {
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Connected {
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address: String,
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name: Option<String>,
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/// Read once at connect, where the device exposes `0x2A19` at all.
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battery_percent: Option<u8>,
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},
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/// The link dropped. The actor is retrying — this is not terminal.
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Disconnected,
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/// Reconnecting ran out of attempts and the actor has stopped (FR-1.11).
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/// Terminal: nothing further arrives on this stream.
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GaveUp { attempts: u32 },
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/// A decoded measurement.
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Measurement {
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bpm: u16,
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sensor_contact: Option<bool>,
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},
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}
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enum Cmd {
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Shutdown { reply: oneshot::Sender<()> },
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}
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/// Cheap, cloneable handle to a heart rate monitor session.
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#[derive(Clone)]
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pub struct HeartRateClient {
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cmd_tx: mpsc::Sender<Cmd>,
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events_tx: broadcast::Sender<HeartRateEvent>,
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address: String,
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name: Option<String>,
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battery_percent: Option<u8>,
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}
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impl HeartRateClient {
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/// Carried on the handle rather than left to the event stream, because the
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/// first `Connected` is sent before the caller has had a chance to
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/// subscribe — same reasoning as [`crate::click::ClickClient::address`].
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pub fn address(&self) -> &str {
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&self.address
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}
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pub fn name(&self) -> Option<&str> {
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self.name.as_deref()
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}
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/// Battery level at connect time, where the device reported one.
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pub fn battery_percent(&self) -> Option<u8> {
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self.battery_percent
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}
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/// Connect to a heart rate monitor and start streaming measurements.
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///
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/// Returns once the measurement characteristic is subscribed, so an `Ok`
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/// means data is genuinely on its way — not merely that a link exists.
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pub async fn connect(
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selector: HrSelector,
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config: HeartRateConfig,
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) -> Result<Self, FtmsError> {
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let adapter = scan::default_adapter().await?;
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Self::connect_with_adapter(adapter, selector, config).await
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}
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|
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/// As [`HeartRateClient::connect`], but abandoned as soon as `cancel`
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/// resolves. Returns `Ok(None)` when it was cancelled; any link the
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/// abandoned attempt had opened is closed before this returns (SAF-9,
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/// FR-1.10).
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pub async fn connect_cancellable(
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selector: HrSelector,
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config: HeartRateConfig,
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cancel: impl Future<Output = ()>,
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) -> Result<Option<Self>, FtmsError> {
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let in_flight = InFlight::default();
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let outcome = {
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let attempt = async {
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let adapter = scan::default_adapter().await?;
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Self::connect_on(adapter, selector, config, &in_flight).await
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};
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tokio::pin!(attempt, cancel);
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tokio::select! {
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result = &mut attempt => Some(result),
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() = &mut cancel => None,
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||||
}
|
||||
};
|
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match outcome {
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Some(result) => result.map(Some),
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None => {
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tracing::info!("hr: connect attempt cancelled");
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in_flight.abandon().await;
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Ok(None)
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||||
}
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}
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}
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|
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/// As [`HeartRateClient::connect`], but on a caller-supplied adapter.
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pub async fn connect_with_adapter(
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adapter: Adapter,
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selector: HrSelector,
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config: HeartRateConfig,
|
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) -> Result<Self, FtmsError> {
|
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Self::connect_on(adapter, selector, config, &InFlight::default()).await
|
||||
}
|
||||
|
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async fn connect_on(
|
||||
adapter: Adapter,
|
||||
selector: HrSelector,
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config: HeartRateConfig,
|
||||
in_flight: &InFlight,
|
||||
) -> Result<Self, FtmsError> {
|
||||
let (events_tx, _) = broadcast::channel(config.channel_capacity);
|
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let (cmd_tx, cmd_rx) = mpsc::channel(8);
|
||||
|
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let (session, notifications) =
|
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open_session(&adapter, &selector, &config, in_flight).await?;
|
||||
let (address, name, battery_percent) = (
|
||||
session.address.clone(),
|
||||
session.name.clone(),
|
||||
session.battery_percent,
|
||||
);
|
||||
// Sent for symmetry with a reconnect; the same facts ride out on the
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// handle below because nobody is subscribed yet.
|
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let _ = events_tx.send(HeartRateEvent::Connected {
|
||||
address: address.clone(),
|
||||
name: name.clone(),
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battery_percent,
|
||||
});
|
||||
|
||||
let actor = Actor {
|
||||
adapter,
|
||||
// Reconnect to *this* device, not to whatever HRM now answers
|
||||
// first — two straps in a household is not exotic.
|
||||
selector: if address.is_empty() {
|
||||
selector
|
||||
} else {
|
||||
HrSelector::Address(address.clone())
|
||||
},
|
||||
config,
|
||||
events_tx: events_tx.clone(),
|
||||
};
|
||||
tokio::spawn(actor.run(cmd_rx, session, Box::pin(notifications)));
|
||||
|
||||
Ok(Self {
|
||||
cmd_tx,
|
||||
events_tx,
|
||||
address,
|
||||
name,
|
||||
battery_percent,
|
||||
})
|
||||
}
|
||||
|
||||
/// Subscribe to events. Late subscribers see only what arrives after they
|
||||
/// subscribe.
|
||||
pub fn events(&self) -> broadcast::Receiver<HeartRateEvent> {
|
||||
self.events_tx.subscribe()
|
||||
}
|
||||
|
||||
/// Close the link, and wait for it to actually be closed (SAF-9).
|
||||
/// Idempotent — shutting down a stopped client is a no-op.
|
||||
pub async fn shutdown(&self) {
|
||||
let (reply, done) = oneshot::channel();
|
||||
if self.cmd_tx.send(Cmd::Shutdown { reply }).await.is_err() {
|
||||
// The actor is already gone; it tore the link down on its way out.
|
||||
return;
|
||||
}
|
||||
let _ = done.await;
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Session and actor
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/// Boxed so the initial connection and every reconnect share one type.
|
||||
type Notifications = std::pin::Pin<
|
||||
Box<dyn Stream<Item = btleplug::api::ValueNotification> + Send>,
|
||||
>;
|
||||
|
||||
struct Session {
|
||||
peripheral: Peripheral,
|
||||
address: String,
|
||||
name: Option<String>,
|
||||
battery_percent: Option<u8>,
|
||||
measurement: Characteristic,
|
||||
}
|
||||
|
||||
/// Find the device, connect and subscribe to Heart Rate Measurement.
|
||||
async fn open_session(
|
||||
adapter: &Adapter,
|
||||
selector: &HrSelector,
|
||||
config: &HeartRateConfig,
|
||||
in_flight: &InFlight,
|
||||
) -> Result<(Session, Notifications), FtmsError> {
|
||||
// Unfiltered: an address selector must match a device whatever it
|
||||
// advertises, and some backends ignore service filters anyway.
|
||||
let peripheral = scan::find_matching(
|
||||
adapter,
|
||||
ScanKind::All,
|
||||
config.scan_timeout,
|
||||
&selector.describe(),
|
||||
|d| selector.matches(d),
|
||||
)
|
||||
.await?;
|
||||
// Cancelling past this point would otherwise strand the link (FR-1.10).
|
||||
in_flight.hold(peripheral.clone());
|
||||
|
||||
match setup_session(peripheral.clone()).await {
|
||||
Ok(session) => {
|
||||
in_flight.released();
|
||||
Ok(session)
|
||||
}
|
||||
Err(e) => {
|
||||
// A failure after `connect()` leaves a live GATT link behind, and a
|
||||
// watch in broadcast mode accepts one central — held, it will not
|
||||
// advertise for the retry, so the retry loop would never succeed.
|
||||
tracing::debug!(error = %e, "hr: session setup failed; disconnecting");
|
||||
let _ = peripheral.disconnect().await;
|
||||
in_flight.released();
|
||||
Err(e)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
async fn setup_session(peripheral: Peripheral) -> Result<(Session, Notifications), FtmsError> {
|
||||
if !peripheral.is_connected().await.unwrap_or(false) {
|
||||
peripheral.connect().await?;
|
||||
}
|
||||
peripheral.discover_services().await?;
|
||||
|
||||
let chars = peripheral.characteristics();
|
||||
// Prefer the characteristic inside the Heart Rate Service, but take a
|
||||
// bare 0x2A37 anywhere — the same leniency the FTMS client extends.
|
||||
let measurement = chars
|
||||
.iter()
|
||||
.find(|c| {
|
||||
c.uuid == uuids::HEART_RATE_MEASUREMENT
|
||||
&& c.service_uuid == uuids::HEART_RATE_SERVICE
|
||||
})
|
||||
.or_else(|| chars.iter().find(|c| c.uuid == uuids::HEART_RATE_MEASUREMENT))
|
||||
.cloned()
|
||||
.ok_or(FtmsError::MissingCharacteristic(
|
||||
"Heart Rate Measurement (0x2A37)",
|
||||
))?;
|
||||
|
||||
let notifications = peripheral.notifications().await?;
|
||||
peripheral.subscribe(&measurement).await?;
|
||||
|
||||
// Best effort, once: straps report battery, watches in broadcast mode
|
||||
// usually do not. A failure here must not cost the session.
|
||||
let battery_percent = match chars.iter().find(|c| c.uuid == uuids::BATTERY_LEVEL) {
|
||||
Some(c) => peripheral
|
||||
.read(c)
|
||||
.await
|
||||
.ok()
|
||||
.and_then(|v| v.first().copied())
|
||||
.filter(|p| *p <= 100),
|
||||
None => None,
|
||||
};
|
||||
|
||||
let described = scan::describe(&peripheral).await;
|
||||
Ok((
|
||||
Session {
|
||||
address: described
|
||||
.as_ref()
|
||||
.map(|d| d.address.clone())
|
||||
.unwrap_or_default(),
|
||||
name: described.and_then(|d| d.name),
|
||||
battery_percent,
|
||||
peripheral,
|
||||
measurement,
|
||||
},
|
||||
Box::pin(notifications),
|
||||
))
|
||||
}
|
||||
|
||||
struct Actor {
|
||||
adapter: Adapter,
|
||||
selector: HrSelector,
|
||||
config: HeartRateConfig,
|
||||
events_tx: broadcast::Sender<HeartRateEvent>,
|
||||
}
|
||||
|
||||
impl Actor {
|
||||
async fn run(
|
||||
self,
|
||||
mut cmd_rx: mpsc::Receiver<Cmd>,
|
||||
mut current: Session,
|
||||
mut notifications: Notifications,
|
||||
) {
|
||||
let mut attempt = 0u32;
|
||||
|
||||
loop {
|
||||
let dropped = tokio::select! {
|
||||
cmd = cmd_rx.recv() => {
|
||||
match cmd {
|
||||
Some(Cmd::Shutdown { reply }) => {
|
||||
self.teardown(¤t).await;
|
||||
// Answered only once the link is genuinely closed
|
||||
// (SAF-9).
|
||||
let _ = reply.send(());
|
||||
return;
|
||||
}
|
||||
None => {
|
||||
self.teardown(¤t).await;
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
frame = notifications.next() => match frame {
|
||||
Some(n) => { self.handle(n.uuid, &n.value); false }
|
||||
// The stream ending is how btleplug reports a dropped link.
|
||||
None => true,
|
||||
},
|
||||
};
|
||||
|
||||
if !dropped {
|
||||
continue;
|
||||
}
|
||||
|
||||
tracing::warn!(
|
||||
selector = %self.selector.describe(),
|
||||
"hr: notification stream ended — link dropped"
|
||||
);
|
||||
let _ = self.events_tx.send(HeartRateEvent::Disconnected);
|
||||
|
||||
// FR-1.6: reconnect with backoff. A watch that left broadcast mode
|
||||
// or a strap taken off will simply not be found, which is normal.
|
||||
loop {
|
||||
if self.config.backoff.exhausted(attempt) {
|
||||
tracing::warn!("hr: giving up after {attempt} reconnect attempts");
|
||||
// Say so before going away (FR-1.11): a silent exit strands
|
||||
// the supervisor holding a handle whose actor is gone.
|
||||
let _ = self.events_tx.send(HeartRateEvent::GaveUp { attempts: attempt });
|
||||
return;
|
||||
}
|
||||
let delay = self.config.backoff.delay(attempt);
|
||||
attempt += 1;
|
||||
|
||||
// Both the backoff and the attempt stay answerable to shutdown
|
||||
// (FR-1.10, SAF-9) — an attempt runs for up to `scan_timeout`.
|
||||
let in_flight = InFlight::default();
|
||||
let outcome = {
|
||||
let attempting = async {
|
||||
tokio::time::sleep(delay).await;
|
||||
open_session(&self.adapter, &self.selector, &self.config, &in_flight)
|
||||
.await
|
||||
};
|
||||
tokio::pin!(attempting);
|
||||
tokio::select! {
|
||||
biased;
|
||||
cmd = cmd_rx.recv() => Err(cmd),
|
||||
result = &mut attempting => Ok(result),
|
||||
}
|
||||
};
|
||||
|
||||
let result = match outcome {
|
||||
Ok(result) => result,
|
||||
Err(cmd) => {
|
||||
in_flight.abandon().await;
|
||||
if let Some(Cmd::Shutdown { reply }) = cmd {
|
||||
let _ = reply.send(());
|
||||
}
|
||||
return;
|
||||
}
|
||||
};
|
||||
|
||||
match result {
|
||||
Ok((session, stream)) => {
|
||||
let _ = self.events_tx.send(HeartRateEvent::Connected {
|
||||
address: session.address.clone(),
|
||||
name: session.name.clone(),
|
||||
battery_percent: session.battery_percent,
|
||||
});
|
||||
current = session;
|
||||
notifications = stream;
|
||||
attempt = 0;
|
||||
break;
|
||||
}
|
||||
Err(e) => tracing::debug!(error = %e, "hr: reconnect failed"),
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Decode one notification into an event.
|
||||
fn handle(&self, uuid: uuid::Uuid, raw: &[u8]) {
|
||||
if uuid != uuids::HEART_RATE_MEASUREMENT {
|
||||
tracing::trace!(%uuid, raw = %hex(raw), "hr: notification on an unexpected characteristic");
|
||||
return;
|
||||
}
|
||||
match decode_heart_rate(raw) {
|
||||
Ok(m) => {
|
||||
let _ = self.events_tx.send(HeartRateEvent::Measurement {
|
||||
bpm: m.bpm,
|
||||
sensor_contact: m.sensor_contact,
|
||||
});
|
||||
}
|
||||
// Logged, never fatal (NFR-4).
|
||||
Err(e) => tracing::debug!(raw = %hex(raw), error = %e, "hr: bad measurement frame"),
|
||||
}
|
||||
}
|
||||
|
||||
/// Close the link. Bounded: this runs on the app's exit path (NFR-9).
|
||||
async fn teardown(&self, session: &Session) {
|
||||
let unsubscribe = session.peripheral.unsubscribe(&session.measurement);
|
||||
let _ = tokio::time::timeout(DISCONNECT_TIMEOUT, unsubscribe).await;
|
||||
match tokio::time::timeout(DISCONNECT_TIMEOUT, session.peripheral.disconnect()).await {
|
||||
Ok(Ok(())) => tracing::info!("hr: disconnected"),
|
||||
Ok(Err(e)) => tracing::debug!(error = %e, "hr: disconnect failed"),
|
||||
Err(_) => tracing::warn!("hr: disconnect timed out"),
|
||||
}
|
||||
let _ = self.events_tx.send(HeartRateEvent::Disconnected);
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn a_plain_u8_measurement_decodes() {
|
||||
// Flags 0x00: u8 heart rate, no contact feature, nothing else.
|
||||
let m = decode_heart_rate(&[0x00, 142]).unwrap();
|
||||
assert_eq!(m.bpm, 142);
|
||||
assert_eq!(m.sensor_contact, None);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_u16_measurement_decodes_little_endian() {
|
||||
// Flags 0x01: u16 heart rate. 0x0121 = 289 — absurd for a human but
|
||||
// the format allows it, and the decoder is a decoder, not a referee.
|
||||
let m = decode_heart_rate(&[0x01, 0x21, 0x01]).unwrap();
|
||||
assert_eq!(m.bpm, 289);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn sensor_contact_is_three_states_not_two() {
|
||||
// Bit 2 = feature supported, bit 1 = contact detected. A strap without
|
||||
// the feature must read `None`, not "fallen off".
|
||||
assert_eq!(
|
||||
decode_heart_rate(&[0x06, 100]).unwrap().sensor_contact,
|
||||
Some(true)
|
||||
);
|
||||
assert_eq!(
|
||||
decode_heart_rate(&[0x04, 100]).unwrap().sensor_contact,
|
||||
Some(false)
|
||||
);
|
||||
assert_eq!(decode_heart_rate(&[0x00, 100]).unwrap().sensor_contact, None);
|
||||
// Bit 1 without bit 2 is "feature not supported" per the spec.
|
||||
assert_eq!(decode_heart_rate(&[0x02, 100]).unwrap().sensor_contact, None);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn trailing_fields_are_skipped_not_rejected() {
|
||||
// Flags 0x18: energy expended + RR intervals present. Real straps
|
||||
// (Garmin HRM-Dual, Polar H10) send these; the bpm must still decode.
|
||||
let m = decode_heart_rate(&[0x18, 155, 0x10, 0x00, 0x40, 0x03]).unwrap();
|
||||
assert_eq!(m.bpm, 155);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn short_frames_are_errors_not_panics() {
|
||||
// NFR-4: a malformed packet is a value, never a crash.
|
||||
assert_eq!(decode_heart_rate(&[]), Err(HrDecodeError::Empty));
|
||||
assert!(matches!(
|
||||
decode_heart_rate(&[0x00]),
|
||||
Err(HrDecodeError::TooShort { .. })
|
||||
));
|
||||
// u16 flag with only one byte of payload.
|
||||
assert!(matches!(
|
||||
decode_heart_rate(&[0x01, 142]),
|
||||
Err(HrDecodeError::TooShort { .. })
|
||||
));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn selector_any_requires_the_heart_rate_service() {
|
||||
let s = HrSelector::Any;
|
||||
assert!(s.matches_parts("aa:bb:cc:dd:ee:ff", true, ""));
|
||||
assert!(!s.matches_parts("aa:bb:cc:dd:ee:ff", false, ""));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn selector_address_ignores_the_advertisement() {
|
||||
// Reconnect runs against a device that may not be advertising its
|
||||
// services; the address alone identifies it.
|
||||
let s = HrSelector::Address("AA:BB:CC:DD:EE:FF".into());
|
||||
assert!(s.matches_parts("aa:bb:cc:dd:ee:ff", false, ""));
|
||||
assert!(!s.matches_parts("11:22:33:44:55:66", true, ""));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn selector_address_also_matches_an_opaque_platform_id() {
|
||||
// macOS gives UUID-shaped PeripheralIds rather than MACs.
|
||||
let s = HrSelector::Address("1E2F3A4B".into());
|
||||
assert!(s.matches_parts("", false, "PeripheralId(1e2f3a4b-....)"));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user