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Jan 9, 2025
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examples: improve heartrate example by adding all required characteristics for profile #321

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26 changes: 22 additions & 4 deletions examples/heartrate/main.go
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
// this example implements a BLE heart rate sensor.
// see https://www.bluetooth.com/specifications/specs/heart-rate-profile-1-0/ for the full spec.
package main

import (
Expand All @@ -7,10 +9,15 @@ import (
"tinygo.org/x/bluetooth"
)

var adapter = bluetooth.DefaultAdapter
var (
adapter = bluetooth.DefaultAdapter

// TODO: use atomics to access this value.
var heartRate uint8 = 75 // 75bpm
heartRateMeasurement bluetooth.Characteristic
bodyLocation bluetooth.Characteristic
controlPoint bluetooth.Characteristic

heartRate uint8 = 75 // 75bpm
)

func main() {
println("starting")
Expand All @@ -22,7 +29,6 @@ func main() {
}))
must("start adv", adv.Start())

var heartRateMeasurement bluetooth.Characteristic
must("add service", adapter.AddService(&bluetooth.Service{
UUID: bluetooth.ServiceUUIDHeartRate,
Characteristics: []bluetooth.CharacteristicConfig{
Expand All @@ -32,6 +38,18 @@ func main() {
Value: []byte{0, heartRate},
Flags: bluetooth.CharacteristicNotifyPermission,
},
{
Handle: &bodyLocation,
UUID: bluetooth.CharacteristicUUIDBodySensorLocation,
Value: []byte{1}, // "Chest"
Flags: bluetooth.CharacteristicReadPermission,
},
{
Handle: &controlPoint,
UUID: bluetooth.CharacteristicUUIDHeartRateControlPoint,
Value: []byte{0},
Flags: bluetooth.CharacteristicWritePermission,
},
},
}))

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