Add weather service

infinitime.go

@@ -4,9 +4,11 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
+	"reflect"
 	"strings"
 	"time"
 
+	"github.com/fxamacker/cbor/v2"
 	bt "github.com/muka/go-bluetooth/api"
 	"github.com/muka/go-bluetooth/bluez/profile/adapter"
 	"github.com/muka/go-bluetooth/bluez/profile/device"
@@ -27,6 +29,7 @@ const (
 	HeartRateChar   = "00002a37-0000-1000-8000-00805f9b34fb"
 	FSTransferChar  = "adaf0200-4669-6c65-5472-616e73666572"
 	FSVersionChar   = "adaf0100-4669-6c65-5472-616e73666572"
+	WeatherDataChar = "00040001-78fc-48fe-8e23-433b3a1942d0"
 )
 
 type Device struct {
@@ -42,6 +45,7 @@ type Device struct {
 	heartRateChar   *gatt.GattCharacteristic1
 	fsVersionChar   *gatt.GattCharacteristic1
 	fsTransferChar  *gatt.GattCharacteristic1
+	weatherDataChar *gatt.GattCharacteristic1
 	notifEventCh    chan uint8
 	notifEventDone  bool
 	onReconnect     func()
@@ -50,10 +54,11 @@ type Device struct {
 }
 
 var (
-	ErrNoDevices    = errors.New("no InfiniTime devices found")
-	ErrNotFound     = errors.New("could not find any advertising InfiniTime devices")
-	ErrNotConnected = errors.New("not connected")
-	ErrCharNotAvail = errors.New("required characteristic is not available")
+	ErrNoDevices        = errors.New("no InfiniTime devices found")
+	ErrNotFound         = errors.New("could not find any advertising InfiniTime devices")
+	ErrNotConnected     = errors.New("not connected")
+	ErrCharNotAvail     = errors.New("required characteristic is not available")
+	ErrNoTimelineHeader = errors.New("events must contain the timeline header")
 )
 
 type Options struct {
@@ -333,6 +338,8 @@ func (i *Device) resolveChars() error {
 			i.fsTransferChar = char
 		case FSVersionChar:
 			i.fsVersionChar = char
+		case WeatherDataChar:
+			i.weatherDataChar = char
 		}
 	}
 	return nil
@@ -685,6 +692,32 @@ func (i *Device) FS() (*blefs.FS, error) {
 	return blefs.New(i.fsTransferChar)
 }
 
+// AddWeatherEvent adds one of the event structs from
+// the weather package to the timeline. Input must be
+// a struct containing TimelineHeader.
+func (i *Device) AddWeatherEvent(event interface{}) error {
+	if err := i.checkStatus(i.weatherDataChar); err != nil {
+		return err
+	}
+	// Get type of input
+	inputType := reflect.TypeOf(event)
+	// Check if input contains TimelineHeader
+	_, hdrExists := inputType.FieldByName("TimelineHeader")
+	// If header does not exist or input is not struct
+	if !hdrExists || inputType.Kind() != reflect.Struct {
+		return ErrNoTimelineHeader
+	}
+
+	// Encode event as CBOR
+	data, err := cbor.Marshal(event)
+	if err != nil {
+		return err
+	}
+
+	// Write data to weather data characteristic
+	return i.weatherDataChar.WriteValue(data, nil)
+}
+
 func (i *Device) checkStatus(char *gatt.GattCharacteristic1) error {
 	if !i.device.Properties.Connected {
 		return ErrNotConnected