forked from muka/go-bluetooth
/
humidity.go
226 lines (187 loc) · 4.34 KB
/
humidity.go
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package sensortag
import (
"bytes"
"encoding/binary"
"errors"
"github.com/muka/go-bluetooth/bluez/profile/gatt"
)
//getting config,data,period characteristics for Humidity sensor
func newHumiditySensor(tag *SensorTag) (*HumiditySensor, error) {
dev := tag.Device1
HumidityConfigUUID, err := getUUID("HumidityConfig")
if err != nil {
return nil, err
}
HumidityDataUUID, err := getUUID("HumidityData")
if err != nil {
return nil, err
}
HumidityPeriodUUID, err := getUUID("HumidityPeriod")
if err != nil {
return nil, err
}
i, err := retryCall(DefaultRetry, DefaultRetryWait, func() (interface{}, error) {
cfg, err := dev.GetCharByUUID(HumidityConfigUUID)
if err != nil {
return nil, err
}
data, err := dev.GetCharByUUID(HumidityDataUUID)
if err != nil {
return nil, err
}
if data == nil {
return nil, errors.New("Cannot find HumidityData characteristic " + HumidityDataUUID)
}
period, err := dev.GetCharByUUID(HumidityPeriodUUID)
if err != nil {
return nil, err
}
if period == nil {
return nil, errors.New("Cannot find HumidityPeriod characteristic " + HumidityPeriodUUID)
}
return &HumiditySensor{tag, cfg, data, period}, err
})
return i.(*HumiditySensor), err
}
//HumiditySensor struct
type HumiditySensor struct {
tag *SensorTag
cfg *gatt.GattCharacteristic1
data *gatt.GattCharacteristic1
period *gatt.GattCharacteristic1
}
//GetName return the sensor name
func (s HumiditySensor) GetName() string {
return "humidity"
}
//Enable humidity measurements
func (s *HumiditySensor) Enable() error {
enabled, err := s.IsEnabled()
if err != nil {
return err
}
if enabled {
return nil
}
options := getOptions()
err = s.cfg.WriteValue([]byte{1}, options)
if err != nil {
return err
}
return nil
}
//Disable humidity measurements
func (s *HumiditySensor) Disable() error {
enabled, err := s.IsEnabled()
if err != nil {
return err
}
if !enabled {
return nil
}
options := make(map[string]interface{})
err = s.cfg.WriteValue([]byte{0}, options)
if err != nil {
return err
}
return nil
}
// IsEnabled check if humidity measurements are enabled
func (s *HumiditySensor) IsEnabled() (bool, error) {
options := make(map[string]interface{})
val, err := s.cfg.ReadValue(options)
if err != nil {
return false, err
}
buf := bytes.NewBuffer(val)
enabled, err := binary.ReadVarint(buf)
if err != nil {
return false, err
}
return (enabled == 1), nil
}
//IsNotifying check if humidity sensor is notyfing
func (s *HumiditySensor) IsNotifying() (bool, error) {
n, err := s.data.GetProperty("Notifying")
if err != nil {
return false, err
}
return n.Value().(bool), nil
}
//Read value from the humidity sensor
func (s *HumiditySensor) Read() (float64, error) {
err := s.Enable()
if err != nil {
return 0, err
}
options := make(map[string]interface{})
b, err := s.data.ReadValue(options)
if err != nil {
return 0, err
}
humid := binary.LittleEndian.Uint16(b[2:])
humidValue := calcHumidLocal(uint16(humid))
return humidValue, err
}
//StartNotify enable DataChannel for humidity
func (s *HumiditySensor) StartNotify() error {
err := s.Enable()
if err != nil {
return err
}
dataChannel, err := s.data.WatchProperties()
if err != nil {
return err
}
go func() {
for prop := range dataChannel {
if prop == nil {
return
}
if prop.Name != "Value" {
return
}
b1 := prop.Value.([]byte)
humid := binary.LittleEndian.Uint16(b1[2:])
humidityValue := calcHumidLocal(uint16(humid))
temperature := binary.LittleEndian.Uint16(b1[0:2])
tempValue := calcTmpFromHumidSensor(uint16(temperature))
dataEvent := SensorTagDataEvent{
Device: s.tag.Device1,
SensorType: "humidity",
HumidityValue: humidityValue,
HumidityUnit: "%RH",
HumidityTempValue: tempValue,
HumidityTempUnit: "C",
SensorID: s.tag.Properties.Address,
}
s.tag.Data() <- &dataEvent
}
}()
n, err := s.IsNotifying()
if err != nil {
return err
}
if !n {
return s.data.StartNotify()
}
return nil
}
//StopNotify disable DataChannel for humidity sensor
func (s *HumiditySensor) StopNotify() error {
err := s.Disable()
if err != nil {
return err
}
if dataChannel != nil {
close(dataChannel)
}
n, err := s.IsNotifying()
if err != nil {
return err
}
if n {
return s.data.StopNotify()
}
return nil
}