munin-miflora: refactor into two implementations using go-ble and gatt libraries, have common package

common/ble/impl.go

@@ -0,0 +1,84 @@
+package ble
+
+import (
+	"errors"
+
+	"miflorad/common"
+
+	"github.com/go-ble/ble"
+)
+
+func FindServiceByUUID(services []*ble.Service, u ble.UUID) *ble.Service {
+	for _, service := range services {
+		if service.UUID.Equal(u) {
+			return service
+		}
+	}
+	return nil
+}
+
+func FindCharacteristicByUUID(characteristics []*ble.Characteristic, u ble.UUID) *ble.Characteristic {
+	for _, characteristic := range characteristics {
+		if characteristic.UUID.Equal(u) {
+			return characteristic
+		}
+	}
+	return nil
+}
+
+func RequestVersionBattery(client ble.Client, profile *ble.Profile) (common.VersionBatteryResponse, error) {
+	mifloraService := FindServiceByUUID(profile.Services, ble.MustParse(common.MifloraServiceUUID))
+	if mifloraService == nil {
+		return common.VersionBatteryResponse{}, errors.New("Failed to get the miflora service")
+	}
+
+	mifloraVersionBatteryChar := FindCharacteristicByUUID(mifloraService.Characteristics, ble.MustParse(common.MifloraCharVersionBatteryUUID))
+	if mifloraVersionBatteryChar == nil {
+		return common.VersionBatteryResponse{}, errors.New("Failed to get the version battery characteristic")
+	}
+
+	bytes, err := client.ReadCharacteristic(mifloraVersionBatteryChar)
+	if err != nil {
+		return common.VersionBatteryResponse{}, err
+	}
+
+	return common.ParseVersionBattery(bytes), nil
+}
+
+func RequestModeChange(client ble.Client, profile *ble.Profile) error {
+	mifloraService := FindServiceByUUID(profile.Services, ble.MustParse(common.MifloraServiceUUID))
+	if mifloraService == nil {
+		return errors.New("Failed to get the miflora service")
+	}
+
+	mifloraModeChangeChar := FindCharacteristicByUUID(mifloraService.Characteristics, ble.MustParse(common.MifloraCharModeChangeUUID))
+	if mifloraModeChangeChar == nil {
+		return errors.New("Failed to discover the mode change characteristic")
+	}
+
+	err := client.WriteCharacteristic(mifloraModeChangeChar, common.MifloraGetModeChangeData(), false)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func RequestSensorData(client ble.Client, profile *ble.Profile) (common.SensorDataResponse, error) {
+	mifloraService := FindServiceByUUID(profile.Services, ble.MustParse(common.MifloraServiceUUID))
+	if mifloraService == nil {
+		return common.SensorDataResponse{}, errors.New("Failed to get the miflora service")
+	}
+
+	mifloraSensorDataChar := FindCharacteristicByUUID(mifloraService.Characteristics, ble.MustParse(common.MifloraCharReadSensorDataUUID))
+	if mifloraSensorDataChar == nil {
+		return common.SensorDataResponse{}, errors.New("Failed to discover the sensor data characteristic")
+	}
+
+	bytes, err := client.ReadCharacteristic(mifloraSensorDataChar)
+	if err != nil {
+		return common.SensorDataResponse{}, err
+	}
+
+	return common.ParseSensorData(bytes), nil
+}