diff --git a/cmd/munin-miflora/main.go b/cmd/munin-miflora/main.go
index 4634b42..1a7dc2c 100644
--- a/cmd/munin-miflora/main.go
+++ b/cmd/munin-miflora/main.go
@@ -16,7 +16,6 @@ import (
 )
 
 const discoveryTimeout = 4 * time.Second
-const connectionTimeout = 4 * time.Second
 
 func readData(client ble.Client, profile *ble.Profile) {
 	prefix := flag.Args()[0]
diff --git a/common/ble/impl.go b/common/ble/impl.go
index bc9d4f1..94eee27 100644
--- a/common/ble/impl.go
+++ b/common/ble/impl.go
@@ -1,11 +1,10 @@
 package ble
 
 import (
-	"errors"
-
 	"miflorad/common"
 
 	"github.com/go-ble/ble"
+	"github.com/pkg/errors"
 )
 
 func FindServiceByUUID(services []*ble.Service, u ble.UUID) *ble.Service {
@@ -39,7 +38,7 @@ func RequestVersionBattery(client ble.Client, profile *ble.Profile) (common.Vers
 
 	bytes, err := client.ReadCharacteristic(mifloraVersionBatteryChar)
 	if err != nil {
-		return common.VersionBatteryResponse{}, err
+		return common.VersionBatteryResponse{}, errors.Wrap(err, "can't read version battery")
 	}
 
 	return common.ParseVersionBattery(bytes), nil
@@ -58,7 +57,7 @@ func RequestModeChange(client ble.Client, profile *ble.Profile) error {
 
 	err := client.WriteCharacteristic(mifloraModeChangeChar, common.MifloraGetModeChangeData(), false)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "can't change mode")
 	}
 
 	return nil
@@ -77,7 +76,7 @@ func RequestSensorData(client ble.Client, profile *ble.Profile) (common.SensorDa
 
 	bytes, err := client.ReadCharacteristic(mifloraSensorDataChar)
 	if err != nil {
-		return common.SensorDataResponse{}, err
+		return common.SensorDataResponse{}, errors.Wrap(err, "can't read sensor data")
 	}
 
 	return common.ParseSensorData(bytes), nil
diff --git a/common/gatt/impl.go b/common/gatt/impl.go
index 50a1d72..f991488 100644
--- a/common/gatt/impl.go
+++ b/common/gatt/impl.go
@@ -1,11 +1,10 @@
 package gatt
 
 import (
-	"errors"
-
 	"miflorad/common"
 
 	"github.com/currantlabs/gatt"
+	"github.com/pkg/errors"
 )
 
 var MifloraCharVersionBatteryUUID = gatt.MustParseUUID("00001a02-0000-1000-8000-00805f9b34fb")
@@ -41,7 +40,7 @@ func MifloraRequestVersionBattery(p gatt.Peripheral) (common.VersionBatteryRespo
 
 	bytes, err := p.ReadCharacteristic(mifloraVersionBatteryChar)
 	if err != nil {
-		return common.VersionBatteryResponse{}, err
+		return common.VersionBatteryResponse{}, errors.Wrap(err, "can't read version battery")
 	}
 
 	return common.ParseVersionBattery(bytes), nil
@@ -60,7 +59,7 @@ func MifloraRequestModeChange(p gatt.Peripheral) error {
 
 	err := p.WriteCharacteristic(mifloraModeChangeChar, common.MifloraGetModeChangeData(), false)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "can't change mode")
 	}
 
 	return nil
@@ -79,7 +78,7 @@ func MifloraRequstSensorData(p gatt.Peripheral) (common.SensorDataResponse, erro
 
 	bytes, err := p.ReadCharacteristic(mifloraSensorDataChar)
 	if err != nil {
-		return common.SensorDataResponse{}, err
+		return common.SensorDataResponse{}, errors.Wrap(err, "can't read sensor data")
 	}
 
 	return common.ParseSensorData(bytes), nil
diff --git a/go.mod b/go.mod
index d7eb902..610aede 100644
--- a/go.mod
+++ b/go.mod
@@ -12,7 +12,7 @@ require (
 	github.com/mgutz/logxi v0.0.0-20161027140823-aebf8a7d67ab // indirect
 	github.com/muka/ble v0.0.0-20180314094923-5613a57406d1 // indirect
 	github.com/muka/go-bluetooth v0.0.0-20181012115104-31d8f53bf9a1
-	github.com/pkg/errors v0.8.0 // indirect
+	github.com/pkg/errors v0.8.0
 	github.com/sirupsen/logrus v1.2.0 // indirect
 	github.com/stretchr/testify v1.2.2
 )