diff --git a/.gitignore b/.gitignore
index 2a775a7..97c9753 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
 testing/
-.vscode/launch.json
\ No newline at end of file
+.vscode/launch.json
diff --git a/app.go b/app.go
index e7db2fe..907b63a 100644
--- a/app.go
+++ b/app.go
@@ -2,8 +2,9 @@ package gomeassistant
 
 import (
 	"context"
+	"errors"
 	"fmt"
-	"log"
+	"log/slog"
 	"time"
 
 	"github.com/golang-module/carbon"
@@ -18,6 +19,8 @@ import (
 // Returned by NewApp() if authentication fails
 var ErrInvalidToken = ws.ErrInvalidToken
 
+var ErrInvalidArgs = errors.New("invalid arguments provided")
+
 type App struct {
 	ctx       context.Context
 	ctxCancel context.CancelFunc
@@ -82,7 +85,8 @@ you can use to register schedules and listeners.
 */
 func NewApp(request NewAppRequest) (*App, error) {
 	if request.IpAddress == "" || request.HAAuthToken == "" || request.HomeZoneEntityId == "" {
-		log.Fatalln("IpAddress, HAAuthToken, and HomeZoneEntityId are all required arguments in NewAppRequest.")
+		slog.Error("IpAddress, HAAuthToken, and HomeZoneEntityId are all required arguments in NewAppRequest")
+		return nil, ErrInvalidArgs
 	}
 	port := request.Port
 	if port == "" {
@@ -149,7 +153,8 @@ func (a *App) RegisterSchedules(schedules ...DailySchedule) {
 func (a *App) RegisterIntervals(intervals ...Interval) {
 	for _, i := range intervals {
 		if i.frequency == 0 {
-			log.Fatalf("A schedule must use either set frequency via Every().\n")
+			slog.Error("A schedule must use either set frequency via Every()")
+			panic(ErrInvalidArgs)
 		}
 
 		i.nextRunTime = internal.ParseTime(string(i.startTime)).Carbon2Time()
@@ -165,7 +170,8 @@ func (a *App) RegisterEntityListeners(etls ...EntityListener) {
 	for _, etl := range etls {
 		etl := etl
 		if etl.delay != 0 && etl.toState == "" {
-			log.Fatalln("EntityListener error: you have to use ToState() when using Duration()")
+			slog.Error("EntityListener error: you have to use ToState() when using Duration()")
+			panic(ErrInvalidArgs)
 		}
 
 		for _, entity := range etl.entityIds {
@@ -211,7 +217,9 @@ func getSunriseSunset(s *StateImpl, sunrise bool, dateToUse carbon.Carbon, offse
 	if len(offset) == 1 {
 		t, err = time.ParseDuration(string(offset[0]))
 		if err != nil {
-			log.Fatalf(fmt.Sprintf("Could not parse offset passed to %s: \"%s\"\n", printString, offset[0]))
+			parsingErr := fmt.Errorf("could not parse offset passed to %s: \"%s\": %w", printString, offset[0], err)
+			slog.Error(parsingErr.Error())
+			panic(parsingErr)
 		}
 	}
 
@@ -234,9 +242,9 @@ func getNextSunRiseOrSet(a *App, sunrise bool, offset ...DurationString) carbon.
 }
 
 func (a *App) Start() {
-	log.Default().Println("Starting", a.schedules.Len(), "schedules")
-	log.Default().Println("Starting", len(a.entityListeners), "entity listeners")
-	log.Default().Println("Starting", len(a.eventListeners), "event listeners")
+	slog.Info("Starting", "schedules", a.schedules.Len())
+	slog.Info("Starting", "entity listeners", len(a.entityListeners))
+	slog.Info("Starting", "event listeners", len(a.eventListeners))
 
 	go runSchedules(a)
 	go runIntervals(a)
@@ -254,7 +262,7 @@ func (a *App) Start() {
 			if etl.runOnStartup && !etl.runOnStartupCompleted {
 				entityState, err := a.state.Get(eid)
 				if err != nil {
-					log.Default().Println("Failed to get entity state \"", eid, "\" during startup, skipping RunOnStartup")
+					slog.Warn("Failed to get entity state \"", eid, "\" during startup, skipping RunOnStartup")
 				}
 
 				etl.runOnStartupCompleted = true
diff --git a/example/example.go b/example/example.go
index fa5dc74..6d77d46 100644
--- a/example/example.go
+++ b/example/example.go
@@ -2,7 +2,7 @@ package example
 
 import (
 	"encoding/json"
-	"log"
+	"log/slog"
 	"os"
 	"time"
 
@@ -16,7 +16,8 @@ func main() {
 		HomeZoneEntityId: "zone.home",
 	})
 	if err != nil {
-		log.Fatalln("Error connecting to HASS:", err)
+		slog.Error("Error connecting to HASS:", err)
+		os.Exit(1)
 	}
 
 	defer app.Cleanup()
@@ -69,7 +70,7 @@ func onEvent(service *ga.Service, state ga.State, data ga.EventData) {
 	// the eventTypes.go file :)
 	ev := ga.EventZWaveJSValueNotification{}
 	json.Unmarshal(data.RawEventJSON, &ev)
-	log.Default().Println(ev)
+	slog.Info("On event invoked", "event", ev)
 }
 
 func lightsOut(service *ga.Service, state ga.State) {
@@ -77,7 +78,7 @@ func lightsOut(service *ga.Service, state ga.State) {
 	service.Light.TurnOff("light.outside_lights")
 	s, err := state.Get("binary_sensor.living_room_motion")
 	if err != nil {
-		log.Default().Println("couldnt get living room motion state, doing nothing")
+		slog.Warn("couldnt get living room motion state, doing nothing")
 		return
 	}
 
diff --git a/example/example_live_test.go b/example/example_live_test.go
index e88611b..e636a22 100644
--- a/example/example_live_test.go
+++ b/example/example_live_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/golang-cz/devslog"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/suite"
 	"gopkg.in/yaml.v3"
@@ -33,7 +34,20 @@ type (
 	}
 )
 
+func setupLogging() {
+	opts := &devslog.Options{
+		HandlerOptions: &slog.HandlerOptions{
+			Level:     slog.LevelDebug,
+			AddSource: true,
+		},
+		NewLineAfterLog: true,
+	}
+	slog.SetDefault(slog.New(devslog.NewHandler(os.Stdout, opts)))
+}
+
 func (s *MySuite) SetupSuite() {
+	setupLogging()
+	slog.Debug("Setting up test suite...")
 	s.suiteCtx = make(map[string]any)
 
 	configFile, err := os.ReadFile("./config.yaml")
@@ -44,7 +58,7 @@ func (s *MySuite) SetupSuite() {
 	// either env var or config file can be used to set HA auth. token
 	s.config.Hass.HAAuthToken = os.Getenv("HA_AUTH_TOKEN")
 	if err := yaml.Unmarshal(configFile, s.config); err != nil {
-		slog.Error("Error unmarshalling config file:", err)
+		slog.Error("Error unmarshalling config file", err)
 	}
 
 	s.app, err = ga.NewApp(ga.NewAppRequest{
@@ -53,17 +67,25 @@ func (s *MySuite) SetupSuite() {
 		HomeZoneEntityId: s.config.Hass.HomeZoneEntityId,
 	})
 	if err != nil {
-		slog.Error("Failed to createw new app:", err)
+		slog.Error("Failed to createw new app", err)
 		s.T().FailNow()
 	}
 
+	// Register all automations
 	entityId := s.config.Entities.LightEntityId
 	if entityId != "" {
 		s.suiteCtx["entityCallbackInvoked"] = false
 		etl := ga.NewEntityListener().EntityIds(entityId).Call(s.entityCallback).Build()
 		s.app.RegisterEntityListeners(etl)
-		go s.app.Start()
 	}
+
+	s.suiteCtx["dailyScheduleCallbackInvoked"] = false
+	runTime := time.Now().Add(1 * time.Minute).Format("15:04")
+	dailySchedule := ga.NewDailySchedule().Call(s.dailyScheduleCallback).At(runTime).Build()
+	s.app.RegisterSchedules(dailySchedule)
+
+	// start GA app
+	go s.app.Start()
 }
 
 func (s *MySuite) TearDownSuite() {
@@ -91,19 +113,32 @@ func (s *MySuite) TestLightService() {
 	}
 }
 
-// Test if event has been captured after light entity state changed
+// Basic test of daily schedule and callback
+func (s *MySuite) TestSchedule() {
+	assert.EventuallyWithT(s.T(), func(c *assert.CollectT) {
+		assert.True(c, s.suiteCtx["dailyScheduleCallbackInvoked"].(bool))
+	}, 2*time.Minute, 1*time.Second, "Daily schedule callback was not invoked")
+}
+
+// Capture event after light entity state has changed
 func (s *MySuite) entityCallback(se *ga.Service, st ga.State, e ga.EntityData) {
-	slog.Info("Entity callback called.", "entity id:", e.TriggerEntityId, "from state:", e.FromState, "to state:", e.ToState)
+	slog.Info("Entity callback called.", "entity id", e.TriggerEntityId, "from state", e.FromState, "to state", e.ToState)
 	s.suiteCtx["entityCallbackInvoked"] = true
 }
 
+// Capture planned daily schedule
+func (s *MySuite) dailyScheduleCallback(se *ga.Service, st ga.State) {
+	slog.Info("Daily schedule callback called.")
+	s.suiteCtx["dailyScheduleCallbackInvoked"] = true
+}
+
 func getEntityState(s *MySuite, entityId string) string {
 	state, err := s.app.GetState().Get(entityId)
 	if err != nil {
-		slog.Error("Error getting entity state:", err)
+		slog.Error("Error getting entity state", err)
 		s.T().FailNow()
 	}
-	slog.Info("State of entity:", "state", state.State)
+	slog.Info("State of entity", "state", state.State)
 	return state.State
 }
 
diff --git a/example/go.mod b/example/go.mod
index 95813bf..49184a0 100644
--- a/example/go.mod
+++ b/example/go.mod
@@ -1,8 +1,9 @@
 module example
 
-go 1.21.0
+go 1.21
 
 require (
+	github.com/golang-cz/devslog v0.0.8
 	github.com/stretchr/testify v1.8.4
 	gopkg.in/yaml.v3 v3.0.1
 	saml.dev/gome-assistant v0.2.0
diff --git a/example/go.sum b/example/go.sum
new file mode 100644
index 0000000..232d6d1
--- /dev/null
+++ b/example/go.sum
@@ -0,0 +1,100 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
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+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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+golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/mod v0.9.0 h1:KENHtAZL2y3NLMYZeHY9DW8HW8V+kQyJsY/V9JlKvCs=
+golang.org/x/mod v0.9.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190515120540-06a5c4944438/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190624180213-70d37148ca0c/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+saml.dev/gome-assistant v0.2.0 h1:Clo5DrziTdsYydVUTQfroeBVmToMnNHoObr+k6HhbMY=
+saml.dev/gome-assistant v0.2.0/go.mod h1:jsZUtnxANCP0zB2B7iyy4j7sZohMGop8g+5EB2MER3o=
diff --git a/go.mod b/go.mod
index e4a89fe..4c9b4d1 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module saml.dev/gome-assistant
 
-go 1.19
+go 1.21
 
 require (
 	github.com/golang-module/carbon v1.7.1
diff --git a/internal/internal.go b/internal/internal.go
index f8c752d..f5efc14 100644
--- a/internal/internal.go
+++ b/internal/internal.go
@@ -2,7 +2,7 @@ package internal
 
 import (
 	"fmt"
-	"log"
+	"log/slog"
 	"reflect"
 	"runtime"
 	"time"
@@ -27,7 +27,9 @@ func GetId() int64 {
 func ParseTime(s string) carbon.Carbon {
 	t, err := time.Parse("15:04", s)
 	if err != nil {
-		log.Fatalf("Failed to parse time string \"%s\"; format must be HH:MM.\n", s)
+		parsingErr := fmt.Errorf("failed to parse time string \"%s\"; format must be HH:MM.: %w", s, err)
+		slog.Error(parsingErr.Error())
+		panic(parsingErr)
 	}
 	return carbon.Now().SetTimeMilli(t.Hour(), t.Minute(), 0, 0)
 }
@@ -35,7 +37,9 @@ func ParseTime(s string) carbon.Carbon {
 func ParseDuration(s string) time.Duration {
 	d, err := time.ParseDuration(s)
 	if err != nil {
-		log.Fatalf(fmt.Sprintf("Couldn't parse string duration: \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units\n", s))
+		parsingErr := fmt.Errorf("couldn't parse string duration: \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units: %w", s, err)
+		slog.Error(parsingErr.Error())
+		panic(parsingErr)
 	}
 	return d
 }
diff --git a/internal/websocket/reader.go b/internal/websocket/reader.go
index 95977cb..6ac4640 100644
--- a/internal/websocket/reader.go
+++ b/internal/websocket/reader.go
@@ -3,8 +3,7 @@ package websocket
 import (
 	"context"
 	"encoding/json"
-	"fmt"
-	"log"
+	"log/slog"
 
 	"github.com/gorilla/websocket"
 )
@@ -25,9 +24,8 @@ type ChanMsg struct {
 func ListenWebsocket(conn *websocket.Conn, ctx context.Context, c chan ChanMsg) {
 	for {
 		bytes, err := ReadMessage(conn, ctx)
-
 		if err != nil {
-			log.Default().Println("Error reading from websocket:", err)
+			slog.Error("Error reading from websocket:", err)
 			close(c)
 			break
 		}
@@ -38,7 +36,7 @@ func ListenWebsocket(conn *websocket.Conn, ctx context.Context, c chan ChanMsg)
 		}
 		json.Unmarshal(bytes, &base)
 		if !base.Success {
-			fmt.Println("WARNING: received unsuccessful response:", string(bytes))
+			slog.Warn("Received unsuccessful response", "response", string(bytes))
 		}
 		chanMsg := ChanMsg{
 			Type:    base.Type,
diff --git a/internal/websocket/websocket.go b/internal/websocket/websocket.go
index f8c81ec..70bf7c4 100644
--- a/internal/websocket/websocket.go
+++ b/internal/websocket/websocket.go
@@ -9,7 +9,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"log"
+	"log/slog"
 	"sync"
 	"time"
 
@@ -17,9 +17,7 @@ import (
 	i "saml.dev/gome-assistant/internal"
 )
 
-var (
-	ErrInvalidToken = errors.New("invalid authentication token")
-)
+var ErrInvalidToken = errors.New("invalid authentication token")
 
 type AuthMessage struct {
 	MsgType     string `json:"type"`
@@ -59,7 +57,7 @@ func SetupConnection(ip, port, authToken string) (*websocket.Conn, context.Conte
 	conn, _, err := dialer.DialContext(ctx, fmt.Sprintf("ws://%s:%s/api/websocket", ip, port), nil)
 	if err != nil {
 		ctxCancel()
-		log.Printf("ERROR: Failed to connect to websocket at ws://%s:%s/api/websocket. Check IP address and port\n", ip, port)
+		slog.Error("Failed to connect to websocket at ws://%s:%s/api/websocket. Check IP address and port\n", ip, port)
 		return nil, nil, nil, err
 	}
 
@@ -67,7 +65,7 @@ func SetupConnection(ip, port, authToken string) (*websocket.Conn, context.Conte
 	_, err = ReadMessage(conn, ctx)
 	if err != nil {
 		ctxCancel()
-		log.Printf("Unknown error creating websocket client\n")
+		slog.Error("Unknown error creating websocket client\n")
 		return nil, nil, nil, err
 	}
 
@@ -75,7 +73,7 @@ func SetupConnection(ip, port, authToken string) (*websocket.Conn, context.Conte
 	err = SendAuthMessage(conn, ctx, authToken)
 	if err != nil {
 		ctxCancel()
-		log.Printf("Unknown error creating websocket client\n")
+		slog.Error("Unknown error creating websocket client\n")
 		return nil, nil, nil, err
 	}
 
@@ -83,7 +81,7 @@ func SetupConnection(ip, port, authToken string) (*websocket.Conn, context.Conte
 	err = VerifyAuthResponse(conn, ctx)
 	if err != nil {
 		ctxCancel()
-		log.Printf("ERROR: Auth token is invalid. Please double check it or create a new token in your Home Assistant profile\n")
+		slog.Error("Auth token is invalid. Please double check it or create a new token in your Home Assistant profile\n")
 		return nil, nil, nil, err
 	}
 
@@ -143,7 +141,9 @@ func SubscribeToEventType(eventType string, conn *WebsocketWriter, ctx context.C
 	}
 	err := conn.WriteMessage(e, ctx)
 	if err != nil {
-		log.Fatalf("Error writing to websocket: %s\n", err)
+		wrappedErr := fmt.Errorf("error writing to websocket: %w", err)
+		slog.Error(wrappedErr.Error())
+		panic(wrappedErr)
 	}
 	// m, _ := ReadMessage(conn, ctx)
 	// log.Default().Println(string(m))
diff --git a/schedule.go b/schedule.go
index 2325890..77a26d5 100644
--- a/schedule.go
+++ b/schedule.go
@@ -2,7 +2,7 @@ package gomeassistant
 
 import (
 	"fmt"
-	"log"
+	"log/slog"
 	"time"
 
 	"github.com/golang-module/carbon"
@@ -168,7 +168,7 @@ func runSchedules(a *App) {
 			sched = popSchedule(a)
 		}
 
-		log.Println("Next schedule:", sched.nextRunTime)
+		slog.Info("Next schedule", "start_time", sched.nextRunTime)
 		time.Sleep(time.Until(sched.nextRunTime))
 		sched.maybeRunCallback(a)
 		requeueSchedule(a, sched)