diff --git a/cmd/main/testing.go b/cmd/main/testing.go
index dd32751..b6bd420 100644
--- a/cmd/main/testing.go
+++ b/cmd/main/testing.go
@@ -24,8 +24,8 @@ func main() {
 	log.Println(s2)
 }
 
-func lightsOut(service ga.Service, state ga.State) {
-	// ga.TurnOff("light.all_lights")
+func lightsOut(service *ga.Service, state *ga.State) {
+	service.HomeAssistant.Toggle("light.office_ceiling_lights")
 }
 
 func cool(service ga.Service, data ga.Data) {
diff --git a/internal/services/builder.go b/internal/services/builder.go
index ee30859..bceb4e4 100644
--- a/internal/services/builder.go
+++ b/internal/services/builder.go
@@ -3,9 +3,30 @@ package services
 import (
 	"context"
 
+	"github.com/saml-dev/gome-assistant/internal/http"
 	"nhooyr.io/websocket"
 )
 
-func BuildService[T Light | HomeAssistant](conn *websocket.Conn, ctx context.Context) *T {
-	return &T{conn: conn, ctx: ctx}
+func BuildService[T Light | HomeAssistant](conn *websocket.Conn, ctx context.Context, httpClient *http.HttpClient) *T {
+	return &T{conn: conn, ctx: ctx, httpClient: httpClient}
+}
+
+type BaseServiceRequest struct {
+	Id          int            `json:"id"`
+	RequestType string         `json:"type"` // hardcoded "call_service"
+	Domain      string         `json:"domain"`
+	Service     string         `json:"service"`
+	ServiceData map[string]any `json:"service_data,omitempty"`
+	Target      struct {
+		EntityId string `json:"entity_id"`
+	} `json:"target"`
+}
+
+func NewBaseServiceRequest(entityId string) BaseServiceRequest {
+	bsr := BaseServiceRequest{
+		Id:          10,
+		RequestType: "call_service",
+	}
+	bsr.Target.EntityId = entityId
+	return bsr
 }
diff --git a/internal/services/homeassistant.go b/internal/services/homeassistant.go
index a9cd7b9..16d438b 100644
--- a/internal/services/homeassistant.go
+++ b/internal/services/homeassistant.go
@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"github.com/saml-dev/gome-assistant/internal/http"
+	ws "github.com/saml-dev/gome-assistant/internal/websocket"
 	"nhooyr.io/websocket"
 )
 
@@ -13,6 +14,26 @@ type HomeAssistant struct {
 	httpClient *http.HttpClient
 }
 
-// TODO: design how much reuse I can get between request types. E.g.
-// only difference between light.turnon and homeassistant.turnon is
-// domain and extra data
+func (ha *HomeAssistant) TurnOn(entityId string) {
+	req := NewBaseServiceRequest(entityId)
+	req.Domain = "homeassistant"
+	req.Service = "turn_on"
+
+	ws.WriteMessage(req, ha.conn, ha.ctx)
+}
+
+func (ha *HomeAssistant) TurnOff(entityId string) {
+	req := NewBaseServiceRequest(entityId)
+	req.Domain = "homeassistant"
+	req.Service = "turn_off"
+
+	ws.WriteMessage(req, ha.conn, ha.ctx)
+}
+
+func (ha *HomeAssistant) Toggle(entityId string) {
+	req := NewBaseServiceRequest(entityId)
+	req.Domain = "homeassistant"
+	req.Service = "toggle"
+
+	ws.WriteMessage(req, ha.conn, ha.ctx)
+}
diff --git a/internal/websocket/websocket.go b/internal/websocket/websocket.go
index 984cf22..ff05482 100644
--- a/internal/websocket/websocket.go
+++ b/internal/websocket/websocket.go
@@ -23,7 +23,7 @@ type AuthMessage struct {
 
 func WriteMessage[T any](msg T, conn *websocket.Conn, ctx context.Context) error {
 	msgJson, err := json.Marshal(msg)
-	// fmt.Println(string(msgJson))
+	fmt.Println(string(msgJson))
 	if err != nil {
 		return err
 	}
@@ -100,6 +100,7 @@ func VerifyAuthResponse(conn *websocket.Conn, ctx context.Context) error {
 
 	var authResp authResponse
 	json.Unmarshal(msg, &authResp)
+	log.Println(authResp.MsgType)
 	if authResp.MsgType != "auth_ok" {
 		return errors.New("invalid auth token")
 	}
diff --git a/schedule.go b/schedule.go
index b6063a2..4a6aff7 100644
--- a/schedule.go
+++ b/schedule.go
@@ -62,7 +62,7 @@ func Duration(hour, minute int) time.Duration {
 	return TimeOfDay(hour, minute)
 }
 
-type scheduleCallback func(Service, State)
+type scheduleCallback func(*Service, *State)
 
 type schedule struct {
 	/*
diff --git a/service.go b/service.go
index 6717823..e9122b2 100644
--- a/service.go
+++ b/service.go
@@ -15,7 +15,7 @@ type Service struct {
 
 func NewService(conn *websocket.Conn, ctx context.Context, httpClient *http.HttpClient) *Service {
 	return &Service{
-		Light:         services.BuildService[services.Light](conn, ctx),
-		HomeAssistant: services.BuildService[services.HomeAssistant](conn, ctx),
+		Light:         services.BuildService[services.Light](conn, ctx, httpClient),
+		HomeAssistant: services.BuildService[services.HomeAssistant](conn, ctx, httpClient),
 	}
 }