diff --git a/main.py b/main.py
index 687ea67..34ce2e7 100644
--- a/main.py
+++ b/main.py
@@ -24,13 +24,13 @@ def error_print(message: str):
     print('[ERROR]['+current_time+'] '+message)
 
 #relay
-def relay_controller(pin: int, state):
+def relay_controller(pin: int, state: str):
     print(state)
-    if state == True:
+    if state == "True":
         relay = gpiozero.OutputDevice(pin, active_high=True, initial_value=False)
         relay.on()
         debug_print("Set relay-pin "+str(pin)+" to state True")
-    elif state == False:
+    elif state == "False":
         relay = gpiozero.OutputDevice(pin, active_high=True, initial_value=False)
         relay.off()
         debug_print("Set relay-pin "+str(pin)+" to state False")
@@ -92,24 +92,24 @@ def mqtt_on_message(client, userdata, msg):
 
     if topic == "strawberry-pi-greenhouse/relay/channel/1":
         if payload == "on":
-            relay_controller(channel_1, True)
+            relay_controller(channel_1, "True")
         elif payload == "off":
-            relay_controller(channel_1, False)
+            relay_controller(channel_1, "False")
     elif topic == "strawberry-pi-greenhouse/relay/channel/2":
         if payload == "on":
-            relay_controller(channel_2, True)
+            relay_controller(channel_2, "True")
         elif payload == "off":
-            relay_controller(channel_2, False)
+            relay_controller(channel_2, "False")
     elif topic == "strawberry-pi-greenhouse/relay/channel/3":
         if payload == "on":
-            relay_controller(channel_3, True)
+            relay_controller(channel_3, "True")
         elif payload == "off":
-            relay_controller(channel_3, False)
+            relay_controller(channel_3, "False")
     elif topic == "strawberry-pi-greenhouse/relay/channel/4":
         if payload == "on":
-            relay_controller(channel_4, True)
+            relay_controller(channel_4, "True")
         elif payload == "off":
-            relay_controller(channel_4, False)
+            relay_controller(channel_4, "False")
 
 
 if __name__ == "__main__":