diff --git a/srnemqtt/constants.py b/srnemqtt/constants.py
index 2a13eac..a68bb5c 100644
--- a/srnemqtt/constants.py
+++ b/srnemqtt/constants.py
@@ -5,7 +5,7 @@ MAC = "DC:0D:30:9C:61:BA"
 # read_service  = "0000fff0-0000-1000-8000-00805f9b34fb"
 
 ACTION_READ = 0x03
-ACTION_WRITE = 0x03
+ACTION_WRITE = 0x06
 
 POSSIBLE_MARKER = (0x01, 0xFD, 0xFE, 0xFF)