Discovery: skip decryption of broadcast message with UDP command (#95)

* Fix climates platform definitions

* Skip decryption of broadcast messages with UDP command

* Should fix discovering 3.1 devices.

custom_components/localtuya/core/tuya_devices/climates.py

@@ -80,7 +80,7 @@ def localtuya_climate(
                 values_precsion=0.1,
                 target_precision=0.1,
             ),
-        )
+        ),
     ),
     # Heater
     # https://developer.tuya.com/en/docs/iot/f?id=K9gf46epy4j82
@@ -98,7 +98,7 @@ def localtuya_climate(
                 target_precision=0.1,
                 preset_set="auto/smart",
             ),
-        )
+        ),
     ),
     # Heater
     # https://developer.tuya.com/en/docs/iot/categoryrs?id=Kaiuz0nfferyx

custom_components/localtuya/discovery.py

@@ -23,6 +23,7 @@
 
 PREFIX_55AA_BIN = b"\x00\x00U\xaa"
 PREFIX_6699_BIN = b"\x00\x00\x66\x99"
+UDP_COMMAND = b"\x00\x00\x00\x00"
 
 DEFAULT_TIMEOUT = 6.0
 
@@ -37,7 +38,10 @@ def _unpad(data):
 def decrypt_udp(message):
     """Decrypt encrypted UDP broadcasts."""
     if message[:4] == PREFIX_55AA_BIN:
-        return decrypt(message[20:-8], UDP_KEY)
+        payload = message[20:-8]
+        if message[8:12] == UDP_COMMAND:
+            return payload
+        return decrypt(payload, UDP_KEY)
     if message[:4] == PREFIX_6699_BIN:
         unpacked = pytuya.unpack_message(message, hmac_key=UDP_KEY, no_retcode=None)
         payload = unpacked.payload.decode()