Lower MAX_PAYLOAD_LENGTH to 1440 and move it to const.py

Author: ostjen

tinytuya/core/const.py

@@ -12,6 +12,12 @@
 TCPTIMEOUT = 0.4    # Seconds to wait for socket open for scanning
 DEFAULT_NETWORK = '192.168.0.0/24'
 
+# Heuristic ceiling used to reject corrupt/desynced streams. Most devices only
+# have ~256 KiB of RAM and need 2x-3x the payload size for buffers, plus packets
+# over ~1440 bytes tend to fragment, so keep the default conservative. Override
+# at runtime if a particular device needs larger frames.
+MAX_PAYLOAD_LENGTH = 1440
+
 # Configuration Files
 CONFIGFILE = 'tinytuya.json'
 DEVICEFILE = 'devices.json'

tinytuya/core/message_helper.py

@@ -10,15 +10,12 @@
 
 from .crypto_helper import AESCipher
 from .exceptions import DecodeError
+from .const import MAX_PAYLOAD_LENGTH
 from . import header as H
 
 log = logging.getLogger(__name__)
 
 
-# Heuristic ceiling to reject corrupt/desynced streams. Large IR learn frames
-# (e.g. air-conditioner codes) exceed 1 KB, so cap generously rather than at 1 KB.
-MAX_PAYLOAD_LENGTH = 65535
-
 # Tuya Packet Format
 TuyaHeader = namedtuple('TuyaHeader', 'prefix seqno cmd length total_length')
 MessagePayload = namedtuple("MessagePayload", "cmd payload")