From cb119294e393c70ff0fc0da5e16435de84215168 Mon Sep 17 00:00:00 2001
From: wenil <i@wenil.ru>
Date: Wed, 22 Jul 2026 01:56:07 +0300
Subject: [PATCH] FD50 GATT fallback patch (vs ShonP40/Tuya-BLE master dabbf9e)

---
 fd50-gatt-fallback.patch | 89 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 fd50-gatt-fallback.patch

diff --git a/fd50-gatt-fallback.patch b/fd50-gatt-fallback.patch
new file mode 100644
index 0000000..07976b1
--- /dev/null
+++ b/fd50-gatt-fallback.patch
@@ -0,0 +1,89 @@
+diff --git a/custom_components/tuya_local_ble/tuya_ble/const.py b/custom_components/tuya_local_ble/tuya_ble/const.py
+index b1514a9..c73f268 100644
+--- a/custom_components/tuya_local_ble/tuya_ble/const.py
++++ b/custom_components/tuya_local_ble/tuya_ble/const.py
+@@ -9,6 +9,12 @@ DEFAULT_ATTEMPTS = 0xFFFF
+ CHARACTERISTIC_NOTIFY = "00002b10-0000-1000-8000-00805f9b34fb"
+ CHARACTERISTIC_WRITE = "00002b11-0000-1000-8000-00805f9b34fb"
+ 
++# Newer TuyaOS firmware (e.g. jtmspro hc7n0urm fw 6.0) drops the legacy
++# 0xA201 service and exposes the data channel via these characteristics
++# of the 0xFD50 service instead.
++CHARACTERISTIC_NOTIFY_FD50 = "00000002-0000-1001-8001-00805f9b07d0"
++CHARACTERISTIC_WRITE_FD50 = "00000001-0000-1001-8001-00805f9b07d0"
++
+ SERVICE_UUID = "0000a201-0000-1000-8000-00805f9b34fb"
+ 
+ MANUFACTURER_DATA_ID = 0x07D0
+diff --git a/custom_components/tuya_local_ble/tuya_ble/tuya_ble.py b/custom_components/tuya_local_ble/tuya_ble/tuya_ble.py
+index 274cbf6..73049eb 100644
+--- a/custom_components/tuya_local_ble/tuya_ble/tuya_ble.py
++++ b/custom_components/tuya_local_ble/tuya_ble/tuya_ble.py
+@@ -24,7 +24,9 @@ from Crypto.Cipher import AES
+ 
+ from .const import (
+     CHARACTERISTIC_NOTIFY,
++    CHARACTERISTIC_NOTIFY_FD50,
+     CHARACTERISTIC_WRITE,
++    CHARACTERISTIC_WRITE_FD50,
+     GATT_MTU,
+     MANUFACTURER_DATA_ID,
+     RESPONSE_WAIT_TIMEOUT,
+@@ -231,6 +233,9 @@ class TuyaBLEDevice:
+         self._current_seq_num = 1
+         self._seq_num_lock = asyncio.Lock()
+ 
++        self._characteristic_notify = CHARACTERISTIC_NOTIFY
++        self._characteristic_write = CHARACTERISTIC_WRITE
++
+         self._is_bound = False
+         self._flags = 0
+         self._protocol_version = 2
+@@ -540,11 +545,25 @@ class TuyaBLEDevice:
+             self._expected_disconnect = True
+             self._client = None
+             if client and client.is_connected:
+-                await client.stop_notify(CHARACTERISTIC_NOTIFY)
++                await client.stop_notify(self._characteristic_notify)
+                 await client.disconnect()
+         async with self._seq_num_lock:
+             self._current_seq_num = 1
+ 
++    def _select_characteristics(self, client: BleakClientWithServiceCache) -> None:
++        """Select the GATT channel actually exposed by the device."""
++        if client.services.get_characteristic(CHARACTERISTIC_NOTIFY):
++            self._characteristic_notify = CHARACTERISTIC_NOTIFY
++            self._characteristic_write = CHARACTERISTIC_WRITE
++        elif client.services.get_characteristic(CHARACTERISTIC_NOTIFY_FD50):
++            _LOGGER.debug(
++                "%s: legacy characteristics not present,"
++                " using FD50 GATT channel",
++                self.address,
++            )
++            self._characteristic_notify = CHARACTERISTIC_NOTIFY_FD50
++            self._characteristic_write = CHARACTERISTIC_WRITE_FD50
++
+     async def _ensure_connected(self) -> None:
+         """Ensure connection to device is established."""
+         global global_connect_lock
+@@ -609,9 +628,10 @@ class TuyaBLEDevice:
+                     _LOGGER.debug("%s: Connected; RSSI: %s",
+                                   self.address, self.rssi)
+                     self._client = client
++                    self._select_characteristics(client)
+                     try:
+                         await self._client.start_notify(
+-                            CHARACTERISTIC_NOTIFY,
++                            self._characteristic_notify,
+                             self._notification_handler,
+                             bluez={"use_start_notify": True},
+                         )
+@@ -968,7 +988,7 @@ class TuyaBLEDevice:
+                 try:
+                     # _LOGGER.debug("%s: Sending packet: %s", self.address, packet.hex())
+                     await self._client.write_gatt_char(
+-                        CHARACTERISTIC_WRITE,
++                        self._characteristic_write,
+                         packet,
+                         False,
+                     )