Jannis/ha-xiaoxiang-bms
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Fix BMS not responding to commands

Browse Source 
- Use write_gatt_char with response=True (Write With Response) — many BMS
  firmwares ignore Write Without Response packets
- Add 0.5s delay after start_notify before sending first command to avoid
  race where BMS hasn't registered the notification subscription yet

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Jannis Christiani
2026-04-11 19:43:38 +02:00
parent 78c8a23131
commit 5cee4bd543
1 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
custom_components/xiaoxiang_bms/bluetooth_handler.py
+4 -1
View File
@@ -58,6 +58,9 @@ class BmsBluetoothHandler:
) )
await self._client.connect() await self._client.connect()
await self._client.start_notify(RX_CHAR_UUID, self._on_notify) await self._client.start_notify(RX_CHAR_UUID, self._on_notify)
# Give the BMS a moment to register the notification subscription
# before we start sending commands — avoids dropped first response
await asyncio.sleep(0.5)
_LOGGER.debug("Connected to BMS at %s", self._address) _LOGGER.debug("Connected to BMS at %s", self._address)
async def disconnect(self) -> None: async def disconnect(self) -> None:
@@ -126,7 +129,7 @@ class BmsBluetoothHandler:
self._response_event.clear() self._response_event.clear()
self._response_data = None self._response_data = None
try: try:
await self._client.write_gatt_char(TX_CHAR_UUID, command, response=False) await self._client.write_gatt_char(TX_CHAR_UUID, command, response=True)
except BleakError as exc: except BleakError as exc:
_LOGGER.error("BLE write failed: %s", exc) _LOGGER.error("BLE write failed: %s", exc)
return None return None