Daren bms updated firmware YP01-16S200JC26-V1.0.2_T1

[pwbpease]

Checklist

• I have filled out the template to the best of my ability.
• I have understood that this integration is only about battery management systems with Bluetooth Low Energy support.
• This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
• I followed the instructions for devices that are not recognized.
• I have checked out the latest release.

Please describe the enhancement you would like to have.

I just received a replacement Bluetooth dongle for one of my Daren bms’. The new dongle required an update to the Daren bms firmware and now while it connects just fine to the new dongle, some of the values are incorrect. The other 2 dongles are working correctly.

This is from the new dongle

2026-07-31 15:14:34.551 DEBUG (MainThread) [custom_components.bms_ble] DWF781C3CEBB7D5: BMS data update
2026-07-31 15:14:34.552 DEBUG (MainThread) [aiobmsble.bms.jbd_bms] DWF781C3CEBB7D5|B7D6: BMS already connected
2026-07-31 15:14:34.552 DEBUG (MainThread) [aiobmsble.bms.jbd_bms] DWF781C3CEBB7D5|B7D6: TX BLE req #1 (W.): dd a5 03 00 ff fd 77
2026-07-31 15:14:35.172 DEBUG (MainThread) [aiobmsble.bms.jbd_bms] DWF781C3CEBB7D5|B7D6: RX BLE data (start): bytearray(b'\xdd\x03\x00/\x15\x1b\xff\xff\xff\xff\xff\xff\x01\x15\x00\x00\x00\x00\x00\x00\x00\x00\x00c\x07\x10\x04\x0c8\x0c7\x0c=\x0c=\x0c[\x0cqc\x00\x00\x00\x0b\xa7\x0b\xb8\xff\xff\x00\x06\xf3:w')
2026-07-31 15:14:35.172 DEBUG (MainThread) [aiobmsble.bms.jbd_bms] DWF781C3CEBB7D5|B7D6: TX BLE req #1 (W.): dd a5 04 00 ff fc 77
2026-07-31 15:14:35.248 DEBUG (MainThread) [aiobmsble.bms.jbd_bms] DWF781C3CEBB7D5|B7D6: RX BLE data (start): bytearray(b'\xdd\x04\x00 \r\x1d\r8\r:\r<\r:\r;\r9\r9\r7\r5\r/\r,\r+\r!\r&\r&\xfb\xffw')
2026-07-31 15:14:35.254 DEBUG (MainThread) [custom_components.bms_ble] DWF781C3CEBB7D5: BMS data sample {'voltage': 54.03, 'current': -0.01, 'cycle_charge': 655.35, 'design_capacity': 655, 'cycles': 277, 'balancer': 0, 'problem_code': 0, 'battery_level': 99, 'chrg_mosfet': True, 'dischrg_mosfet': True, 'temp_sensors': 4, 'temp_values': [39.7, 39.6, 40.2, 40.2], 'cell_voltages': [3.357, 3.384, 3.386, 3.388, 3.386, 3.387, 3.385, 3.385, 3.383, 3.381, 3.375, 3.372, 3.371, 3.361, 3.366, 3.366], 'delta_voltage': 0.031, 'cell_count': 16, 'cycle_capacity': 35408.56, 'power': -0.54, 'battery_charging': False, 'runtime': 235926000, 'temperature': 39.925, 'problem': False}
2026-07-31 15:14:35.256 DEBUG (MainThread) [custom_components.bms_ble] Finished fetching DWF781C3CEBB7D5 data in 0.705 seconds (success: True)

Some things are right like voltage, but current is wrong.
Here is the data from one of the older dongles at the same time. The values should be almost identical except cycles as they are on the same Busbar.

2026-07-31 15:14:31.081 DEBUG (MainThread) [custom_components.bms_ble] DWF3C8A1F7C1235: BMS data sample {'voltage': 54.0, 'current': 2.84, 'cycle_charge': 324.08, 'design_capacity': 324, 'cycles': 191, 'balancer': 0, 'problem_code': 0, 'battery_level': 99, 'chrg_mosfet': True, 'dischrg_mosfet': True, 'temp_sensors': 4, 'temp_values': [37.6, 38.0, 37.9, 38.3], 'cell_voltages': [3.373, 3.375, 3.376, 3.376, 3.376, 3.375, 3.376, 3.375, 3.373, 3.375, 3.376, 3.377, 3.38, 3.374, 3.375, 3.373], 'delta_voltage': 0.007, 'cell_count': 16, 'cycle_capacity': 17500.32, 'power': 153.36, 'battery_charging': True, 'temperature': 37.95, 'problem': False}

Additional context

No response

[pwbpease]

Green are correct, red is not.

[patman15]

Hi!
Can you please

• Provide the advertisement data of the devices working and the one not working so I can identify them. (Go to the advertisement monitor, click the device in question, and provide the information via copy to clipboard, i.e. JSON format).
• Information on what the correct current and stored energy was at that time?

EDIT: Sorry, overlooked it, you provided the second info already.

[pwbpease]

Working with correct data
{"name":"DWF3C8A1F7C1235","address":"3C:8A:1F:7C:12:36","rssi":-85,"manufacturer_data":{},"service_data":{},"service_uuids":["0000ff00-0000-1000-8000-00805f9b34fb"],"source":"F4:4E:FC:12:AB:CF","connectable":true,"time":1785673458.841695,"tx_power":-21,"raw":"020106020aeb030300ff1009445746334338413146374331323335"}

Working with incorrect data
{"name":"DWF781C3CEBB7D5","address":"78:1C:3C:EB:B7:D6","rssi":-88,"manufacturer_data":{},"service_data":{},"service_uuids":["0000ff00-0000-1000-8000-00805f9b34fb"],"source":"F4:4E:FC:12:AB:CF","connectable":true,"time":1785663651.1719,"tx_power":-21,"raw":"020106020aeb030300ff1009445746373831433343454242374435020106020aeb030300ff"}

[patman15]

Hmm, that doesn't look too promising, as the delta is just the MAC address. 😞

Can you please install the branch linked to this issue (see column on the right under development) via manual install. Then I would need a debug log of both devices (please reload the integration after enabling the debug log). Maybe the BMS version number is different in order to distinguish them correctly.

[pwbpease]

Strange with dev branch now not connecting

This error originated from a custom integration.

Logger: custom_components.bms_ble
Source: helpers/update_coordinator.py:364
Integration: BLE Battery Management System (documentation, issues)
First occurred: 1:15:16 PM (1 occurrence)
Last logged: 1:15:16 PM

Unexpected error fetching DWF781C3CEBB7D5 data
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 364, in __wrap_async_setup
await self._async_setup()
File "/config/custom_components/bms_ble/coordinator.py", line 114, in _async_setup
bms_info: Final = await self._device.device_info()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/aiobmsble/basebms.py", line 201, in device_info
await self._connect()
File "/usr/local/lib/python3.14/site-packages/aiobmsble/basebms.py", line 342, in _connect
await self._init_connection()
File "/usr/local/lib/python3.14/site-packages/aiobmsble/bms/jbd_bms.py", line 167, in _init_connection
await super()._init_connection(char_notify)
File "/usr/local/lib/python3.14/site-packages/aiobmsble/basebms.py", line 302, in _init_connection
await self._client.start_notify(
char_notify or self.uuid_rx(), getattr(self, "_notification_handler")
)
File "/usr/local/lib/python3.14/site-packages/bleak/init.py", line 904, in start_notify
await self._backend.start_notify(
characteristic, wrapped_callback, bluez=bluez, cb=cb, **kwargs
)
File "/usr/local/lib/python3.14/site-packages/bleak/backends/bluezdbus/client.py", line 988, in start_notify
assert_gatt_reply(reply, start_notify=True)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/bleak/backends/bluezdbus/utils.py", line 108, in assert_gatt_reply
raise BleakGATTProtocolError(
BleakGATTProtocolErrorCode(int(match.group(1), 16))
)
bleak.exc.BleakGATTProtocolError: (<BleakGATTProtocolErrorCode.UNLIKELY_ERROR: 14>, 'GATT Protocol Error: Unlikely Error')

[pwbpease]

Then I reinstall 2.15 and it connects

[patman15]

Strange with dev branch now not connecting

I do not see a reason for a problem, I would guess it was a transient error. Can you retry and send me a debug log?

[pwbpease]

home-assistant_bms_ble_2026-08-03T16-08-45.485Z.log

[patman15]

The log shows that the signal strength is really bad. That explains why you have troubles connecting. Try to improve the connection to the battery.

[pwbpease]

Moved HA into same room as devices. Less than 10ft away from each other with no obstructions between them. Same thing. Beta 2.16 fails to connect. I switch back to 2.15 2 minutes later and it connects right away…..attached see photos and latest debug

home-assistant_bms_ble_2026-08-05T13-07-35.562Z.log

[patman15]

Oh, cool, that revealed a bug. Thanks! I updated, can you try again?

[pwbpease]

Nothing changed in bms_ble-ha#779 that I can see. So no change on my side - it’s not connecting. Looks like the bug is in aiomobile? What do you want me to update?On Aug 6, 2026, at 2:52 AM, Patrick ***@***.***> wrote:patman15 left a comment (patman15/BMS_BLE-HA#779) Oh, cool, that revealed a bug. Thanks! I updated, can you try again? —Reply to this email directly, view it on GitHub, or unsubscribe.Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS and Android. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[patman15]

@pwbpease did you reboot and try again? I updated the library and it should be automatically installed when you reboot.

[pwbpease]

Let me redownload #779 and install it again and reboot…

Still not connecting with #779.