Xiaoxiang / JBD / Overkill BMS Bluetooth Connection

[drageeblue]

Hi,

I have this type of BMS. How can we decode this device datas.

I am sharing my screens and log and debug file from nrf connect app.

Set Parameters:

rf connect logs.zip

And also I installed Thenngs Add-On on my Home Assistant, I can see some Things like below.

[1technophile]

That's great, can you share another set of scrernshots with different values ?

[drageeblue]

You can find as an attachment all logs and mobile app screenshots. But some it has data changes during runtime on mobile apps, not the set parameters.

xiaoxiangBMS_NRFConnectLogsAndMobileAppsScreenshots.zip

[drageeblue]

Is the attachment files enough for your analysis?

[DigiH]

Hi @drageeblue,

unfortunately the device only broadcasts its MAC address in reverse in the manufacturerdata. All the other information you are interested in can only be gotten by actively connecting to the device, which is out of scope of Decoder, as it can only decode freely broadcast messages.

An alternative option for you to try would be the READ functionality of OpenMQTTGateway, with using the services and characteristics from your nRF Connect tests

https://docs.openmqttgateway.com/use/ble.html#read-write-ble-characteristics-over-mqtt-esp32-only

[drageeblue]

Hi DigiH,

I received datas from bms to mqtt->HA via this python code (Sorry for the Turkish object names).

jbdbms-8-mqtt.zip

Reference Link: https://github.com/tgalarneau/bms

[DigiH]

Hi drageeblue,

I'm glad you found a solution which connects to your BMS to get all the relevant data 👍