Disconnection right after connection established on nRF52805 using nRF Connect (BlueN

[Saar]

I am using Fanstel evaluation board with BT805 attached.

I got an example project  - ble to uart.

I was able to build the project with Segger V5.42 (any later verisons could not succeed).

I am able to run the code on the device.

But, when i am trying to connect to the device using the nRF Connect application it disconnects immediatly after connection established.

I cannot see any logs on the nRF output.

I can see that the reason is 0x3E.

Logs from nRF connect:

nRF Connect, 2025-01-24
BlueNor 52805 (FC:1C:FC:7C:42:C6)
D 15:47:31.186 gatt.close()
D 15:47:31.190 wait(200)
V 15:47:31.392 Connecting to FC:1C:FC:7C:42:C6...
D 15:47:31.392 gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D 15:47:31.645 [Callback] Connection state changed with status: 133 and new state: DISCONNECTED (0)
E 15:47:31.645 Error 133 (0x85): GATT ERROR
I 15:47:31.645 Disconnected

Any ideas?

Thanks!

[Saar]

Thanks a lot for the reply,

I tried this as well and many other things but nothing worked.

Eventually I re-ctreated the project from an example project, applied all changes to meet my board (BlueNor BC805) and that did the trick.

Saar.

[Simonr]

Glad to hear you were able to get it up and running. If you need some sort of closure or root cause here, I'd recommend comparing the working and non working projects to see what the exact differences are. If not, I think we can close this ticket.

Best regards,

Simon