immediately Disconnected,reason:0x3e

[daoms]

Hey guys,

I've been troubled by the this 0x3E issue for almost disappointed to Nordic.

I'm working on a CENTRAL,which is going to connect a headphone with to read some information.It is an easy application.

I started from the example ble_app_hrs_c. After I send to CONNECT_REQ, it immediately happened "Disconnected,reason:0x3e".

So I moved to the nRF Connect desktop APP,and it also comes to the same problem.

So

1.What maybe the reason to this BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED?

1.The BLE device is OK,I already tried it on the phone APP (IOS and android). No such problems.

2.Why nRF Connect also cannot handle this issue?It should be a GENERAL tool,right?

Thanks very much.

[Mttrinh]

Hi,

BLE_HCI_CONN_FAILED_TO_BE_ESTABLISHED means connection failed to be established. Does this error appear everytime?

When you say phone app, you mean nRF Connect on the phone?

[daoms]

Yes,it happens almost every time.Very ocasionally,it is able to make the connetion.

Use nRF Connect on the phone is always OK.

I sniffer the packets and found that after CONNECT_REQ,the central indeed sent other 6 EMPTY PDUs to the headphone,but the headphone doesn't respond.

From the sniff track,I found that the only difference is WINDOW SIZE and WINDOWS OFFSET,on my central window offset is 0ms ,while the phone APP has 2.5ms windows offser. Does this matter?