[Redmi note 4] bond list problem

[CFF.K]

Hi, 

My customer issue problem on his redmi note4 of mobile.

Step1: The customer used mobile to bond the peripheral of nRF52. And then the nRF52 device add the bond of Bluetooth list on the mobile.

Step2: The customer turned off Bluetooth of mobile.

Step3: The customer turned on Bluetooth of mobile. However, the peripheral of nRF52 auto remove out from the bond of Bluetooth list.

I try to modify peripheral profile or service. I modify to mouse and keyboard, but the result of the test is same after I operate above step.

What's wrong with the mobile? 

How could I modify my peripheral setting?

[Sigurd]

Hi,

Step3: The customer turned on Bluetooth of mobile. However, the peripheral of nRF52 auto remove out from the bond of Bluetooth list.

Are you saying that the phone removed the bond? And that the nRF52 device is no longer in the list of bonded devices on the phone?

[CFF.K]

Hi, my customer told me that the problem was solved after he updated Andriod os.

I tried the same way that was solved today. But I still have a problem need your suggestion.

This version of Andriod that will change connect interval after the central to discovery services. 

1. Where do I set "Peripheral Preferred connection parameters characteristic" in SDK v14.2.0 ? (I think this setting to change connect interval )

2. Because of some customers response connection is unstable. How to analysis efficiently this connect problem which is the phone or nrf52 ?

[Sigurd]

Hi,

1) You can set it in main.c, by changing the values called MIN_CONN_INTERVAL and MAX_CONN_INTERVAL

2)  If the link disconnets, then looking at the disconnect reason could be a starting point. It could also be useful do a sniffer trace. See this link.