Connection interval issue between nRF51822 and iOS device

[Anand Ramashetty]

Hi,

Here is the issue details.

I have my application loaded on the nRF51822 controller and it acts as a peripheral. The IOS device acts as a central.

The connection interval set on the nRF is as below.

#define MIN_CONN_INTERVAL 16(20msec) #define MAX_CONN_INTERVAL 60(75msec) #define SLAVE_LATENCY 2 #define CONN_SUP_TIMEOUT 400 (4sec).

The testing scenario is like that.

I have send the command from the ioS device to nRF , nRF send the command to STM32 controller and it got executed with in 3 sec and it send the ack to nRF , inturn nRF passes the ack to iOS device. After receiving the ack from nRF, iOS send the disconnection command to nRF(the whole process happens in 3-4 second). But the connection will be open for a minimum of 10 second as shown in the attached snapshot and then it closes the connection.

can you please let us the reason for this. It consumes more power when in connection state.

Note : If you are not able to receive the snapshot please let me know.

Regards, Anand

[Anand Ramashetty]

Hi Stefan,

I could not able to attach the snapshot . My system is not allowing. Anyway the snapshot just shows the connection established between nRF and iOS device for 10 second interval.

[Stefan Birnir Sverrisson]

Hi Anand

What app are you using on the IOS that shows the 10 second connection? If you use IOS nRFToolbox HRM app together with the ble_app_hrs example on the peripheral you can see that the peripheral disconnects immediately and starts advertising.

[Anand Ramashetty]

Hi Stefan,

We have developed our own iOS app to communicate with nRF. Anyway I have tested the nRF application with the IOS-nRF_Toolbox_master UART app, there also it is taking minimum 10 second to diconnect.

[Anand Ramashetty]

Hi Stefan,

Can you please send me the mail ID of yours , i will send you the snapshot.

Regards, Anand

[Anand Ramashetty]

Hi Stefan, We have this issue from past 1 month, can you please let me know what could be the issue. Is it on iOS side or nRF side?

Regards, Anand