"Insufficient Encryption" Failure notice as write response?

[saparimuthup]

Hi Technical Team,

nRF52832DK is running on central role with the below 

SDK version : 12.3
IDE :IAR

It is working (connection,just work pairing,bonding, & reading/writing the characteristics) with the peripheral BLE device and the device is disconnected.
In order to reading/writing the characteristics again, we have re-connected the bonded device and writing data with this API (sd_ble_gattc_write) but we are getting
write response "Insufficient Encryption".

What will be the problem?
is there any procedure to re-connect the device? or having any example code?

As we are not familiar with BLE communication, please give some detailed explanation?

[Jared]

Hi

Example code for writing to a characteristics is found at : https://github.com/bjornspockeli/custom_ble_service_example

The example sets up a custom service that enables writing to a characteristic value. The handling of write events from the softdevice is also shown in the tutorial. 

Jared