Pairing(bonding) data communication PROBLEM

[sjheo]

Hi, every developers,

I am testing the example of ble_app_hrs_c and ble_app_hrs using 2 nRF52840 (in SDK 15.3.0 VERSION).

My goal is that data communication with two DK in pairing state. The data to be sent is not a heart rate or a battery level but a string or byte data sequence.

I have chosen two examples that support bonding via pm_manager, but I am having difficulty using the function to send and receive data.

I tried to use pm_peer_data_load () and pm_peer_data_store () functions, but calling both functions will cause a connection security error.

ERROR : <info> peer_manager_handler: Connection security failed: role: Central, conn_handle: 0x0, procedure: Encryption, error: 4102

I declare the function PEER_ID and function usage of two functions as follows.

pm_peer_id_t p_peer_id;

ret_code_t error_code = pm_peer_id_get(m_conn_handle,&p_peer_id);

pm_store_token_t * p_token;
void const * p_data;
p_data = "TESTING";

pm_peer_data_store(p_peer_id,PM_PEER_DATA_ID_BONDING,p_data, 20, p_token);

Could someone help me with the proper use of the two functions or with the function to send and receive data in the BONDING state?

Thank you.

[sjheo]

Hi, Simon. Your kind answer was helpful to me.

I checked the ble_app_blinky example and modified the function you mentioned.

Now, I can data communication with paired two modules.

But, I knew through the modification than the maximum data length with sd_ble_gatts_hvx function is 20 byte.. I am a little sad because I need to send more data at once for my project.

Thanks for your help and I'll make more changes for me!

[Simon]

Take a look at this ticket:

https://devzone.nordicsemi.com/f/nordic-q-a/47930/uart-ble-example---data-size-limit

Best regards,

Simon