Pairing(bonding) data communication PROBLEM

RE: Pairing(bonding) data communication PROBLEM

Simon — Fri, 02 Aug 2019 13:29:16 GMT

Take a look at this ticket:

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

Best regards,

Simon

RE: Pairing(bonding) data communication PROBLEM

sjheo — Fri, 02 Aug 2019 08:37:17 GMT

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!

RE: Pairing(bonding) data communication PROBLEM

Simon — Fri, 02 Aug 2019 00:44:16 GMT

The functions pm_peer_data_load() and pm_peer_data_store() are not use to send/receive data between the devices (central and peripheral). The functions are used to store information in flash memory, like bonding information, GATT data and address resolution.

In order to send data from a server (e.g. ble_app_hrs) to a client (e.g. ble_app_hrs_c) over BLE, you have to notify the data (attribute value). This can be done by using the function sd_ble_gatts_hvx() in ble_gatts.h

In order to send data from a client to a server over BLE, you have to write the data (e.g. a characteristic value). This can be done by using the function sd_ble_gattc_write() in ble_gattc.h.

Best regards,

Simon

RE: Pairing(bonding) data communication PROBLEM

sjheo — Thu, 01 Aug 2019 01:34:30 GMT

Hi, Simon

I want the two modules to be paired via the peer manager to send and receive data.

However, the two functions mentioned in the text (pm_peer_data_load and pm_peer_data_store) that update and retrieve the data received from the peer, not related to transport the data.

So, I asked if you know about the functions that send and receive data from the two paired modules.

In the multilink_central example, do I need to send data to paired peers like the lbs(Led Button Service) handler?

Thank you.

RE: Pairing(bonding) data communication PROBLEM

Simon — Thu, 01 Aug 2019 00:47:54 GMT

[quote user="sjheo"]Do you know anything about functions that send and receive data?[/quote]

Could you elaborate more?

Best regards,

Simon

RE: Pairing(bonding) data communication PROBLEM

sjheo — Wed, 31 Jul 2019 00:51:20 GMT

Thank you for your response. Yes, as you say, through nrfjprog --eraseall, the error is gone, so it does.

Do you know anything about functions that send and receive data?

RE: Pairing(bonding) data communication PROBLEM

Simon — Tue, 30 Jul 2019 20:04:49 GMT

The number 4102 (0x1006) indicates that you got the error PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING, which means that encryption failed because the peripheral has lost the LTK for this bond.

Try erasing the flash of both chips through nrfjprog --eraseall, then build, program and run the examples once again. I think this will make the devices able to bond successfully.

Best regards,

Simon