Connection between NRF51 and Android smartphone

[jb1]

Hello I want to establish the connection between nrf51822(base station) and:

• the second nrf51822(transceiver)
• android smartphone(transceiver) It has to be possible without reflashing the base station. It uses NUS service. Base station is central node and the transceiver is peripheral. Actually I managed to do the first part (connection between 2x nrf51822. I read the Bluetooth MAC from the transceiver and save it in the base station. The base station looks for advertising devices and checks their MACs. But I have a problem with the second situation(smartphone with android). The MAC address changes periodically. I read that it is a private address and I have to use IRK to decrypt the original MAC address. But I don't know how to do this because at the same time it has to be possible to connect to the nrf51822 with static MAC address and to smartphone. I hope You will help me to solve this problem. Greetings

[jb1]

I've found this tutorial: devzone.nordicsemi.com/.../ It describes how to use device manager to pair and bond two devices. If I will use it it will implement IRK too for Android BLE? And do I have to implement it in base station and in the transceiver(nrf51822 version) too?

[FormerMember]

The device manager is our legacy module for handling bonding of devices. Instead, I would recommend you to use the "Peer Manager" module, how to use it is described on infocenter.nordicsemi.com.

[jb1]

Thank You for reply. I will use peer manager as You recommend. But I don't understand how it should work. It has to work both with smartphone and NRF51 module. And how can I initiate pairing and bonding on NRF51 device which doesn't have any buttons. Maybe could You tell me more about Peer Manager.

[FormerMember]

To make your device initiate bonding, you can for example set up your device to initiate bonding immediately after a connection has been established, upon the event BLE_GAP_EVT_CONNECTED. For how to initiate bonding from the peripheral, I would recommend you to take a look at this message sequence chart.

The example ble_app_gls in the SDK does for instance use peer manager to handle bonding.

This video tutorial, part 2 (code walkthrough), gives you an introduction to peer manager.