[BLE] Keep paired devices in memory


I added below my callback function when I connect with my phone to the my custom Tracker SoM-based app. My device OS is 4.0.0. I am using a custom version of Tracker Edge.

I would like all BLE transactions to be encrypted, hence at each connection to the Tracker SoM I launch a pairing procedure if not done yet.

What I would expect is:

  • First connection from phone, pairing request, user needs to click on Accept.
  • Disconnect the BLE device
  • Reconnect, device is already paired, no new pairing request needed.

What I see is that when I reconnect, the logs says again that an unpaired device connected and the BLE goes unresponsive for ~30s. Then it says BLE disconnected and if then I try again to connect, I got a brand new pairing request.

Why is the paired device not kept in the Tracker SoM memory? Is there any way to avoid those 30s disconnection period?

I also see that if I force the deletion of the pairing information on my phone between two connections, then it works fine.

void cb_BLE_connected (const BlePeerDevice& peer, void* context) 
    Loglib.info("BLE device connected");
    if (BLE.isPaired(peer) == false) {
        Loglib.info("An unpaired device just connected!");
        if (BLE.startPairing(peer) != SYSTEM_ERROR_NONE) {
            Loglib.error ("Couldn't launch pairing with device");
        } else {
            Loglib.info ("Device pairing successful!");
    } else {
        Loglib.info("Already paired device connected");

Side question: Is there a way to do bonding instead of pairing? I see that the question was already asked here but there never was any reply: Bluetooth Paired Argon Works Only Once - #5 by Colleen.

Best regards,

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