CC2652RB: How to trigger a disconnection as a peripheral?

Chris Hunt

Part Number: CC2652RB
Other Parts Discussed in Thread: CC2541

CC2652RB, project is based on SimplePeripheral example, using SDK 4.20.01.04.

How do I force a Bluetooth disconnection? We used to have a project that used the CC2541, and that SDK had a GAPRole_TerminateConnection() function we could call. I was looking for something similar for the CC2652RB. I found a GAP_TerminateLinkReq(), but it requires connectionHandle and reason parameters that I'd have to track down the values for. Is that what I should be using, or what's the best way to gracefully initiate a disconnection from the peripheral side?

over 5 years ago

0 YiKai Chen over 5 years ago

Guru 735705 points

Yes, GAP_TerminateLinkReq is the correct API to terminate connection.

0 Luis M over 5 years ago

TI__Expert 5345 points

Chris,

YK Chen is correct. Please see the migration guide.

-Luis

0 Chris Hunt over 5 years ago in reply to Luis M

Intellectual 945 points

I tried calling GAP_TerminateLinkReq(LINKDB_CONNHANDLE_ALL, LL_HOST_REQUESTED_TERM); but the connection persists. Is there some other setup required?

0 Jan over 5 years ago in reply to Chris Hunt

TI__Mastermind 44770 points

Hi Chris,

I believe that should be the correct API call. I recommend looking at the Bluetooth Low Energy Connections SLA lab. The lab cover how to use GAP API to modify the connection. The lab specifically covers how to update the connection parameters from the peripheral side, but the process for causing a disconnect from the peripheral side is very similar. Let us know if you run into any issues.

Regards,

Jan

0 YiKai Chen over 5 years ago in reply to Chris Hunt

Guru 735705 points

Chris Hunt Try the following code

    uint8_t i;
    for(i = 0; i < MAX_NUM_BLE_CONNS; i++)
    {
        //For existing connections, terminate the link.
        if (connList[i].connHandle != 0xFFFF)
        {
            GAP_TerminateLinkReq(connList[i].connHandle, HCI_DISCONNECT_REMOTE_USER_TERM);

            Log_info0("Terminating connection(s).");
        }
    }

0 Chris Hunt over 5 years ago in reply to YiKai Chen

Intellectual 945 points

Your code works, and so does mine if I just change the second parameter:

GAP_TerminateLinkReq(LINKDB_CONNHANDLE_ALL, HCI_DISCONNECT_REMOTE_USER_TERM);

I had assumed what fixed it was using the connection handle individually, but apparently GAP_TerminateLinkReq() doesn't like LL_HOST_REQUESTED_TERM as a parameter. I only found the LL ones when looking originally, and it's not really clear what "host" and "peer" refer to. I assumed since I'm terminating it on my end, that would be the local host, and the other end of the connection would be the peer, but I guess that's not right?

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CC2652RB: How to trigger a disconnection as a peripheral?