Linux/CC2650: SPP Client and Server Issue

Jake Beavers

Part Number: CC2650

Tool/software: Linux

I am wanting to connect my CC2650 board to my raspberry pi (running raspbian), using either the SPP Client or Server example.

I can connect a serial connection terminal on my phone to the Server example, i can also connect it to the Raspberry Pi. I cannot connect the Raspberry Pi to the Server however.

When i run SPP Client from it it wont connect at all, even when i enter a custom bd_address into the autoconnect function (i put in the raspberry pi bluetooth mac address, i have also tried it with my phone), i have set it to manual mode too however it doesnt find any devices in the area which is impossible as i tried this in a univeristy building and my own phone discovered hundreds of devices.

On my Pi i run rfcomms and listen on hci0, when the phone connects it detects it and i can oopen a serial connection, but this doesnt happen when i connect the SPP Server app, i can connect it via bluetoothctl in the same way i do the phone (it even pairs) however then nothing happens.

I can see using hcitool that the cc2650 is coming up as a master device, could this be the issue? i have tried switching the role using ""hcitool sr 05:04:03:02:01:00 slave"" however it doesnt allow it. could i change this to slave in the code?

All i want is a serial connection over bluetooth from the cc2650 to the Pi.

over 6 years ago

0 Jake Beavers over 6 years ago

Intellectual 280 points

What i have been doing

I start by look for SPP, mine was on channel 1 with RFCOMM.

-sudo sdptool browse local

I have also tried: -sdptool add SP, just in case

Then i connect to the device

-bluetoothctl

-power on

-agent on

-default-agent

-scan on

-scan off

-pair 05:04:03:02:01:00

-enter passkey

-trust 05:04:03:02:01:00

Then i bind to rfcomms

Sudo rfcomm bind 0 05:04:03:02:01:00 1

Rfcomm #i check that its made and it is there

At this point Rfcomm listen on channel 1 just keeps waiting for connection and i cant connect a terminal (putty, screen or picocom) to /dev/rfcomm0.

Can anyone help please? is this an issue with the code i used for the board, should i use some other example?

0 Marie H over 6 years ago in reply to Jake Beavers

TI__Guru* 82751 points

Hi Jake,

I am not sure exactly what version of the SPP example you are using, but most of the versions filter scanning results. Can you check the source code ( spp_ble_client.c ) whether scan results are filtered? E.g., this code snippet is from the CC26x2 2.10 SDK version of the project:

    case SBC_EVT_ADV_REPORT:
    {
      GapScan_Evt_AdvRpt_t* pAdvRpt = (GapScan_Evt_AdvRpt_t*) (pMsg->pData);

#if (DEFAULT_DEV_DISC_BY_SVC_UUID == TRUE)
      if (SPPBLEClient_findSvcUuid(SERIALPORTSERVICE_SERV_UUID,
                                    pAdvRpt->pData, pAdvRpt->dataLen))
      {
        SPPBLEClient_addScanInfo(pAdvRpt->addr, pAdvRpt->addrType);
        Display_printf(dispHandle, SBC_ROW_NON_CONN, 0, "Discovered: %s",
                       Util_convertBdAddr2Str(pAdvRpt->addr));
      }
#else // !DEFAULT_DEV_DISC_BY_SVC_UUID
      Display_printf(dispHandle, SBC_ROW_NON_CONN, 0, "Discovered: %s",
                     Util_convertBdAddr2Str(pAdvRpt->addr));
#endif // DEFAULT_DEV_DISC_BY_SVC_UUID

      if (pAdvRpt->pData != NULL)
      {
        ICall_free(pAdvRpt->pData);
      }
      ICall_free(pAdvRpt);

      break;
    }

What you see is that if the DEFAULT_DEV_DISC_BY_SVC_UUID define is set (which it is by default), all advertisement packets are filtered to see if they contain the SERIALPORTSERVICE_SERV_UUID as part of the advertisement data. If this UUID is not found, the device is not added to the scanResults list.

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Linux/CC2650: SPP Client and Server Issue