Creating an application to send custom commands to the Bluetooth chip on an AOSP build

[Tijo Thomas John]

Hi,

I am trying to create an application (c/cpp) that would allow me to send custom commands to the CSR8510 Bluetooth chip on my development board. I was able to find out from the bluedroid source that the function being used to perform such actions is btu_hcif_send_cmd and that this function is available in the bluetooth.default.so library. I tried linking the bluetooth.default.so library to my application which was using btu_hcif_send_cmd and osi_malloc functions. The code snippet I used is below.

    uint8_t controllerID = LOCAL_BR_EDR_CONTROLLER_ID;

    size_t cmdSize = HCI_CMD_BUF_SIZE;

    cmdPacket = (BT_HDR*)osi_malloc(cmdSize);

     

    cmdPacket->event = 0;

    cmdPacket->offset = 0;

    cmdPacket->layer_specific = 0;

    cmdPacket->len = HCIC_PREAMBLE_SIZE; /*! RESET Command doesn't have any parameters */

    cmdStream = cmdPacket->data;

      

     UINT16_TO_STREAM(cmdStream, HCI_RESET);

     UINT8_TO_STREAM(cmdStream, 0);  /*! RESET Command doesn't have any parameters */     

          btu_hcif_send_cmd(controllerID, cmdPacket);

However, I keep getting the following undefined reference errors when trying to compile the application within the AOSP build.

error: undefined reference to 'osi_malloc(unsigned int)'
error: undefined reference to 'btu_hcif_send_cmd(unsigned char, BT_HDR*)'

Could someone please tell me if I am doing this right and if not, how to do what I want to achieve properly?

Regards,

Tijo