CYW20819 SWITCH_ROLE

[ToKo_4602001]

I'd like to perform master slave switch when establishing a connection.

I cannot find the API for this function for now.  can I have the information about how to perform this?

[AnjanaM_61]

Hi ToKo_4602001​ ,

Can you please confirm if you are using BLE or BT classic?

If BT classic which profile?

Regards,

Anjana

[ToKo_4602001]

I use SPP and iAP profile on classic Bluetooth.

For example, I want to connect to a peer device as master and after that I want to change role to slave.

Thanks

[AnjanaM_61]

Hi ToKo_4602001 ,

You may try the API BTM_SwitchRole to switch role. Please add the API as extern in your application code as below:

#define ROLE_MASTER 0

#define ROLE_SLAVE 1

typedef uint8_t tBTM_STATUS;

extern tBTM_STATUS BTM_GetRole (BD_ADDR remote_bd_addr, uint8_t *p_role, tBT_TRANSPORT transport);

extern tBTM_STATUS BTM_SwitchRole (BD_ADDR remote_bd_addr, UINT8 new_role, wiced_bt_dev_cmpl_cback_t *p_cb);

Example:

1. btm_status = BTM_GetRole (p_data->open.bdaddr, &role, BT_TRANSPORT_BR_EDR);

  WICED_BT_TRACE( "GetRole status:%d role:%d\n", btm_status, role ); // 0:Master, 1:Slave

2. btm_status = BTM_SwitchRole( p_data->open.bdaddr, ROLE_MASTER, BTMRoleSwitchHandler);

void BTMRoleSwitchHandler(void *role_switch_data)

{

  tBTM_BL_ROLE_CHG_DATA *p_event_data = (tBTM_BL_ROLE_CHG_DATA *)role_switch_data;

  uint8_t status = p_event_data->hci_status;

  UINT8 new_role = p_event_data->new_role;

  WICED_BT_TRACE( %B status %d new_role %d \n", p_event_data->rem_bda, status, new_role );

}

The API's will be added in future SDK releases.

Regards,

Anjana

[ToKo_4602001]

Thank you for your response.

I tried but unfortunately I got the following results.

    undefined reference to `BTM_SwitchRole'

    error: ld returned 1 exit status

I assume that the definition in "wiced_btsdk\dev-kit\baselib\20819A1\internal\20819A1\patches\patch.sym" is also required.

  BTM_SetLocalDeviceName = 0x024493;

  BTM_ReadLocalDeviceName = 0x0244b9;

  BTM_SwitchRole = XXXXXXXXXXX

Regards,

[AnjanaM_61]

Hi ToKo_4602001 ,

Let me check internally if this API is not available for CYW20819 or not and update you.

Regards,

Anjana

[AnjanaM_61 · Accepted solution]

Hi ToKo_4602001 ,

Currently these APIs are not included in SDK for CYW20819.

Our software team is working on this to fix in next BTSDK releases.

Sorry for the inconvenience caused.

Regards,

Anjana

[ToKo_4602001]

I get it.

Thank you for your confirmation.

Regards,