undefined reference to bt_gatt_exchange_mtu on nRF Connect SDK v1.6.1

[Carl Sun]

Hello, 

I am compiling my BLE project on nRF5340, with  nRF Connect SDK v1.6.1. I got this error: undefined reference to bt_gatt_exchange_mtu.

My code works fine on SDK v1.4.1, so how can I solve this problem on v1.6.1? Is bt_gatt_exchange_mtu changed the name on v1.6.1?

Here is my code:

ble_connected(struct bt_conn * conn, uint8_t err)
{
  if( err )
  {
    printk("BLE connection failed (err 0x%02x)\n", err);
  }
  else
  {
    printk("BLE connected\n");

    ble_connection = conn;

    exchange_params.func = exchange_func;

    bt_gatt_exchange_mtu(ble_connection, &exchange_params);
  }
}

Thanks,

Carl

[Sigurd]

Hi,

Is bt_gatt_exchange_mtu changed the name on v1.6.1?

I don't see any name changes.

Try to add this to the top of your file:

#include <bluetooth/gatt.h>

If that does not work, try adding this to prj.conf

CONFIG_BT_GATT_CLIENT=y

[Carl Sun]

Thanks, it works now.