the extension of MTU length

RE: the extension of MTU length

alex kim — Wed, 31 Oct 2018 01:10:43 GMT

Hi, Stain

I solved it

Best regards,

RE: the extension of MTU length

Stian Røed Hafskjold — Tue, 30 Oct 2018 14:56:49 GMT

Hi, did you solve the problem?

RE: the extension of MTU length

alex kim — Fri, 26 Oct 2018 07:33:47 GMT

I knew the cause of the problem.

There was no gatt event processing inside the function 
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
   ......
    nrf_ble_gatt_on_ble_evt(&m_gatt, p_ble_evt);
    .....
}

RE: the extension of MTU length

alex kim — Fri, 26 Oct 2018 02:30:25 GMT

Hi, Philip

Thank you for your reply.

I try err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, 0x20);

but MTU length did not increase and gatt_evt_handler() did not be called

In sdk_config.h

- #define NRF_BLE_GATT_ENABLED 1

#define NRF_BLE_GATT_MAX_MTU_SIZE 244

In ble_nus.h

#define BLE_NUS_MAX_DATA_LEN (NRF_BLE_GATT_MAX_MTU_SIZE - 3)

Best regards,

RE: the extension of MTU length

Philip — Thu, 25 Oct 2018 08:25:03 GMT

Hi. Are you trying to set the MTU to 64 in this line?

err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, 100);

If so are you trying to enter it in binary i.e. b'00000100' = 64?

You normally edit the MTU size in the sdk_config.h file