ble_conn_params_att_mtu_set()

uint32_t ble_conn_params_att_mtu_set	(	uint16_t	conn_handle,
		uint16_t	att_mtu )

#include <ble_conn_params.h>

Initiate an ATT MTU exchange procedure for a given connection.

The minimum supported ATT MTU value is 23 (connection's default). The maximum supported ATT MTU value is the minimum of CONFIG_NRF_SDH_BLE_GATT_MAX_MTU_SIZE and 65535.

The SoftDevice needs to be configured to support non-default ATT MTU values by setting CONFIG_NRF_SDH_BLE_GATT_MAX_MTU_SIZE to the maximum ATT MTU value the device shall support.

The ATT MTU exchange procedure is executed asynchronously, and its completion is signalled by the BLE_CONN_PARAMS_EVT_ATT_MTU_UPDATED event.

Parameters

conn_handle	Handle to the connection.
att_mtu	Desired ATT MTU.

Return values

NRF_SUCCESS	On success.
NRF_ERROR_INVALID_PARAM	Invalid ATT MTU or connection handle.