1.1.2.1.2.4.6 GATTC_ExchangeMTURequest

C

uint16_t GATTC_ExchangeMTURequest(uint16_t connHandle, uint16_t mtuLen);

GATT Client sends Exchange MTU Request to GATT Server.

If the requested MTU length is less than BLE_ATT_DEFAULT_MTU_LEN then BLE_ATT_DEFAULT_MTU_LEN is requested.
If the requested MTU length is greater than BLE_ATT_MAX_MTU_LEN then BLE_ATT_MAX_MTU_LEN is requested.

GATTC_EVT_ERROR_RESP Generated when fail to exchange MTU.

ATT_EVT_UPDATE_MTU Generated when MTU exchanges successfully.

ATT_EVT_TIMEOUT Generated when server does not respond the request.


Parameter	Description
[in] connHandle	Handle of the connection to send Exchange MTU Request.
[in] mtuLen	Requested MTU length (Range is BLE_ATT_DEFAULT_MTU_LEN to BLE_ATT_MAX_MTU_LEN, inclusive of both limits)


Return value	Description
MBA_RES_SUCCESS	Successfully starts the Exchange MTU Request.
MBA_RES_FAIL	Operation rejected. This request cannot be performed over BR/EDR link.
MBA_RES_OOM	Internal memory allocation failure.
MBA_RES_INVALID_PARA	Invalid connection handle.
MBA_RES_BUSY	GATT Client is busy. Another request is ongoing.