Hello @anhnhancao ,
Sorry I am late. Not sure if you already fixed this. Let me explain the usage
- On your Peripheral , you can set the MTU size by modifying config file as you already know. For example,
.gatt_cfg = /* GATT configuration */
{
.appearance = APPEARANCE_GENERIC_TAG, /**< GATT appearance (see gatt_appearance_e) */
.client_max_links = 2, /**< Client config: maximum number of servers that local client can connect to */
.server_max_links = 1, /**< Server config: maximum number of remote clients connections allowed by the local */
.max_attr_len = 244,
.max_mtu_size = 247
},
- By default a BLE connection will use MTU size of 23. If you have to use a higher value their either of the two devices should send MTU exchange request. Then the negotiated MTU value (smallest among both) will be used for further communication.
- In your application if Central device is capable of sending a mtu exchange request, then that is good enough. You need not have to call wiced_bt_gatt_configure_mtu API again in Cypress Peripheral BT device.
In the other case , if you want to initiate this from cypress BT side, then use the API wiced_bt_gatt_configure_mtu. Inorder to use this API , in config file you should have entered a non zero value for .client_max_links under .gatt_cfg
Please try this method and let us know if you face any issues.
Regards,
Anjana
