• State Not Answered
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 3824 views
  • Users 0 members are here
Attachments (0)
Nordic Case Info
  • Case ID: 122160
Options
This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

Question about setting ATT MTU size in S132 v4

Daniel

Hello,

I find that some examples such as ble_app_uart uses a GATT_MAX_MTU_SIZE of 158, and it has initialization in function ble_stack_init().

// Configure the maximum ATT MTU.
memset(&ble_cfg, 0x00, sizeof(ble_cfg));
ble_cfg.conn_cfg.conn_cfg_tag                 = CONN_CFG_TAG;
ble_cfg.conn_cfg.params.gatt_conn_cfg.att_mtu = NRF_BLE_GATT_MAX_MTU_SIZE;
err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATT, &ble_cfg, ram_start);
APP_ERROR_CHECK(err_code);

// Configure the maximum event length.
memset(&ble_cfg, 0x00, sizeof(ble_cfg));
ble_cfg.conn_cfg.conn_cfg_tag                     = CONN_CFG_TAG;
ble_cfg.conn_cfg.params.gap_conn_cfg.event_length = 320;
ble_cfg.conn_cfg.params.gap_conn_cfg.conn_count   = BLE_GAP_CONN_COUNT_DEFAULT;
err_code = sd_ble_cfg_set(BLE_CONN_CFG_GAP, &ble_cfg, ram_start);
APP_ERROR_CHECK(err_code);

But if I want to change GATT_MAX_MTU_SIZE in the ble_app_template project, do we have tutorials to show the steps? I tried to add the configuration in ble_stack_init() function but program doesn't run.

Related