ble_peripheral3.ino

    void onConnect(BLEServer* pServer, esp_ble_gatts_cb_param_t* param) {
        esp_ble_conn_update_params_t conn_params = {0};
        memcpy(conn_params.bda, param->connect.remote_bda, sizeof(esp_bd_addr_t));
        conn_params.latency = 0;
        conn_params.max_int = 0x20;    // max_int = 0x20*1.25ms = 40ms
        conn_params.min_int = 0x10;    // min_int = 0x10*1.25ms = 20ms
        conn_params.timeout = 400;     // timeout = 400*10ms = 4000ms
        //start sent the update connection parameters to the peer device.
        esp_ble_gap_update_conn_params(&conn_params);
    };