Am making a project based on NUS central demo and I can connect to our remote unit with the 52840DK, I can send data over a UART into it and I can get data out which is received on the remote BLE node.
I'd like to, well, need to, change the TX and RX characteristics to be 240 bytes in size.
I have seen here:
devzone.nordicsemi.com/.../extends-the-mtu-size-in-latest-zephyr
Someone talking about the maximum overall size (although I don't understand what he's saying in the answer).
Where are these used? ie What file would this be in?
CONFIG_BT_BUF_ACL_RX_SIZE instead of CONFIG_BT_L2CAP_RX_MTU (comes from l2cap.h,
#define BT_L2CAP_RX_MTU (CONFIG_BT_BUF_ACL_RX_SIZE - BT_L2CAP_HDR_SIZE)And this:
Max payload size of adv_data with extended advertizement
I'd expect to see it in this:
/* UART Service Declaration */BT_GATT_SERVICE_DEFINE(nus_svc,BT_GATT_PRIMARY_SERVICE(BT_UUID_NUS_SERVICE), BT_GATT_CHARACTERISTIC(BT_UUID_NUS_TX, BT_GATT_CHRC_NOTIFY,#ifdef CONFIG_BT_NUS_AUTHEN BT_GATT_PERM_READ_AUTHEN,#else BT_GATT_PERM_READ,#endif /* CONFIG_BT_NUS_AUTHEN */ NULL, NULL, NULL), BT_GATT_CCC(nus_ccc_cfg_changed,#ifdef CONFIG_BT_NUS_AUTHEN BT_GATT_PERM_READ_AUTHEN | BT_GATT_PERM_WRITE_AUTHEN),#else BT_GATT_PERM_READ | BT_GATT_PERM_WRITE),#endif /* CONFIG_BT_NUS_AUTHEN */ BT_GATT_CHARACTERISTIC(BT_UUID_NUS_RX, BT_GATT_CHRC_WRITE | BT_GATT_CHRC_WRITE_WITHOUT_RESP,#ifdef CONFIG_BT_NUS_AUTHEN BT_GATT_PERM_READ_AUTHEN | BT_GATT_PERM_WRITE_AUTHEN,#else BT_GATT_PERM_READ | BT_GATT_PERM_WRITE,#endif /* CONFIG_BT_NUS_AUTHEN */ NULL, on_receive, NULL),);In good old SES we had what seems logical to me in this:
attr_char_value.max_len = TX_LEN;
err_code = sd_ble_gatts_characteristic_add( exlrt_service.service_handle,
&char_md,
&attr_char_value,
handle );So what's the equivalent with Zephyr please? And do I have to add something to the proj file to say what the max allowable size is?
