ble_app_att_mtu_throughput, there is no write characteristic

[toru148]

Hi, I am working with ble_app_att_mtu_throughput sample for finding out max transfer speed on BLE4.2. I also need to write central part of this sample on iOS.

I try to find write characteristic on this sample. But I only see these code.

char_props.notify = 1;

char_props.read = 1;

Do you know this sample has a characteristic for writing with Data Length Extension?

[Susheel Nuguru]

We are using notifications to transfer data. You can choose to write instead, so you can enable the write characteristic on this example.

[toru148]

I cannot find API call to use notification for large transfer in the sample code. I only see sd_ble_gattc_write() and sd_ble_gatts_value_set(). Do you know which API can transfer large data by notification?

[toru148]

I found sd_ble_gatts_hvx() is the API for large transfer. Central is keep calling this API inside of while loop. But I cannot find same kind of API in iOS CoreBluetooth. Do you know any API in CoreBluetooth?

[Susheel Nuguru]

Yes, we use sd_ble_gatts_hvx() for notifications to transfer data. Not sure what is the equivalent on CoreBluetooth.